Lennox International Inc. 2SCU13 Air Conditioner User Manual
Contents
1. ACCORDANCE WITH NATIONAL AND LOCAL CODES CAPACITOR OUTDOOR FAN HEATER COMPRESSOR LINE VOLTAGE FACTORY INSTALLED CONTACTOR COMPRESSOR LINE VOLTAGE FIELD INSTALLED SWITCH HIGH PRESSURE 24 VOLT FACTORY INSTALLED SWITCH LOSS OF CHARGE CLASS II VOLTAGE FIELD INSTALLED THERMOSTAT S CRANKCASE Three Phase Wiring Diagram P N 48436 001 Figure 13 48283B006 Page 17 Limited Warranty August 1 1997 This warranty gives you specific legal rights and you may have other rights which vary from state province to state province Warrantor Armstrong Air Conditioning Inc 421 Monroe St Bellevue OH 44811 Armstrong Air Conditioning Inc products are available under the following names Air Ease Armstrong Air American Aire Concord Subject to the limitations stated in this warranty we warrant to the first buyer for use the residential heating cooling or heat pump unit when installed operated and maintained as required by this warranty to be free of defects in workmanship or material for a period of 5 years 1 year for commercial equipment from the time of installation We will replace any defective component without cost or expense to you except for the costs of delivery and labor for removal and replacement of the defective component The 2SCU13LB Series air conditioners carry a 5 year compressor warranty The 2SCU13LE Series air conditioners carry a 10 year compressor warranty Wa2. Rated Load Ampacity Compressor Outdoor Fan Maximum Fuse or Circuit Breaker Electrical Connections Tight L Indoor Filter Clean Supply Voltage Unit Off Indoor Blower RPM S P Drop Over Indoor Dry Outdoor Coil Entering Air Temperature Voltage with Compressor Operating Discharge Pressure Vapor Pressure Refrigerant Charge Checked Outdoor Fan Checked L Refrigerant Lines Leak Checked L Properly Insulated L Service Valves Fully Opened Caps Tight L Thermostat Calibrated Properly Set L Level L 48283B006 Page 15 Page 16 OUTDOOR DUAL CAPACITOR ORANGE YELLOW COMPRESSOR COMPRESSOR CONTACTOR CRANKCASE HEATER A4 TIMED OFF CONTROL IF USED TO 24 VAC POWER SOURCE 20 VA MINIMUM NEC CLASS 2 IF USED 208 230 60 1 BLACK K1 1 208 230 60 1 YELLOW RED ORA NGE BLACK CA EQUIPMENT GROUND or PURPLE FOR USE WITH COPPER CONDUCTORS ONLY REFER TO UNIT RATING Noy S4 HIGH PRESSURE SWITCH IF USED PLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES LINE VOLTAGE FACTORY INSTALLED LINE VOLTAGE FIELD INSTALLED 24 VOLT
3. 20 minute period after shutting off the vacuum pump and closing the manifold gauge valves When the requirements above have been met disconnect the manifold hose from the vacuum pump Open the service valves to break the vacuum in the line set and indoor unit Page 9 START UP A CAUTION If unit is equipped with a crankcase heater it should be energized 24 hours before unit start up to prevent compressor damage as a result of slugging 1 Rotate fan to check for frozen bearings or binding 2 Inspect all factory and field installed wiring for loose connections 3 After evacuation is complete open liquid line and suction line service valves to release refrigerant charge contained in outdoor unit into system 4 Replace the stem caps and secure finger tight then tighten an additional 1 6 of a turn 5 Check voltage supply at the disconnect switch The voltage must be within the range listed on the unit nameplate If not do not start equipment until the power company has been consulted and the voltage condition corrected 6 Set thermostat for cooling demand turn on power to indoor blower and close the outdoor unit disconnect switch to start the unit 7 Recheck unit voltage with unit running Power must be within range shown on unit nameplate Refrigerant Charging Units are factory charged with the amount of HCFC 22 refrigerant indicated on the unit rating plate This charge is based on a ma
4. gauge to the service port 3 When testing is completed replace service port cap Tighten finger tight then an additional 1 6 turn To Open Liquid or Suction Line Service Valve 1 Remove stem cap with an adjustable wrench 2 Use a service wrench with a hex head extension to back the stem out counterclockwise as far as it will go Use a 3 16 hex head extension for liquid line service valves and a 5 16 extension for suction line service valves 3 Replace the stem cap Tighten finger tight then tighten an additional 1 6 turn Page 7 Service Valve Stem Cap a Insert hex wrench here To indoor coil Schrader valve open to line set when valve is closed front seated valve front seated Valve Closed Stem Cap z Insert hex Service Port Cap Schrader Valve Valve Open Figure 10 To Close Liquid or Suction Line Service Valve 1 Remove the stem cap with an adjustable wrench 2 Use a service wrench with a hex head extension to turn the stem clockwise to seat the valve Tighten firmly 3 Replace the stem cap Tighten finger tight then tighten an additional 1 6 turn Suction Line Ball Type Service Valve Suction line ball type service valves function the same way as the other valves the difference is in the construc tion see Figure 11 The ball valve is equipped with a service port with a factory installed Schrader valve A service port cap protects the Schrader valve from contamin
