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GY8S - Virginia Air

1. HIGH EFFICIENCY COMMERCIAL BELT DRIVE SERIES MODELS GY8S160E30UH21 Single Stage Upflow Horizontal 160 MBH INPUT 46 9 kW INPUT Em a ondid k m m 4 _ hc dal 8288 48 d hb RS EM Wwht A E aA e A e 2 3L Z2 UD RM EM AED b LL l T 1 4A w A4 EM 0 St lL A9 Aan ERA F A ON IW UN te eee A4 L EM NEM uw LAO ADM o OW AD LL LM 2 WB MA Em A mM uu A uu ADU A 1 Y A i OM Z7 A M I Y E A M A i A E 4 A 10 o CD CRC AE DCO E A EC 427 I 2 F Oe A WW 9 Ay UU 2L A WM WM A UM L0 M LA Lu LL 3 hl E E L ilL 8 A uM L A ww UU f E L I E L 20 8 0 I 200 WU JS IM A 1 CU UU iQ J EE a I M 1 1 QE CT 3L ACD iC LEN OU Eum eee EM 28 m X Lx LU 0 I LIES iT D uU UAM 8 JJ 1 AW MED qu uM A M L E MM 08 0808 P oM 88 fe uM ME lt A WE EFFICIENCY RATING ama On gt 000 REGIST ISO 9001 Certified Quality Management System LIST OF SECTIONS SAFETY ceteinaatated ab due ees 1 TWINNING AND STAGING
2. es 11 DUCTWORK ele een hh hh nnn 4 VENT SYSTEM een hh nnn 13 FILVERS Ra de he dwan sue ace di dob nae dnos was 7 SAFETY CONTROLS ER a 18 GAS PIPING iine aa duod S4 13 4786 3 Xl EE da ace ues 7 START UP AND ADJUSTMENTS 18 ELECTRICAL POWER XA ORE 8 WIRING DIAGRAM es 25 LIST OF FIGURES DIMENSIONS xus uus adc ere mene mei nd iei tad ds 5 Two Stage Twinning Wiring Diagram 12 Typical Attic Installations nh c chm re rye 6 Vent Termination 10 ft 3 0 m orless 13 Typical Suspended Furnace Crawl Space Installation 6 Vent Termination more than 10 ft 3 0 m 13 Side Return Cutout Markings 7 TEMMMaNON RTT 13 Gas TT 7 Typical Sidewall Vent Application 14 Uptlow Gas PIPING cuiua door eade on eee inden 7 Typical Sidewall Vent and Termination Configuration 14 Horizontal Gas PIPING Ry wm eevee ve vine bea cy 7 HOME LAVOUL UELUT M ae 15 Electrical Wiring 9 Combustion Airflow Path Through The Furnace Casing 16 Electrica
3. 8 m pue oin 39 e Outlet Blower Blower Size Total Unit Hp Amps In em m protection 75 ft one way 230 VAC LILIESERESGU ee 208 280 VAC ONLY TS AND 208 230 VAC SPLIT car 115 VAC ONLY Annual Fuel Utilization Efficiency AFUE numbers are determined in accordance with DOE Test procedures Wire size and over current protection must comply with the National Electrical Code NFPA 70 latest edition and all local codes The furnace shall be installed so that the electrical components are protected from water SUPPLY VOLTAGE CONNECTIONS Blower Motor Circuit IMPORTANT The power connection leads and wiring box may be relo The motor circuit requires 230 volt power supply as shipped This circuit cated to the left side of the furnace Remove the screws and cut wire tie may be changed to 115 volts standard 1 1 2 HP motor only by revising holding excess wiring Reposition on the left side of the furnace and fas the internal motor connections Refer to wiring diagram on the motor Device All field power wiring connections are shown in Figures 10A B amp C 1 Provide a power supply separate from all other circuits Install overcurrent protection and disconnect switch per local national electrical codes The switch should be close to the unit for conve nience in servicing With the disconnect or fused switch in the OFF Remove the 4 x 4 junction box cover plate Route the power wiring throug
4. To separate control circuits use one of the following methods 1 Install an isolation relay between the thermostat and the condens ing unit transformer 2 Use a thermostat equipped with separate R H and R C con tacts NOTE Remove the jumper between these contacts of the thermostat if So equipped Using Isolation Relay Furnace Condensing Thermostat Control Isolation nit Relay 1K Field Wiring Using R H and R C Thermostat Room Furnace Condensing Thermostat Control Unit Remove Jumper If Supplied Field VViring FIGURE 13 Typical Thermostat Wiring with Commercial Condensing Unit This furnace is equipped with a Time On Delay Relay to protect the belt drive motor and start relay if furnace operates 1 under continu ous fan mode or 2 when installing twinning kit Application of twinning kit also requires use of Accessory Sensor Kit ACCESSORY CONNECTIONS The furnace control will allow power switching control of various acces sories Refer to Figure 15 for connection details HUM HOT LK 115 VOLT HUMIDIFIER SWITCHED HUM CIRCUITS FIGURE 14 Accessory Connections Unitary Products Group ELECTRONIC AIR CLEANER CONNECTION Two 1 4 0 64 cm spade terminals EAC and NEUTRAL for electronic air cleaner connections are located on the control board The terminals provide 115 VAC 1 0 amp maximum during circulating blower opera tion HUMIDIFIER CONNE
5. HOLNIA WOIN3A O 831 4I QIWnH OH rer WOH nm 8313IQIWnH O 2v3 Q ova P YOLOWLNOD ua o V 1V3H L T 1002 1V3H 1002 _e L I S310N 33S 150 HOLIMS 4000 1 611 35 09 1 SI1 ATddfS 3M0d MS O N Um 11 jHIVIN3A313 3NWVHOVIQ INVHDVIG WIGGV I iagram D iring W FIGURE 33 25 Unitary Products Group 2 2441 UIM B 0907 NOTES 26 Unitary Products Group 2 2441 UIM B 0907 NOTES Unitary Products Group 27 NOTES Subject to change without notice Printed in U S A 272441 UIM B 0907 Copyright by York International Corp 2007 All rights reserved Supersedes 272441 UIM A 0407 Unitary 5005 Norman Product York OK Group Drive 73069
6. b FIGURE 28 Outside and Ambient Combustion Air When a Category furnace is removed or replaced the original venting system may no longer be correctly sized to properly vent the attached appliances An improperly sized vent system can cause CARBON MONOXIDE to spill into the living space causing personal injury and or death Vent and Supply Outside Air Safety Check Procedure For Category furnaces vent installations shall be in accordance with Parts 7 and 11 of the National Fuel Gas Code ANSI Z223 1 NFPA 54 and or Section 7 and Appendix B of the CSA B149 1 Natural Gas and Propane Installation Codes the local building codes furnace and vent manufacture s instructions Unitary Products Group _ The duct shall be either metal or a material meeting the class 1 requirements of CANA S110 Standard for Air Ducts The duct shall be least the same cross sectional area as the free area of the air supply inlet opening to which it connects The duct shall terminate within 12 in 30 5 cm above and within 24 in 61 cm horizontally from the burner level of the appliance having the largest input V A VENTILATED ATTIC TOP ABOVE INSULATION N LI FURNACE im OUTLET AIR b LI FURNACE um COMBUSTION AIR SOURCE FROM OUTDOORS 1 Two permanent openings one within 12 in 30 5 mm of the top and one within 12 in 30 5 mm of bottom of the confined space Two permanent openings shall communicate direct
7. 5 w c 0 87 kPa 10 0 w c 2 488 kPa OUTLET PRESSURE PORT MAIN REGULATOR PRESSURE ADJUSTMENT PORT ON OFF SWITCH Shown in ON position FIGURE 30 Gas Valve IMPORTANT If gas valve regulator is turned in clockwise manifold pressure is increased If screw is turned out counterclockwise mani fold pressure will decrease 4 After the manifold pressure has been adjusted re calculate the furnace input to make sure you have not exceeded the specified input on the rating plate Refer to CALCULATING THE FURNACE INPUT NATURAL GAS 5 Once the correct BTU kW input has been established turn the gas valve to OFF and turn the electrical supply switch to OFF then remove the flexible tubing from the gas valve pressure tap and tighten the pressure tap plug using the 3 32 2 4 mm Allen wrench 6 Turn the electrical and gas supplies back on and with the burners in operation check for gas leakage around the gas valve pressure port for leakage using an approved non corrosive gas leak detec tion fluid or other non flammable leak detection methods MAINFOLD PRESSURE U TUBE CONNECTION OUTLET PRESSURE aii TAP MANIFOLD ado a PIPE E O 1 4 TUBING IE ez P 3 5 IN WATER COLUMN BURNER GAS SHOWN MANOMETER FIGURE 31 Reading Gas Pressure 21 2 2441 UIM B 0907 BLOWER OPERATION CAUTION Do not energize more than one motor speed at a time or
8. 610 m above sea level The gas orifices on this furnace must be changed in order to maintain proper and safe operation when the furnace is installed in a location where the altitude is greater than 2 000 ft 610 m above sea level on natural gas or the altitude is greater than 4 000 ft 1219 m above sea level on propane LP gas Refer to Table 6 or the instructions in the high altitude conversion kit or ANSI Z223 1 NFPA 54 National Fuel Gas Code or in Canada CAN CGA B149 1 00 Natural Gas and Propane Installation Code for proper orifice size HIGH ALTITUDE PRESSURE SWITCH CONVERSION For installation in locations where the altitude is less than 4 500 feet 1372 it is not required that the pressure switch be changed For altitudes above 4 500 feet 137 m refer to Instructions in the Acces sory High Altitude Kit 6 000 ft 7 000 ft 2134 m 8 000 ft 2438 m 9 000 ft 2743 m 10 000 ft 3048 m PROPANE AND HIGH ALTITUDE CONVERSION KITS It is very important to choose the correct kit and or gas orifices for the altitude and the type of gas for which the furnace is being installed Only use natural gas in furnaces designed for natural gas Only use propane LP gas for furnaces that have been properly converted to use pro pane LP gas Do not use this furnace with butane gas Incorrect gas orifices or a furnace that has been improperly converted will create an extremely dangerous condition resulting in
9. 8 square inches 3 Then take the 384 square inch from the rectangular duct and add it to the 307 8 sq in of round duct The total square inch of duct attached to the furnace supply plenum is 691 8 total square inches This exceeds the recommended 650 square inch of duct In this example the duct system attached to the plenum has a sufficient area so that the furnace operates at the specified external static pres sure and within the air temperature rise specified on the nameplate providing the return duct is properly sized as well in BTUIH RW em dia 2 81 2 cm dia 160 000 46 9 3 500 99 1 840 5 419 28 x 30 71 x 76 32 81 2 650 4195 22 x 26 56 x 66 27 69 NOTE This chart does not replace proper duct sizing calculations or take into account static pressure drop for run length and fittings Maintain proper temperature rise and static pressures 1 Maximum return air velocity in rigid duct 700 feet per minute 213 m min 2 Example return main trunk duct minimum dimensions 3 Maximum supply air velocity in rigid duct 900 feet per minute 274 m min 4 Unitary Products Group TABLE 3 Round Duct Size Calculated Area For Each Round Duct Size 2 Round Duct Size inches cm Sq in cm 19 6 126 38 4 248 50 2 324 63 6 410 78 5 506 95 613 113 1 730 132 7 856 153 9 993 1 The Air Temperature Rise is determined by subtracti
10. Homes must be vented with an approved roof jack and may not be common vented with other appliances 13 2 2441 UIM B 0907 VENTING Category venting consists of vertically venting one or more appliances in B vent or masonry chimney as allowed using single wall metal pipe or B vent connectors Type B vent system extends in a general vertical direction and does not contain offsets exceeding 45 degrees A vent system having not more than one 60 degree offset is permitted The vent system must be attached to the flue collar with a minimum of 2 mechanical fasteners such as screws or rivets See Figure 25 VENTING INTO AN EXISTING CHIMNEY For Category l installations the furnace shall be connected to a factory built chimney or vent complying with a recognized standard or a masonry or concrete chimney lined with a material acceptable to the authority having jurisdiction Venting into an unlined masonry chimney or concrete chimney is prohibited Whenever possible B 1 metal pipe should be used for venting Where use of an existing chimney is unavoidable the following rules must be followed 1 The masonry chimney must be built and installed in accordance with nationally recognized building codes or standards and must be lined with approved fire clay tile flue liners or other approved liner material that will resist corrosion softening or cracking from flue gases THIS FURNACE IS NOT TO BE VENTED INTO AN UNLINED MASONRY CHIMNEY 2 T
11. The formula for metric input calculation using a cubic foot gas meter MJ m x 2 cu ft x 0 028 0 960 3600 _ 7 3412 14 Seconds it took to measure the 2 cu ft of gas NATURAL GAS INPUT CALCULATION EXAMPLE 38 4 x 2 x LA 0 960 x 3600 3412 14 77 796 80 Natural Gas 1030 BTU SCF 38 4 MJ m PROPANE LP GAS INPUT CALCULATION EXAMPLE 93 15 x 1 x AE 0 960 x 3600 Dude x nod 79 093 4 Propane Gas 2500 BTU SCF 93 15 MJ m In Canada use the following formula to calculate the furnace input if you are using a gas meter that measures cubic meters For Natural Gas multiply the Heat content of the gas MJ m or Default 38 4 times 0 10 m of gas measured at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time it took to measure 0 10 m of gas from the gas meter For Propane LP Gas multiply the Heat content of the gas MJ m or Default 93 15 times 0 10 m of gas measured at the gas meter times a baro metric pressure and temperature correction factor of 0 960 times 3600 then divided by the time it took to measure 0 10 m of gas from the gas meter The formula for metric input calculation using a cubic meter gas meter MJ m x m x 0 960 x 3600 Seconds it took to measure the 0 10 m of gas NATURAL GAS INPUT CALCULATION EXAMPLE 38 4 x 0 1 x 0 960 x 3600 160 kW X 3412 14 23 03 X 3412 14 Natural Gas 1030 BTU SCF 38 4 MJ m PROPANE LP GAS IN
