Installation Instructions - Bryant 226A Heat Pump
Contents
1. 24VAC Hot Heating 24VAC Hot Cooling pol oO J 2 Dry Contact 1 Dry Contact 2 24VAC Common jad Cc Humidify Humidifier Solenoid Valve g 5 Ake Outdoor Air Temp Remote Room Sensor Outdoor Sensor OAT RRS Com Remote Room Sensor A12259 Fig 9 Thermidistat Model T6 PRH01 A or T6 NRHO1 A with Variable Speed Furnace and 226A 2 Stage Heat Pump non communicating LEGEND _ 24v Factory Wiring gt 24v Field Wiring Field Splice Connection A09306 Sequence of Operation NOTE Defrost control board is equipped with 5 minute lockout timer that is initiated upon any interruption of power Turn on power to indoor and outdoor units Transformer is energized These models utilize a 2 stage indoor thermostat With a call for first low stage cooling or heating the outdoor fan and low stage compressor are energized If low stage cannot satisfy cooling or heating demand high stage is energized by the second high stage of the indoor thermostat After the second stage is satisfied the unit returns to low stage operation until second stage is required again When both first and second stage cooling or heating are satisfied the compressor will shut off Cooling With first stage cooling Y and O are powered on and with second stage cooling Y2 Y and O are powered on The O energizes the reversing valve switching it to cooling po2. allow sufficient space for airflow clearance wiring refrigerant piping and service Allow 24 in 609 6 mm clearance to service end of unit and 48 in 1219 2 mm above unit For proper airflow a 6 in 152 4 mm clearance on 1 side of unit and 12 in 304 8 mm on all remaining sides must be maintained Maintain a distance of 24 in 609 6 mm between units Position so water snow or ice from roof or eaves cannot fall directly on unit On rooftop applications locate unit at least 6 in 152 4 mm above roof surface 3 8 in 9 53 mm Dia Tiedown Knockouts in Basepan 2 Places C i lt y 9 Nc I rls See ai os Me View From Top UNIT BASE PAN TIEDOWN KNOCKOUT LOCATIONS in mm Dimension in mm A B c 35 X 35 889 X 889 9 1 8 231 8 6 9 16 166 7 28 7 16 722 3 A05177 Fig 2 Tiedown Knockout Locations Operating Ambient The minimum outdoor operating ambient in cooling mode is 55 F 12 78 C and the maximum outdoor operating ambient in cooling mode is 120 F 48 89 C The maximum outdoor operating ambient in heating mode is 66 F 18 89 C NOTE Units operating at high stage operation 208v or below line voltage and at an outdoor ambient of 120 F 48 9 C or greater may experience compressor thermal trip Check Defrost Thermo
3. as coastal applications See Users Manual for information PURON R 410A QUICK REFERENCE GUIDE e Puron refrigerant operates at 50 70 percent higher pressures than R 22 Be sure that servicing equipment and replacement components are designed to operate with Puron Puron refrigerant cylinders are rose colored Recovery cylinder service pressure rating must be 400 psig DOT 4BA400 or DOT BW400 Puron systems should be charged with liquid refrigerant Use a commercial type metering device in the manifold hose when charging into suction line with compressor operating Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low side retard Use hoses with 700 psig service pressure rating Leak detectors should be designed to detect HFC refrigerant Puron as with other HFCs is only compatible with POE oils Vacuum pumps will not remove moisture from oil Do not use liquid line filter driers with rated working pressures less than 600 psig Do not leave Puron suction line filter driers in line longer than 72 hours Do not install a suction line filter drier in liquid line POE oils absorb moisture rapidly Do not expose oil to atmosphere POE oils may cause damage to certain plastics and roofing materials Wrap all filter driers and service valves with wet cloth when brazing A factory approved liquid line filter drier is required on every unit Do NOT use an R 22 TXV If indoor unit is equipped w
4. the safety alert symbol DANGER identifies the most serious hazards which will result in severe personal injury or death WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage NOTE is used to highlight suggestions which will result in enhanced installation reliability or operation A WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Before installing modifying or servicing system main electrical disconnect switch must be in the OFF position There may be more than 1 disconnect switch Lock out and tag switch with a suitable warning label INSTALLATION RECOMMENDATIONS NOTE In some cases noise in the living area has been traced to gas pulsations from improper installation of equipment 1 Locate unit away from windows patios decks etc where unit operation sound may disturb customer 2 Ensure that vapor and liquid tube diameters are appropriate for unit capacity 3 Run refrigerant tubes as directly as possible by avoiding un necessary turns and bends 4 Leave some slack between structure and unit to absorb vi bration 5 When passing refrigerant tubes through the wall seal open ing with RTV or other pliable silicon based caulk See Fig 1 6 Avoid direct tubing contact with water pipes duct work floor joists wa