5. installing the unit use care to avoid sharp edges INSTALLATION General Read this entire instruction manual as well as the instructions supplied in separate equipment before starting the installation Observe and follow all warn ings cautions instructional labels and tags Failure to comply with these instructions could result in an unsafe condition and or premature component failure These instructions are intended as a general guide only for use by qualified personnel and do not supersede any national or local codes in any way The installation must comply with all provincial state and local codes as well as the National Electrical Code U S or Canadian Electrical Code Canada Compliance should be determined prior to installation When servicing or repairing HVAC components ensure the fasteners are appropriately tightened Table 1 shows torque values for fasteners Torque Table Service Port Caps Torque 8 ft Ibs 8 ft Ibs 16 in lbs 28 in lbs 90 in lbs 8 Machine Screws 10 Machine Screws Compressor Bolts Sheet Metal Screws 16 in Ibs Table 1 Inspection of Shipment Upon receipt of equipment carefully inspect it for possible shipping damage If damage is found it should be noted on the carrier s freight bill Take special care to examine the unit inside the carton if the carton is damaged Any concealed damage discovered should be reported to the last carrier immediatel
6. unit at unit disconnect switch or to an earth ground To facilitate conduit a hole is in the bottom of the control box Connect conduit to the control box using a proper conduit fitting Units are approved for use only with copper conductors 24V Class II circuit connections are made to the low voltage pigtails A complete unit wiring diagram is located inside the unit control box cover see also pages 16 and 17 of this instruction 3 Install room thermostat on an inside wall that is not subject to drafts direct sunshine or other heat sources 4 Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit see Figure 4 5 Donot bundle any excess 24V control wire inside control box Run control wire through installed wire tie and tighten wire tie to provide low voltage strain relief and to maintain separation of field installed low and high voltage circuits Thermostat Designations Thermostat Indoor Unit Outdoor Unit Y1 Outdoor Unit x N SS See unit wiring diagram for power supply connections If the indoor unit is not equipped with a blower relay one must be field supplied and installed Do not connect C common connection between indoor unit and thermostat except when required by the indoor thermostat Refer to thermostat installation instructions C common connection between indoor unit and outdoor unit required for proper operation Figure 4 Refri
7. FACTORY INSTALLED CLASS II VOLTAGE FIELD INSTALLED GROUND 24 LOSS OF CHARGE SWITCH IF USED A4 S24 lt HE D I Lt TO 24 VAC POWER SOURCE 20 VA MINIMUM NEC CLASS 2 DESCRIPTION COMPONENT A4 CONTROL TIMED OFF B1 COMPRESSOR B4 MOTOR OUTDOOR FAN C12 CAPACITOR DUAL HR1 HEATER COMPRESSOR K1 1 CONTACTOR COMPRESSOR S4 SWITCH HIGH PRESSURE S24 SWITCH LOSS OF CHARGE Single Phase Wiring Diagram P N 48352 001 Figure 12 48283B006 B4 OUTDOOR C1 FAN OUTDOOR FAN A4 CAPACITOR TIMED OFF CONTROL Q PURPLE TO 24 VAC IF USED BLACK POWER SOURCE 10 VA MINIMUM NEC CLASS 2 COMPRESSOR B1 CRANKCASE HEATER IF USED oW A I GROUND LUG S4 HIGH S24 LOSS PRESSURE OF CHARGE SWITCH SWITCH ORANGE IF USED IF USED EQUIPMENT fa S24 GROUND HRI lt Yi C TO 24 VAC FOR USE WITH COPPER CONDUCTORS ONLY REFER TO UNIT RATING E ARI PLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVERCURRENT NEC CLASS 2 PROTECTION SIZE A JUMPER IS USED WHEN TOC IS NOT USED DESCRIPTION COMPONENT WARNING CONTROL TIMED OFF ELECTRIC SHOCK HAZARD CAN CAUSE INJURY COMPRESSOR OR DEATH UNIT MUST BE GROUNDED IN MOTOR OUTDOOR FAN
