INSTALLATION OPERATION MAINTENANCE
Contents
1. Complete the installation according to the instructions in the following sections of this manual 3 4 PVC OR COPPER TUBING AND FITTINGS QTY MATERIALS m NIPPLE 3 4 NPT TO PVC OR COPPER ADAPTER 2 MIN FROM DWG 21C128186 FIG 1 R1 Page 5 Electrical Wiring AWARN l NG TO PREVENT INJURY OR DEATH DUE TO ELECTRICAL SHOCK OR CONTACT WITH MOVING IN OPEN PARTS LOCK UNIT DISCONNECT SWITCH POSITION BEFORE SERVICING UNIT Electrical Connections Electrical wiring and grounding must be installed in accordance with local codes or in the absence of local codes with the National Electrical Code ANSI NFPA 70 Latest Revision Disconnect Switch Provide an approved weather proof disconnect either on the side of the unit or within close proximity and within sight of the unit Over Current Protection The branch circuit feeding the unit must be protected as shown on the unit rating plate Power Wiring The power supply lines must be run in weathertight conduit to the disconnect and into the bottom of the unit control box Provide strain relief for all conduit with suitable connectors Provide flexible conduit supports whenever vibration trans mission may cause a noise problem within the building struc ture Ensure all connections are made tight See Figures 5 and 6 Typical Field Wiring Diagrams NOTES 1 For branch circuit wiring main power supply to the unit disconnect wire siz2. lt Typical Field Wiring Diagram TYPICAL MANUAL THERMOSTAT WCH024 030 036 042C Units With Supplementary Heaters PACKAGED AIR CONDITIONER 36B BL COMMON 47A BK FAN 44A YL COMPRESSOR 41A BR ELECTRIC HEAT 40A OR SWITCHOVER VALVE 48A BR DEFROST CONTROL T SIGNAL 35A RD 24V SUPPL HTR CONTROL BOX 17 28 KW 1 PH HEATER FUSE BOX FACTORY PROVIDED GROUNDING WRE GROUNDING WIRE apt 1 PH POWER SUPPLY S 3 PH POWER SUPPLY AND CIRCUIT PROTECTION DISCONNECT PER LOCAL CODES NOTES 1 FUSED DISCONNECT SIZE POWER WIRING AND GROUNDING OF EQUIPMENT MUST COMPLY WITH LOCAL CODES 2 BE SURE POWER SUPPLY AGREES WITH EQUIPMENT AND HEATER NAMEPLATE LOW VOLTAGE WIRING TO BE NO 18 AWG MINIMUM CONDUCTOR SEE HEATER NAMEPLATE FOR CURRENT RATING OF HEATER USED SEE UNIT AND HEATER DIAGRAM FOR ELECTRICAL CONNECTION DETAILS SUPPL HTR POLARIZED x p POG CONTROL BOX 5 PH POWER SUPPLY F TI PACKAGED AIR CONDITIONER 3 PH POWER SUPPLY THRU FUSED DISCONNECT PER LOCAL CODES HEATER FUSE BOX GROUND WIRE INTER COMPONENT WIRING FACTORY WIRING 2A4V e m E V ogy FIELD L
3. change in delta T we can determine the need for defrost The coil sensor also serves to sense outdoor coil temperature for termina tion of the defrost cycle FAULT DETECTION A fault condition is indicated by the flashing light on the defrost control inside the heat pump control box In normal operation the defrost control light will flash once each second If the light is flashing more than once per second or not at all refer to the service manual for that unit PIN IDENTIFICATION See Figure 1 TEST_COMMON Shorting any of the other pins to this pin causes the function of the other pin to be executed Leaving this pin open results in the normal mode of operation 2 TST Test Shorting TEST_COMMON to this pin speeds up all defrost board timings 3 FRC_DFT Forced Defrost Short TEST_COMMON to this pin for two 2 seconds to initiate a forced defrost Remove the short after defrost initiates PROCEDURE FOR TESTING SENSORS Demand Defrost System PIN IDENTIFICATION FRC_DFT O a TEST_COMMON oO TST DEFROST CONTROL CHECKOUT Normal operation requires a LED on board flashing 1 time second b 24V AC between R amp B c 24V AC between Y amp B with unit operating d Defrost initiation when FRC_DFT pin is shorted to TEST_COMMON pin If a defrost control problem is suspected proceed to DEMAND DEFROST CONTROL CHECKOUT in this Service Facts A WAR N l NG Do NOT connect 24 VAC to T1 ODS A termin
4. The optional automatic changeover thermostat when in the AUTO position automatically changes to heat or cool with sufficient room temperature change The fan switch can be placed in either the ON position causing continu ous evaporator indoor fan operation or the AUTO position causing fan operation to coincide with heating or cooling run cycles Continuous fan mode during cooling operation may not be appropriate in humid climates If the indoor air exceeds 60 relative humidity or simply feels uncomfortably humid it is recommended that the fan only be used in the AUTO mode COOLING MODE NOTE TSH amp TSC are contacts internal to the indoor thermo stat With the disconnect switch in the ON position current is sup plied to the compressor crankcase heater and control trans former The outdoor fan relay ODF relay is energized through normally closed contacts on the defrost timer control DFC on the 460V and 600V units only The cooling cycle is enabled through the low voltage side of the control transformer to the R terminal on the indoor thermostat With the system switch in the AUTO position and TSC 1 contacts closed power is supplied to the O terminal on the indoor thermostat to the switchover valve coil SOV This energizes the switch over valve SOV and places it in the cooling position it is in the heating position when not energized When the indoor temperature rises 1 1 2 degrees TSC 2 con tacts clo