5. 226A Preferred Series 2 Stage Heat Pump with Puron Refrigerant 2 To 5 Nominal Tons Installation Instructions NOTE Read the entire instruction manual before starting the installation SAFETY CONSIDERATIONS Improper installation adjustment alteration service maintenance or use can cause explosion fire electrical shock or other conditions which may cause death personal injury or property damage Consult a qualified installer service agency or your distributor or branch for information or assistance The qualified installer or agency must use factory authorized kits or accessories when modifying this product Refer to the individual instructions packaged with the kits or accessories when installing Follow all safety codes Wear safety glasses protective clothing and work gloves Use quenching cloth for brazing operations Have fire extinguisher available Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit Consult local building codes and current editions of the National Electrical Code NEC NFPA 70 In Canada refer to current editions of the Canadian electrical code CSA 22 1 Recognize safety information This is the safety alert symbol A When you see this symbol on the unit and in instructions or manuals be alert to the potential for personal injury Understand these signal words DANGER WARNING and CAUTION These words are used with
6. 3 4 036 3 8 3 8 7 8 7 8 048 060 3 8 3 8 7 8 1 1 8 Units are rated with 25 ft 7 6 m of lineset See Product Data sheet for performance data when using different size and length linesets Notes 1 Do not apply capillary tube indoor coils to these units 2 For Tubing Set lengths between 80 and 200 ft 24 38 and 60 96 m horizontal or 20 ft 6 1 m vertical differential refer to the Residential Piping and Longline Guideline using Puron refrigerant Install Liquid Line Filter Drier Indoor Refer to Fig 5 and install filter drier as follows 1 Braze 5 in 127 mm liquid tube to the indoor coil 2 Wrap filter drier with damp cloth 3 Braze filter drier to 5 in 127 mm long liquid tube from step 1 4 Connect and braze liquid refrigerant tube to the filter drier A05227 Fig 5 Liquid Line Filter Drier Refrigerant tubing and indoor coil are now ready for leak testing This check should include all field and factory joints Evacuate Refrigerant Tubing and Indoor Coil A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation Never use the system compressor as a vacuum pump Refrigerant tubes and indoor coil should be evacuated using the recommended deep vacuum method of 500 microns The alternate triple evacuation method may be used see triple evacuation procedure in service manual Always break a vacuum with dr
7. CONTACTOR FIELD POWER O i WIRING 2 O ne O O WIRING GROUND LUG A12257 Fig 7 Line Connections Connect Control Wiring Route 24v control wires through control wiring grommet and connect leads to control wiring See Thermostat Installation Instructions for wiring specific unit combinations See Fig 8 and Fig 9 Use No 18 AWG color coded insulated 35 C minimum wire If thermostat is located more than 100 ft 30 5 m from unit as measured along the control voltage wires use No 16 AWG color coded wire to avoid excessive voltage drop All wiring must be NEC Class 1 and must be separated from incoming power leads Use furnace transformer fan coil transformer or accessory transformer for control power 24v 40va minimum NOTE Use of available 24v accessories may exceed the minimum 40va power requirement Determine total transformer loading and increase the transformer capacity or split the load with an accessory transformer as required Final Wiring Check IMPORTANT Check factory wiring and field wire connections to ensure terminations are secured properly Check wire routing to ensure wires are not in contact with tubing sheet metal etc Compressor Crankcase Heater All sizes are equipped with a crankcase heater Furnish power to heater a minimum of 24 hours before starting unit To furnish power to heater only set thermostat to OFF and close electrical disconnect to outdoor unit A crankcas
