Installer`s Guide Heat Pumps Models- 4TWX5
Contents
1. PRINTED FROM 152904 04 PRINTED FROM B152934P05 Be sure power supply agrees with equipment nameplate LEGEND Power wiring and grounding of equipment must comply with local codes Low voltage wiring to be No 18 AWG minimum conductor FACTORY WIRING ODT B must be set lower than ODT A If outdoor thermostats ODT are not used connect W1 to W2 and Wa FIELD WIRING If t stat has a T terminal jumper it to the B terminal 18 BC60D1 2 5 Installer s Guide SUBCOOLING CHARGING IN COOLING ABOVE 55 F OD AMBIENT The Trane company has always recommended installing to match the table or remove refrigerant to lower Trane approved matched indoor and outdoor systems the pressure Again wait twenty 20 minutes for the All Trane split systems are ARI rated with only TXV indoor system conditions to stabilize before adjusting charge systems again When system is correctly charged you can refer to System Pressure Curves in Service Facts to verify typical performance The benefits of installing approved indoor and outdoor split 8 systems are maximum efficiency optimum performance and the best overall system reliability The following charging methods are therefore R 410A REFRIGERANT CHARGING CHART DESIGN SUBCOOLING F prescribed for systems with indoor TXVs 1 Subcooling in the coo2. insure safe operation 7 Indoor coil drain line drains freely Pour water into drain pam AA EE EE DO S TRANE Trane www trane com Uist Fath PERFORMANCE RED TIFIED ARI Standard 210 240 UHP Trane has a policy of continuous product and product data improvement and it reserves the right to change design and specifications without notice 18 BC60D1 2 02 09
3. UNIT SIDE N HEX HEADED VALVE SYSTEM SERVICE VALVE D T LIQUID LINE CONNECTION SERVICE BY 18 BC60D1 2 GAS LINE BALL SERVICE VALVE 1 4 TURN ONLY COUNTERCLOCKWISE FOR FULL OPEN lt POSITION CAP UNIT SIDE OF VALVE PRESSURE TAP PORT GAS LINE CONNECTION GAS LINE SERVICE VALVE ROLLED EDGE TO CAPTIVATE STEM CAP OX HEX HEADED UNIT SIDE OF VALVE SYSTEM SERVICE VALVE SERVICE K GAS LINE CONNECTION pressure tap service port when depressed opens only to the field brazing side of the valve when the valve is in the seated position The liquid line valve is not a back seating valve see WARNING below A WARNING Extreme caution should be exercised when opening the Liquid Line Service Valve Turn valve stem counterclock wise only until the stem contacts the rolled edge See Figures 3 and 5 No torque is required Failure to follow this warning will result in abrupt release of system charge and may result in personal injury and or property damage BRASS GAS LINE SERVICE VALVE The Brass Gas Line Service Valve is shipped in the closed position to hold the factory refrigerant charge The pressure tap service port when depressed opens only to the field brazing side when the valve is in the closed position The Gas Line Service Valve is full open with a 1 4 turn See Figure 4 BRAZING REFRIGERANT LINES 1 Remove lower access
4. TRANE 18 BC60D1 2 Heat Pumps 4TWX5 ALL phases of this installation must comply with NATIONAL STATE AND LOCAL CODES IMPORTANT This Document is customer property and is to remain with this unit information pack upon completion of work These instructions do not cover all variations in systems nor provide for every possible contingency to be met in connection with installation All phases of this installation must comply with NATIONAL STATE AND LOCAL CODES Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser s purposes the matter should be referred to your installing dealer or local distributor A GENERAL A WARNING This information is intended for use by individuals pos sessing adequate backgrounds of electrical and me chanical 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 interpretation of this information nor can it assume any liability in connection with its use NOTICE Trane has always recommended installing Trane approved matched indoor and outdoor systems The benefits of installing approved matched systems are maximum efficiency optimum performance and best over all system reliability A WARNING These units use R 410A refrigerant which operates at 50 to 70 higher pressures than R 22