5. indoor thermostat and to the supplementary heater control circuit NOTE The fan relay F must have been ener gized An outdoor thermostat may have been added to disallow the second stage if provided of electric heat above a selected outdoor temperature If the outdoor temperature falls below the setting on the outdoor thermostat this additional heater stage Page 8 will come on When the outdoor air temperature rises and the outdoor T stat setpoint is reached the system will revert back to first stage electric heating When the indoor ambient is satisfied TSH 2 contacts will open and the unit will revert back to the compressor only heating mode and then off For emergency heat use of supplementary electric heat only an emergency EMERG heat switch is provided within the thermostat When placed in the emergency heat position it will disable the compressor bypass the outdoor thermostats if provided and engage the supplementary electric heaters and indoor fan DEMAND DEFROST OPERATION During the heating cycle the outdoor coil may require a defrost cycle which is determined by the demand defrost control DFC This control continuously measures the outdoor coil tempera ture CBS and the outdoor ambient temperature ODS B and calculates the difference or delta T measurement When the calculated delta T is met the demand defrost control DFC opens the circuit to the outdoor fan motor ODM and energizes the switch over val
6. D OR EQUAL WITH PITCH PANS Typical Rooftop Application RETURN AIR INSULATED SUPPLY AIR INSULATED eIf duct hood or supply and return ducts are fabricated by the installing contractor be sure that the portion of the supply and return ducts located outdoors is as short as possible The supply duct return duct and connectors should be insulated with 2 insulation and weatherproofed Be sure the openings in the structure for the supply and return ducts are large enough to include the insulation Use turning vanes inside the supply and return ducts when using a square elbow take off from the unit e Vibration isolators are recommended to prevent transmission of vibration to the structure Isolate with at least four 4 vibration isolators or equivalent The isolators must provide a minimum clearance of 1 4 beneath the unit to permit air to circulate under the unit s base Condensate Drain Piping A 3 4 inch female NPT condensate drain connection is provided on the evaporator end of the unit See Figure 1 Provide a trap and fill it with water before starting the unit to prevent air from being drawn through Follow local codes and standard piping practices when running the drain line Pitch the line downward away from the unit Avoid long horizontal runs See Figure 6 NOTE Do not use reducing fittings in the drain line The condensate drain must be Made of 3 4 pipe e Pitched 1 4 per foot to provide free dr
7. INE y J WIRING pape 1 PH POWER SUPPLY THRU FUSED DISCONNECT PER LOCAL CODES B757386 Dwg No D757386 Maintenance Routine Maintenance by Owner You can do some of the periodic maintenance functions for your WCH B unit yourself These functions include replacing the disposable or cleaning the permanent air filters cleaning the unit s cabinet cleaning the condenser coil and conducting a general inspection of the unit on a regular basis AWARNING TO PREVENT INJURY OR DEATH DUE TO ELECTRICAL SHOCK OR CONTACT WITH MOVING IN OPEN PARTS LOCK UNIT DISCONNECT SWITCH POSITION BEFORE SERVICING UNIT Air Filters elt is very important to keep the central duct system air filters clean Be sure to inspect them at least once each month when the system is in constant operation In new construction check the filters every week for the first four 4 weeks elf you have disposable type filters replace them with new filters of the same type and size Do not try to clean disposable filters Clean permanent type filters by washing them with a mild detergent and water Make sure that the filters are thoroughly dry before re installing them in the unit eReplace permanent filters annually if washing fails to clean them or if they show signs of deterioration Use the same type and size as was originally installed Outdoor Coil Unfiltered air circulated through the unit s outdoor coil can cause the coil s surface to b
8. INSTALLATION OPERATION MAINTENANCE Models WCH024C1 WCH042C1 WCH030C1 WCHO048F 1 WCH036C1 WCH060F1 18 BB33D6 6 Single Packaged Heat Pump Over Under 2 2 1 2 3 3 1 2 4 5 Tons IMPORTANT This Document is customer property andisto remain with this unit Please return to service information pack upon completion of work WARNING HAZARDOUS VOLTAGE DISCONNECT POWER BEFORE SERVICING ALL phases of this installation must comply with NATIONAL STATE and LOCAL CODES These instructions do not purport to cover all variations in systems nor to provide for every possible contingency to be met in connection with installation Should further information be desired or necessary or should particular problems arise which are not covered sufficiently for the purchaser s or installer s needs or purposes the matter should be referred to the manufacturer A WARNING THIS INFORMATION IS FOR USE BY INDIVIDUALS HAVING ADEQUATE BACKGROUNDS OF ELECTRICAL AND MECHANI CAL EXPERIENCE ANY ATTEMPT TO REPAIR A CENTRAL AIR CONDITIONING PRODUCT MAY RESULT IN PERSONAL INJURY AND OR PROPERTY DAMAGE THE MANUFACTURER OR SELLER CANNOT BE RESPONSIBLE FOR THE INTERPRE TATION OF THIS INFORMATION NOR CAN IT ASSUME ANY LIABILITY IN CONNECTION WITH ITS USE A CAUTION Reconnect all grounding devices All parts of this product that are capable of conducting electri cal current are grounded If grounding wires screws straps clips nut