12. a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling building or structure served by the side wall horizontal vented gas fuelled equipment It shall be the responsibility of the property owner to secure the services of qualified licensed professionals for the installation of hard wired carbon monoxide detectors a In the event that the side wall horizontally vented gas fuelled equipment is installed in a crawl space or an attic the hard wired carbon monoxide detector with alarm and battery back up may be installed on the next adjacent floor level b In the event that the requirements of this subdivision can not be met at the time of completion of installation the owner shall have a period of thirty 30 days to comply with the above requirements provided however that during said thirty 30 day period a battery operated carbon mon oxide detector with an alarm shall be installed 2 APPROVED CARBON MONOXIDE DETECTORS Each car bon monoxide detector as required in accordance with the above provisions shall comply with NFPA 720 and be ANSI UL 2034 listed and IAS certified 3 SIGNAGE A metal or plastic identification plate shall be perma nently mounted to the exterior of the building at a minimum height of eight 8 feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fuelled heating appliance or equipment The sign sh
13. ance to soot and generate dangerous levels of CARBON MONOX IDE which can lead to serious injury property damage and or death An unconfined space is not less than 50 cu ft 1 42 m per 1 000 Btu hr 0 2928 kW input rating for all of the appliances installed in that area Rooms communicating directly with the space containing the appli ances are considered part of the unconfined space if openings are not furnished with doors A confined space is an area with less than 50 cu ft 1 42 m per 1 000 Btu hr 0 2928 kW input rating for all of the appliances installed in that area The following must be considered to obtain proper air for combus tion and ventilation in confined spaces CHIMNEY OR GAS VENT VENTILATION LOUVERS each end of attic OUTLET AIR LLI lt 2 2 Tu WATER HEATER INLET AIR DUCT ends 1 ft 30 cm above floor p p d DN aS FIGURE 25 Air Inlet Outlet and Chimney Connections 16 Combustion Air Source From Outdoors The blocking effects of louvers grilles and screens must be given con sideration in calculating free area If the free area of a specific louver or grille is not known refer to Table 10 to estimate free area TABLE 10 Estimated Free Area Wood or Metal Louvers or Grilles Wood 20 2595 Metal 60 70 1 4 0 635 cm mesh or larger 10096 Screens not use less than 1 4 mesh Free area or louvers and grille varie
14. every 4 ft 1 22 m 3 Termination should be located where it will not be affected by wind FAN ASSISTED COMBUSTION SYSTEM gusts light snow airborne leaves or allow recirculation of flue This appliance is equipped with an integral mechanical means to draw gases products of combustion through the heat exchanger Unitary Products Group 15 2 2441 UIM B 0907 Ambient Combustion Air Supply This type installation will draw the air required for combustion from within the space surrounding the appliance and from areas or rooms adjacent to the space surrounding the appliance This may be from within the space in a non confined location or it may be brought into the furnace area from outdoors through permanent openings or ducts A properly sized duct from the outside to the furnace location must be pro vided ATTACH VENT PIPE TO FLUE COLLAR JUST ABOVE TOP PANEL WITH TWO SCREWS COMBUSTION AIR FIGURE 24 Combustion Airflow Path Through The Furnace Casing A WARNING This type of installation requires that the supply air to the appli ance s be of a sufficient amount to support all of the appliance s in the area Operation of a mechanical exhaust such as an exhaust fan kitchen ventilation system clothes dryer or fireplace may cre ate conditions requiring special attention to avoid unsatisfactory operation of gas appliances A venting problem or a lack of supply air will result in a hazardous condition which can cause the appli
15. if the normally closed contacts in the rollout switch opens The rollout control is manually reset If it has opened check for proper combustion air proper inducer operation and primary heat exchanger failure or burner problem Be sure to reset the switch and cycle power 24 VAC to the control after correcting the fail ure condition 6 RED FLASHES This indicates that after the unit was operating the pressure switch opened 4 times during the call for heat If the main blower is in a Delay on mode it will complete it and any subsequent delay off period The furnace will lock out for one hour and then restart 7 RED FLASHES This fault code indicates that the flame could not be established This no light condition occurred 3 times 2 retries during the call for heat before locking out Low gas pressure faulty gas valve dirty or faulty flame sensor faulty hot surface ignitor or burner problem may cause this The furnace will lock out for one hour and then restart 8 RED FLASHES This fault is indicated if the flame is lost 5 times 4 recycles during the heating cycle This could be caused by low gas pressure dirty or faulty flame sensor or faulty gas valve The furnace will lock out for one hour and then restart 9 RED FLASHES Indicates reversed line voltage polarity or grounding problem Both heating and cooling operations will be affected Check polarity at furnace and branch Check furnace grounding Check that flame probe is not
16. operates on W2 will be supplying cold air in the Heating mode to the occupied spaces unless W2 is energized Unitary Products Group 272441 UIM B 0907 ELECTRICAL SUPPLY GAS SUPPLY both sides 1 COIL FOR EACH FURNACE RETURN AIR FIGURE 15 Typical Twinned Furnace Application IMPORTANT When two furnaces are twinned typical system total air flow will be approximately 85 of additive individual furnaces i e two 2000 CFM units will yield a total 3400 CFM A CAUTION If a return duct is connected to only one furnace with a connection between the two furnaces an imbalance in the airflow will occur and the furnace furthest from the return plenum will overheat GAS PIPING Furnace gas supplies must be provided as specified with these instruc tions Since the furnaces are side by side with no space between gas supplies must enter on the right and left respectively All gas piping must be in accordance with the national fuel gas code ANSI Z223 1 latest edition and or all local code or utility requirements TWINNING In applications where more heating capacity or more airflow capacity is needed than what one furnace can deliver twinning can be used to make two furnaces operate in tandem using one duct system and one room thermostat When one duct system is used for two furnaces it is necessary that the two blowers operate in unison The twinning function of the board in this furnace ensures t
17. shorted to chassis Unitary Products Group 2 2441 UIM B 0907 10 RED FLASHES Gas flow with no call for heat Check gas valve and gas valve wiring 11 RED FLASHES This indicates that a primary or auxiliary limit switch has opened its normally closed contacts and has remained open for more than five minutes This condition is usually caused by a failed blower motor or blower wheel Cycle power 24 VAC to the control to reset the hard lockout condition after correcting the failure condition 12 RED FLASHES This code indicates an open igniter circuit which could be caused by a disconnected or loose wire or by a cracked or bro ken igniter STEADY ON RED Control failure Replace control board 60 MINUTE AUTOMATIC RESET FROM LOCKOUT This control includes a watchdog type circuit that will reset from a lockout condition after 60 minutes Operational faults 6 7 8 will be reset This provides protection to an unoccupied structure if a temporary condition exists causing a furnace malfunction An example would be a low incoming gas supply pressure preventing unit operation When the gas pressure is restored at some point the watchdog would restart the unit and pro vide heat for the house NOTE If a flame is detected the control flashes the LED for 1 8 of a second and then enters a flame stabilization period IGNITION CONTROL Normal flame sense current is approximately 3 7 microamps DC Low flame signal warning starts at 1 5
18. 0 BTUH 30 kW 1 Foot Above 6 feet 1 83 m 3 feet 91 cm above if within 10 feet 3 m horizontally 12 inches 30 4 cm 12 inches 30 4 cm 12 30 4 cm 12 30 4 cm 12 30 4 cm 12 30 4 cm 1 In accordance with the current CSA B149 1 00 Natural Gas and Propane Installation Code 2 n accordance with the current ANSI Z223 1 NFPA 54 National Gas Code T Avent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings i Permitted only if veranda porch deck or balcony is fully open on a minimum of two sides beneath the floor For clearance not specified in ANSI Z223 1 NFPA 54 or CSA B149 1 00 Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer s Installation Manual Any fresh air or make up inlet for dryer or furnace area is considered to be forced air inlet Avoid areas where condensate drippage may cause problems such as above planters patios or adjacent to windows where steam may cause fogging A terminus of a vent shall be either Fitted with a cap in accordance with the vent manufacturer s installation instructions or In accordance with the installation instructions for a special venting system IMPORTANT Consideration must be given for degradation of building materials by flue gases Sidewall termination may require sealing or shielding of building surfaces with a corrosio
19. 000 130 000 2 000 65 Sq In Horizontal TABLE 12 Unconfined Space Minimum Area in Square Inch Minimum Free Area in Square Feet EXAMPLE Square feet is based on 8 foot ceilings 28 000 BTUH X 50 Cubic Ft 1 400 1 000 BTUH Input Rating 175 Sq Ft 8 Ceiling Height AIR SUPPLY OPENINGS AND DUCTS 1 An opening may be used in lieu of a duct to provide to provide the outside air supply to an appliance unless otherwise permitted by the authority having jurisdiction The opening shall be located within 12 30 5 cm horizontally from F the burner level of the appliance Refer to COMBUSTION AIR SOURCE FROM Pd OUTDOORS and VENT AND SUPPLY AIR SAFETY CHECK in these 2 VENTILATED ATTIC TOP ABOVE instructions for additional information and safety check procedure OUTLET FURNACE VENTILATED CRAWL SPACE 5 A square or rectangular shaped duct shall only be used when the required free area of the supply opening is 9 in 58 06 cm or larger When a square or rectangular duct is used its small dimensionshall not be less than 3 in 7 6 cm An air inlet supply from outdoors shall be equipped with a means to prevent the direct entry of rain and wind Such means shall not reduce the required free area of the air supply opening SOFFIT VENT 7T An air supply inlet opening from the outdoors shall be located not less than 12 30 5 cm above the outside grade level GAS WATER HEATER INLET AIR
20. 2 2 4 mm allen wrench 3 Turn the electrical and gas supplies back on and with the burners in operation check for gas leakage around the gas valve pressure port for leakage using an approved non corrosive gas leak detec tion fluid or other non flammable leak detection methods Read the manifold gas pressure Connect the positive side of the manometer to the OUT P Tap on the gas valve Do not connect any tubing to the negative side of the manometer as it will reference atmospheric pressure Refer to Figure 31 for connection details IMPORTANT The cap for the pressure regulator must be removed entirely to gain access to the adjustment screw Loosening or tightening the cap does not adjust the flow of gas Unitary Products Group 2 2441 UIM B 0907 NOTE The regulated outlet pressure has been calibrated at the fac tory Additional pressure adjustment should not be necessary If adjust ment is necessary set to the following specifications After adjustment check for gas leakage 1 Refer to Figure 31 for location of pressure regulator adjustment cap and adjustment screws on main gas valve 2 Turn gas and electrical supplies on and follow the operating instructions to place the unit back in operation 3 Adjust manifold pressure by adjusting gas valve regulator screw for the appropriate gas per the following TABLE 14 Nominal Manifold Pressure NOMINAL MANIFOLD PRESSURE Natural Gas Propane LP Gas 3
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22. CTION Two 1 4 0 64 cm spade terminals HUM and NEUTRAL for humidi fier connections are located on the control board The terminals provide 115 VAC 1 0 amp maximum during heating system operation SECTION VI TWINNING AND STAGING NOTE You can twin two furnaces that have the same integrated control module Check the part number on the integrated control module You cannot twin two furnaces that have different integrated control module part numbers If the part numbers of the two integrated control modules are different they may not communicate with each other so they will not work in a twinning application In applications where more heating capacity or more airflow capacity is needed than what one furnace can deliver twinning can be used to make two furnaces operate in tandem When two furnaces are installed using the same duct system it is very important that the two furnace cir culating air blowers operate in unison If one blower starts before the second blower the duct system will become pressurized and the blower on the second furnace will turn backwards causing the second furnace to overheat resulting in damage to the furnace Twinning is used to make two furnaces operate in tandem using one duct system one room thermostat and causing both furnaces to turn on and off simulta Before installing the relay and wiring disconnect electrical power to both furnaces Failure to cut power could result in electrical shock or equipm