8. If line length is beyond 80 ft 24 38 m or greater than 20 ft 6 10 m vertical separation See Long Line Guideline for special charging requirements Heating Check Chart Procedure To check system operation during heating cycle refer to the Heating Check Chart on outdoor unit This chart indicates whether a correct relationship exists between system operating pressure and air temperature entering indoor and outdoor units If pressure and temperature do not match on chart system refrigerant charge may not be correct Do not use chart to adjust refrigerant charge Verify 226A units for proper switching between low amp high stages Check the suction pressures at the service valves Suction pressure should be reduced by 3 10 when switching from low to high capacity Compressor current should increase 20 45 when switching from low to high stage The compressor solenoid when energized in high stage should measure 24vac at leads inside control box When the compressor is operating in low stage the 24v DC compressor solenoid coil is de energized When the compressor is operating in high stage the 24v DC solenoid coil is energized The solenoid plug harness that is connected to the compressor HAS an internal rectifier that converts the 24v AC signal to 24v DC DO NOT INSTALL A PLUG WITHOUT AN INTERNAL RECTIFIER Unloader Test Procedure The unloader is the compressor internal mechanism controlled by the DC solenoid that modulates betw
9. LLATION Check Equipment and Job Site Unpack Unit Move to final location Remove carton taking care not to damage unit Inspect Equipment File claim with shipping company prior to installation if shipment is damaged or incomplete Locate unit rating plate on unit corner panel It contains information needed to properly install unit Check rating plate to be sure unit matches job specifications Install on a Solid Level Mounting Pad If conditions or local codes require the unit be attached to pad tie down bolts should be used and fastened through knockouts provided in unit base pan Refer to unit mounting pattern in Fig 2 to determine base pan size and knockout hole location For hurricane tie downs contact distributor for details and PE Certification Professional Engineer if required On rooftop applications mount on level platform or frame Place unit above a load bearing wall and isolate unit and tubing set from structure Arrange supporting members to adequately support unit and minimize transmission of vibration to building Consult local codes governing rooftop applications Roof mounted units exposed to winds above 5 mph 8 05 km h may require wind baffles Consult the Service Manual Residential Split System Air Conditioners and Heat Pumps for wind baffle construction NOTE Unit must be level to within 2 3 8 in ft 9 5 mm m per compressor manufacturer specifications Clearance Requirements When installing
10. e heater is required if refrigerant tubing is longer than 80 ft 24 4 m or when outdoor unit is 20 ft 6 1 m below the indoor unit Refer to the Residential Piping and Long Line Guideline Install Electrical Accessories Refer to the individual instructions packaged with kits or accessories when installing Airflow Selections ECM Furnaces The ECM Furnaces provide blower operation to match the capacities of the compressor during high and low stage cooling operation Tap selections on the furnace control board enable the installing technician to select the proper airflows for each stage of cooling Below is a brief summary of the furnace airflow configurations 1 The Y2 call for high stage cooling energizes the Cool tap on the control board The grey wire from cool tap is connec ted to tap 5 on the motor Refer to the furnace Product Data to find the corresponding airflow If the airflow setting for high cooling needs to be switched from tap 5 to a different tap jumper a connection from the cool tap to the desired tap so that the Y2 signal is communicated via the cool tap to the desired speed tap 2 The Y1 call for low stage cooling energizes the Fan tap on the control board The red wire from the fan tap is con nected to tap 1 on the motor Refer to the furnace Product Data to find the corresponding airflow If the airflow setting for low cooling needs to be switched from tap 1 to a differ ent tap jumper a connecti