9. ainage to a convenient drain system Trapped Not connected to a closed drain system eIfan external drain panisinstalled donot connect the drain pipes Do not trap the external drain pan pipe DISCHARGE AIR SUPPLY AIR INSULATED RETURN AIR INSULATED MOUNTING PADS Typical Gound Level Application eAfter the unit has been properly positioned complete the installation according to the instructions in the following sec tions of this manual Then follow the Start Up procedure on page 7 and the operational check on page 9 of this manual Ground Level Outdoor For ground level installations position the unit on a pad at least two 2 inches larger than the unit on all sides The unit must be level on the pad The pad must not contact the structure Be sure the outdoor portion of the supply and return air ducts are as short as possible The installation should proceed as follows The unit must be isolated with mounting pads The mounting pads must provide a minimum of 1 4 clearance beneath the unit to permit air circulation and prevent corrosion of the base See Figure 3 e Attach the supply and return air ducts to the unit The portion of the supply and return ducts located outdoors must be as short as possible eInsulate any ductwork outside the structure with at least two 2 inches of insulation and weatherproofing Be sure the openings in the structure are large enough to include ducts and insulation
10. al ODS A thermistor WILL BE BLOWN TEMP F RESISTANCE Measure the temperature the subject sensor is exposed to If the sensor is mounted on a 86 7 85K tube place the lead on an Annie A 8 or equiv temperature tester on the same tube near 81 8 85K the sensor and insulate the bulb 75 10 24K 70 11 59K Unplug the sensor and measure the resistance with a good quality ohmmeter Simpson 65 13 14K 260 or equiv Read the value as quickly as possible to prevent the meter current from 59 15 32K changing the resistance reading 55 16 93K Using the chart on the right locate as close as possible the actual sensor temperature 50 19 41K The measured resistance should be relatively close to the resistance value shown in the 45 22 20K chart 41 24 76K E ies 36 28 45K Pn 32 31 84K Sensor temp 19 F 25 37 50K Measured Resistance 46K ohms 19 MK 14 53 94K This sensor is good since the measured value is relatively close to the 10 57 64K chart value 5 67 06K 0 78 05K FLASH RATE INDICATIONS 1 Flash Second Normal operation 2 Flashes Second Fault A Low DT i e Inoperative compressor loss of charge open ambient sensor shorted coil sensor 3 Flashes Second Fault B 20 defrosts terminated on time Fault C High DT i e SOV stuck in heating shorted ambient sensor open coil sensor closed TXV OD motor failure OD fan on in defrost undercharged unit 4 Flashes Second FaultA amp CorA amp B For additional informa
11. application Commercial use is any application where the end purchaser uses the product for other than personal family or household purposes The limited warranties displayed in this publication and or on ComfortSite may not accurately reflect the actual limited warranty that shipped with the product 26 1000 21 The manufacturer has a policy of continuous product improvement and it reserves the right to change the specifications and design without notice Trane 6200 Troup Highway C US Tyler TX 75703 Page 13
12. d securely located and level with the proper clearance els the ductwork correctly sized run taped insulated and weatherproofed with the proper unit arrangement els the condensate line properly sized run trapped and pitched Does it drain freely els the filter of the correct size and number Are the supply and return registers unobstructed els the wiring properly sized and run according to the Unit Wiring Diagram Figures 5 and 6 els the power supply correct for the unit s requirements Are all wiring connections including those in the unit itself tight els the thermostat well located level correctly wired and accurately adjusted Do the outdoor fan and the indoor fan turn free without rubbing Are both fans tight on their shafts Has the indoor blower speed tap been determined and the proper speed set See the Unit Wiring Diagram Figures 5 and 6 e Has all work been done in accordance to the applicable local and national codes e Are all cover and access panels in place to prevent air loss and to protect against safety hazards e Have all tools and debris around on top of and under the unit been removed Starting the Unit In the Cooling Mode IMPORTANT Before starting the system in the cooling cycle turn the thermostat switch to OFF and close the unit disconnect switch This procedure energizes the compressor crankcase heat if equipped thereby vapor izing any liquid HCFC 22 in the crank