23. Filters filters and mounting provision must be field supplied Filters s may be located in the duct system external to the furnace or in a return filter grille s Filters s may be located in the duct system using an external duct filter box attached to the furnace return air duct Filters must be a minimum distance of 18 45 7 cm from the furnace The use of straps and or supports is required to support the weight of the external filter box CAUTION All installations must have a filter installed SECTION IV GAS PIPING GAS SAFETY IMPORTANT Plan your gas supply before determining the correct gas pipe entry Use 90 degree service elbow s or short nipples and con ventional 90 degree elbow s to enter through the cabinet access holes Unitary Products Group 2 2441 UIM B 0907 OUTLET PRESSURE PORT VENT PORT INLET gt OUTLET WRENCH BOSS INLET MAIN REGULATOR PRESSURE ADJUSTMENT PORT ON OFF SWITCH Shown in ON position FIGURE 5 Gas Valve An over pressure protection device such as a pressure regulator must be installed in the gas piping system upstream of the furnace and must act to limit the downstream pressure to the gas valve so it does not exceed 0 5 PSI 14 w c 3 48 kPa Pressures exceed ing 0 5 PSI 14 w c 8 48 kPa at the gas valve will cause damage to the gas valve resulting in a fire or explosion or cause damage to the furnace or som
24. IRING 7 8 BOTTOM IMAGE front Cabinet Dimension A Aim 8 Bem Cem o pem Fm Unitary Products Group 2 2441 UIM B 0907 RESIDENTIAL AND MODULAR HOME UPFLOW RETURN PLENUM CONNECTION Return air may enter the furnace through the side s or bottom depend ing on the type of application Return air may not be connected into the rear panel of the unit In order to achieve the airflow indicated it is rec ommended those applications over 1800 57 m3 min use return air from two sides one side and the bottom or bottom only For single return application see data and notes on blower performance data Table 16 in this manual BOTTOM RETURN AND ATTIC INSTALLATIONS Bottom return applications normally pull return air through a base plat form or return air plenum Be sure the return platform structure or return air plenum is suitable to support the weight of the furnace The furnace base is equipped with a rectangular blockoff panel that can be removed by performing the following steps 1 Lay the furnace on its back Remove the screws from the toe plate Remove the toe plate Pull the base plate out of the furnace base Reinstall the toe plate and secure with the screws that were removed Attic installations must meet all minimum clearances to combustibles and have floor support with required service accessibility OF pu Ie IMPORTANT If an external mounted filter rack is being use
25. NY 3 Z 3002 112 YO 1v201 2 YO GNY 232 3002 2313 NYIQVNYO 8 7YO GNY DIN 3002 2313 TVNOIIVN 34 ONINIM 01313 11 1 6 39NY80 J9ONVYO NYO Aud nod 319904 dud 183A N3349 nus nnua nue INV 18 JLIHM LHM dii LOH 3N11 39000 Gi 2v 0 2 902 038 OVASII OL 0318 m 3181183ANO2 3118 1 YOLOW 8108 pe L ONY Y2v18 LOH 310N 33S 3NI 1 39V1I4 NG 40310020 3 3002 SMS ATA 310100 TAIM J3DIAYJS 37 DAAV YAGIIONd 40 INVAV SYNJL NOFSIQ S31 Z3JYANO NOILNY J d LINN SIHL 9NIOIAU3S NOLLNVD XOVNUOM 08 TABRIQ L TAH 3404138 SLOANNODSIG N3dO 8 ONY 1 I S310N 235 SWVYOVIG ONIYIM 013414 1vNOI1dO YOLIVINOD alow E gm r m re pre mix e A E e e Fdo Fo n n zz 2 J m o o IL c S 216 LER I YOLOW tn 21 L ONY 13 dH 2 1 1 S310N 335 09 1 0 2 802 G11 09 1 SI1 09 1 0 2 802 AlddfS 3UIlM Alddf S Wu3MOd AlddfiS u3MOd LVLSOWYFHL 1002 1V3H DNO oo 0 WW 411 151 251 ivan 24 440 1002 vSOH 1509 2509 SOU n AV 138 2 Sv9 olny OT 0 07 4 4 215 Ave LI Iud ASII anru ivi NOI u311N9I
26. ON 3G YNALVINWWOD LHOIY 401 HOLIMS 1 1104 SOU 11090 3102 1N3W31n0H 30 YNFLVINWWOD 2509 3015 LHOIY HOLIMS LNO 1104 250 3Honvo 3102 i1N3W37nON 30 YNILYLNWWOD 1808 3015 1431 HOLIMS LNO 1704 1809 NOISS3ud 30 1 YNFLVLNWNOD ZSI HOLIMS LIWII AYVITIXNY 257 3lvdlONIUd 311WI1 30 YNFLVINWWOD 151 HOLIMS LIWII AYWWIYd 151 32viufS 30 NOILINSI Q Sid Z V 312V1d323H 13 ISIYd S d YOLINOI 32VjNfS LOH LY 137205 ONId Nid Z S d NOILINOI Q 31OH1NOO 30 FLLINOVId v1 NDS Sld v v 3120V1d303H Y ISIYd 2S 2d QuvOS8 1OH1NOO FOWNUNA NO 137205 ONId Nid eS ed NOILINO9I Q0 31081NO2 30 3i13nOvid V YNS Sld 2 V 310V1d303H ASIYd 15 14 QuvOS 1081 2 3OVNu j NO 137205 v 9119 Nid ZI 1 14 JONVHD 32v4unS 30 NOILIINOI NOI 8311INO9I 3OVJUfS LOH NOI 2v9 30 3dVdhOS AD 3A1VA SVO A9 NOLONOKSIQ 30 YNFLVINWWOD SA HOLIMS 123NNOOSIQ 50 10N3931 GNWDWI LHM 10N9 o 039 939 NUD 151 m 251 2 nig NYG LHM n n18 CYOLOW AvV13H YJNIL NO AV130 A lt Z IES YOSNIS id n m lt d d m 2 ZAINA IA c T TI 3A1VA SY9 JLYNYIL1IY po z 2 AW yg 2 118 g n z G 1 14 AW 134 134 QNO i nig ui ro CASI VNun0J3 a 30 31081N02 Dp 081N02 3ovNun4 THM 32v4Hfl LOH LHM 2 y18 LHM 419 mas zn ens S d Us E ERO VAG II z MS O N LHM 0 0 3N11 i nyg TU T x18 OVAGII 1509 vsou 1N
27. PUT CALCULATION EXAMPLE 93 15 x 0 1 x 0 960 x 3600 387 23 10 X 3412 14 8 826 3 Propane Gas 2500 BTU SCF 93 15 MJ m DO NOT ADJUST the manifold pressure regulator if the actual input is equal to or within 896 less than the furnace input specified on the rating plate or if the furnace rise is above the specified rise range on the rating plate If the actual input is significantly higher than the furnace input specified on the rating plate then replace the gas orifices with the gas orifices of the proper size for the type of gas you are using For altitudes above 2 000 ft 610 m the furnace input MUST BE DERATED Refer to the GAS CONVERSION FOR PROPANE LP AND HIGH ALTITUDES IN SECTION IV for information on high altitude conversions 20 Unitary Products Group A CAUTION Be sure to relight any gas appliances that were turned off at the start of this input check ADJ USTMENT OF MANIFOLD GAS PRESSURE Inlet and manifold gas pressure may be measured by connecting the U tube manometer to the gas valve with a piece of tubing Follow the appropriate section in the instructions below Refer to Figure 31 for a drawing of the locations of the pressure ports on the gas valve Turn gas off at the ball valve or gas cock on gas supply line before the gas valve Find the pressure ports on the gas valve marked OUT P and IN P 1 manifold pressure must be taken at the port marked OUT P 2 The gas line pressure mu
28. SYSTEM VENT SAFETY This Category 1 furnace is designed for residential application It may be installed without modification in a basement garage equipment room alcove attic or any other indoor location where all required clear ance to combustibles and other restrictions are met 10 FT 3 0 m OR LESS 2 FT 0 6 m MIN 2 FT 0 6 m MIN WALL OR 4 PARAPET CHIMNEY CHIMNEY 10 FT 3 0 m OR LESS y 2 FT 0 6 m MIN A RIDGE A 3 FT 0 9 m MIN SS FIGURE 18 Vent Termination 10 ft 3 0 or less 10 FT 3 0 OR LESS FROM RIDGE WALL OR PARAPET CHIMNEY MORE THAN 10 FT 3 0 m 3 FT 0 9 m NOTE NO HEIGHT ABOVE e PARAPET REQUIRED L WHEN DISTANCE FROM WALL OR WALLS OR PARAPET IS lt MORE THAN 10 FT 3 0 m PARAPET t CHIMNEY MORE THAN 10 FT 3 0 m la 10 FT 3 0 m 2 FT 0 6 m MIN HEIGHT ABOVE ANY ROOF SURFACE WITHIN 10 FT 3 0 m HORIZONTALLY 3 FT 0 9 m MORE THAN 10 FT 3 0 m FROM RIDGE WALL OR PARAPET CHIMNEY FIGURE 19 Vent Termination more than 10 ft 3 0 m Unitary Products Group 2 2441 UIM B 0907 LOWEST DISCHARGE OPENING LISTED CAP LISTED GAS gt VENT IS x 12 ROOF PITCH H min MINIMUM HEIGHT FROM ROOF TO LOWEST DISCHARGE OPENING FIGURE 20 Vent Termination TABLE 8 Roof Pitch ROOFRHCH m Over
29. able inside the casing to indicate the presence of leaks in the heat exchanger This access cover shall be attached in such a manner as to prevent leaks Residential and Modular Home Horizontal Return Plenum Connections The return duct system must be connected to the furnace inlet and the return duct system must terminate outside the space containing the fur nace Attic installations must meet all minimum clearances to combustibles and have floor support with required service accessibility IMPORTANT If an external mounted filter rack is being used see the instructions provided with that accessory for proper hole cut size 6 ATTIC INSTALLATION SUPPLY AIR BETWEEN LINES FORMED BY THE INTERSECTION OF FURNACE TOP AND TWO SIDES AND BUILDING JOISTS STUDS OR FRAMING VENT Maintain required clearances to combustibles FILTER RACK SHEET METAL MUST BE A MINIMUM IN FRONT OF DISTANCE amp FURNACE COMBUSTION AIR OF 18 45 7 cm OPENINGS IS FROM THE FURNACE RETURN AIR SEDIMENT TRAP FIGURE 2 Typical Attic Installation This appliance is design certified for line contact when the furnace is installed in the horizontal left or right position The line contact is only permissible between lines are formed by the intersection of the top and two sides of the furnace and the building joists studs or framing This line may be in contact with combustible material When a furnace is installed i
30. access Ample clearances should be provided to permit easy access to the unit The following minimum clearances are recommended 1 Twenty four 24 inches 61 cm between the front of the furnace and an adjacent wall or another appliance when access is required for servicing and cleaning 2 Eighteen 18 inches 46 cm at the side where access is required for passage to the front when servicing or for inspection or replacement of flue vent connections In all cases accessibility clearances shall take precedence over clear ances for combustible materials where accessibility clearances are greater Installation in a residential garage 1 A gas fired furnace for installation in a residential garage must be installed so the burner s and the ignition source are located not less than 18 inches 46 cm above the floor and the furnace must be located or protected to avoid physical damage by vehicles 272441 UIM B 0907 TABLE 1 Unit Clearances to Combustibles Application Top Front Rear LeSide Right Side Fue Floor Line Bottom Closet Aicove Contact Ies 1 Line contact only permitted between lines formed by the intersection of the rear panel and side panel top in horizontal position of the furnace jacket and building joists studs or framing SECTION Il DUCTWORK DUCTWORK GENERAL INFORMATION The duct system s design and installation must 1 Handle an air volume appropriate for the served space and with
31. after the selected blower off delay time both blowers will shut off at the same time The twinning control ensures that both blowers come on and shut off at the same time Cooling On a call for cooling Y signal from the wall thermostat both furnace blowers will come on at the same time in cooling speed When the thermostat is satisfied both blowers will stay on for 60 seconds then will shut off at the same time Continuous Fan On a thermostat call for continuous fan G signal both furnace blowers will come on at the same time in cooling speed and will stay on until the G signal is removed FURNACE 1 CONTROL BOARD FURNACE 2 CONTROL BOARD Ow TOK Je JR TWIN v ISOLATION RELAY WALL THERMOSTAT FIGURE 16 Single Stage Twinning Wiring Diagram STAGING In applications where more heating capacity or more airflow capacity is needed than what one furnace can deliver twinning can be used to make two furnaces operate in tandem using one duct system and one room thermostat This control can also be used along with a two stage wall thermostat to stage two twinned furnaces making them operate like a single two stage furnace This allows only one furnace to supply heat during times when the heat output from one furnace is sufficient to satisfy the demand When one duct system is used for two furnaces
32. ak persists replace the component The furnace and its equipment shut off valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1 2 PSI 3 45 kPa CALCULATING THE FURNACE INPUT NATURAL GAS NOTE Burner orifices are sized to provide proper input rate using natu ral gas with a heating value of 1030 BTU Ft 38 4 MJ m If the heat ing value of your gas is significantly different it may be necessary to replace the orifices NOTE Front door of burner box must be secured when checking gas input 1 Turn off all other gas appliances connected to the gas meter 2 At the gas meter measure the time with a stop watch it takes to use 2 cubic ft 0 0566 m of gas 3 Calculate the furnace input by using one of the following equa tions 19 2 2441 UIM B 0907 In the USA use the following formula to calculate the furnace input For natural gas multiply the heat content of the gas BTU SCF or Default 1030 BTU SCF 38 4 MJ m times 2 cubic ft 0 056 m of gas measured at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time In seconds it took to measure 2 cubic ft 0 056 m of gas from the gas meter For propane LP gas multiply the heat content of the gas BTU SCF or Default 2500 BTU SCF 93 15 MJ m times 1 cubic ft 0 028 m of gas mea sured at the gas meter times a bar
33. all Vent and Termination Configuration VENT CLEARANCES IMPORTANT The vent must be installed with the following minimum clearances as shown in Figure 24 and must comply with local codes and requirements TABLE 9 Horizontal Venting Horizontal Vent Length with 4 Elbows Min Vent Length Max Vent Length Pipe Size inches cm Fes meters Unitary Products Group 272441 UIM B 0907 INSIDE CORNER DETAIL V VENT TERMINAL O9 AIR SUPPLY AREA WHERE TERMINAL IS NOT PERMITTED FIGURE 23 Home Layout A Clearance above grade veranda porch deck or balcony 12 inches 30 cm 12 inches 30 cm B inde or door tamar 12 inches 30 cm for models lt 100 000 BTUH 30 kW 4 Feet Below or to Side y P 36 inches 91 cm for models gt 100 000 BTUH 30 kW 1 Foot Above C Clearance to permanently closed window 12 inches 30 cm 12 inches 30 cm D Vertical clearance to ventilated soffit located above the terminal within a horizontal distance 4 Feet 4 Feet of 2 feet 61 cm from the center line of the terminal E Clearance to unventilated soffit 12 Inches 12 Inches 12 Inches 12 Inches feet 91 cm within a height 15 feet 4 5 m above the 3 feet 91 cm within a height 15 feet 4 5 m above the meter regulator assembly meter regulator assembly 3 feet 91 cm 3 feet 91 cm 12 inches 30 cm for models 100 000 BTUH 30 kW 36 inches 91 cm for models gt 100 00
