Carrier 25HCR Air Conditioner User Manual
Contents
1. 3 8 in Dia Tiedown Knockouts in Base oof J l Jee 2 Places e o s a Se ARON rN H eee a Pb ia F L r NN A ee Ss 1 rae View From Top UNIT BASE PAN TIEDOWN KNOCKOUT LOCATIONS DIMENSIONS A B C 26 X 26 9 1 8 4 7 16 21 1 4 31 1 2 X 31 1 2 9 1 8 6 9 16 24 11 16 35 X35 9 1 8 6 9 16 28 7 16 A05177 Fig 3 Clearance Requirements On rooftop applications locate unit at least 6 in above roof surface STEP 4 Operating Ambient The minimum outdoor operating ambient in cooling mode is 55 F and the maximum outdoor operating ambient in cooling mode is 125 F The maximum outdoor operating ambient in heating mode is 66 F STEP 5 Install TXV NOTE Applies to non TXV indoor units only If installing a rated and approved indoor coil without a factory installed R 22 TXV remove and replace the fixed orifice or Puron TXV expansion device with an R 22 TXV 4 CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in equipment damage or improper operation All indoor coil units must be installed with a hard shut off R 22 TXV metering device IMPORTANT If not factory installed the TXV should be mounted as close to the indoor coil as possible and in a vertical upright position Avoid mounting the inlet tube vertically down Valve is more susceptible to malfunction due to debris if inlet tube is facing down A factory approved filter drier must be installed in the liquid line2. 25HCR COMFORT SERIES R 22 HEAT PUMPS SIZES 18 TO 60 4 1 1 2 TO 5 NOMINAL TONS Turn to the Experts Installation Instructions TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS 004 2 INSTALLATION RECOMMENDATIONS 2 INSTALLATION ec55 03 056506 be eG ee oo Kaee 3 10 Step 1 Check Equipment amp Jobsite 3 Step 2 Install on Solid Pad 0 05 3 Step 3 Clearance Requirements 3 Step 4 Operating Ambient 3 Step 5 Install TXV 2 0 6 cee eee eee 3 4 Step 6 Check Defrost Thermostat 4 Step 7 Make Piping Connections 4 6 Step 8 Make Electrical Connections 6 7 Step 9 Compressor Crankcase Heater 7 Step 10 Install Electrical Accessories 7 Step 11 Start Up sosirii nivgaivaeiwas ciecues 7 9 Step 12 Check Charge 0 0 00 ec ei uii reris 10 Co mfo rt Step 13 Final Checks 0 0 00ceceeeeeeees 10 CARE AND MAINTENANCE 004 10 SERIES A05341 Fig 1 25HCR NOTE Read the entire instruction manual before starting the installation 25HCR 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 di
3. Installing TXV in Place of Piston 1 Pump system down to 2 psig and recover refrigerant 2 Remove hex nut from piston body Use backup wrench on fan coils 3 Remove and discard factory installed piston Be sure Teflon seal is in place 4 Reinstall hex nut Finger tighten nut plus 1 2 turn NOTE If the piston is not removed from the body TXV will not function properly A CAUTION EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation Use a brazing shield and wrap TXV with wet cloth or use heat sink material 5 Install TXV on indoor coil liquid line Sweat swivel adapter to inlet of indoor coil and attach to TXV outlet Use backup wrench to avoid damage to tubing or valve Sweat inlet of TXV marked IN to liquid line Avoid excessive heat which could damage valve 6 Install vapor elbow with equalizer adapter to suction tube of line set and suction connection to indoor coil Adapter has a 1 4 in male connector for attaching equalizer tube 7 Connect equalizer tube of TXV to 1 4 in equalizer fitting on vapor line adapter 8 Attach TXV bulb to horizontal section of suction line using clamps provided Insulate bulb with field supplied insulation tape See Fig 4 for correct positioning of sensing bulb 9 Proceed with remainder of unit installation 25HCR 25HCR 10 O CLOCK 2 O CLOCK SUCTION TUBE ve K 8 O CLOCK 4 O CLOCK 7 IN
4. DIP switch 3 on defrost board see Fig 12 in the ON position When Quiet Shift switch is placed in ON position and a defrost is initiated the following sequence of operation will occur Reversing valve will energize compressor will turn off for 30 seconds and then turn back on to complete defrost At the start of heating after conclusion of defrost reversing valve will de energize compressor will turn off for another 30 seconds and the fan will turn off for 40 seconds before starting in the heating mode 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 degrees F 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 Defrost 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 act