13. d was released to the transportation agency without known damage Inspect the exterior of the carton for evidence of rough handling in shipment Check the unit nameplate to determine if the unit is correct for the intended application After moving the equipment to the approximate location unpack it carefully If damage to the unit is found report the nature of this damage immediately to the delivery agency Check to be sure that the refrigerant charge has been retained during shipment Power Supply The power supply must be adequate for the unit and any supplementary electric heaters ifadded Make certain that the power supply to the unit agrees with the power requirements specified on the unit nameplate Separate branch circuits are required for supplementary electric heaters Rigging IMPORTANT Check the handling facilities to ensure the safety of both personnel and the unit Be sure that the proper method of rigging is used with straps or slings and spreader bars for protection during lifting A WARNING Safety Warning Do not lift the unit without testing for balance and rigging Do not lift the unit in windy condi tions or above personnel Do not lift the unit by attaching a clevis hooks pins or bolts to the unit casing casing hardware corner lugs angles tabs or flanges Failure to observe this warning may result in equipment damage Locations and Recommendations This unit was designed for multiple applications roofto
14. e for the length of run should be determined using the circuit ampacity found on the unit nameplate and the N E C 2 For more than 3 conductors in a raceway or cable see the N E C for derating the ampacity of each conductor 3 Wire size is based on 75 degrees C rated wire insulation Grounding The unit must be electrically grounded in accordance with local codes or the National Electrical Code Accessories All electrical accessories must be installed and wired according to the instructions packaged with the accessory Control Wiring Class Il eLow voltage control wiring should not be run in the same conduit with the power wiring unless Class I wire of the proper voltage rating is used Route the thermostat cable or equivalent single leads of No 18 AWG colored wire from the thermostat subbase terminals through the rubber grommet on the unit See Figure 1 for the control entry location Make connections as shown on the unit wiring diagram and in Figures 5 and 6 Page 6 Electrical Wiring Do not short thermostat wires since this will damage the control transformer Recommended wire sizes and lengths for installing the unit thermostat are provided in Table 1 Thermostat Wire Size and Maximum Length The total resistance of these low voltage wires must not exceed one 1 ohm Any resistance in excess of one 1 ohm may cause the control to malfunction because of the excessive voltage drop eIMPORTANT Upon com
15. ease This is a precaution against foaming at start up which could dam age the compressor Allow the heat to operate for a minimum of eight 8 hours The WCH048 060F units do not have sump heat as shipped NOTE The crankcase heater is a field installed option on some models NOTE See the section on Sequence of Operation for a descrip tion of the cooling operating sequence eTo start the unit in the cooling mode set the thermostat system switch to COOL Move the thermostat COOL in dicator to a setting below room temperature The outdoor fan motor compressor and evaporatorfan motor will oper ate automatically Start Up Operating Pressures After the unit has operated in the cooling mode for a short time install pressure gauges on the gauge ports of the discharge and suction line valves Check the suction and discharge pressures and compare them to the normal operating pressures provided in the unit s SERVICE FACTS Voltage With the compressor operating check the line voltage at the unit The voltage should be within the range shown on the unit nameplate If low voltage is encountered check the size and length of the supply line from the main disconnect to the unit The line may be undersized for the length of the run Cooling Shut Down Place the system selector switch in the OFF position or reset the thermostat at a setting above the room tempera ture Do not de energize the main power disconnect except whe
16. ecause of a manufacturing defect within five years from the date of original purchase Warrantor will furnish without charge the required replacement compressor and or outdoor coil Any local transportation related service labor diag nosis calls refrigerant and related items are not included This limited warranty does not cover failure of your Heat Pump if it is damaged while in your possession damage caused by unreasonable use of the Heat Pump and or damage from failure to properly maintain the Heat Pump as set forth in the Use and Care manual see Proper Maintenance section THE LIMITED WARRANTY AND LIABILITY SET FORTH HEREIN ARE IN LIEU OF ALL OTHER WAR RANTIES AND LIABILITIES WHETHER IN CONTRACT OR IN NEGLIGENCE EXPRESS OR IMPLIED IN LAW OR IN FACT INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR USE AND IN NO EVENT SHALL WARRANTOR BE LIABLE FOR ANY INCIDEN TAL OR CONSEQUENTIAL DAMAGES Some states do not allow limitations on how long an implied limited warranty lasts or do not allow the exclusion or limi tation of incidental or consequential damages so the above limitation or exclusion may not apply to you This limited warranty gives you specific legal rights and you may also have other rights which vary from state to state Parts will be provided by our factory organization through an authorized service organization in your area listed in the yellow pages If you wish further help or information concerni