8. INSTALLATION AND MAINTENANCE INSTRUCTIONS 2SCU13 Series Split System Air Conditioner A WARNING The equipment covered in this manual is to be installed by trained and experienced service and installation technicians Improper installation modification service or use can cause electrical shock fire explosion or other conditions which may cause personal injury death or property damage Use appropriate safety gear including safety glasses and gloves when installing this equipment WARNING Risk of electrical shock Disconnect all remote power supplies before installing or INSTALLATION servicing any portion of the system Failure to disconnect power supplies can result in START UP property damage personal injury or death TABLE OF CONTENTS OPERATION WARNING MAINTENANCE Installation and servicing of air conditioning CONNECTION DIAGRAMS equipment can be hazardous due to internal refrigerant pressure and live electrical com WARRANTY ponents Only trained and qualified service personnel should install or service this equip ment Installation and service performed by unqualified persons can result in property Menutactirsd By damage personal injury or death AAC A Lennox International Inc Company 421 Monroe Street Bellevue OH 44811 Save these instructions for future reference 48283B006 Page 1 AWARNING Sharp metal edges can cause injury When
9. ation and serves as the primary seal Page 8 Ball Type Service Valve Valve Open lt Stem Cap To outdoor coil Service S I Port Cap we X Service Port Schrader Valve Use adjustable wrench To open rotate stem counterclockwise 1 4 turn 90 To close rotate stem clockwise 1 4 turn 90 Figure 11 Leak Testing After the line set has been connected to the indoor and outdoor units the line set connections and indoor unit must be checked for leaks A WARNING Refrigerant can be harmful if inhaled Refrigerant must always be used and recovered responsibly Incorrect or irresponsible use of refrigerant can result in personal injury or death A WARNING Never use oxygen to pressurize refrigeration or air conditioning systems Oxygen will ex plode on contact with oil and could cause personal injury or death Using an Electronic Leak Detector Connect the high pressure hose of the manifold gauge set to the suction valve service port Normally the high pressure hose is connected to the liquid line port however connecting it to the suction ports helps to protect the manifold gauge set from damage caused by high pressure 48283B006 2 With both manifold valves closed connect the cylin der of HCFC 22 refrigerant Open the valve on the HCFC 22 cylinder vapor only 3 Open the high pressure side of the manifold to allow HCFC 22 into the line set and indoo
10. cluding without limitation humidifier air cleaner vent damper thermostat or other mechanical devices not manufactured by the warrantor Products that have been operated in a corrosive atmosphere where a concentration of acids halogenated hydrocarbons or other corrosive elements causes deterioration to metal surfaces or integral components NOTE Operation in a corrosive atmosphere is considered abuse and voids this warranty Products that have NOT been installed in accordance with our published installation instructions applicable local state provincial or national codes ACCA published standards Products that have NOT been installed by competent qualified installers Products that have been moved from their original place of installation Warranty on Replacement Components Any replacement component furnished by us will assume the remaining unused portion of the Limited Warranty Consequential Damages The warrantor shall not be responsible for any consequential damages caused by any defect in the product Some state provinces do not allow the exclusion or limitations of incidental or consequential damages so the above limitation or exclusion may not apply to you This product must be installed used and cared for in accordance with the instruction manual You are responsible for required periodic maintenance or service such as changing or cleaning of air filters and lubrication or cleaning of components Failure to properly install ope
11. d during warm weather follow one of the other procedures outlined below Charge Using Subcooling Method Fixed Orifice TXV Systems Outdoor Temperatures 65 F or Above If charging a fixed orifice or TXV system when the outdoor ambient temperature is 65 F or above the subcooling method can be used to charge the unit 1 With the manifold gauge hose on the liquid service port and the unit operating stably use a digital ther mometer to record the liquid line temperature 2 Atthe same time record the liquid line pressure reading 3 Useatemperature pressure chart for HCFC 22 to determine the saturation temperature for the liquid line pressure reading 4 Subtract the liquid line temperature from the satura tion temperature according to the chart to determine subcooling Saturation Temperature F o Liquid Line Temperature F Subcooling Value F 5 Compare the subcooling value with those shown in Table 6 If subcooling is greater than shown recover some refrigerant If subcooling is less than shown add some refrigerant Charge Using Superheat Method Fixed Orifice Systems Outdoor Temperatures 65 F or Above 1 With the manifold gauge hose on the suction service port and the unit operating stably use a digital ther mometer to record the suction line temperature 2 Atthe same time record the suction line pressure reading 48283B006 Subcooling Values for Fixed Orifice or TXV System