34. all read in print size no less than one half 1 2 inch in size GAS VENT DIRECTLY BELOW KEEP CLEAR OF ALL OBSTRUC TIONS 4 INSPECTION The state or local gas inspector of the side wall horizontally vented gas fuelled equipment shall not approve the installation unless upon inspection the inspector observes car bon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5 08 2 a 1 through 4 Unitary Products Group 2 2441 UIM B 0907 INSPECTION As soon as a unit is received it should be inspected for possible dam age during transit If damage is evident the extent of the damage should be noted on the carrier s freight bill A separate request for inspection by the carrier s agent should be made in writing Before installation the unit should be checked for screws or bolts which may have loosened in transit Also before the initial operation of this fur nace remove shipping strap from the blower housing FURNACE LOCATION AND CLEARANCES The furnace shall be located using the following guidelines 1 Where a minimum amount of vent piping and elbows will be required 2 As centralized with the air distribution as possible 3 Where adequate combustion air will be available particularly when the appliance is not using outdoor combustion air 4 Where it will not interfere with proper air circulation in the confined space 5 Where the outdoor vent terminal will not be blocked or restric
35. als on the integrated control are not used with single speed motors The temperature rise or temper ature difference between the return air and the heated supply air from the furnace must be within the range shown on the furnace rating plate and within the application limitations as shown in Table 7 Unitary Products Group FURNACE CONTROL DIAGNOSTICS The furnace has built in self diagnostic capability If a system problem occurs a blinking LED shows a fault code The LED can flash red green or amber to indicate various conditions It is located behind a clear view port in the blower compartment door The control continuously monitors its own operation and the operation of the system If a failure occurs the LED will indicate the failure code If the failure is internal to the control the light will stay on continuously In this case the entire control should be replaced as the control is not field repairable Flash sequence codes 1 through 11 are as follows LED will turn on for 1 4 second and off for 1 4 second This pattern will be repeated the number of times equal to the code For example six flashes equals a number 6 fault code All flash code sequences are broken by a 2 sec ond off period SLOW GREEN FLASH Normal operation SLOW AMBER FLASH Normal operation with call for heat RAPID RED FLASH Twinning error incorrect 24V phasing Check twinning wiring RAPID AMBER FLASH Flame sense current
36. any appliance not connected to the venting system Turn on any exhaust fans such as range hoods and bath room exhausts so they are operating at maximum speed Do not operate a summer exhaust fan Follow the lighting instructions Place the appliance being inspected into operation Adjust the thermostat so appliance is operating contin uously Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main burner operation Use the flame of a match or candle If improper venting is observed during any of the above tests the venting system must be corrected in accordance with the National Fuel Gas Code ANSI 2223 1 NFPA 54 and or CSA B149 1 Natural Gas and Propane Installation Code After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above return doors windows exhaust fans fireplace dampers and any other gas fired burning appliance to their previous conditions of use SECTION VIII SAFETY CONTROLS CONTROL CIRCUIT FUSE A 3 amp fuse is provided on the control circuit board to protect the 24 volt transformer from overload caused by control circuit wiring errors This is an ATO 3 automotive type fuse and is located on the control board BLOWER DOOR SAFETY SWITCH This unit is equipped with an electrical interlock switch mounted in the blower compartment This switch interrupts all power at the unit when the pan
37. btain airflow difference 3406 3550 144 CFM 4 1 m3 min Subtract the total system static from 0 50 w c 125 Pa and divide this difference by the difference in ESP values in the table 0 60 w c 150 Pa 0 50 w c 125 Pa to obtain a percentage 0 58 0 50 0 60 0 50 0 8 Multiply percentage by airflow difference to obtain airflow reduction 0 8 X 144 115 2 3 28 m min Subtract airflow reduction value to airflow 0 50 w c 125 Pa to obtain actual airflow 0 58 in w c 144 Pa ESP 3550 115 2 3434 8 97 2 m min 0 7 0 174 0 8 0 199 0 9 0 224 1 0 0 249 M m min CFM m min CFM m min CFM m w S m oi One e a bl rem n o X co C1 Oo CO N e C1 co E D C2 co Oj N no no Co O C1 N IS no N C1 N Closed 1 Ope 230 VAC 2 Ope 3 Open 3375 4 Ope Close 1 Ope 208 VAC 2 Ope 3 Ope 4 Ope NOTES kf eek O O S A WwW O NI E N cO en Q2 N 2 N N 1 Airflow expressed in standard cubic feet per minute CFM and in cubic meters per minute m min Operation at these conditions will cause the motor to overload Do not operate the furnace at these conditions Shaded area denotes a condition that may cause excessive
38. crease the blower speed to increase the rise Belt drive blowers have single speed motors Adjusting the blower motor pulley will change the blower speed The blower motor pulley and fan motor pulley are located in the blower compartment Increase the blower speed to decrease the temperature rise decrease the blower speed to increase the rise Blower speed adjustment is made as fol lows 1 Remove the belt and loosen the set screw in the adjustable flange of the motor pulley 2 Close the pulley to decrease the temperature rise open the pulley to increase the rise 3 Position the set screw with one of the flats on the pulley hub and tighten it 4 A Align the fixed flange of the motor pulley with the blower pulley 5 Adjust the belt tension with the motor adjusting bolt until the belt can be depressed 1 with a finger at a point halfway between the two pulleys Loosen the 4 motor mount bolts to permit adjust ment Retighten bolts after adjusting 6 Repeat the pulley adjustment procedure until the desired tempera ture rise is obtained The single speed motor will use the same tap for heating and cooling on the integrated control The heat terminal and the HI cool terminal on the integrated control must be connected using a jumper wire Connect the wire from the indoor fan relay to the jumper on the heat terminal and HI cool terminal on the integrated control Connect the black motor lead to the indoor fan relay The PARK termin
39. d see the instructions provided with that accessory for proper hole cut size HORIZONTAL MODELS 7 n 1 MI i IMPORTANT This furnace may be installed in a horizontal position on either side as shown above It must not be installed on its back Horizontal Installations With a Cooling Coil Cabinet The furnace should be installed with coil cabinet part number specifi cally intended for Horizontal application If a matching cooling coil is used it may be placed directly on the furnace outlet and sealed to pre vent leakage Follow the coil instructions for installing the supply ple num For details of the coil cabinet dimensions and installation requirements refer to the installation instructions supplied with the coil cabinet Horizontal Installations Without a Cooling Coil Cabinet When installing this appliance the furnace must be installed so as to create a closed duct system the supply duct system must be con nected to the furnace outlet and the supply duct system must terminate outside the space containing the furnace When replacing an existing furnace if the existing plenum is not the same size as the new furnace then the existing plenum must be removed and a new plenum installed that is the proper size for the new furnace On all installations without a coil a removable access panel is recom mended in the outlet duct such that smoke or reflected light would be observ
40. damage to the motor will result Adjustment of Fan Control Settings This furnace is equipped with a time on time off heating fan control The fan on delay is fixed at 30 seconds The fan off delay has 4 settings 60 90 120 and 180 seconds The fan off delay is factory set to 120 sec onds The fan off setting must be long enough to adequately cool the furnace but not so long that cold air is blown into the heated space The fan off timing may be adjusted by positioning the jumper on two of the four pins as shown in Figure 33 FAN OFF ADJUSTMENT JUMPER FIGURE 32 Furnace Control Board Continuous Blower Operation The blower will run continuously whenever the wall thermostat fan switch is in the ON position Intermittent Blower Cooling On cooling heating thermostats with a fan switch when the fan switch is set in the auto position and the thermostat calls for cooling a circuit is completed between the Y and terminals The motor is energized through the Y cool terminal and runs continuously until the Y signal is removed and the fan off time has elapsed This fan off setting is fixed at 60 seconds for maximum cooling efficiency furnace control Intermittent Blower Heating On cooling heating thermostats with a fan switch when the fan switch is set in the auto position and the thermostat calls for heating a circuit is completed between the R and W terminals The indoor fan motor is energized through the W heat te
41. e of its components that will result in property damage and loss of life GAS PIPING INSTALLATION Properly sized wrought iron approved flexible or steel pipe must be used when making gas connections to the unit If local codes allow the use of a flexible gas appliance connection always use a new listed con nector Do not use a connector that has previously serviced another gas appliance Some utility companies or local codes require pipe sizes larger than the minimum sizes listed in these instructions and in the codes The furnace rating plate and the instructions in this section specify the type of gas approved for this furnace only use those approved gases The instal lation of a drip leg and ground union is required Refer to Figures 7 and 8 EXTERNAL MANUAL SHUTOFF VALVE N a GROUNDED JOINT UNION MAY BE INSTALLED INSIDE OR OUTSIDE UNIT MANUAL SHUT OFF _ MANUAL SHUT OFF VALVE FIGURE 7 Horizontal Gas Piping 2 2441 UIM B 0907 IMPORTANT An accessible manual shut off valve must be installed upstream of the furnace gas controls and within 6 feet 1 8 m of the fur nace The furnace must be isolated from the gas supply piping system by closing its individual external manual shut off valve during any pressure testing of the gas supply piping system at pressures equal to or greater than 1 2 psig 3 5 kPa CAUTION The gas valve body is a very thin casting that cannot take any external
42. eaner is installed take the return air read ings before the filter box or air cleaner The supply air temperature MUST NEVER exceed the Maximum Outlet Air Temperature specified on the nameplate Operating the furnace above the maximum outlet air temperature will cause the heat exchanger to overheat causing premature heat exchanger failure Improper duct sizing dirty air filters incorrect manifold pressure incorrect gas orifice and or a faulty limit switch can cause the furnace to operate above the maximum supply air temperature Refer to sections Ill and IX for additional informa tion on correcting the problem If a matching cooling coil is used it may be placed directly on the fur nace outlet and sealed to prevent leakage Follow the coil instructions for installing the supply plenum On all installations without a coil a removable access panel is recommended in the outlet duct such that smoke or reflected light would be observable inside the casing to indi cate the presence of leaks in the heat exchanger This access cover shall be attached in such a manner as to prevent leaks D D VENT CONNECTION see note eS POWER WIRING 7 8 HOLE ACCESS WIRING 7 8 K O 4 28 1 2 gt LEFT SIDE VENT CONNECTION vent size see note IMAGE front FIGURE 1 Dimensions TABLE 4 Cabinet and Duct Dimensions BTUH kW 3 Input MBH CFM m min T STAT W
43. el covering the blower compartment is removed Electrical supply to this unit is dependent upon the panel that covers the blower compartment being in place and properly positioned CAUTION Main power to the unit must still be interrupted at the main power disconnect switch before any service or repair work is to be done to the unit Do not rely upon the interlock switch as a main power dis connect Blower and burner must never be operated without the blower panel in place ROLLOUT SWITCH CONTROLS These controls are mounted on the burner assembly If the temperature around the burners exceed the set point the ignition control and the gas valve are de energized The operation of this control indicates a malfunction in the combustion air blower heat exchanger or a blocked vent pipe connection Corrective action is required These are manual reset controls that must be reset before operation can continue PRESSURE SWITCHES This furnace is supplied with two pressure switches which monitor the flow through the combustion air vent piping system This switches de energize the ignition control module and the gas valve if any of the fol lowing conditions are present Refer to Figure 30 for tubing connec tions 1 Blockage of vent piping or terminal 2 Failure of combustion air blower motor 18 FIGURE 29 Pressure Switch Tubing Routing LIMIT CONTROLS There is a high temperature limit control located o