11. eck refrigerant charge for maximum efficiency Refrigerant Tubing and Sweat Connections Connect vapor tube to fitting on outdoor unit vapor service valves see Table 2 Connect liquid tubing to adapter tube on liquid service valve Use refrigerant grade tubing A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation Service valves must be wrapped in a heat sinking material such as a wet cloth while brazing Remove plastic retainer holding outdoor piston in liquid service valve leaving the piston and piston retainer inside the valve Connect sweat flare adapter provided to valve See Fig 4 Connect refrigerant tubing to fittings on outdoor unit vapor and liquid service valves Service valves are closed from factory and ready for brazing After wrapping service valve with a wet cloth tubing set can be brazed to service valve using either silver bearing or non silver bearing brazing material Do not use soft solder materials which melt below 800 F 427 C Consult local code requirements TEFLON SEAL L SWEAT FLARE ADAPTER L PISTON PISTON BODY LIQUID SERVICE VALVE A05226 Fig 4 Liquid Service Valve Table 2 Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters In LIQUID RATED VAPOR UNIT SIZE Connection Tube Connection Tube Diameter Diameter Diameter Diameter 024 3 8 3 8 3 4
12. een high and low stage If it is suspected that the unloader is not working the following methods may be used to verify operation 1 Operate the system and measure compressor amperage Cycle the unloader on and off at 30 second plus intervals at the thermostat from low to high stage and back to low stage Wait 5 seconds after staging to high before taking a reading The compressor amperage should go up or down at least 20 percent 2 If the expected result is not achieved remove the solenoid plug from the compressor and with the unit running and the thermostat calling for high stage test the voltage output at the plug with a DC voltmeter The reading should be 24 volts DC 3 If the correct DC voltage is at the control circuit molded plug measure the compressor unloader coil resistance The resistance should be approximately 330 or 1640 ohms de pending on unloader coil supplier If the coil resistance is infinite or is grounded the compressor must be replaced Final Checks IMPORTANT Before leaving job be sure to do the following 1 Ensure that all wiring is routed away from tubing and sheet metal edges to prevent rub through or wire pinching 2 Ensure that all wiring and tubing is secure in unit before adding panels and covers Securely fasten all panels and covers 3 Tighten service valve stem caps to 1 12 turn past finger tight 4 Leave Owner s Manual with owner Explain system opera tion and periodic maintenance re
13. gerant into the atmosphere Recover refrigerant during system repair or final unit disposal A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation If ANY refrigerant tubing is buried provide a 6 in 152 4 mm vertical rise at service valve Refrigerant tubing lengths up to 36 in 914 4 mm may be buried without further special consideration Do not bury lines longer than 36 in 914 4 mm Outdoor units may be connected to indoor section using accessory tubing package or field supplied refrigerant grade tubing of correct size and condition For tubing requirements beyond 80 ft 24 4 m substantial capacity and performance losses can occur Following the recommendations in the Residential Piping and Long Line Guideline will reduce these losses Refer to Table 1 for accessory requirements Refer to Table 2 for field tubing diameters There are no buried line applications greater than 36 in 914 4 mm If refrigerant tubes or indoor coil are exposed to atmosphere they must be evacuated to 500 microns to eliminate contamination and moisture in the system Outdoor Unit Connected to Factory Approved Indoor Unit Outdoor unit contains the correct system refrigerant charge for operation with factory approved AHRI rated indoor unit with highest sales volume when connected by 15 ft 4 57 m of field supplied or factory accessory tubing and factory supplied filter drier Ch
14. inuous fan speed can be changed using the fan switch on the thermostat Refer to the furnace Installa tion Instructions for details of how to use this feature Airflow Selection for FV4C Fan Coils non communicating The FV4 provides high and low stage blower operation to match the capacities of the compressor at high and low stage To select recommended airflow refer to the FV4C Installation Instructions The FV4C utilizes an Easy Select control board that allows the installing technician to select proper airflows This fan coil has an adjustable blower off delay factory set at 90 sec for high and low stage blower operation Start Up A CAUTION PERSONAL INJURY HAZARD Failure to follow this caution may result in personal injury Wear safety glasses protective clothing and gloves when handling refrigerant and observe the following e Front seating service valves are equipped with Schrader valves CAUTION a ENVIRONMENTAL HAZARD A CAUTION UNIT OPERATION AND SAFETY HAZARD Failure to follow this caution may result in personal injury equipment damage or improper operation e Do not overcharge system with refrigerant Do not operate unit in a vacuum or at negative pressure e Do not disable low pressure switch in scroll compressor applications e Compressor dome temperatures may be hot Follow these steps to properly start up system 1 After system is evacuated fully open liquid and vapor se