12. g material or anchored heavy nylon wire ties Wire Tie around vapor line only Strapping Material around vapor line only Floor Joist or Roof Rafter N Tape or Wire Tie 8 Strap the vapor line to the joist or rafter at 8 intervals then strap the liquid line to the vapor line Metal Sleeve Fi e N N Floor Joist or Roof Rafter a Mittin otto o va or Wire Tie i Figure 6 Refrigerant Line Sets Transition from Vertical to Horizontal Automotive Muffler Type Hanger Anchored Heavy Nylon Wire Tie Strap Liquid _ Line to Vapor d Strap Liquid Line Line to Vapor Line OOM Liquid Line Liquid Line Vapor Line Wrapped Metal SI i Vapor Line Wrapped ss wae Pn fiox Metal Sleeve in Armaflex Figure 7 48283B006 Page 5 Refrigerant Line Sets Installing Vertical Runs new construction shown NOTE Similar installation practices should be used if line set is to be installed on exterior of outside wall Vapor Line Wrapped with Armaflex IMPORTANT Refrigerant Outside Wall Wood Block Between Studs lines must not Liquid Line Outside Wall ec q contact structure Ke PVC Pipe Fiberglass Insulation Caulk IMPORTANT Refrigerant lines must not contact wall Vapor Line Liquid L
13. gerant Piping Field refrigerant piping consists of liquid and suction lines from the outdoor unit sweat connections to the indoor coil flare or sweat connections Select line set diameters from Table 2 on page 4 to ensure that oil returns to the compressor Size vertical Page 3 suction riser to maintain minimum velocity at minimum capacity Recommended line length is 50 or less If more than 50 line set is required contact Technical Services at 419 483 4840 Table 2 shows the diameters for line sets up to 100 although vertical lift applications and trapping require ments need to be reviewed with Technical Services for line sets over 50 Refrigerant Line Set Diameters in Line Set Length and Size son 75 tt too tt Line Set Length and Size BTUH ran 25 son 7 n oor For installations exceeding 50 contact Technical Services at 419 483 4840 BTUH Table 2 Installing Refrigerant Line During the installation of an air conditioning system it is important to properly isolate the refrigerant line to prevent unnecessary vibration Line set contact with the structure wall ceiling or floor may cause objectionable noise when vibration is translated into sound As a result more Page 4 energy or vibration can be expected Close attention to line set isolation must be observed Following are some points to consider when placing and installing a high efficiency outdoor unit Placemen
14. he outdoor ambient temperature 1 F NOTE For best results use the same digital thermometer to check both outdoor ambient and liquid temperatures Table 8 48283B006 Normal Operating Pressures Outdoor Coil Entering Air Temperature 240 80 208 ea 285 5 277 oF sos ss s08 as 318 66 Fixed Orifice RFC o Fixe orifice RFC F ia 73 147 68 140 66 150 F 196 82 203 79 196 76 205 76 198 78 198 80 207 77 95 225 84 238 83 227 so 287 79 228 81 230 84 239 20 ios fase so 22 ss 262 a5 278 o1 262 04 264 86 274 8 Nr 2 s air as so2 06 sa s feco ss sor ee te 5 L Liquid S Suction Values provided above are typical pressures Indoor unit matchup indoor air quality and indoor load will cause pressures to vary Table 9 48283B006 Page 13 OPERATION Outdoor unit and indoor blower cycle on demand from the room thermostat When the thermostat blower switch is moved to the ON position the indoor blower operates continuously Page 14 MAINTENANCE A WARNING Before performing maintenance operations on system turn the electric power to unit OFF at disconnect switch es Unit may have multiple power supplies Electrical shock could cause personal injury or death Maintenance and service must be performed by a quali fied installer or service agency At the beginni