5. exercise basic safety precautions to avoid the possibility of electric shock 1 Power wiring and grounding of equipment must comply with local codes Power supply must agree with equipment nameplate Install a separate disconnect switch at the outdoor unit Ground the outdoor unit per local code requirements OU Fe CO N Provide flexible electrical conduit whenever vibration transmission may create a noise problem within the structure 6 The use of color coded low voltage wire is recommended to simplify connections between the outdoor unit the thermostat and the indoor unit Table 1 NEC Class II Control Wiring 24 VOLTS 7 Table 1 defines maximum total length of low volt age wiring from outdoor unit to indoor unit and to thermostat 8 Mount the indoor thermostat in accordance with in struction included with the thermostat Wire per appro priate hook up diagram included in these instructions F DEFROST CONTROL The demand defrost control measures heat pump outdoor ambient temperature with a sensor located outside the out door coil 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 differ ence or delta T measurement This delta T measurement is representative of the operating state and relative capac ity of the heat pump system By measuring the change in delta T we can determine
6. 60 TOTAL REFRIGERANT LINE LENGTH FEET SUBCOOLING CHARGING BELOW 55 F OD AMBIENT IN HEATING ONLY 1 The Subcool Charging Method in cooling is not recom 4 Check liquid line temperature and pressure at the mended below 55 F outdoor ambient OD valves to obtain a minimum of 10 F subcooling 2 The only recommended method of charging at outdoor 5 Add charge if a minimum of 10 F subcooling is not obtained ambients below 55 F is to weigh in the charge in the with the nameplate charge plus line length correction heating mode 6 It is important to return in the spring or summer to 3 Use Nameplate charge plus standard charge adders for accurately charge the system in the cooling mode at line length outdoor ambients above 55 F 6 18 BC60D1 2 n nstaller s Guide 4TWX5 OUTLINE DRAWING NOTE ALL DIMENSIONS ARE IN MM INCHES B SERVICE PANEL ELECTRICAL AND REFRIGERANT COMPONENT CLEARANCES PER PREVAILING CODES 1 UNIT SHOULD BE PLACED SO ROOF RUN OFF WATER DOES NOT POUR DIRECTLY ON UNIT AND SHOULD BE AT LEAST 305 12 FROM WALL AND ALL SURROUNDING SHRUBBERY ON TWO SIDES OTHER TWO SIDES UNRESTRICTED F m a 22 2 7 8 DIA HOLE i LOW VOLTAGE 28 6 1 1 8 DIA ieee 22 2 118 DIA HOLE IN
7. Information in the outdoor unit Service Facts and on page 6 1 Determine the most practical way to run the lines 2 Consider types of bends to be made and space limitations NOTE Large diameter tubing will be very difficult to rebend once it has been shaped 3 Determine the best starting point for routing the refrig erant tubing INSIDE OR OUTSIDE THE STRUC TURE 4 Provide a pull thru hole of sufficient size to allow both liquid and gas lines 5 Be sure the tubing is of sufficient length 6 Uncoil the tubing do not kink or dent 7 Route the tubing making all required bends and properly secure the tubing before making connections 8 To prevent a noise within the building structure due to vibration transmission from the refrigerant lines the following precautions should be taken a When the refrigerant lines have to be fastened to floor joists or other framing in a structure use isola tion type hangers b Isolation hangers should also be used when refriger ant lines are run in stud spaces or enclosed ceilings c Where the refrigerant lines run through a wall or sill they should be insulated and isolated d Isolate the lines from all ductwork D SERVICE VALVE OPERATION BRASS LIQUID LINE SERVICE VALVE The Brass Liquid and Gas Line Service Valves are factory shipped in the seated position to hold factory charge The LIQUID LINE SERVICE VALVE ROLLED EDGE TO CAPTIVATE STEM CAP gt