15. ith an R 22 TXV or piston metering device it must be changed to a hard shutoff Puron TXV Never open system to atmosphere while it is under a vacuum When system must be opened for service recover refrigerant evacuate then break vacuum with dry nitrogen and replace filter driers Evacuate to 500 microns prior to recharging Do not vent Puron into the atmosphere Do not use capillary tube coils Observe all warnings cautions and bold text All indoor coils must be installed with a hard shutoff Puron TXV metering device 2012 Bryant Heating amp Cooling Systems 7310 W Morris St Indianapolis IN 46231 Edition Date 06 12 Catalog No II226A 02 Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Replaces II226A 01 10
16. ll studs floors and walls 7 Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap which comes in direct contact with tubing See Fig 1 8 Ensure that tubing insulation is pliable and completely sur rounds vapor tube 9 When necessary use hanger straps which are 1 in wide and conform to shape of tubing insulation See Fig 1 10 Isolate hanger straps from insulation by using metal sleeves bent to conform to shape of insulation OUTDOOR WALL INDOOR WALL ae y wa F LIQUID TUBE Nr t SUCTION TUBE INSULATION THROUGH THE WALL OST HANGER STRAP AROUSE ONLY INSULATION o SUCTION TUBE Oo Oo Oo 1 25 4mm ae N MIN LIQUID TUBE SUSPENSION A07588 Fig 1 Connecting Tubing Installation When outdoor unit is connected to factory approved indoor unit outdoor unit contains system refrigerant charge for operation with AHRI rated indoor unit when connected by 15 ft 4 57 m of field supplied or factory accessory tubing For proper unit operation check refrigerant charge using charging information located on control box cover and or in the Check Charge section of this instruction IMPORTANT Maximum liquid line size is 3 8 in OD for all residential applications including line line IMPORTANT Always install the factory supplied liquid line filter drier Obtain replacement filter driers from your distributor or branch INSTA
17. on from the Fan tap to the desired tap so that the Y1 signal is communicated via the Fan tap to the desired speed tap The Y1 setting will also govern the continuous fan airflow for the furnace Refer to the literature for the furnace for further details Airflow Selection for Variable Speed Furnaces non communicating The variable speed furnaces provide blower operation to match the capacities of the compressor during high and low stage cooling operation The furnace control board allows the installing technician to select the proper airflows for each stage of cooling Below is a summary of required adjustments See furnace installation instructions for more details 1 Turn SW1 5 ON for 400 CFM ton airflow or OFF for 350 CFM ton airflow Factory default is OFF 2 The A C DIP switch setting determines airflow during high stage cooling operation Select the A C DIP switch setting corresponding to the available airflow shown in the furnace Installation Instructions that most closely matches the re quired airflow shown in the air conditioning Product Data for HIGH speed 3 The CF DIP switch setting determines airflow during low stage cooling operation Select the CF DIP switch setting corresponding to the available airflow shown in the furnace installation instructions that most closely matches the re quired airflow shown in the air conditioning Product Data for LOW speed If a higher or lower continuous fan speed is desired the cont
18. on pocket effectively reducing the displacement of the scroll The opening and closing of the by pass port is controlled by an internal electrically operated solenoid The modulated scroll uses a single step of unloading to go from full capacity to approximately 67 capacity A single speed high efficiency motor continues to run while the scroll modulates between the two capacity steps Modulation is achieved by venting a portion of the gas in the first suction pocket back to the low side of the compressor thereby reducing the effective displacement of the compressor Full capacity is achieved by blocking these vents thus increasing the displacement to 100 A DC solenoid in the compressor controlled by a rectified 24 volt AC signal in the external solenoid plug moves the slider ring that covers and uncovers these vents The vent covers are arranged in such a manner that the compressor operates at approximately 67 capacity when the solenoid is not energized and 100 capacity when the solenoid is energized The loading and unloading of the two step scroll is done on the fly without shutting off the motor between steps NOTE 67 compressor capacity translates to approximately 75 cooling or heating capacity at the indoor coil The compressor will always start unloaded and stay unloaded for five seconds even when the thermostat is calling for high stage capacity Quiet Shift 2 Quiet shift 2 is a field selectable defrost mode facto