15. ine ae Va Z 4 Wire Tie Wood Block Wire Tie Strap Sleeve Figure 8 3 Use silver alloy brazing rods 5 or 6 silver alloy for copper to copper brazing or 45 silver alloy for copper to brass or copper to steel brazing which are rated for use with HCFC 22 refrigerant 4 Remove the Schrader core assemblies before brazing to protect them from damage due to extreme heat Replace the cores when brazing is complete 5 Wrap a wet cloth around the valve body and copper tube stub to protect them from heat damage during brazing 6 Braze the line set to the service valve Quench the joints with water or a wet cloth to prevent heat damage to the valve core and opening port The tube end must stay bottomed in the fitting during final assembly to ensure proper seating sealing and rigidity 7 Install the factory supplied fixed orifice or thermal expansion valve which is sold separately and which is approved for use with HCFC 22 refrigerant in the liquid line at the indoor coil Page 6 Refrigerant Metering Device 2SCU13 units are designed for use with either fixed orifice or TXV systems Refer to the appropriate following section for information on installing the chosen refrigerant meter ing device Fixed Orifice Systems 2SCU13 units are shipped with a fixed orifice ref
16. ng of each cooling season the system should be checked as follows 1 Clean and inspect condenser coil Coil may be flushed with a water hose Be sure the power is off before using water to clean the coil 2 Outdoor fan motor is pre lubricated and sealed No further lubrication is needed 3 Visually inspect connecting lines and coils for evi dence of oil leaks 4 Check wiring for loose connections 5 Check for correct voltage at unit with unit operating 6 Check amp draw outdoor fan motor Unit nameplate Actual NOTE If owner complains of insufficient cooling the unit should be gauged and refrigerant charge checked Refer to the Refrigerant Charging section on page 10 Indoor Coil 1 Clean coil if necessary 2 Check connecting lines and coils for evidence of oil leaks 3 Check condensate pan line and clean if necessary Indoor Unit 1 Clean or change filters 2 Adjust blower speed for cooling Measure the pressure drop over the coil to determine the correct blower CFM 3 Belt drive blowers Check belt for wear and proper tension 4 Check all wiring for loose connections 48283B006 5 Check for correct voltage at unit with unit operating 6 Check amp draw on blower motor Unit nameplate Actual Start Up and Performance Checklist Job Name Job No Job Location City Installer City Unit Model No Serial No Service Technician Nameplate Voltage
17. quid line temperature and the outdoor ambient temperature as outlined below 1 Connect the manifold gauge set to the service valve ports as follows Low pressure gauge to suction line service valve High pressure gauge to liquid line service valve 2 Close manifold gauge set valves Connect the center manifold hose to an upright cylinder of HCFC 22 3 If room temperature is below 70 F set the room thermo stat to call for heat This will create the necessary load for properly charging the system in the cooling cycle 4 Use a digital thermometer to record the outdoor ambient temperature 5 When the heating demand has been satisfied switch the thermostat to cooling mode with a set point of 68 F When pressures have stabilized use a digital thermometer to record the liquid and suction line temperatures 6 The outdoor temperature will determine which charg ing method to use Proceed with the appropriate charging method 48283B006 Charge Using Weigh In Method Fixed Orifice TXV Systems If the system is void of refrigerant or if the outdoor ambient temperature is cool first locate and repair any leaks then use the weigh in method to charge the unit 1 Recover the refrigerant from the unit 2 Conduct a leak check then evacuate as previously outlined 3 Weigh in the charge according to the total amount shown on the unit nameplate If weighing facilities are not available or if unit is being charge
18. r unit Weigh in a trace amount of HCFC 22 A trace amount is a maximum of 2 oz of refrigerant or 3 Ibs pressure Close the valve on the HCFC 22 cylinder and the valve on the high pressure side of the manifold gauge set Disconnect the HCFC 22 cylinder 4 Connect a cylinder of nitrogen with a pressure regulat ing valve to the center port of the manifold gauge set When using high pressure gas such as nitrogen for this purpose be sure to use a regulator that can control the pressure down to 1 or 2 psig 5 Adjustnitrogen pressure to 150 psig Open the valve on the high side of the manifold gauge set to pressur ize the line set and the indoor coil Evacuation Evacuating the system of noncondensables is critical for proper operation of the unit Noncondensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system Noncondensables and water vapor combine with refrigerant to produce substances that corrode copper piping and compressor parts WARNING Do not use a compressor to evacuate a sys tem Avoid deep vacuum operation Extremely low vacuums can cause internal arcing and compressor failure Danger of equipment damage Damage caused by deep vacuum operation will void warranty Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns Use an instrument that reads down to 50 microns 1 Connec