8. size see table on page 7 Es cas 18 99 195 31 28 MR 111 28 24 317 12 48 213 8 39 EG 23 58 s 121 28 64 BASE 4 From Dwg 210152637 Rev 1 CHECKOUT PROCEDURE After installation has been completed it is recommended that the entire system be checked against the following list 1 Refrigerant Line Leak checked 8 Supply registers and return grilles open and 2 Suction Lines and Fittings properly insulated unobstructed J EE GEGEE a SERE es Gee 3 Have all Refrigerant Lines been secured and 9 Return air filter installed isolated properly 10 Thermostat thermometer is accurate Check 4 Have passages through masonry been sealed against a reliable thermometer Adjust per If mortar is used prevent mortar from coming instructions with thermostat into direct contact with copper tubing 11 Is correct speed tap being used Verify tightness of all electrical connects Indoor blower 6 Observe outdoor fan during on cycle for clearance 12 Operate complete system in each mode to and smooth
9. CONTROL BOX BOTTOM FOR ELECTRICAL POWE ie ear LIQUID LINE SERVICE VALVE E 1 D FEMALE BRAZE CONNECTION H F WITH 1 4 SAE FLARE PRESSURE TAP FITTINGS FIG 1 K 0 FOR ALTERNATE ELECTRICAL ROUTING GAS LINE 1 4 TURN BALL SERVICE VALVE DY 1 0 FEMALE BRAZED CONNECTION WITH 1 4 SAE FLARE PRESSURE TAP FITTING MODELS ATWX5018A 1064 41 7 8 946 37 1 4 870 34 1 4 98 3 7 8 219 8 5 8 730 28 3 4 4TWX5024A 1064 41 7 8 946 37 1 4 870 34 1 4 98 3 7 8 219 8 5 8 730 28 3 4 ATWXSOSOA 1267 49 78 946 37 1 4 870 34 1 4 98 3 7 8 219 8 5 8 730 28 3 4 ATWX5036A 1267 49 7 8 946 37 1 4 870 34 1 4 98 3 7 8 219 8 5 8 730 28 3 4 4TWX5042A 1267 49 7 8 946 37 1 4 870 34 1 4 98 219 8 5 8 730 28 3 4 98 98 4TWX5048A 1369 53 7 8 946 37 1 4 870 34 1 4 219 8 5 8 730 28 3 4 4TWX5060A 1369 53 7 8 946 37 1 4 870 34 1 4 219 8 5 8 730 28 3 4 From Dwg D152635 Rev 14 18 BC60D1 2 7 Installer s Guide MOUNTING HOLE LOCATION NOTE ALL DIMENSIONS ARE IN MM INCHES pe 294 11 56 p 171 6 74 DRILL pa PLACES 335 13 19 q 221 8 69 Wo I OO O D 1 ma N 310 12 20 158 6 24 580 22 85 f Q Y DRILL bof 4 PLACES gt i OO 599 23 58 BASE 3 NOTE For model base
10. SOR WILL NOT RUN and apply power by clos ing the system main disconnect switch This will activate the compressor sump heat where used Do not change the Thermostat System Switch until power has been applied for one 1 hour Following this procedure will prevent potential compressor overload trip at the initial start up H OPERATIONAL AND CHECKOUT PROCE DURES Final phases of this installation are the unit Operational and Checkout Procedures which are found in this instruc tion on page 8 To obtain proper performance all units must be operated and charge adjustments made in accordance with procedures found in the Service Facts and on page 6 IMPORTANT Perform a final unit inspection to be sure that factory tubing has not shifted during shipment Adjust tubing if necessary so tubes do not rub against each other when the unit runs Also be sure that wiring connections are tight and wire routing is secure 18 BC60D1 2 n r sn nstaller s Guide I ELECTRIC HEATERS M TROUBLESHOOTING Electric heaters if used are to be installed in the air han dling device according to the instructions accompanying the TROUBLESHOOTING CHART WHAT TO CHECK air handler and the heaters J START CONTROL Some models have quick start components which are fac tory installed For models that do not have factory installed REFRIGERANT Head Pressure Too High start components provisions are made for a field ins
11. Use only R 410A approved service equipment Refrigerant cylinders are painted a Rose color to indicate the type of refriger ant and may contain a dip tube to allow for charging of liquid refrigerant into the system All R 410A systems use a POE oil that readily absorbs moisture from the atmo sphere To limit this hygroscopic action the system should remain sealed whenever possible If a system has been open to the atmosphere for more than 4 hours the compressor oil must be replaced Never break a vacuum with air and always change the driers when opening the system for component replacement For specific handling concerns with R 410A and POE oil reference Retrofit Bul letin TRN APGO2 EN Check for transportation damage after unit is uncrated Re port promptly to the carrier any damage found to the unit To determine the electrical power reguirements of the unit refer to the nameplate of the unit The electrical power available must agree with that listed on the nameplate Please return to service CAUTION UNIT CONTAINS R 410A REFRIGERANT R 410A OPERATING PRESSURE EXCEEDS THE LIMIT OF R 22 PROPER SERVICE EQUIPMENT IS REQUIRED FAILURE TO USE PROPER SERVICE TOOLS MAY RESULT IN EQUIPMENT DAMAGE OR PERSONAL INJURY SERVICE USE ONLY R 410A REFRIGERANT AND APPROVED POE COMPRESSOR OIL Q 5 FT ABOVE UNIT UNRESTRICTED The Weathertron Heat Pump has been designed and manufactured to withs