44. ent damage A CAUTION The relay must not be installed in any location where it could be exposed to water If the relay has been exposed to water in any way it must not be used TWINNING DUCT SYSTEM Twinned furnaces must only be applied on a common duct system A single air supply plenum must be used for both furnaces and coil s Separate plenums and supply ducts systems cannot be utilized A sin gle return air plenum common to both furnaces must be used It is sug gested that a return platform be utilized with bottom air entrance into each furnace If a side entrance return system is used the common return duct must be divided equally so as to supply each furnace with an equal amount of return air Both furnaces must be identical models in both heating capacity and CFM capacity Both furnaces must be operated on the same motor speed See typical application Figure 16 If furnace staging is desired with two single stage furnaces on a com mon duct where the gas burner on the first furnace operates on W1 and the gas burner on the second furnace operates on W2 then the use of an air mixing device in the plenum to mix the air from both fur naces is strongly recommended The mixing device must be installed before any ducts that supply air to occupied spaces Twinning causes both indoor fans to operate simultaneously If a mixing device is not used any ducts that are connected down stream from the furnace that
45. enum installed that is of the proper size for the new furnace If the plenum is shorter than 12 30 5 cm the turbulent air flow may cause the limit controls not to operate as designed if at all The duct system is a very important part of the installation If the duct system is improperly sized the furnace will not operate properly The ducts attached to the furnace plenum should be of sufficient size so that the furnace operates at the specified external static pressure and within the air temperature rise specified on the nameplate Table 2 is a guide for determining whether the duct system that the fur nace is being connected to be of sufficient size for proper furnace oper ation Use the Example below to help you in calculating the duct area to deter mine whether the ducts have sufficient area so that the furnace oper ates at the specified external static pressure and within the air temperature rise specified on the nameplate The following are general duct sizing guidelines that may not serve the requirements of every application Example The furnace input is 160 000 BTUH with 3 500 CFM blower requirement The recommended supply duct area is 650 sq in There are two 12 x 16 rectangular ducts and two 14 inch round ducts attached to the plenum 1 12 x 16 which equals 192 sq in X 2 which equals 384 square inches 2 Thesquare inch area for 14 inch round ducts can be found in Table 3 and is 153 9 sq in x 2 307
46. es when the memory has been cleared then will resume the normal slow green flash after a five second pause FILTER PERFORMANCE The airflow capacity data published in Table 16 represent blower perfor mance WITHOUT filters To determine the approximate blower perfor mance of the system apply the filter drop value for the filter being used or select an appropriate value from Table 15 The filter pressure drop values in Table 15 are typical values for the type of filter listed and should only be used as a guideline Actual pres sure drop ratings for each filter type vary between filter manufacturers 23 2 2441 UIM B 0907 TABLE 15 Filter Performance Pressure Drop Inches W C and kPa Filter Type Belt Drive Furnace Bottom Return Pleated High Velocity 4 10 16 cm Thick Fiberglass High Velocity 1 2 54 cm Thick Airflow Range CFM m min 1500 2300 42 5 65 13 2300 2800 65 1 79 29 006 2800 3100 79 29 87 78 0 10 0 249 0 15 Disposable 2 6 08 cm Thick 20187 0 0374 0 50 Washable Fiber 1 2 54 cm Thick 0 0125 0 0249 0 0374 0 0498 0 15 3100 3500 87 78 99 11 0 0498 0 0498 0 0623 0 0498 APPLYING FILTER PRESSURE DROP TO DETERMINE SYSTEM AIRFLOW To determine the approximate airflow of the unit with a filter in place fol low the steps below 1 Select the filter type 2 Select the number of return air openings or calculate the return opening
47. furnace temperature rise Refer to Table 7 or the rating plate for allowable temperature rise range TABLE 17 Field Installed Accessories Non Electrical MODEL NO 1NP0349 DESCRIPTION PROPANE LP CONVERSION KIT 1BR0432 FILTER FRAME KIT BOTTOM 1SR0402 FILTER FRAME KIT SIDE 1PS0301 HIGH ALTITUDE PRESSURE SWITCH 24 Unitary Products Group 272441 UIM B 0907 WIRING DIAGRAM SECTION X 900 V QMn vvvere NOIIINOI GQ 3 081NOD 30 ii1130Ovid YAS 517133 530 S3l12VINOO QuvO8 q1041NO9 NOILINO9I NO SLOWLNOD 4V13U S1I 3UVddV 13 N3l 1NVHO 30 39V 1lj 321A430 ONY ONIUIM 01313 S1i3NVddV 13 3NISN 1 30 39V114 S 321 30 ONY ONINIM A OLOWA U3 INVHO 30 1N3W30NOOOVH O NOILOINNOD 01313 32319 30 LVLSOWYSHL NG 1N3W30HO022VH AV TEESOHHSHE AOOB NOFEJANNOS VAO Hun3WHOJSNVHI 11 VAO H3NHOJSNVHI LI A021 YNFLVINWNDDV YNFLOVLNOD lI 1102 A021 HOE9VLNOJ ul NOISS3Nd 30 YNFLVINWWOD dli HOLIMS 3unSS3Hd dll NO 1V 3O 3Iu310NIN 30 IV138 NOI Avi3H YBNI L NO AVI3Q 301 3Honvo LNVH 1 30 YNFLVLNWWOD SOY 1337 401 HOLIMS LNO 1103 vSOu 11040 LAVH IN3W310
48. h the unit side panel with a conduit connector or other proper connection Make wiring connections as shown in Figures 10 B or C position check all wiring against the unit wiring label Refer to the Replace the wiring box cover plate and secure with screws wiring diagram Figure ii in this FIGURE 10A 2 Remove the screws retaining the junction box cover Route the 115 230 POWER SUPPLY power wiring through the opening in the unit into the junction box TSING S WIRES with a conduit connector or other proper connection In the junc 230 V MOTOR tion box there will be three wires a Black Wire a White Wire and a Green Wire Connect the power supply as shown on the unit wiring label on the inside of the blower compartment door or Figure 10 The black furnace lead must be connected to the L1 hot wire from the power supply The white furnace lead must be connected to neutral Connect the green furnace lead equipment ground to the power supply ground An alternate wiring method is to use a field provided 2 5 1 cm x 4 10 2 cm box and cover on the out side of the furnace Route the furnace leads into the box using a protective bushing where the wires pass through the furnace FIGURE 10B 115 V SINGLE POWER SUPPLY panel After making the wiring connections replace the wiring box 1 1 2 HP MOTOR ONLY cover and screws 3 furnace s control system requires correct polarity of the power supply and a proper ground connection If
49. hat both blowers turn on and off simultaneously and operate on the same blower speed Single Wire Twinning The control in the furnace has the single wire twinning feature With this feature a single wire is connected between the TWIN terminal on one furnace board to the TWIN terminal on the second furnace board The board then communicates the blower status from one furnace to the other along this wire This communication makes the second furnace blower come on at the same time and on the same speed as the first furnace blower Single Wire Twinning Instructions Connect the control wiring as shown in Figure 17 1 Connect the low voltage wiring from the wall thermostat to the ter minal strip on the control board of Furnace 1 2 Connect a wire from the TWIN terminal of Furnace 1 to the TWIN terminal of Furnace 2 3 Install a separate 24V relay as shown in the diagram below Use this relay is required as it ensures that the transformers of the two furnaces are isolated thus preventing the possibility of any safety devices being bypassed 11 2 2441 UIM B 0907 Single Wire Twinning Operation Heating On a call for heat W signal from the wall thermostat both furnaces will start the ignition sequence and the burners on both fur naces will light About thirty seconds after the burners light the blowers on both furnaces will come on in heating speed When the thermostat is satisfied the burners will all shut off and
50. his furnace is not approved for installation in trailers or recre ational vehicles Failure to carefully read and follow all instructions in this manual can result in furnace malfunction death personal injury and or property damage Furnaces for installation combustible flooring shall not be installed directly on carpeting tile or other combustible material other than wood flooring Check the rating plate and power supply to be sure that the elec trical characteristics match DO NOT CONNECT THIS APPLI ANCE TO A 50 HZ POWER SUPPLY See SECTION V for electrical power connections Furnace shall be installed so the electrical components are pro tected from water Installing and servicing heating equipment can be hazardous due to the electrical components and the gas fired components Only trained and qualified personnel should install repair or service gas heating equipment Untrained service personnel can perform basic maintenance functions such as cleaning and replacing the air filters When working on heating equipment observe precau tions in the manuals and on the labels attached to the unit and other safety precautions that may apply These instructions cover minimum requirements and conform to existing national standards and safety codes In some instances these instructions exceed certain local codes and ordinances especially those who have not kept up with changing residential and modular home construction practices These
51. his furnace must be vented into a fire clay tile lined masonry chimney only if a source of dilution air is provided such as by com mon venting with a draft hood equipped water heater If no source of dilution air is available Type B vent must be used or masonry chimney vent kit 1CK0603 or 1CK0604 must be used Refer to the instructions with the kit to properly apply these masonry chimney kits chimney must extend at least 3 ft 0 91 cm above the highest point where it passes through a roof of a building and at least two feet higher than any portion of the building with a horizontal dis tance of ten feet See Figures 19 20 and 21 4 The chimney must extend at least 5 ft 1 5 cm above the highest equipment draft hood or flue collar HORIZONTAL SIDEWALL VENTING For applications where vertical venting is not possible the only approved method of horizontal venting is the use of an auxiliary power vent Approved power venters are Fields Controls Model SWG 4Y or Tjernlund Model GPAK 1T Follow all application and installation details provided by the manufacturer of the power vent Horizontal vent lengths and diameters are provided in Table 9 14 FAN ASSISTED FURNACE amp WATER HEATER FAN ASSISTED FURNACES EXTERIOR OPTIONAL SIDEWALL VENT SYSTEM field supplied HOT WATER TANK VENT PIPE OPTIONAL SIDEWALL VENT SYSTEM field supplied BURNER ACCESS PANEL CELLAR WALL FIGURE 22 Typical Sidew
52. in the operating parameters of the furnace specifications 2 installed in accordance with standards of NFPA National Fire Protection Association as outlined in NFPA pamphlets 90A and 90B latest editions or applicable national provincial or state and local fire and safety codes 3 Create a closed duct system For residential and Modular Home installations when a furnace is installed so that the supply ducts carry air circulated by the furnace to areas outside the space con taining the furnace the return air shall also be handled by a duct s sealed to the furnace casing and terminating outside the space containing the furnace 4 Complete a path for heated or cooled air to circulate through the air conditioning and heating equipment and to and from the condi tioned space A CAUTION The cooling coil must be installed in the supply air duct down stream of the furnace Cooled air may not be passed over the heat exchanger When the furnace is used in conjunction with a cooling coil the coil must be installed parallel with or in the supply air side of the furnace to avoid condensation in the primary heat exchanger When a parallel flow arrangement is used dampers or other means used to control airflow must be adequate to prevent chilled air from entering the furnace If manually operated the damper must be equipped with means to pre vent the furnace or the air conditioner from operating unless the damper is
53. in full heat or cool position The duct system must be properly sized to obtain the correct airflow for the furnace size that is being installed Refer to Table 7 and the furnace rating plate for the correct rise range and static pressures If the ducts are undersized the result will be high duct static pres sures and or high temperature rises which can result in a heat exchanger OVERHEATING CONDITION This condition can result in premature heat exchanger failure which can result in personal injury property damage or death TABLE 2 Minimum Duct Sizing For Proper Airflow DUCTWORK INSTALLATION AND SUPPLY PLENUM CONNECTION A proper heat loss gain calculation should be done on all installations for proper application of equipment From this the ductwork sizing can be calculated ACCA Manual J and D and other industry standards are helpful Attach the supply plenum to the furnace or coil outlet duct connection flanges This is typically through the use of S cleat material when a metal plenum is used The use of an approved flexible duct connector is recommended on all installations to prevent noise transmission All connections should be sealed to prevent air leakage Sheet metal should be cross hatched to eliminate any popping when the indoor fan is energized When replacing an existing furnace if the existing supply plenum is not the same size as the new furnace then the existing plenum must be removed and a new pl