19. rate or maintain your unit voids this warranty Page 18 48283B006
20. rged or that a problem exists with some component in the system Page 11 Superheat Values for Fixed Orifice Systems 80 DB 67 WB Return Air Outdoor Ambient Temp Superheat F F x G j B m gt e s awama Table 7 Pressures higher than those listed indicate that the system is overcharged Pressures lower than those listed indicate that the system is undercharged Verify adjusted charge using the approach method 4 Use the same digital thermometer to check liquid line temperature 5 Subtract the outdoor ambient temperature from the liquid line temperature to determine the approach temperature Liquid Line Temperature F _ o Outdoor Ambient Temperature F o u Approach Temperature F 6 Compare the approach value with those shown in Table 8 If the values to do not agree with those provided in Table 8 add refrigerant to lower the approach temperature or recover refrigerant from the system to increase the approach temperature Check Charge Using Normal Operating Pressures Use Table 9 to perform maintenance checks Table 9 is not a procedure for charging the system Minor variations in these pressures may be due to differences in installa tions Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system Page 12 Approach Values for TXV Systems Approach value is the liquid line temperature minus t
21. rigerant metering device Replace the existing indoor unit fixed orifice with the orifice supplied with this unit Place the supplied fixed orifice sticker on the indoor cabinet after installation See Table 3 for the proper fixed orifice size for each unit In nonstandard applications the provided fixed orifice may not be appropriately sized Install the fixed orifice as shown in Figure 9 Do not twist cap tubes when loosening the seal nut from the orifice housing Use wrench to back up the distributor Expansion Valve Systems Expansion valves equipped with Chatleff type fittings are available from the manufacturer See Table 4 for proper TXV for each unit 48283B006 Fixed Orifice Data Part Number 2SCU13 18 100484 07 2SCU13 24 100484 12 ascuis 6o rosses 009 1 Table 3 Metering Device Installation Distributor Valve OR Orifice oe O Rin eC Pot s _ Expansion Valve opt O Ring S S Strainer RAJ Liquid Line Stub Wasi eter erat eee eta 1 Figure 9 TXV Data Part Number 2SCU13 18 24 30 36 26K34 2SCU13 42 48 26K35 2SCU13 60 91M01 Table 4 To install an expansion valve see Figure 9 1 Separate the distributor assembly and remove the piston orifice and used teflon seal Insert nozzle end of 48283B006 the expansion valve along with a new teflon seal into the distributor and tighten to 20 30 ft Ibs Use backup wrench on all wrench flats Over
22. rranty Begins The warranty period begins when the installation is complete and the product is ready to operate You must be able to verify this date whenever a warranty claim is made Original bill of sale installer s invoice or other similar document will suffice If the beginning date cannot be verified we will consider warranty coverage to begin 6 months after the date the product was shipped from our factory Limitations on Implied Warranties Implied warranties of merchantability or to the extent applicable fitness for a particular purpose are limited to 5 years the same duration as the basic limited written warranty provided herein Some states provinces do not allow limitations on how long an implied warranty of merchantability or fitness lasts so the above limitations or exclusions may not apply to you Only Warranty This written Limited Warranty is the only warranty made by the warrantor this warranty is in lieu of and excludes all other warranties express or implied The warrantor does not authorize any person to provide any other warranty or to assume for it any further obligation in connection with the warranted product What is NOT Covered Cabinets or cabinet pieces Normal maintenance items such as filters fan belts fuses or other consumable items Damage caused by misuse failure to maintain properly accidents or acts of God External wiring piping venting or attachment of accessory products not integral to our product in