19. or subcooling charging Favorable conditions exist when the outdoor temperature is between 70 F and 100 F 21 11 C and 37 78 C and the indoor temperature is between 70 F and 80 F 21 11 C and 26 67 C Follow the procedure below Unit is factory charged for 15ft 4 57 m of lineset Adjust charge by adding or removing 0 6 oz ft 018 kg m of 3 8 liquid line above or below 15ft 4 57 m respectively For standard refrigerant line lengths 80 ft 24 38 m or less allow system to operate in cooling mode at least 15 minutes If conditions are favorable check system charge by subcooling method If any adjustment is necessary adjust charge slowly and allow system to operate for 15 minutes to stabilize before declaring a properly charged system If the indoor temperature is above 80 F 26 67 C and the outdoor temperature is in the favorable range adjust system charge by weight based on line length and allow the indoor temperature to drop to 80 F 26 67 C before attempting to check system charge by subcooling method as described above If the indoor temperature is below 70 F 21 11 C or the outdoor temperature is not in the favorable range adjust charge for line set length above or below 15ft 4 57 m only Charge level should then be appropriate for the system to achieve rated capacity The charge level could then be checked at another time when the both indoor and outdoor temperatures are in a more favorable range NOTE
20. quirements outlined in manual 5 Fill out Dealer Installation Checklist and place in customer file TROUBLESHOOTING If the compressor fails to operate with a cooling call the table below Resistance table can be used to verify if there is any damage to the compressor windings causing system malfunction Table 3 Winding Resistance Winding resistance at 70 F 20 F Winding 21 11 C 11 11 C 024 036 048 060 Start S C 1 64 1 54 1 86 1 63 Run R C 1 30 0 88 0 52 0 39 MAJOR COMPONENTS 2 Stage Compressor The 2 stage compressor contains motor windings that provide 2 pole 3500 RPM operation Compressor Internal Relief The compressor is protected by an internal pressure relief IPR which relieves discharge gas into compressor shell when differential between suction and discharge pressures exceeds and 550 625 psi The compressor is also protected by an internal overload attached to motor windings Compressor Control Contactor The contactor has a 24 volt coil and is controlled by Y input from the thermostat High and Low Pressure Switches High and low pressure switches are provided in line with the Y signal to the contactor for protection CARE AND MAINTENANCE For continuing high performance and to minimize possible equipment failure periodic maintenance must be performed on this equipment Frequency of maintenance may vary depending upon geographic areas such
21. r vice valves Failure to follow this caution may result in environmental 2 Unit is shipped with valve stem s front seated closed and damage caps installed Replace stem caps after system is opened to Federal regulations require that you do not vent refrigerant to refrigerant flow back seated Replace caps finger tight and the atmosphere Recover during system repair or final unit tighten with wrench an additional 1 12 turn disposal 3 Close electrical disconnects to energize system Thermidistat Fan Coil Heat Pump RVS Cooling Heat Stage 3 Heat Cool Stage 1 Heat Cool Stage 2 Fan 24VAC Hot Heating 24VAC Hot Cooling Remove J1 Jumper Dry Contact 1 Dry Contact 2 24VAC Common Humidif D A Humidifier Solenoid Valve Outdoor Air Temp Remote Room Sensor Outdoor Sensor OAT RRS Com Remote Room Sensor A12258 Fig 8 Thermidistat Model T6 PRH01 A or T6 NRHO1 A Wiring with Fan Coil and 226A 2 Stage Heat Pump non communicating for Dehumidify modes 4 Set room thermostat at desired temperature Be sure set point is below indoor ambient temperature Set room thermostat to HEAT or COOL and fan control to ON or AUTO mode as desired Operate unit for 15 minutes Check system refrigerant charge Thermidistat Furnace Heat Pump RVS Cooling Heat Stage 3 furnace i z N Heat Cool Stage 1 Heat Cool Stage 2 ii x gt Fan