54. ing on near or in contact with the fur nace 1 Spray or aerosol cans rags brooms dust mops vacuum cleaners or other cleaning tools 2 Soap powders bleaches waxes or other cleaning com pounds plastic items or containers gasoline kerosene ciga rette lighter fluid dry cleaning fluids or other volatile fluid 3 Paint thinners and other painting compounds 4 Paper bags boxes or other paper products Never operate the furnace with the blower door removed To do so could result in serious personal injury and or equipment damage FOR FURNACES INSTALLED IN THE COMMON WEALTH OF MASSACHUSETTS ONLY For all side wall horizontally vented gas fuelled equipment installed in every dwelling building or structure used in whole or in part for resi dential purposes including those owned or operated by the Com monwealth and where the side wall exhaust vent termination is less than seven 7 feet above finished grade in the area of the venting including but not limited to decks and porches the following require ments shall be satisfied 1 INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall horizontal vented gas fuelled equipment the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back up is installed on the floor level where the gas equipment is to be installed In addition the installing plumber or gasfitter shall observe that
55. inimum Area in Square Inch 17 Recommended Filter Sizes 7 Inlet Gas Pressure Range 21 High Altitude Conversion 8 Nominal Manifold 21 Electrical amp Performance Data 9 Filter Performance Pressure Drop Inches W C and kPa 24 asc oa bo oe oh ona eae oe oe es 13 Blower Performance CFM Upflow without filter 24 Field Installed Accessories Non Electrical 24 SECTION 1 SAFETY This is a safety alert symbol When you see this symbol on labels or in manuals be alert to the potential for personal injury Understand and pay particular attention to the signal words DANGER WARNING or CAUTION DANGER indicates an imminently hazardous situation which if not avoided will result in death or serious injury WARNING indicates a potentially hazardous situation which if not avoided could result in death or serious injury CAUTION indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury It is also used to alert against unsafe practices and hazards involving only property dam age Improper installation may create a condition where the operation of the product could cause personal injury or property damage Improper installation ad
56. instructions are required as a minimum for a safe installation COMBUSTION AIR QUALITY LIST OF CONTAMINANTS The furnace will require OUTDOOR AIR for combustion when the fur nace is located in any of the following environments Restricted Environments Commercial buildings Buildings with indoor pools Furnaces installed in laundry rooms Furnaces installed in hobby or craft rooms Furnaces installed near chemical storage areas Chemical exposure The furnace will require OUTDOOR AIR for combustion when the fur nace is located in an area where the furnace is being exposed to the fol lowing substances and or chemicals Permanent wave solution s Chlorinated waxes and cleaner s Chlorine based swimming pool chemicals Water softening chemicals De icing salts or chemicals Carbon tetrachloride Halogen type refrigerants Cleaning solvents such as perchloroethylene Printing inks paint removers varnishes etc Hydrochloric acid Cements and glues Anti static fabric softener s for clothes dryers Masonry acid washing materials When outdoor air is used for combustion the combustion air intake duct system termination must be located external to the building and in an area where there will be no exposure to the substances listed above Unitary Products Group The furnace area must not be used as a broom closet or for any other storage purposes as a fire hazard may be created Never store items such as the follow
57. is below 1 5 microamps Check and clean flame sensor Check for proper gas flow Verify that current is greater than 1 5 microamps at flame current test pad 4 AMBER FLASHES The control board is receiving a Y signal from the thermostat without a signal indicating improper thermostat wir ing 1 RED FLASH This indicates that flame was sensed when there was not a call for heat With this fault code the control will turn on both the inducer motor and supply air blower A gas valve that leaks through or is slow closing would typically cause this fault 2 RED FLASHES This indicates that the normally open pressure switch contacts are stuck in the closed position The control confirms these contacts are open at the beginning of each heat cycle This would indicate a faulty pressure switch or mis wiring 3 RED FLASHES This indicates the normally open pressure switch contact did not close after the inducer was energized This could be caused by a number of problems faulty inducer blocked vent pipe bro ken pressure switch hose or faulty pressure switch 4 RED FLASHES This indicates that a primary or auxiliary limit switch has opened its normally closed contacts With this fault code the control will operate the supply air blower and inducer This condition may be caused by dirty filter improperly sized duct system incorrect blower speed setting incorrect firing rate or faulty blower motor 5 RED FLASHES This fault is indicated
58. it is necessary that the two blowers operate in unison The twinning func tion of this board ensures that both blowers turn on and off simulta neously and operate on the same blower speed Even when only one furnace is supplying heat both furnace blowers must run Single Wire Staging The single wire twinning feature of this board can also be used for stag ing of two furnaces With this feature a single wire is connected between the TWIN terminal on one furnace board to the TWIN terminal on the second furnace board The board then communicates the blower status from one furnace to the other along this wire This communica tion makes the second furnace blower come on at the same time and on the same speed as the first furnace blower 12 Single Wire Staging Instructions Connect the control wiring as shown in Figure 18 1 Connect the low voltage wiring from the wall thermostat to the ter minal strip on the control board of Furnace 1 For staging applica tions the wire from thermostat W1 is connected to the W connection on the board on Furnace 1 The wire from thermostat W2 is connected to Furnace 2 through a separate relay as described below 2 Connect a wire from the TWIN terminal of Furnace 1 to the TWIN terminal of Furnace 2 3 Install a separate 24V relay as shown in Figure 18 Use of this relay is required as it ensures that the transformers of the two fur naces are isolated thus preventing the possibility of an
59. justment alteration service or mainte nance can cause injury or property damage Refer to this manual for assistance or for additional information consult a qualified con tractor installer or service agency A CAUTION This product must be installed in strict compliance with the installa tion instructions and any applicable local state and national codes including but not limited to building electrical and mechanical codes 272441 UIM B 0907 2 2441 UIM B 0907 SPECIFIC SAFETY RULES AND PRECAUTIONS l Only Natural gas or Propane LP gas are approved for use with this furnace Refer to the furnace rating plate or SECTION IV of these instructions Install this furnace only in a location and position as specified in SECTION I of these instructions A gas fired furnace for installation in a residential garage must be installed as specified in SECTION I of these instructions Provide adequate combustion and ventilation air to the furnace space as specified in SECTION VII of these instructions Combustion products must be discharged outdoors Connect this furnace to an approved vent system only as specified in SEC TION VI of these instructions FIRE OR EXPLOSION HAZARD Failure to follow the safety warnings exactly could result in serious injury death or property damage Never test for gas leaks with an open flame Use a commercially available soap solution made specifically for detection of lea
60. ks to check all connections A fire or explosion may result causing prop erty damage personal injury or loss of life Test for gas leaks as specified in SECTION IX of these instruc tions Always install the furnace to operate within the furnace s intended temperature rise range Only connect the furnace to a duct system which has an external static pressure within the allowable range as specified on the furnace rating plate When a furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace the return air shall also be handled by duct s sealed to the fur nace casing and terminating outside the space containing the fur nace It is permitted to use the furnace for heating of buildings or struc tures under construction Installation must comply with all manu facturer s installation instructions including Proper vent installation e Furnace operating under thermostatic control Return air duct sealed to the furnace e Air filters in place e Set furnace input rate and temperature rise per rating plate marking Means for providing outdoor air required for combustion Return air temperature maintained between 55 F 13 and 80 F 27 The air filter must be replaced upon substantial completion of the construction process Clean furnace duct work and components upon substantial completion of the construction process and verify f
61. l WINING anc xcd wae cae hae Seta eee eee os eee oe eae 9 Air Inlet Outlet and Chimney Connections 16 Line Wiring Connections 10 Air Inlet Outlet and Chimney Connections 16 Typical Single Stage Thermostat with Single Stage Air Conditioning 10 Alternate Air Intake Air Outlet and Chimney Connections 16 Typical Single Stage Thermostat with Single Stage Heat Pump 10 Outside and Ambient Combustion 17 Typical Thermostat Wiring with Commercial Condensing Unit 10 Pressure Switch Tubing Routing 18 Accessory Connections 10 dS VAG T 21 Typical Twinned Furnace Application 11 Reading Gas Pressure 21 Single Stage Twinning Wiring Diagram 12 Furnace Control Board 22 DIA QUAN MCCC 25 LIST OF TABLES Unit Clearances to 4 Horizontal Venting 14 Minimum Duct Sizing For Proper Airflow 4 Estimated Free 16 Round DUCI OIZE ae mne es Seen Ge 5 PICO Med re 17 Cabinet and Duct Dimensions 5 Unconfined Space M
62. l need a thermometer or portable digital thermometer to read the supply and return air temperatures 3 You will need a U tube manometer or digital equipment that has the ability to read pressures between 0 15 in w c 0 3 73 kPa in order to measure the gas line and the manifold pressures 4 You will need a 3 32 Allen wrench for the pressure port plugs in the gas valve 5 You will need 2 pieces of 1 8 0 3 cm ID flexible tubing that is 12 30 cm in length 2 pieces of 1 8 0 3 cm tubing that are 4 10 0 cm in length a 1 8 0 3 cm tee and a 1 8 0 3 cm adapter to connect the U tube manometer or the digital pressure measur ing equipment to the gas valve pressure ports There is an accessory kit 1PK0601 available from Source 1 which has the following items e 1 12 30 cm length x 1 8 0 3 cm diameter tubing 2 pieces of 4 10 cm length x 1 8 0 3 cm diameter tubing e 1 5 6 0 8 cm tee e 1 5 16 0 8 cm x 1 8 3 175 mm reducing coupling e 1 1 8 0 3 cm adapter There is a accessory kit 1PIK0602 available from Source 1 which has the following items e 12 30 cm length x 1 8 0 3 cm diameter tubing 2 pieces of 4 10 cm length x 1 8 0 3 cm diameter tubing e 1 5 16 0 8 cm tee e 1 5 16 0 8 cm x 1 8 0 3 cm reducing coupling e 1 1 8 0 3 cm adapter 1 Dwyer Manometer These items are required in order to properly perform the required star tup procedu
63. ly or by means of ducts with the outdoors crawl spaces or attic spaces One permanent openings commencing within 12 in 30 5 mm of the top of the enclosure shall be permitted where the equipment has clearances of at least 1 in 2 54 cm from the sides and back and 6 in 15 24 cm from the front of the appliance The opening shall communicate directly with the outdoors and shall have a minimum free area of a 1 square in per 3000 Btu per hour 6 45 cm per 0 879 kW of the total input rating of all equipment located in the enclosure b Notless than the sum of all vent connectors in the confined space The duct shall be least the same cross sectional area as the free area of the air supply inlet opening to which it connects The blocking effects of louvers grilles and screens must be given consideration in calculating free area If the free area of a specific louver aor grille is not known Multi story or common venting systems are permitted and must be installed in accordance with the National Fuel Gas Code ANSI Z223 1 NFPA 54 and or the CSA B149 1 Natural Gas and Propane Installa tion Codes local codes and the manufacture s instructions Vent connectors serving Category furnaces shall not be connected into any portion of mechanical draft systems operating under positive pressure Horizontal portions of the venting system shall be supported to prevent sagging using hangers or perforated straps and must slope upwards n
64. microamps Low flame signal control lockout point is 0 1 microamps DC DIAGNOSTIC FAULT CODE STORAGE AND RETRIEVAL The control in this furnace is equipped with memory that will store up to five error codes to allow a service technician to diagnose problems more easily This memory will be retained even if power to the furnace is lost This feature should only be used by a qualified service tech nician The control stores up to five separate error codes If more than five error codes have occurred since the last reset only the five most recent will be retained The furnace control board has a button labeled LAST ERROR that is used to retrieve error codes This function will only work if there are no active thermostat signals So any call for heating cooling or continuous fan must be terminated before attempting to retrieve error codes To retrieve the error codes push the LAST ERROR button The LED on the control will then flash the error codes that are in memory starting with the most recent There will be a two second pause between each flash code After the error codes have all been displayed the LED will resume the normal slow green flash after a five second pause To repeat the series of error codes push the button again If there are no error codes in memory the LED will flash two green flashes To clear the memory push the LAST ERROR button and hold it for more than five seconds The LED will flash three green flash