23. s Liquid Subcooling 1 F P 8 2a 30 36 42 48 60 ea elr eleo s o ujs i is 9 12 8s _ 8 tol 5 14 11 9 een aie Ese Ee 05 6 9 s al7 oo eee eae Table 6 3 Useatemperature pressure chart for HCFC 22 to determine the saturation temperature for the suction line pressure reading 4 Subtract the saturation temperature according to the chart from the suction line temperature to determine the superheat Suction Line Temperature F o Saturation Temperature F Superheat Value F 5 Compare the superheat value with those shown in Table 7 on page 12 If superheat is greater than shown add some refrigerant If superheat is less than shown recover some refrigerant Charge Using Approach Method TXV Systems Outdoor Temperatures 65 F or Above The following procedure is intended as a general guide and is for use on expansion valve systems only For best results indoor temperature should 70 F to 80 F Monitor system pressures while charging 1 Record outdoor ambient temperature using a digital thermometer 2 Attach high pressure gauge set and operate unit for several minutes to allow system pressures to stabilize 3 Compare stabilized pressures with those provided in Table 9 on page 13 Minor variations in these pres sures may be expected due to differences in installa tions Significant differences could mean that the system is not properly cha
24. t Be aware that some localities are adopting sound ordinances based on how noisy the unit is at the neighbor s home not at the original installation Install the unit as far as possible from the property line When possible do not install the unit directly outside a bedroom window Glass has a very high level of sound transmission Figure 5 shows how to place the outdoor unit and line set to reduce line set vibration Outside Unit Placement and Installation Install unit away lt from windows gt f n BE a Two 90 elbows installed in lineset will reduce lineset vibration Figure 5 Line Set Isolation Illustrations on the following pages demonstrate proce dures which ensure proper refrigerant line set isolation Figure 6 shows how to install line sets on horizontal runs Figure 7 shows how to make a transition from horizontal to vertical Figure 8 on page 6 shows how to install line sets on vertical runs Brazing Connection Procedure 1 Cut ends of refrigerant lines square free from nicks or dents Debur the ends The pipe must remain round do not pinch end of line 2 Before making line set connections use dry nitrogen to purge the refrigerant piping This will help to prevent oxidation and the introduction of moisture into the system 48283B006 Refrigerant Line Sets Installing Horizontal Runs To hang line set from joist or rafter use either metal strappin
25. t the manifold gauge set to the service valve ports as follows Low pressure gauge to suction line service valve e High pressure gauge to liquid line service valve 2 Connect micron gauge 3 Connect the vacuum pump with vacuum gauge to the center port of the manifold gauge set 4 Open both manifold valves and start vacuum pump 48283B006 Evacuate the line set and indoor unit to a minimum of 500 microns or lower During the early stages of evacuation it is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in pressure A rapid rise in pressure indicates a relatively large leak If this occurs the leak testing procedure must be repeated When 500 microns or lower is maintained close the manifold gauge valves turn off the vacuum pump and disconnect the manifold gauge center port hose from the vacuum pump Attach the manifold gauge center port hose to a nitrogen cylinder with pressure regulator set to 150 psig and purge the hose Open the manifold gauge valves to break the vacuum in the line set and indoor unit Close the manifold gauge valves Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder Open the manifold gauge valves to release the nitrogen from the line set and indoor unit Reconnect the manifold gauge to the vacuum pump turn the pump on and continue to evacuate the line set and indoor unit until 500 microns is maintained within a
26. tching indoor coil and outdoor coil with 15 line set For varying lengths of line set refer to Table 5 for refrigerant charge adjustment Refrigerant Charge Adjustment Liquid Line Set Diameter Oz per 5 ft adjust from 15 ft line set 3 8 in 3 oz per 5 ft If line length is greater than 15 ft add this amount If line length is less than 15 ft remove this amount Table 5 Page 10 If the system is void of refrigerant clean the system using the procedure described below 1 Use dry nitrogen to pressurize the system and check for leaks Repair leaks if possible 2 Evacuate the system to remove as much of the moisture as possible 3 Use dry nitrogen to break the vacuum 4 Evacuate the system again 5 Weigh the appropriate amount of HCFC 22 refrigerant listed on unit nameplate into the system 6 Monitor the system to determine the amount of moisture remaining in the oil Use a test kit to verify that the moisture content is within the kit s dry color range It may be necessary to replace the filter drier several times to achieve the required dryness level If system dryness is not verified the compressor will fail in the future The outdoor unit should be charged during warm weather However applications arise in which charging must occur in the colder months The method of charging is deter mined by the unit s refrigerant metering device and the outdoor ambient temperature Measure the li