12. cover to access service valves 2 Before brazing remove plugs from external copper stub tubes Clean internal and external surfaces of stub tubes prior to brazing 3 Cut and fit tubing minimizing the use of sharp 90 bends 4 Insulate the entire gas line and its fittings 5 Do NOT allow uninsulated liquid line to come in direct contact with bare gas line 6 Precautions should be taken to avoid heat dam age to the pressure tap valve core during braz ing It is recommended that the pressure tap port valve core be removed and a wet rag wrapped around the valve body 18 BC60D1 2 Installer s Guide NOTICE Use care to make sure that no moisture enters pressure tap port while wet rag is being used NOTICE Precautions should be taken to avoid heat damage to basepan during brazing It is recommended to keep the flame directly off of the basepan 7 Use a Dry Nitrogen Purge and Brazing Alloy without flux when brazing the field line to the copper factory connection Flow dry nitrogen into either valve pressure tap port thru the tubing and out the other port while brazing 8 Braze using accepted good brazing techniques LEAK CHECK IMPORTANT Replace pressure tap port valve core before attaching hoses for evacuation After the brazing operation of refrigerant lines to both the outdoor and indoor units is completed the field brazed connections must be checked for leaks Pressurize through the service valve ports t
13. he indoor unit and field refrigerant lines with dry nitrogen to 350 400 psi Use soap bubbles or other leak checking methods to see that all field joints are leak free If not release pressure then repair SYSTEM EVACUATION NOTE Since the outdoor unit has a refrigerant charge the gas and liquid line valves must remain closed 1 Upon completion of leak check evacuate the refrigerant lines and indoor coil before opening the gas and liquid line valves 2 Attach appropriate hoses from manifold gauge to gas and liquid line pressure taps NOTE Unnecessary switching of hoses can be avoided and com plete evacuation of all lines leading to sealed system can be accomplished with manifold center hose and con necting branch hose to a cylinder of R 410A and vacuum pump 3 Attach center hose of manifold gauges to vacuum pump 4 Evacuate until the micron gauge reads no higher than 350 microns 5 Close off valve to vacuum pump and observe the micron gauge If gauge pressure rises above 500 microns in one 1 minute then evacuation is incomplete or system has a leak 6 If vacuum gauge does not rise above 500 microns in one 1 minute the evacuation should be complete 7 Blank off vacuum pump and micron gauge close valves on manifold gauge set NOTE DO NOT VENT REFRIGERANT INTO THE ATMOSPHERE NOTE A 3 16 Allen wrench is required to open liquid line service valve A 1 4 Open End or Adjustable wrench is required to
14. ling mode is the only LIQUID recommended method of charging above 55 F ambient temperatures LIQUID GAGE PRESSURE PSI 2 For best results the indoor temperature should be kept between 70 F to 80 F Add system heat if needed eo 195 198 201 204 208 211 215 3 At start up or whenever charge is re 2 eis 218 222 225 229 222 ee UNPA ea ES 229 222 2 240 243 247 251 to stabilize before accurate measurements can be made 80 4 Measure Liquid Line Temperature and Refrigerant Pressure at service valves 90 5 Determine total refrigerant line length 1 41 and height lift if indoor section is above the condenser 381 386 391 6 Determine the Design Subcool Charging Temperature from the unit nameplate 110 429 7 