65. n an attic or other insulated space keep all insulating materials at least 12 inches 30 5 cm away from furnace and burner combustion air openings SUSPENDED FURNACE CRAWL SPACE INSTALLATION The furnace can be hung from floor hoists or installed on suitable blocks or pad Blocks or pad installations shall provide adequate height to ensure the unit will not be subject to water damage Units may also be suspended from rafters or floor joists using rods pipe angle supports or straps Angle supports should be placed at the supply air end and near the blower deck Do not support at return air end of unit All four sus pension points must be level to ensure quite furnace operation When suspending the furnace use a secure a platform constructed of plywood or other building material secured to the floor joists Refer to Figure 4 for typical crawl space installation SUPPORT ROD 1 MAX BETWEEN ROD amp BACK OF FURNACE 1 MAX BETWEEN zc ROD amp FURNACE 6 MIN BETWEEN ROD amp FRONT OF FURNACE FIGURE 3 Typical Suspended Furnace Crawl Space Installation CAUTION In any application where temperatures below freezing are possible see INSTALLATION IN FREEZING TEMPERATURES IN SEC TION I Unitary Products Group SECTION Ill FILTERS FILTER INSTALLATION All applications require the use of an internal or external filter Filter s and the filter retainer are not provided on all models A field supplied external fil
66. n resistant material to protect against combustion product corrosion Consideration must be given to wind direction in order to prevent flue products and or condensate from being blown against the building surfaces If a metal shield is used it must be a stainless steel material at a minimum dimension of 20 inches It is recommended that a retaining type collar be used that is attached to the building surface to prevent movement of the vent pipe Responsibility for the provision of proper adequate venting and air supply for application shall rest with the installer Vent shall extend high enough above building or a neighboring obstruction so that wind from any direction will not create a positive pressure in the vicinity of the vent HORIZONTAL VENT APPLICATIONS AND 4 Termination should be located where it will not be damaged or TERMINATION exposed to flying stones balls etc When selecting the location for a horizontal combustion air vent termi 5 Termination should be positioned where vent vapors are not objec nation the following should be considered tionable 1 Observe all clearances listed in vent clearances in these instruc 6 Horizontal portions of the vent system must slope upwards and be tions supported to prevent sagging The vent system may be supported 2 Termination should be positioned where vent vapors will not dam gt d ol secured to permanent part of age plants or shrubs or air conditioning equipment structure
67. n the furnace vesti bule panel near the gas valve This is an automatic reset control that provides over temperature protection due to reduced airflow This may be caused by 1 Dirty filter 2 Ifthe indoor fan motor should fail 3 Too many supply or return registers closed or blocked off The control module will lockout if the limit trips 5 consecutive times Control will reset and try again after 1 hour SECTION IX START UP AND ADJ USTMENTS The initial start up of the furnace requires the following additional procedures IMPORTANT All electrical connections made in the field and in the fac tory should be checked for proper tightness When the gas supply is initially connected to the furnace the gas piping may be full of air In order to purge this air it is recommended that the ground union be loosened until the odor of gas is detected When gas is detected immediately retighten the union and check for leaks Allow five minutes for any gas to dissipate before continuing with the start up procedure Be sure proper ventilation is available to dilute and carry away any vented gas Unitary Products Group TOOLS AND INFORMATION THAT WILL BE REQUIRED IN ORDER TO PROPERLY PERFORM THE FURNACE STARTUP PROCEDURE 1 the local gas supplier to obtain heating value of the natural gas If you cannot obtain the heating valve of the gas from the gas supplier you may use a default value of 1030 BTU SCF 38 8 MJ m 2 You wil
68. ng the Return Air Temperature Reading from the Supply Air Temperature Read ing 2 The External Static Pressure is determined by adding the Supply Duct Static Pressure reading to the Return Duct Static Pressure reading and adding the pressure drop across any applied A coil Tables 2 amp 3 are to be used as guides only to help the installer deter mine if the duct sizes are large enough to obtain the proper air flow CFM through the furnace Tables 2 amp 3 ARE NOT to be used to design ductwork for the building where the furnace is being installed There are several variables associated with proper duct sizing that are not included in these tables To properly design the ductwork for the build ing Refer to the ASHRAE Fundamentals Handbook Chapter on DUCT DESIGN or a company that specializes in Residential and Mod ular Home duct designs OPTIONAL SIDE RETURN CUT OUT either side 2 2441 UIM B 0907 IMPORTANT The minimum plenum height is 12 30 5 cm The fur nace will not operate properly on a shorter plenum height The mini mum recommended rectangular duct height is 4 inch 10 cm attached to the plenum IMPORTANT The air temperature rise should be taken only after the furnace has been operating for at least 15 minutes Temperatures and external static pressures should be taken 6 15 cm past the first bend from the furnace in the supply duct and the return duct If an external fil ter box or an electronic air cl
69. ns ing unit unit out side as shown in Figures 12 amp 13 BLK ABLK HOT a NOMINAL WHT AWHT NEUTRAL 120 VOLT GRN GRN Tes FIGURE 10 Line Wiring Connections SINGLE STAGE HEAT PUMP CONTROL SINGLE STAGE SINGLE STAGE PSC THERMOSTAT FURNACE o COIL FIGURE 11 Typical Single Stage Thermostat with Single Stage Air Conditioning SINGLE STAGE HEAT PUMP CONTROL SINGLE STAGE SINGLE STAGE PSC FURNACE THERMOSTAT FIGURE 12 Typical Single Stage Thermostat with Single Stage Heat Pump Set the heat anticipator in the room thermostat as shown below Set ting it lower will cause short cycles Setting it higher will cause the room temperature to exceed the setpoint Single Stage Thermostat 10 IMPORTANT Some electronic thermostats do not have adjustable heat anticipators They may have other type cycle rate adjustments Follow the thermostat manufacturer s instructions The 24 volt 40 VA transformer is sized for the furnace components only and should not be connected to power auxiliary devices such as humidifiers air cleaner s etc The transformer may provide power for an air conditioning unit contactor A CAUTION If the furnace is installed with a condensing unit equipped with its own transformer the condensing unit control circuit must be iso lated from the furnace transformer Refer to Figure 14 for connec tion details
70. ometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time In seconds it took to measure 1 cubic ft 0 028 m of gas from the gas meter The formula for US input calculation using a cubic foot gas meter BTU ft x 2 cu ft x 0 960 x 3600 _ BTU H BTU ft x 1 cu ft x 0 960 x 3600 Seconds it took to measure the 2 cu ft of gas seconds It took to measure the 1 cu ft of gas NATURAL GAS INPUT CALCULATION PROPANE LP GAS INPUT CALCULATION EXAMPLE EXAMPLE 1030 x 2 x 0 960 x 3600 2500 x 1 x 0 960 x 3600 90 5 8 666 90 108 Natural Gas Propane Gas 1030 BTU SCF 2500 BTU SCF 80 000 00 In Canada you will use the following formula to calculate the furnace input if you are using a cubic foot gas meter For Natural Gas multiply the Heat content of the gas MJ m or Default 38 4 times 2 cubic ft of gas x 0 028 to convert from cubic feet to cubic meters measured at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time it took to measure 2 cubic ft 0 056 m of gas from the gas meter For Propane LP Gas multiply the Heat content of the gas MJ m or Default 93 15 times 1 cu ft of gas x 0 028 to convert from cubic feet to cubic meters measured at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time it took to measure 1 cubic ft 0 028 m of gas from the gas meter
71. ot less than 1 4 per foot 0 635 cm m from the furnace to the vent ter minal It is recommended that you follow the venting safety procedure below This procedure is designed to detect an inadequate ventilation system that can cause the appliances in the area to operate improperly causing unsafe levels of Carbon Monoxide or an unsafe condition to occur 17 272441 0907 CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monxide poisoning or death The following steps shall be followed for each appliance connected to the venting system being placed into operation while all other appliances connected to the venting system are not in operation 1 Seal any unused openings in the venting system 2 Inspect the venting system for proper size and horizontal pitch as required in the National Fuel Gas Code ANSI 2223 1 NFPA 54 or the CSA B149 1 Natural Gas and Propane Installation Code and these instructions Determine that there is no blockage or restriction leak age corrosion and other deficiencies which could cause an unsafe condition As far as practical close all building doors and windows and all doors between the space in which the appliance s connected to the vent ing system are located and other spaces of the building Close fireplace dampers Turn on clothes dryers and
72. premature heat exchanger failure excessive sooting high levels of carbon monoxide personal injury property damage a fire hazard and or death High altitude and propane LP conversions are required in order for the appliance to satisfactory meet the application An authorized distributor or dealer must make all gas conversions In Canada a certified conversion station or other qualified agency using factory specified and or approved parts must perform the conversion The installer must take every precaution to insure that the furnace has been converted to the proper gas orifice size when the furnace is installed Do not attempt to drill out any orifices to obtain the proper orifice size Drilling out a gas orifice will cause misalignment of the burner flames causing premature heat exchanger burnout high levels of carbon monoxide excessive sooting a fire hazard personal injury property damage and or death SECTION V ELECTRICAL POWER Electrical Power Connections Field wiring to the unit must be grounded Electric wires that are field installed shall conform to the temperature limitation of 63 F 85 C rise when installed in accordance with these instructions Refer to Table 7 in these instructions for specific furnace electrical data A CAUTION Use copper conductors only Unitary Products Group 272441 UIM B 0907 TABLE 7 Electrical amp Performance Data Operation MBH MBH iwi s
73. pressure Never apply a pipe wrench to the body of the gas valve when installing piping wrench must be placed on the octag onal hub located on the gas inlet side of the valve Placing a wrench to the body of the gas valve will damage the valve causing improper operation and or the valve to leak Gas piping may be connected from either side of the furnace using any of the gas pipe entry knockouts on both sides of the furnace Refer to Figure 1 dimensions GAS ORIFICE CONVERSION FOR PROPANE LP This furnace is constructed at the factory for natural gas fired operation but may be converted to operate on propane LP gas by using a fac tory supplied LP conversion kit Follow the instructions supplied with the LP kit Refer to Table 6 or the instructions in the propane LP con version kit for the proper gas orifice size TABLE 6 High Altitude Conversion Type Orifice at 2 000 ft Of Gas Sea Level 610 m 3 000 ft 4 000ft 5 000 ft 914 m 1219 m 1524 m 1829 m A WARNING LoNOx furnaces requiring propane LP gas must have the LoNOx screens removed prior to installation and operation See the instructions supplied with the propane conversion kit or the start up procedure at the back of these instructions on proper removal of the NOx screens HIGH ALTITUDE GAS ORIFICE CONVERSION This furnace is constructed at the factory for natural gas fired operation at 0 2 000 ft 0 m
74. re Unitary Products Group 2 2441 UIM B 0907 IGNITION SYSTEM SEQUENCE 1 Turn the gas supply ON at external valve and main gas valve 2 Set the thermostat above room temperature to call for heat 3 System start up will occur as follows a The induced draft blower motor will start and come up to speed Shortly after inducer start up the hot surface igniter will glow for about 17 seconds b After this warm up the ignition module will energize open the main gas valve After flame is established the supply air blower will start in about 30 seconds FIRE OR EXPLOSION HAZARD Failure to follow the safety warnings exactly could result in serious injury death or property damage Never test for gas leaks with an open flame Use a commercially available soap solution made specifically for the detection of leaks to check all connections A fire or explosion may result causing property damage personal injury or loss of life IMPORTANT Burner ignition may not be satisfactory on first startup due to residual air in the gas line or until gas manifold pressure is adjusted The ignition control will make 3 attempts to light before lock ing out With furnace in operation check all of the pipe joints gas valve connec tions and manual valve connections for leakage using an approved gas detector a non corrosive leak detection fluid or other leak detection methods Take appropriate steps to stop any leak If a le