17. ecome clogged with dust dirt etc To clean the coil stroke the coil surface with a soft bristled brush vertically that is in the direction of the fins e Be sure to keep all vegetation away from the outdoor coil area Maintenance Performed by Serviceman To keep your unit operating as designed the manufacturer recommends that a qualified serviceman check over the entire system at least once each year as well as any other time that you feel that one is needed Your serviceman should examine and inspect filters for cleaning or replacement motors and drive system components condenser coils for cleaning esafety controls for mechanical cleaning electrical components and wiring for possible replace ment and or connection tightness condensate drain for cleaning unit duct connections to see that they are physically sound and sealed to the unit casing unit mounting support to see that it is sound unit to see that there is no obvious unit deterioration Page 9 DEFROST CONTROL The demand defrost control measures heat pump outdoor ambient temperature with a sensor located outside the outdoor coil A second sensor located on the outdoor coil is used to measure the coil temperature The difference between the ambient and the colder coil temperature is the difference or delta T measurement This delta T measurement is representative of the operating state and relative capacity of the heat pump system By measuring the
18. iring for miswire 1 B to T greater than 10 volts Check for short in low voltage wiring 1 24V R B at board amp 24V Y B at board ON Repair low voltage wi 2 Check protective devices in YO circuit 24V YO B present after 30 seconds Check voltage between control terminals 2 and 7 force a defrost cycle Is 24V present for 30 seconds and OV thereafter 12 On SCROLL bearing units compressor does not operate ing Y B signal or control may be intermittent 13 On SCROLL bearing units no 30 second off delay at defrost initiation Replace defrost control Page 11 Limited Warranty Heat Pump 2 4WCC3 WCD WCH WCK WSC Parts Only sm Models Less Than 20 Tons for Residential Use This limited warranty is extended by Trane U S Inc to the original purchaser and to any succeeding owner of the real property to which the Heat Pump is originally affixed and applies to products purchased and retained for use within the U S A and Canada If any part of your Heat Pump fails because of a manufacturing defect within five years from the date of the original purchase Warrantor will furnish without charge the required replacement part Any local transportation related ser vice labor diagnosis calls refrigerant and related items are not included If the sealed motor compressor fails or if the outdoor coil should become defective either or both events occurring b
19. ity of the unit e Avoid locating the unit where snow drifts This will reduce the times when it is necessary to remove snow from around the unit Snow accumulations should be removed from the sides of the unit for best efficiency Consider installing a snow drift barrier around the unit This will prevent a build up of snow on the sides of the unit The barrier should be of sufficient distance from the unit to prevent Page 2 restriction of airflow to and from the unit eLocate the unit so that the water vapor discharges upward during the defrost cycle and does not condense on windows and fog them or cause icicles to form on the roof overhangs Elevation minimums must be observed for drain line trap and ventilation to the under side of the unit All duct work inside the structure should be adequately insu lated e All duct work outside of the structure must be insulated and weatherproofed in accordance with local codes If supplemen tary heat is added the duct connectors should be of a flame retardant material e Access and service clearances for the unit must be given careful consideration when locating the duct entrance openings Figure 1 provides unit dimensions e All fabricated outdoor ducts should be as short as possible e Be sure the hole s in the structure is large enough to accommo date the ducts and the insulation surrounding them See Figure 1 For outdoor ground level applications the unit mus