22. rost cycle is terminated when defrost thermostat opens or automatically after 10 minutes Defrost Speedup To initiate a forced defrost speedup pins J1 must be shorted with a flat head screwdriver for 5 seconds and RELEASED If the defrost thermostat is open a short defrost cycle will be observed actual length depends on Quiet Shift 2 switch position When Quiet Shift 2 is off only a short 30 second defrost cycle is observed With Quiet Shift 2 ON the speedup sequence is approximately 3 minutes 1 minute compressor off period followed by 30 seconds of defrost with compressor operation When returning to heating mode the compressor will turn off for an additional 1 minute If the defrost thermostat is closed a complete defrost cycle is initiated If the Quiet Shift 2 switch is turned on the compressor will be turned off for two 1 minute intervals as explained previously s0 ry A Aa SS 090 Ogg zs p gt O C gt 3 p Fa zm H GQ j HO EINI WAIN loej los i _ Speedup Quiet Defrost interval Pins Shift DIP switches A05378 Fig 10 Defrost Control Check Charge Factory charge amount and desired subcooling are shown on unit rating plate Charging method is shown on information plate inside unit To properly check or adjust charge conditions must be favorable f
23. ry set to OFF which will reduce the occasional noise that could be heard at the start of defrost cycle and restarting of heating cycle It is selected by placing DIP switch 3 on defrost board in the ON position When Quiet Shift 2 switch is placed in ON position and defrost is initiated the following sequence of operation will occur The compressor will be de energized for approximately 1 minute then the reversing valve will be energized A few seconds later the compressor will be re energized and the normal defrost cycle starts Once defrost termination conditions have been met the following sequence will occur The compressor will be de energized for approximately 1 minute then the reversing valve will be de energized A few seconds later the compressor will be re energized and the normal heating cycle starts Defrost The defrost control is a time temperature control which has field selectable settings of 30 60 90 or 120 minutes factory set to 90 minutes These settings represent the amount of time that must pass after closure of the defrost thermostat before the defrost sequence begins The defrost thermostat senses coil temperature throughout the heating cycle When the coil temperature reaches the defrost thermostat setting of approximately 32 F 0 C it will close which energizes the DFT terminal and begins the defrost timing sequence When the DFT has been energized for the selected time the defrost cycle begins Def
24. sition The Y signal sends low voltage through the safeties and energizes the T1 terminal on the circuit board If the compressor has been off for 5 minutes or power has not been cycled for 5 minutes the OF2 relay and T2 terminal will energize This will close the contactor and start the outdoor fan motor and compressor When the cycle is complete Y is turned off stopping the compressor and outdoor fan The 5 minute time guard begins counting Compressor will not come on until this delay expires In the event of a power interruption the time guard will not allow another cycle for 5 minutes Heating With first stage heating Y is powered on with second stage heating Y2 and Y are powered on The Y signal sends low voltage through the safeties and energizes the T1 terminal on the circuit board If the compressor has been off for 5 minutes or power has not been cycled for 5 minutes the OF2 relay and T2 terminal will energize This will close the contactor and start the outdoor fan motor and compressor When the cycle is complete Y is turned off stopping the compressor nd outdoor fan The 5 minute time guard begins counting Compressor will not come on until this delay expires In the event of a power interruption the time guard will not allow another cycle for 5 minutes Compressor Operation The basic scroll design has been modified with the addition of an internal unloading mechanism that opens a by pass port in the first compressi
25. stat Check defrost thermostat to ensure it is properly located and securely attached There is a liquid header with a brass distributor and feeder tube going into outdoor coil At the end of the one of the feeder tubes there is a 3 8 in O D stub tube approximately 2 in long See Fig 3 The defrost thermostat should be located on stub tube Note that there is only one stub tube used with liquid header and on most units it is the bottom circuit FEEDER TUBE AU DEFROST THERMOSTAT A97517 Fig 3 Defrost Thermostat Location Elevate Unit A CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in equipment damage or improper operation Do not allow water and or ice to build up in base pan Elevate unit per local climate and code requirements to provide clearance above estimated snowfall level and ensure adequate drainage of unit A CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in equipment damage or improper operation Locate the unit in such a way that it is stable in all circumstances including adverse weather conditions Table 1 Accessory Usage REQUIRED FOR Accessory LONG De APUCA ake SEA COAST APPLICATIONS Within 2 miles 3 22 km Accumulator Standard Standard Compressor Start Assist Capacitor and Relay Yes No Crankcase Heater Standard Standard Evaporator Free