Locate this value in the appropriate col 115 umn of the Subcooling Charging Table 120 464 rg are 452 485 L 495 ser Locate your liguid line temperature in the left column of the table and the intersecting liguid line pressure under Refer to Service Facts or your nameplate subcool value column Installer s Guide for charging method Add refrigerant to raise the pressure From Dwg D154557P01 Rev 2 SUBCOOL CHARGING TABLE CORRECTIONS FOR LINE LENGTH AND RISE Add 10 psig to Subcool Charging Table Pressure Use Design Subcool Value from Table E E Lu Z LU lt w On J xX LL LU m _ O Subtract 10 psig from S C Table Pressure 10 20 25 30 40
15. noying to the customer since conden sate and fog will occur during the defrost cycle 4 Avoid locating the unit under the eaves or other over head structures as sizeable icicles may form and the unit may be damaged by these falling icicles B LOCATION AND PREPARATION OF THE UNIT 1 When removing unit from the pallet notice the tabs on the basepan Remove tabs by cutting with a sharp tool as shown above in Figure 2 and slide unit off of pallet 2 The unit should be set on a level support pad at least as large as the unit base pan such as a concrete slab If this is not the application used please refer to applica tion bulletin Trane XR APG EN denotes latest revision number 3 The support pad must NOT be in direct contact with any structure Unit must be positioned a minimum of 12 from any wall or surrounding shrubbery to insure adequate airflow Clearance must be provided in front of control box access panels and any other side requir ing service access to meet National Electrical Code Also the unit location must be far enough away from any structure to prevent excess roof run off water from pouring directly on the unit Do not locate unit s close to bedroom s 4 The top discharge area must be unrestricted for at least five 5 feet above the unit 5 When the outdoor unit is mounted on a roof be sure the roof will support the unit s weight Properly selected isolation is recommended to prevent transmis
16. open gas line valve A 3 4 Open End wrench is required to take off the valve stem cap 8 The liquid line shut off valve can now be opened Remove shut off valve cap Fully insert hex wrench into the stem and backout counterclockwise until valve stem just touches rolled edge approximately five 5 turns observing WARNING statement on page 3 See Figure 3 Installer s Guide 9 Replace liquid service pressure tap port cap and valve stem cap These caps MUST BE REPLACED to prevent leaks Replace valve stem and pressure tap cap finger tight then tighten an additional 1 6 turn 10 The gas valve can now be opened For a ball type gas valve open the gas valve by removing the shut off valve cap and turning the valve stem 1 4 turn counterclock wise using 1 4 Open End or Adjustable wrench See Figure 4 For brass gas line service valve opening follow 8 and 9 above See Figure 5 11 The gas valve is now open for refrigerant flow Replace valve stem cap to prevent leaks Again these caps MUST BE REPLACED to prevent leaks Replace valve stem and pressure tap cap finger tight then tighten an additional 1 6 turn See Figure 3 If refrigerant lines are longer than 15 feet and or a differ ent size than recommended it will be necessary to adjust system refrigerant charge upon completion of installation See page 6 or the unit Service Facts E ELECTRICAL CONNECTIONS A WARNING When installing or servicing this equipment ALWAYS
17. sion to the building structure 6 The maximum length of refrigerant lines from outdoor to indoor unit should NOT exceed sixty 60 feet 7 If outdoor unit is mounted above the air handler maxi mum lift should not exceed sixty 60 feet suction line If air handler is mounted above condensing unit maxi mum lift should not exceed sixty 60 feet liquid line 8 Locate and install indoor coil or air handler in accor dance with instruction included with that unit C INSTALLING REFRIGERANT LINES A CAUTION If using existing refrigerant lines make certain that all joints are brazed not soldered 2009 Trane Condensing units have provisions for braze