20. n the unit is to be serviced Power is required to keep the compressor crankcase heat if equipped energized and boil off refrigerant in the compressor Starting the Unit in the Heating Mode NOTE See the section on Sequence of Operation for a descrip tion of the heating operating sequence eCheck to make sure that all grilles and registers are open and all unit access doors are closed before start up eTo start the unit in the heating mode set the thermo stat system switch to HEAT Move the thermostat HEAT in dicator to a setting above room temperature and place the fan switch in the AUTO or ON positions The indoor fan motor will operate automatically e The thermostat must provide a G signal for fan operation If using an auto changeover thermostat see Figures 5 and 6 for the appropriate connections Heating Shut Down Place the system selector switch to the OFF position or place the heating selector lever at a setting below the room temperature The following warning complies with State of California law Proposition 65 WARNING thi i This product contains fiberglass wool insulation Fiberglass dust and ceramic fibers are believed by the State of California to cause cancer through inhalation Glasswool fibers may also cause respiratory skin or eye irritation Page 7 Sequence of Operation GENERAL Operation of the unit heating and cooling cycles is automatic for HEAT and COOL functions
21. nates in less than 10 seconds Replace defrost control 6 Defrost initiates manually but 1 Coil sensor circuit open or reading at a very Repl il terminates on time high resistance eplace coll sensor 2 Does OD fan cycle off in defrost Replace defrost control 3 Windy weather preventing normal termination 7 Defrost initiates on approximately Be sure OD coil is clean Complete Check 2 15 25 minute intervals 1 Coil sensor open or reading a very high resistance Replace coil sensor Complete Check 3 2 Ambient sensor reading less than normal Replace ambient sensor 3 OD fan off in defrost Replace defrost control 8 Defrost initiates on approximately 30 45 minute intervals 1 TEST_COMMON pin shorted to TST pin Remove short Replace defective sensor Clear coil and 2 Do both sensors check OK reset Emergency heat light Complete SYMPTOM 3 3 Verify correct system charge Adjust as needed 4 Verify a forced defrost terminates less than 15 minutes 5 OD fan motor off in defrost See SYMPTOM 9 Replace defrost control 6 Verify proper SOV operation Replace if necessary 9 OD fan runs during defrost Replace defrost control 10 No SOV delay on defrost The soft switch time is defeated when J1 termination Has J1 been cut is cut Replace defrost control 11 ODS A burned out Check low voltage w
22. ng this limited warranty contact Trane P O Box 9010 Tyler TX 75711 9010 Attention Manager Field Operations Excellence Or visit our website www trane com residential TW 1004 4707 This limited warranty is for residential usage of this equipment and not applicable when this equipment is used for a commercial application A commercial use is any application where the end purchaser uses the product for other than personal family or household purposes The limited warranties displayed in this publication and or on ComfortSite may not accurately reflect the actual limited warranty that shipped with the produc 26 1000 21 Page 12 Limited Warranty High Efficiency Heat Pump AWNCZ6 4WCY4 2 4WCC3 2 4WCX3 WCZ WCD WCH WCK WSC Parts Only Models Less Than 20 Tons for Commercial Use This warranty is extended by Trane U S Inc to the original purchaser and to any succeeding owner of the real prop erty to which the Heat Pump is originally affixed and applies to products purchased and retained for use within the U S A and Canada There is no warranty against corrosion erosion or deterioration If any part of your Heat Pump fails because of a manufacturing defect within one year from the date of the original purchase Warrantor will furnish without charge the required replacement part In addition if the sealed motor compressor fails because of a manufacturing defect within the second through fifth year from the da
23. p out door ground level For proper installation the following recom mendations must be considered eInstallation of the unit should conform to local building codes or in the absence of local codes to the National Electrical Code Canadian installations must conform to CSA and local codes Select a location that will permit unobstructed airflow into the outdoor coil and away from the fan discharge The discharge air from the outdoor fan must be unrestricted for a minimum of three 8 feet above the unit Any reduction of the unit clearances recommended may result in condenser coil starvation or the recirculation of warm condenser air Actual clearances which are inadequate should be reviewed with a local sales represen tative Ifthe unit is located under an overhang provisions must be made to deflect the warm discharge air from under the overhang See Figures 1 2 and 5 The unit must also be situated to permit easy and unrestricted access for service eInstall internal accessories to the unit at the shop if practical Position the unit so roof run off water does not pour directly onto the unit CAUTION MUST ALWAYS BE TAKEN TO AVOID PER SONAL INJURIES AND OR DAMAGE TO THE EQUIPMENT eIn locations with deep snows raise the unit a minimum of 12 inches off the deck slab or pad This will reduce the chance of the coil being blocked snow The water that occurs during the defrost cycle has a better chance of flowing from the vicin