5. terminal will energize This will close the contactor and start the outdoor fan motor and compressor When the cycle is complete R Y is turned off stopping the compressor and outdoor fan The 5 minute time guard begins counting Compressor will not come on again until this delay expires In the event of a power interruption the time guard will not allow another cycle for 5 minutes NOTE If the indoor blower off delay is enabled it will run up to an additional 90 seconds to increase system efficiency Heating On a call for heating thermostat makes circuits R Y and R G Circuit R Y sends low voltage through the safeties and energizes the T1 terminal on the circuit board T1 energizes the defrost logic circuit 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 start the outdoor fan motor and compressor When the cycle is complete R Y is turned off stopping the compressor and outdoor fan The 5 minute time guard begins counting Compressor will not come on again until this time delay expires In the event of a power interruption the time guard will not allow another cycle for 5 minutes Quiet Shift Quiet shift is a field selectable defrost mode factory set to OFF which will eliminate occasional noise that could be heard at the start of defrost cycle and restarting of heating cycle It is selected by placing
6. to 1 12 turn past finger tight 4 Leave Users Manual with owner Explain system operation and periodic maintenance requirements outlined in manual 5 Fill out Dealer Installation Checklist and place in customer file Printed in U S A Table 3 Required Liquid Line Temperature Liquid bora Required Subcooling Temperature F Valve PSIG 5 10 15 30 134 71 66 61 56 141 74 69 64 59 148 77 72 67 62 156 80 75 70 65 163 83 78 73 68 171 86 81 76 74 179 89 84 79 74 187 92 87 82 77 196 95 90 85 80 205 98 93 88 83 214 101 96 91 86 223 104 99 94 39 233 107 102 97 92 243 110 105 100 95 253 113 108 103 98 264 116 111 106 101 274 119 114 109 104 285 122 117 112 107 297 125 120 115 110 309 128 123 118 113 321 131 126 121 116 331 134 129 124 119 346 137 132 127 122 359 140 135 130 125 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 as coastal applications See Users Manual for information Edition Date 02 06 Catalog No 25HCR 2SI Replaces 25HCR 1SI
7. D TUBE II A U secon TUBE INSULATION THROUGH THE WALL a OST INSULATION A VAPOR TUBE HANGER STRAP AROUND VAROR TUBE ONLY S o o o Uor 1 MIN gt Lee a LIQUID TUBE SUSPENSION 94028 Fig 2 Connecting Tubing Installation When outdoor unit is connected to factory approved indoor unit outdoor unit contains system refrigerant charge for operation with ARI rated indoor unit when connected by 15 ft 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 INSTALLATION STEP 1 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 STEP 2 Install on a Solid Level Mounting Pad If conditions or local codes require the unit be attached t
8. OD amp SMALLER LARGER THAN 7 IN OD 81032 Fig 4 Position of Sensing Bulb Replacing TXV on Puron Indoor Coil 1 2 Pump system down to 2 psig and recover refrigerant Remove coil access panel and fitting panel from front of cabinet Remove TXV support clamp using a 5 16 in nut driver Save the clamp Remove Puron TXV using a backup wrench on flare connections to prevent damage to tubing Using wire cutters cut equalizer tube off flush with vapor tube inside cabinet Remove bulb from vapor tube inside cabinet Braze equalizer stub tube closed Use protective barrier as necessary to prevent damage to drain pan IMPORTANT Route the equalizer tube of R 22 TXV through suction line connection opening in fitting panel prior to replacing fitting panel around tubing 8 11 12 13 14 15 Install TXV with 3 8 in copper tubing through small hole in service panel Use wrench and backup wrench to avoid damage to tubing or valve to attach TXV to distributor Reinstall TXV support clamp removed in item 3 10 Attach TXV bulb to vapor tube inside cabinet in same location as original was when removed using supplied bulb clamps nylon or copper See Fig 4 for correct positioning of sensing bulb Route equalizer tube through suction connection opening large hole in fitting panel and install fitting panel in place Sweat inlet of TXV marked IN to liquid line Avoid
9. TIONS Over 80 ft Below 55 F Crankcase Heater Yes Yes Evaporator Freeze Thermostat Yes No Winter Start Control Yes No Accumulator No No Compressor Start Assist Capacitor and Relay Yes Yes Support Feet Recommended No Liquid Line Solenoid Valve No See Long Line Application Guideline Conditioners and Heat Pumps using R 22 For Tubing Set lengths between 80 and 200 ft horizontal or 20 ft vertical differential 250 ft Total Equivalent Length refer to the Long Line Guidelines for Air Table 2 Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters in LIQUID VAPOR up to 80 ft UNIT SIZE Connection Diameter Biota Connection Diameter Rated Tube Diameter 018 024 3 8 3 8 5 8 5 8 030 036 3 8 3 8 3 4 3 4 042 048 3 8 3 8 7 8 7 8 060 3 8 3 8 7 8 1 1 8 Notes 1 Tube diameters are for total equivalent lengths up to 80 ft 2 Do not apply capillary tube or fixed orifice indoor coils to these units For Tubing Set lengths between 80 and 200 ft horizontal or 20 ft vertical differential 250 ft Total Equivalent Length refer to the Longline Guideline Air Conditioners and Heat Pumps using R 22 25HCR 25HCR 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 feede