26. ult in equipment damage or improper operation Installation of filter drier in liquid line is required Make Electrical Connections amp WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Do not supply power to unit with compressor terminal box cover removed NOTE Use copper wire only between disconnect switch and unit NOTE Install branch circuit disconnect of adequate size per NEC to handle unit starting current Locate disconnect within sight from and readily accessible from unit per Section 440 14 of NEC Route Ground and Power Wires Remove access panel to gain access to unit wiring Extend wires from disconnect through power wiring hole provided and into unit control box 4 Connect Ground and Power Wires Connect ground wire to ground connection in control box for safety Connect power wiring to contactor as shown in Fig 7 A WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death The unit cabinet must have an uninterrupted or unbroken ground to minimize personal injury if an electrical fault should occur The ground may consist of electrical wire or metal conduit when installed in accordance with existing electrical codes Connect ground wire to ground connection in control box for safety Connect power wiring to contactor as shown in Fig 7 DISCONNECT PERN E C AND OR LOCAL CODES
27. y nitrogen Deep Vacuum Method The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum gage capable of accurately measuring this vacuum depth The deep vacuum method is the most positive way of assuring a system is free of air and liquid water A tight dry system will hold a vacuum of 1000 microns after approximately 7 minutes See Fig 6 5000 4500 4000 3500 9 3000 Q 2500 o 2000 1500 1000 500 LEAK IN SYSTEM VACUUM TIGHT ITO WET TIGHT DRY SYSTEM MINUTES A95424 Fig 6 Deep Vacuum Graph Final Tubing Check IMPORTANT Check to be certain factory tubing on both indoor and outdoor unit has not shifted during shipment Ensure tubes are not rubbing against each other or any sheet metal Pay close attention to feeder tubes makings sure wire ties on feeder tubes are secure and tight Be sure field wiring complies with local and national fire safety and electrical codes and voltage to system is within limits shown on unit rating plate Contact local power company for correction of improper voltage See unit rating plate for recommended circuit protection device NOTE Operation of unit on improper line voltage constitutes abuse and could affect unit reliability See unit rating plate Do not install unit in system where voltage may fluctuate above or below permissible limits A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may res
28. ze Thermostat No No Hard Shutoff TXV Standard with i aes indoor unit Yes Isolation Relay No No Liquid Line Solenoid Valve See Long Line Application Guideline No Support Feet Recommended Recommended For tubing line sets between 80 and 200 ft 24 38 and 60 96 m and or 20 ft 6 09 m vertical differential refer to Residential Piping and Longline Guideline In Long Line Applications Install Liquid Line Solenoid Valve LSV For refrigerant piping arrangements with equivalent lengths greater than 80 ft 24 38 m and or when elevation difference between indoor and outdoor unit is greater than 20 ft 6 10 m follow all requirements of the Residential Piping and Long Line Guideline If required by Long Line Guideline install LSV kit part no KHALSO401LLS specifically designed for Puron refrigerant heat pumps LSV should be installed within 2 ft 0 61 m of outdoor unit with flow arrow pointing toward outdoor unit Follow the Installation Instructions included with accessory kit IMPORTANT Flow arrow must point toward outdoor unit Make Piping Connections A WARNING PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to follow this warning could result in personal injury or death Relieve pressure and recover all refrigerant before system repair or final unit disposal Use all service ports and open all flow control devices including solenoid valves Federal regulations require that you do not vent refri
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