connections Pressure taps are provided on the service valves of outdoor unit for compressor suction and liquid pressures The indoor end of the recommended refrigerant line sets may be straight or with a 90 degree bend depending upon situation requirements This should be thoroughly checked out before ordering refrigerant line sets The gas line must always be insulated CAUTION In scroll compressor applications dome temperatures may be hot Do not touch top of compressor may cause minor to severe burning The units are factory charged with the system charge re quired when using fifteen 15 feet of rated connecting line Unit nameplate charge is with twenty five 25 feet of line set Final refrigerant charge adjustment is necessary Use the Charging
18. talled start kit accessory When adding an accessory follow the Head Pressure Too Low Compressor Cycles on IOL instructions provided with the kit Sn Prema To High Suction Pressure Too Low K OUTDOOR TH ERMOSTAT Liquid Rettig Floodback TXV An outdoor thermostat TAYSTAT250B may be field in LD Coil Frosting stalled For data see wiring diagram attached to unit and F ny instruction sheet packaged with outdoor thermostat ELECTRICAL Compressor amp 0 D Fan Jon t Start H L SEACOAST SALT SHIELD Units installed within one mile of salt water including OD Fan Wont Sun 5 seacoasts and inland waterways require the addition of Compressor Huns Bt Went Slat BAYSEAC001 Seacoast Kit at the time of installation IMPORTANT F L D Blower Won t Start DEFROST See Limited Warranty information in Use and Care Manual Unit Won t Initiate Defrost Defrost Terminates on Time Unit Icing Up vllelslelzle C Cooling H Heating Primary Causes S Secondary Causes 3 Phase Only TYPICAL FIELD HOOK UP DIAGRAMS VARIABLE SPEED AIR HANDLER HEAT PUMP AIR HANDLER HEAT PUMP
19. tand and operate in severe winter conditions However there are precautionary steps which should be taken at the time of installation which will help assure the efficient operation of the unit It is recom mended that these precautions be taken for units be ing installed in areas where snow accumulation and prolonged below freezing temperatures occur 1 Units should be elevated three 3 to twelve 12 inches above the pad or rooftop depending on local weather This additional height will allow better drainage of snow and ice melted during defrost cycle prior to its refreezing This should prevent a build up of ice around the unit which occurs when unit is not elevated In sure that drain holes in unit base pan are not obstructed preventing draining of defrost water 2 If possible avoid locations that are likely to accumulate snow drifts If not possible a snow drift barrier should be installed around the unit to prevent a build up of Installer s Guide BASEPAN TAB REMOVAL snow on the sides of the unit and should be of sufficient distance from the unit to prevent restriction of airflow to and from the unit Also allow for proper maintenance space The barrier should be constructed of materials which will blend in with the building design 3 Avoid locating the unit where condensation and freezing of defrost vapor may annoy the customer For instance installing the unit under a bedroom kitchen or picture window may be an
20. the need for defrost The coil sensor also serves to sense outdoor coil temperature for termination of the defrost cycle FAULT IDENTIFICATION 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 sec ond or not at all refer to the service manual for that unit PIN IDENTIFICATION See Figure 6 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 PIN IDENTIFICATION ON N us a FRC_DFT 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 de frost Remove the short after defrost initiates DEFROST CONTROL CHECKOUT Normal operation requires a LED on board flashing 1 time second b 24V AC between R amp 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 refer to the service information in control box G COMPRESSOR START UP After all electrical wiring is complete SET THE THER MOSTAT SYSTEM SWITCH IN THE OFF POSITION SO COMPRES
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