10. ated more than 100 ft 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 STEP 9 Compressor Crankcase Heater When equipped with a crankcase heater furnish power to heater a minimum of 24 hr before starting unit To furnish power to heater only set thermostat to OFF and close electrical disconnect to outdoor unit A crankcase heater is required if refrigerant tubing is longer than 80 ft Refer to the Long Line Guideline Residential Split System Air Conditioners and Heat Pumps STEP 10 Install Electrical Accessories Refer to the individual instructions packaged with kits or accessories when installing STEP 11 Start Up A CAUTION PERSONAL INJURY HAZARD Failure to follow this caution may result in personal injury Wear safety glasses
11. excessive heat which could damage valve Install vapor elbow with equalizer adapter to vapor line of line set and vapor connection to indoor coil Adapter has a 1 4 in male connector for attaching equalizer tube Connect equalizer tube of TXV to 1 4 in equalizer fitting on vapor line adapter Use backup wrench to prevent damage to equalizer fitting Proceed with remainder of unit installation STEP 6 Check Defrost Thermostat 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 5 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 STUB TUBE DEFROST THERMOSTAT A97517 Fig 5 Defrost Thermostat Location STEP 7 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 A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or
12. improper operation If ANY refrigerant tubing is buried provide a 6 in vertical rise at service valve Refrigerant tubing lengths up to 36 in may be buried without further special consideration Do not bury lines longer than 36 in A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation To prevent damage to unit or service valves observe the following e Use a brazing shield e Wrap service valves with wet cloth or use a heat sink material 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 substantial capacity and performance losses can occur Following the recommendations in the Application Guideline and Service Manual Residential Split System Air Conditioners and Heat Pumps 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 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 correct system refrigerant charge for operation with approved ARI rated indoor unit when connected by 15 ft of field supplied or factory acces
13. nnect 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 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 8 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 8 DISCONNECT PERN E C AND OR LOCAL CODES CONTACTOR FIELD POWER O WIRING 2 O 0 0 FIELD GROUND WIRING GROUND LUG A94025 Fig 8 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 9 Use No 18 AWG color coded insulated 35 C minimum wire If thermostat is loc
14. o pad tie down bolts should be used and fastened through knockouts provided in unit base pan Refer to unit mounting pattern in Fig 3 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 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 per compressor manufacturer specifications STEP 3 Clearance Requirements When installing allow sufficient space for airflow clearance wiring refrigerant piping and service Allow 30 in clearance to service end of unit and 48 in above unit For proper airflow a 6 in clearance on 1 side of unit and 12 in on all remaining sides must be maintained Maintain a distance of 24 in between units Position so water snow or ice from roof or eaves cannot fall directly on unit
15. protective clothing and gloves when handling refrigerant and observe the following e Front seating service valves are equipped with Schrader valves A CAUTION ENVIRONMENTAL HAZARD Failure to follow this caution may result in environmental damage 25HCR Federal regulations require that you do not vent refrigerant to the atmosphere Recover during system repair or final unit disposal A CAUTION UNIT OPERATION AND SAFETY HAZARD Failure to follow this caution may result in minor personal injury equipment damage or improper operation To prevent compressor damage or personal injury observe the following e Do not overcharge system with refrigerant e Do not operate unit in a vacuum or at negative pressure e Do not disable low pressure switch in scroll compressor applications e Dome temperatures may be hot Follow these steps to properly start up system 1 After system is evacuated fully open liquid and vapor service valves 2 Unit is shipped with valve stem s front seated closed and caps installed Replace stem caps after system is opened to refrigerant flow back seated Replace caps finger tight and tighten with wrench an additional 1 12 turn 3 Close electrical disconnects to energize system 4 Set room thermostat at desired temperature Be sure set point is below indoor ambient temperature 5 Set room thermostat to HEAT or COOL and fan control to ON or AUTO mode as desired Operate uni