75. rminal and runs continuously until the W signal is removed and the fan off delay has elapsed ADJ USTMENT OF TEMPERATURE RISE The temperature rise or temperature difference between the return air and the supply heated air from the furnace must be within the range shown on the furnace rating plate and within the application limitations shown in Table 7 ELECTRICAL AND PERFORMANCE DATA The supply air temperature cannot exceed the Maximum Supply Air Temperature specified in these instructions and on the fur nace rating plate Under NO circumstances can the furnace be allowed to operate above the Maximum Supply Air Temperature Operating the furnace above the Maximum Supply Air Temperature will cause premature heat exchanger failure high levels of Carbon Monoxide a fire hazard personal injury property damage and or death The temperature rise or temperature difference between the return air and the heated supply air from the furnace must be within the range shown on the furnace rating plate and within the application limitations as shown in Table 7 22 YELLOW MED LOW PARK RED LOW BLACK HI BLUE MED HI After about 20 minutes of operation determine the furnace temperature rise Take readings of both the return air and the heated air in the ducts about six feet 1 83 m from the furnace where they will not be affected by radiant heat Increase the blower speed to decrease the temperature rise de
76. s widely the installer should follow louver or grille manufacturer s instructions Dampers Louvers and Grilles Canada Only 1 The free area of a supply air opening shall be calculated by sub tracting the blockage area of all fixed louvers grilles or screens from the gross area of the opening 2 Apertures in a fixed louver a grille or screen shall have no dimen sion smaller than 0 25 6 4 mm 3 A manually operated damper or manually adjustable louvers are not permitted for use 4 automatically operated damper or automatically adjustable lou vers shall be interlocked so that the main burner cannot operate unless either the damper or the louver is in the fully open position CHIMNEY OR GAS VENT VENTILATION LOUVERS each end of attic INLET AIR DUCT ends 1 ft 30 cm above floor FURNACE WATER HEATER CHIMNEY OR GAS VENT VENTILATION LOUVERS each end of attic OUTLET AIR ALTERNATE AIR INLET FURNACE VENTILATION LOUVERS FOR UNHEATED CRAWL SPACE FIGURE 27 Alternate Air Intake Air Outlet and Chimney Connections Unitary Products Group 272441 UIM B 0907 TABLE 11 Free Area Minimum Free Area Required for Each Opening Horizontal Duct Vertical Duct or Round Duct 2 000 BTUH Pr 4 000 BTUH EXAMPLE Determining Free Area Appliance 1Appliance 2 Total Input 100 000 30 000 130 000 4 000 32 5 Sq In Vertical Appliance 1 Appliance 2 Total Input 100 000 30
77. size in square inches to determine the proper filter pres sure drop 3 Determine the External System Static Pressure ESP without the filter 4 Selecta filter pressure drop from the table based upon the number of return air openings or return air opening size and add to the ESP from Step 3 to determine the total system static 5 If total system static matches a ESP value in the airflow table i e 0 20 w c 50 Pa 0 60 w c 150 Pa etc the system airflow cor responds to the intersection of the ESP column and Model Blower Speed row 6 Ifthe total system static falls between ESP values in the table i e 0 58 w c 144 Pa 0 75 w c 187 Pa etc the static pressure may be rounded to the nearest value in the table determining the airflow using Step 5 or calculate the airflow by using the following example TABLE 16 Blower Performance CFM Upflo 0 3 0 075 without filter 0 4 0 099 0 5 0 124 VOLTAGE 0 6 0 149 Example For a 160 000 BTUH 46 89 kW furnace at 230 VAC witha bottom return opening and operating with the motor pulley 1 turn open it is found that total system static is 0 58 w c To determine the system airflow complete the following steps Obtain the airflow values at 0 50 w c 125 Pa amp 0 60 w c 150 Pa ESP Airflow 0 50 3550 CFM 100 5 m min Airflow 0 60 3406 CFM 96 4 m min Subtract the airflow 0 50 w c 125 Pa from the airflow 0 60 w c 150 Pa to o
78. st be taken at the port marked IN P 3 Using a 3 32 2 4 mm Allen wrench loosen the set screw by turn ing it 1 turn counter clockwise DO NOT REMOVE THE SET SCREW FROM THE PRESSURE PORT Read the inlet gas pressure Connect the positive side of the manometer to the IN P Tap on the gas valve Do not connect any tubing to the negative side of the manometer as it will reterence atmospheric pressure Refer to Figure 32 for connec tion details 1 Turn gas and electrical supplies on and follow the operating instructions to place the unit back in operation TABLE 13 Inlet Gas Pressure Range INLET GAS PRESSURE RANGE Natural Gas Propane iP 8 0 W C 1 99 kPa 13 0 3 24 kPa W C 4 5 W C 1 12 kPa 10 5 W C 2 61 kPa IMPORTANT The inlet gas pressure operating range table specifies what the minimum and maximum gas line pressures must be for the fur nace to operate safely The gas line pressure MUST BE a minimum of e 7 W C 1 74 for Natural Gas e 11 W C 2 74 for Propane LP Gas in order to obtain the BTU input specified on the rating plate and or the nominal manifold pressure specified in these instructions and on the rating plate 2 Once the correct gas inlet pressure has been established see Table 13 turn the gas valve to OFF and turn the electrical supply switch to OFF then remove the flexible tubing from the gas valve pressure tap and tighten the pressure tap plug using the 3 3
79. ted Refer to VENT CLEARANCES located in SECTION VII of these instructions These minimum clearances must be maintained in the installation 6 Where the unit will be installed in a level position with no more than 1 4 0 64 cm slope side to side and front to back Installation in freezing temperatures 1 Furnace shall be installed in an area where ventilation facilities provide for safe limits of ambient temperature under normal oper ating conditions Ambient temperatures may fall below 32 F 0 C providing the flue temperature does not fall below 260 F 127 C at any point in the flue pipe between the furnace and the chimney or a B Vent The flue products will condense in the vent pipe if the flue temperature falls below 260 F 127 C causing the vent pipe to deteriorate rapidly 2 Do not allow return air temperature to be below 55 F 13 C for extended periods To do so may cause condensation to occur in the main heat exchanger leading to premature heat exchanger failure leading to premature heat exchanger failure Improper installation in an ambient below 32 F 0 0 C could create a hazard resulting in damage injury or death 3 f this furnace is installed in an unconditioned space and an extended power failure occurs there will be potential damage to the internal components Following a power failure situation do not operate the unit until inspection and repairs are performed Clearances for
80. ter and filter retainer hardware must be provided if the filter and the filter retainer are not shipped with the furnace Refer to Table 5 for the recommended filter size TABLE 5 Recommended Filter Sizes Side Return Bottom End Return 16 x 25 41 x 63 5 2 16 x 29 2 41 x 74 NOTES 1 Air velocity through throwaway type filters may not exceed 300 feet per minute All velocities over this require the use of high velocity fil ters 2 Air flows above 1800 CFM require either return from two sides or one side plus bottom SIDE RETURN EXTERNAL INSTALLATION Locate and knock out the square corner locators These indicate the size of the cutout to be made in the furnace side panel Refer to Figure 5 FRONT OF FURNACE CORNER MARKINGS FIGURE 4 Side Return Cutout Markings Install the side filter rack following the instructions provided with that accessory If a filter s is provided at another location in the return air system the ductwork may be directly attached to the furnace side panel An accessory filter rack is available for mounting the filter exter nal to the cabinet IMPORTANT Some accessories such as electronic air cleaner s and pleated media may require a larger side opening Follow the instruc tions supplied with that accessory for side opening requirements Do not cut the opening larger than the dimensions shown in Figure 1 HORIZONTAL APPLICATION Horizontal
81. the power supply polar ity is reversed the control board will flash 9 times The furnace will not operate until the polarity is corrected Refer to FURNACE DIAGNOSTICS section of the User s Information Maintenance amp Service Manual provided with this furnace for symptoms of _ reversed power supply polarity BLUE NOTE Internal motor wiring must be changed to 115 v BLK BLK WHT WHT GRN GRN FIGURE 10C SEPARATE 115 V amp 230 V POWER SUPPLIES 115 V CONTROL 230 V MOTOR JUNCTION 115 V CONTROL CIRCUIT 208 230 V MOTOR CIRCUIT TO THERMOSTAT BURNER COMPARTMENT FIGURE 9 Electrical Wiring FIGURE 8 Electrical Wiring Unitary Products Group 9 272441 UIM B 0907 LOW VOLTAGE CONTROL WIRING CONNECTIONS Install the field supplied thermostat by following the instructions that come with the thermostat With the thermostat set in the OFF position and the main electrical source disconnected connect the thermostat wiring from the wiring connections on the thermostat to the terminal strip on the integrated control board as shown in Figure 12 and 13 Electronic thermostats may require the common wire to be connected to the C terminal as shown in Figures 12 amp 13 Apply strain relief to thermostat wires passing through cabinet If air conditioning equipment is installed use thermostat wiring to connect the appropriate terminals on the integrated control board to the appropriate wires on the conde
82. urnace operating conditions including ignition input rate temperature rise and venting according to the manufacturer s instructions 10 When installed in a Approved Modular Home or building con structed on site combustion air shall not be supplied from occu pied spaces The size of the unit should be based on an acceptable heat loss calculation for the structure ACCA Manual J or other approved methods may be used SAFETY REQUIREMENTS This furnace should be installed in accordance with all national and local building safety codes and requirements local plumbing or wastewater codes and other applicable codes In the absence of local codes install in accordance with the National Fuel Gas Code ANSI Z223 1 NFPA 54 National Fuel Gas Code and or CAN CGA B149 1 Natural Gas and Propane Installation Code latest editions Furnaces have been certified to the latest edition of standard ANSI 221 47 CSA 2 3 Refer to the unit rating plate for the furnace model number and then see the dimensions page of this instruction for return air ple num dimensions in Figure 1 The plenum must be installed according to the instructions Provide clearances from combustible materials as listed under Clearances to Combustibles in Table 1 Provide clearances for servicing ensuring that service access is allowed for both the burners and blower These models ARE NOT CSA listed or approved for installation into a Manufactured Mobile Home T
83. vorizte 325 099 Over variate Terra 69 18 oerna 89 244 CATEGORY 1 450 F MAX VENT TEMP The venting system must be installed in accordance with Section 5 3 Air for Combustion and Ventilation of the National Fuel Gas Code Z223 1 NFPA 54 latest edition or Sections 7 2 7 3 or 7 4 of CSA B149 1 National Gas and Propane Codes latest edition or applicable provisions of the local building code and these instructions The furnace shall be connected to any type of B BW or L vent connec tor and shall be connected to a factory built or masonry chimney The furnace shall not be connected to a chimney flue serving a sepa rate appliance designed to burn solid fuel The furnace rating plate lists the maximum vent gas temperature This temperature must be used to select the appropriate venting materials and clearances It is recommended that the appliance is installed in a location where the space temperature is 32 F 0 C or higher If the appliance is installed in a location where the ambient temperature is below 32 F 0 C the combustion by products could condense causing damage to the appli ance heat exchanger IMPORTANT The VENT SYSTEM must be installed as specified in these instructions for Residential and Modular Homes This appliance may be common vented with another gas appliance for residential installations as allowed by the codes and standards listed in these instructions Approved Modular
84. y safety devices being bypassed Single Wire Staging Operation Heating On a call for first stage heat W1 signal from the wall thermo stat Furnace 1 will start the ignition sequence and the burners will light About thirty seconds after the burners light the blowers on both furnaces will come on in heating speed When the thermostat is satis fied the burners will shut off and after the selected blower off delay time both blowers will shut off at the same time On a call for second stage of heat the burners of Furnace 2 will also light and both blowers will run The twinning control ensures that both blowers come on and shut off at the same time Cooling On a call for cooling Y signal from the wall thermostat both furnace blowers will come on at the same time When the thermostat is satisfied both blowers will stay on for 60 seconds then will shut off at the same time Continuous Fan On a thermostat call for continuous fan G signal both furnace blowers will come on at the same time in cooling speed and will stay on until the G signal is removed FURNACE 2 CONTROL BOARD FURNACE 1 CONTROL BOARD w Ow Oc E o TWIN R TWIN CSS ISOLATION RELAY 5 5 OO TO A C 1 Y W2 WALL THERMOSTAT FIGURE 17 Two Stage Twinning Wiring Diagram Unitary Products Group SECTION VII VENT

GY8S - Virginia Air

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