24. pletion of wiring check all electrical connections including factory wiring within the unit Make sure all connections are tight Replace and secure all electrical box covers and access doors before leaving the unit or turning on the power to the unit eAfter all electrical wiring is complete set the thermostat system switch on the OFF position so that the compressor will not run and then apply power by closing the system main disconnect switch This will activate the compressor sump heat Do not change the Thermostat System Switch until power has been applied long enough to evaporate any liquid HCFC 22 in the compressor It is recommended that the sump heat be energized for a minimum of eight 8 hours prior to starting the unit Table 1 Thermostat Wire Size and Maximum Length WIRE SIZE MAXIMUM LENTGH Ft Air Filters e These units require filters with adequate filter area be pro vided in the return air duct Table 2 below gives filter data The specific location of the filters depends on the type of installation and the layout of the duct system Be sure the owner is aware of the location of the filter and the need to change them as required The Filter Size Sq Ft are based on 300 F P M face velocity If permanent filters are used size per mfg recommen dation with clean resistance of 05 WC CFM Sq Ft SIZE RESISTANCE 800 Table 2 Filter Data Start Up Pre Start Quick Check List els the unit properly an
25. s or washers used to complete a path to ground are removed for service they must be returned to their original position and properly fastened 2 2 1 2 3 3 1 2 Tons Shown A CAUTION CONTAINS REFRIGERANT SYSTEM CONTAINS OIL AND REFRIGERANT UNDER HIGH PRESURE RECOVER REFRIGERANT TO RELIEVE PRESSURE BEFORE OPENING SYSTEM Failure to follow proper procedures can result in personal illness or injury or severe equipment damage The manufacturer has a policy of continuous product and product data improvement it reserves the right to change design and specification without notice 2008 Trane General Information These instructions cover installation operation and mainte nance of all single package WCH air conditioning units For an easy and orderly installation follow the sequence of instructions as they are outlined Improper installation can result in unsat isfactory operation and or dangerous conditions as well as make the related warranty inapplicable Read this manual carefully before installing operating or performing maintenance on this unit Installation and maintenance should be performed by qualified service technicians Locate the unit in accordance with local codes or the National Electrical Code Each unit contained an operating charge of HCFC 22 when shipped Unit Inspection The material in this shipment has been inspected at the factory an
26. se supplying power to the Y terminal on the indoor thermostat and to the compressor contactor CC This starts the outdoor fan motor and compressor The TSC 2 contacts also provide power to the G terminal which provides power to the fan relay F starting the indoor fan motor HEATING MODE With the disconnect switch in the ON position current is supplied to the compressor crankcase heater and control trans former The outdoor fan relay ODF is energized through normally closed contacts on the defrost timer control DFC on the 460V and 600V units Starting at the R terminal on the indoor thermostat current goes through the system switch which is in AUTO position to the TSH 1 contacts When closed these contacts supply power to terminal Y on the indoor thermostat as well as to the heating anticipator The switch over valve will not energize because of the high resistance of the heating anticipator in the thermostat Power is provided from Y tothe compressor contactor CC which starts the outdoor fan motor and compressor The indoor thermostat contact TSH 1 also provides power to G terminal on the indoor thermostat energizing the fan relay F which starts the indoor fan motor SUPPLEMENTARY HEAT The supplementary electric heat is brought on when the indoor temperature drops 1 1 2 degrees below the thermostat setting TSH 2 contacts close providing power to the W termi nal on the
27. t 1771 4mm 6 3 4 9 Amm 3 3 41 TYP 19mm 3 4 CONDENSER COIL REFRIGE e 76mm 34mm 3 3 4 TYP co CONTROL BOX ACCESS PANEL 40 PVC PIPE UNIT POWER WIRING CONTROL WIRING LEFT SIDE RIGHT SIDE 23 321 INSTALLATION SERVICE CLEARANCE N CONNECTION 119 63mm 4 AA NUN 7 J FEMALE SCHED C10 1 321 DRA 254 7mm BASE OF UNIT 492mm C19 3 8 29 1 4 5 O m S 9 o I C13 1 4 43mm C1 9 32 NOTE 3 4 SUPPORT RAILS LOCATED UNDERNEATH W AA ANNUAL NA 9mm 3 4 TYP it D Un 33 1 8 ONDENSER coll 57mm 2 1 4 506 6mm 19 15 16 POWER ENTRY SUPPLEMTARY HEATER H V APPROX CORNER WTS LBS WCH048F 128 WCHO60F 115 Installation Applications Roof Top For roof top installations the roof must have sufficient struc tural strength to support the load FHA approved construction and local codes are normally adequate provided the roof joists and rafters have a proportionally distributed load See Figure 2 The unit should be positioned for recommended clearances as previously outlined under Location and Recommendations DISCHARGE AIR INTAKE AIR ALL SIDES MOUNTING PADS CURBING FLASHING AND WEATHER PROOFING MUST MEET NATIONAL AND LOCAL BUILDING CODES 4 x 4 REDWOO