27. tightening will crush the teflon seal and may cause a leak 2 Attach liquid line portion of distributor assembly along with new teflon seal to the inlet of the expansion valve Tighten to 20 30 ft Ibs Use backup wrench on all wrench flats Overtightening will crush the teflon seal and may cause a leak 3 Connect the external equalizer line to the equalizer port on the suction line and tighten to 8 ft Ibs 4 Strap the superheat sensing bulb to the suction header If installing an expansion valve on an indoor coil that previously used a fixed orifice be sure to remove the existing fixed orifice Failure to remove a fixed orifice when installing an expansion valve to the indoor coil will result in improper operation and damage to the system Manifold Gauge Set When checking the unit charge use a manifold gauge set that is equipped with low loss hoses Do not use a manifold gauge set with anything other than a low loss hose Liquid and Suction Line Service Valves The liquid line and suction line service valves and service ports are used for leak testing evacuating charging and checking charge Each valve is equipped with a service port which has a factory installed Schrader valve see Figure 10 on page 8 A service port cap protects the Schrader valve from con tamination and serves as the primary leak seal To Access the Schrader Port 1 Remove the service port cap with an adjustable wrench 2 Connect
28. y distributed over roof joists and rafters Either redwood or steel supports are recommended If unit coil cannot be mounted away from prevailing winter winds a wind barrier should be constructed see Figure 3 Size barrier at least the same height and width as the outdoor unit Mount barrier 24 from the sides of the unit in the direction of the prevailing winds 48283B006 Slab Mounting Discharge Air Building Structure Mounting Slab Ground Level 2 or 2 per 5 slope tolerance away from building structure Figure 2 Wind Barrier Construction Prevailing Winter Winds Inlet Air Inlet Air Figure 3 Electrical Wiring All field wiring must be done in accordance with the National Electrical Code NEC recommendations Canadian Electrical Code CEC and CSA Standards or local codes where applicable AWARNING Unit must be grounded in accordance with national and local codes Failure to ground unit properly can result in personal injury or death Refer to the furnace or blower coil Installation Instructions for additional wiring application diagrams and refer to unit rating plate for minimum circuit ampacity and maximum overcurrent protection size 48283B006 Install line voltage power supply to unit from a properly sized disconnect switch Any excess high voltage field wiring should be trimmed or secured away from the low voltage field wiring 2 Ground
29. y preferably in writing and should include a request for inspection by the carrier s agent If any damages are discovered and reported to the carrier DO NOT INSTALL THE UNIT as claim may be denied Check the unit rating plate to confirm specifications are as ordered Page 2 Location of Unit Outdoor units operate under a wide range of weather conditions therefore multiple factors must be considered when positioning the unit The unit must be positioned to give adequate clearances for sufficient airflow and servic ing Refer to Figure 1 for installation clearances Installation Clearances A service clearance of 30 must be maintained on one of the sides adjacent to the control box Clearance to one of the other three sides must be 36 Clearance to one of the remaining two sides may be 12 and the final side may be 6 A clearance of 24 must be maintained between units 48 clearance required on top of unit Maximum soffit overhang is 36 Figure 1 Slab Mounting When installing unit at grade level install on slab high enough above grade to allow adequate drainage of water see Figure 2 Top of slab should be located so runoff water from higher ground will not collect around unit Refer to roof mounting section for barrier construction if unit must face prevailing winter winds Roof Mounting Install unit at a minimum of 4 above surface of the roof Care must be taken to ensure weight of unit is properl
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