16. r 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 result in equipment damage or improper operation Installation of filter drier in liquid line is required Install Liquid Line Filter Drier Indoor Refer to Fig 7 and install filter drier as follows 1 Braze 5 in liquid tube to the indoor coil 2 Wrap filter drier with damp cloth 3 Braze filter drier to 5 in long liquid tube from step 1 4 Connect and braze liquid refrigerant tube to the filter drier olb _ A05227 Fig 7 Liquid Line Filter Drier STEP 8 Make Electrical Connections A 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 disco
17. rvicing 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 unnecessary turns and bends 4 Leave some slack between structure and unit to absorb vibration 5 When passing refrigerant tubes through the wall seal opening with RTV or other pliable silicon based caulk See Fig 2 6 Avoid direct tubing contact with water pipes duct work floor joists wall 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 2 8 Ensure that tubing insulation is pliable and completely surrounds vapor tube 9 When necessary use hanger straps which are 1 in wide and conform to shape of tubing insulation See Fig 2 10 Isolate hanger straps from insulation by using metal sleeves bent to conform to shape of insulation NOTE Avoid contact between tubing and structure OUTDOOR WALL INDOOR WALL cae rA H l F LIQUI
18. s before checking charge 2 Measure liquid service valve pressure by attaching an accurate gage to service port 3 Measure liquid line temperature by attaching an accurate thermistor type or electronic thermometer to liquid line near outdoor coil 4 Refer to unit rating plate for required subcooling temperature 5 Refer to Table 3 Find the point where required subcooling temperature intersects measured liquid service valve pressure 6 To obtain required subcooling temperature at a specific liquid line pressure add refrigerant if liquid line temperature is higher than indicated or reclaim refrigerant if temperature is lower Allow a tolerance of 3 F 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 STEP 13 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
19. sory tubing and factory supplied filter drier Check 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 6 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 Consult local code requirements Refrigerant tubing and indoor coil are now ready for leak testing This check should include all field and factory joints PISTON PISTON RETAINER A05226 Fig 6 Liquid Service Valve Table 1 Accessory Usage REQUIRED FOR LOW AMBIENT AP REQUIRED FOR LONG LINE APPLICA Accessory PLICATIONS
20. stributor 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 National Electrical Code NEC for special requirements 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 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 se
21. t for 15 minutes Check system refrigerant charge 25HCR TYPICAL HEAT HP THERMOSTAT FAN COIL PUMP 24 VAC HOT 24 VAC COM HEAT STAGE 2 COOL HEAT STAGE 1 LEGEND 24V FACTORY WIRING 24V FIELD WIRING m FIELD SPLICE CONNECTION ETY OUTDOOR THERMOSTAT EMERGENCY HEAT RELAY SUPPLEMENTAL HEAT RELAY Fig 9 Generic Wiring Diagrams See Thermostat Installation Instructions for specific unit combinations O ol 2 _ gt z gt gt C lt gt C_ C j SES O lt J lt gt C C gt oja lt a gt C o EO o 5 gt Ss gt am gt dndaads Lr isd Ga AC C COO O HK32EA003 Speedup Quiet Defrost interval Pins Shift DIP switches Fig 10 Defrost Control A02325 A97413 A05378 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 Cooling On a call for cooling thermostat makes circuits R O R Y and R G Circuit R O energizes reversing valve switching it to cooling position Circuit R Y 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
22. ual length depends on Quiet Shift switch position When Quiet Shift is off only a short 30 second defrost cycle is observed With Quiet Shift ON the speedup sequence is one minute 30 second 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 30 seconds and the fan for 40 seconds If the defrost thermostat is closed a complete defrost cycle is initiated If the Quiet Shift switch is turned on the compressor will be turned off for two 30 second intervals as explained previously 25HCR 25HCR Copyright 2006 Carrier Corp e 7310 W Morris St e Indianapolis IN 46231 Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 10 STEP 12 Check Charge Factory charge and charging method are shown on unit rating plate To check charge in cooling mode refer to Cooling Only Procedure To check charge in heating mode refer to Heating Check Chart Procedure Cooling Only Procedure NOTE If subcooling charging conditions are not favorable charge must be weighed in accordance with unit rating plate 0 6 oz ft of 3 8 in liquid line above or below 15 ft respectively Favorable conditions fall within the ranges given on the charging chart on the outdoor unit plate This system requires charging by the subcooling method 1 Operate unit a minimum of 10 minute
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