28. t be mounted on a solid level foundation that is not adjoined to the structure because sound and vibration may otherwise be transmitted to the structure Field supplied mounting pads should be used beneath the unit to prevent transmission of vibration to the occupied structure Select a location that will minimize the length ofthe supply and return ducts Select a location where external water drainage cannot collect around the unit Give consideration to shade appearance and noise Unit Dimensions and Clearances WCH024 042C Outline CONDENSER COIL SUPPLY OPENING RETURN OPENING 33mm 1 5 16 DRAIN HOLE REFRIGERANT GUAGE CONNECTIONS INSTALLATION SERVICE CLEARANCE BACK gg ame LEFT SIDE 3 m oan PAN CONNECT 19mm E 3 4 1 FEM RIGHT SIDE Som i 12 4mm 4 7 8 TON ALE NPT 260mm 171mm 10 174 6 3 4 1 375 DIA K O SUPPLEMENTARY HEATE R POWER ENTRY 75 DIA HOLE FOR 0 L POWER ENTRY 8 v CONTROL BOX ACCESS CONDENSER COIL Dwg No D673590 Rev 0 d Clearances imensions an C4 9 321 TYP L 109mm RANT GUAGE NNECTIONS 31 TYP
29. te of original purchase Warrantor will furnish without charge the required replacement compressor Warrantor s obligations and liabilities under this warranty are limited to furnishing F O B Warrantor factory or ware house replacement parts for Warrantor s products covered under this warranty Warrantor shall not be obligated to pay for the cost of lost refrigerant No liability shall attach to Warrantor until products have been paid for and then liability shall be limited solely to the purchase price of the equipment under warranty shown to be defective THE WARRANTY AND LIABILITY SET FORTH HEREIN ARE IN LIEU OF ALL OTHER WARRAN TIES AND LIABILITIES WHETHER IN CONTRACT OR IN NEGLIGENCE EXPRESS OR IMPLIED IN LAW OR IN FACT INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR USE AND IN NO EVENT SHALL WARRANTOR BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES Some states do not allow limitations on how long an implied warranty lasts or do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state Trane P O Box 9010 Tyler TX 75711 9010 Attention Manager Field Operations Excellence TW 1005 4707 This warranty is for commercial usage of said equipment and not applicable when the equipment is used for a residential
30. tion consult Pub No 34 1001 Heat Pump Defrost Controls Page 10 Demand Defrost Control Checkout SYMPTOMS CHECKS YES NO ACTIONS 1 LED off Repair low voltage wiring 1 24V R B amp Y B at board with unit running Complete Check 2 2 Short FRC_DFT pin to TEST_ COMMON pin Replace defrost control Is defrost cycle initiated LED is bad but control will still function 2 LED flashing very rapidly greater than 4 times sec or appears to be on continuously Remove short TEST_COMMON pin shorted to TST pin Replace defrost control 8 Control does not initiate a normal OD Temp below 49 F Check refrigerant circuits for balanced defrost OD Coil temp below 35 F distribution of refrigerant if OD coil is Delta T increasing frosting and delta T is not increasing Refer to SYMPTOM 1 1 LED flashing Complete Check 2 Repair low voltage wiring 2 Check for 24V Y B at board with unit running Complete Check 3 3 Check sensors for correct mounting Remount or replace sensor if necessary connection and resistance 4 Short FRC_DFT pin to TEST_COMMON pin Replace defrost control Is defrost cycle initiated Y B signal or control may be intermittent 4 Control does not initiate a forced Repair low voltage wiring defrost 24V R B amp Y B at board with unit running Replace defrost control 5 Defrost initiates manually but termi
31. ve SOV placing the unit in the cooling mode to defrost the outdoor coilOn SCROLL bearing units only the control will stop the compressor for a minimum of thirty 30 seconds The outdoor coil temperature sensor CBS termi nates the defrost cycle or times off after twelve minutes in defrost the DFC energizes the outdoor fan motor ODM and fifteen seconds later de energizes the SOV which returns the unit to the heating mode Supplementary electric heat if pro vided is brought on to control indoor temperature during the defrost cycle ICM FAN MOTOR ADJUSTMENTS WCH048 060F ONLY If the airflow needs to be increased or decreased see the Airflow Table in the Service Facts Information on changing the speed of the blower motor is in the Blower Performance Table Blower speed changes are made on the ICM Fan Control mounted in the control box The ICM Fan Control controls the variable speed motor There is a bank of 8 dip switches See Figure 5 located at the upper left side of the board The dip switches work in pairs to match the cooling heat airflow CFM TON Fan off delay op tions and electric heat airflow adjustment The switches appear as shown in Figure 5 ICM FAN CONTROL CFM SELECTION DIP LIGHT SWITCHES 21C800796P01 CNTO3600 NC a ce lt a E lt e a z lt o w
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