4TWX6_Install Guide
Contents
1. 3 Phase Only L Jus PI 02 05 Trane A business of American Standard Companies www trane com Trane has a policy of continuous product and product data improvement and it reserves the right to change design and specifications without notice2. 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 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 Installer s Guide BASEPAN TAB REMOVAL installing the unit under a bedroom kitchen or picture window may be annoying 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 application bulletin Trane APB2001 02 3 The support pad must NOT
3. 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 With vacuum pump and micron gauge blanked off open valve on R 410A cylinder and charge refrigerant lines and indoor coil with vapor to tank pressure of R 410A supply NOTE DO NOT VENT REFRIGERANT INTO THE ATMOSPHERE 8 Close valve on R 410A supply cylinder Close valves on manifold gauge set and remove refrigerant charging hoses from liquid and gas pressure tap ports 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 open gas line valve A 3 4 Open End wrench is required to take off the valve stem cap 9 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 2 See Figure 3 3 Installers Guide 10 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 11 The gas valve can now be opened Open the gas valve by removing the shut off valve cap and turning the valve stem 1 4 turn counterclockwise using 1 4 Open End or Adjustable wrench See
4. 2 Installers Guide 4TWX6 OUTLINE DRAWING NOTE ALL DIMENSIONS ARE IN MM INCHES SERVICE PANEL ELECTRICAL AND REFRIGERANT COMPONENT CLEARANCES PER PREVAILING CODES B UNIT SHOULD BE PLACED 50 ROOF RUN OFF WATER DOES NOT POUR DIRECTLY ON UNIT AND AT LEAST 305 12 FROM W SURROUNDING SHRUBBERY 0 SHOULD BE ALL AND ALL TWO SIDES OTHER TWO SIDES UNRESTRICTED K ELECTRICAL SERVICE PANEL 777 HOLE 22 2 L TAGE 7 8 DIA LOW VOL 28 6 1 1 8 DIA K O WITH 7 8 DIA HOLE IN CONTROL BOX BOTTOM FOR ELECTRICAL POWER SUPPLY LIQUID LINE SERVICE VALVE EX 1 0 FEMALE BRAZE CONNE WITH 1 4 SAE PRESSURE TAP FIT MODELS ATWX6024B 1118 44 829 32 5 8 756 29 3 4 D ELECT GAS L VALVE WITH 1 TAP F FIG 1 FOR ALTERNATE RICAL ROUTING E 1 4 TURN BALL SERVICE D 1 0 FEMALE BRAZED CONNECTION 74 SAE FLARE PRESSURE TING 143 5 5 8 92 3 5 8 210 8 1 4 79 3 1 8 692 27 1 4 4TWX6036B 1165 45 7 8 4TWX6048B 1267 49 7 8 4TWX6060B 1267 49 7 8 946 37 1 4 946 37 1 4 946 37 1 4 870 34 1 4 870 34 1 4 870 34 1 4 152
5. Figure 4 12 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 4 If refrigerant lines are longer than 15 feet and or a different size than recommended it will be necessary to adjust system refrigerant charge upon completion of installation See unit Service Facts E ELECTRICAL CONNECTIONS A WARNING When installing or servicing this equipment ALWAYS 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 F wo 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 WIRE SIZE MAX WIRE LENGTH 18 AWG 150 FT 16 AWG 225 FT 14 AWG 300 FT 7 Table 1 defines maximum total length of low voltage wiring from outdoor unit to indoor unit and to thermostat 8 Mount the indoor thermostat in accordance with inst
6. driers when opening the system for component replacement Check for transportation damage after unit is uncrated Report promptly to the carrier any damage found to the unit To determine the electrical power requirements of the unit refer to the nameplate of the unit The electrical power available must agree with that listed on the nameplate The Weathertron Heat Pump has been designed and manufactured to withstand 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 being installed in areas where snow accumulation and prolonged below freezing temperatures occur 1 Units should be elevated 3 to 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 Insure that drain holes in 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 ABOVE UNIT UNRESTRICTED
7. fan during on cycle for clearance and smooth operation ccecceeeceeeseeeseceneeeeeeeeseeeenees Indoor coil drain line drains freely Pour water into drain a ea SYSTEM FAULTS 10 12 Supply registers and return grilles open and unobstructed Return air filter installed Thermostat thermometer is accurate Check against a reliable thermometer Adjust per instructions with thermostat Is correct speed tap being used Indoor blower motor Operate complete system in each mode to insure safe operation REFRIGERANT CIRCUIT Head Pressure Too High Head Pressure Too Low Suction Pressure Too High Suction Pressure Too Low Liquid Refrig Floodback Liquid Refrig Floodback Cap Tube 1 0 Coil Frosting Compressor Runs Inadequate or No Cooling Htg ELECTRICAL Compressor amp Fan Won t Start Compressor Will Not Start But Fan Runs Fan Won t Start Compressor Hums But Won t Start Compressor Cycles on IOL 1 Blower Won t Start DEFROST Unit Won t Initiate Defrost Defrost Terminates on Time Unit Icing Up Cooling Heating Primary Causes Secondary Causes
8. 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 isolation 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 LIQUID LINE SERVICE VALVE ROLLED EDGE TO CAPTIVATE STEM CAP gt A UNIT SIDE OF HEX HEADED SERVICE VALVE VALVE SYSTEM SERVICE PORT LIQUID LINE CONNECTION 18 BC55D1 2 GAS LINE SERVICE VALVE 1 4 TURN ONLY COUNTERCLOCKWISE FOR FULL OPEN POSITION un sing 7 OF VALVE PRESSURE TAP PORT GAS LINE CONNECTION COOLING gt gt HEATING D SERVICE VALVE OPERATION BRASS LIQUID LINE SERVICE VALVE The Brass Liquid Line Service Valve is factory shipped in the seated position to hold factory charge The 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 ed
9. 6 98 3 7 8 219 8 5 8 152 6 86 3 3 8 730 28 3 4 98 3 7 8 219 8 5 8 86 3 3 8 730 28 3 4 7 8 3 8 152 6 98 3 7 8 219 8 5 8 86 3 3 8 730 28 3 4 From Dwg 21D152635 Rev 11 18 BC55D1 2 Installer s Guide MOUNTING HOLE LOCATION NOTE ALL DIMENSIONS ARE IN MM INCHES 294 11 56 335 13 19 221 8 69 lo me 482 18 99 599 23 58 310 12 20 s BASE 3 158 6 24 DRILL 4 PLACES 2 48 213 8 39 O Ol 599 23 58 1 28 64 NOTE For model base size see table on page 6 BASE 4 From Dwg D152637 Rev 1 18 BC55D1 2 7 Installers Guide After installation has been completed it is recommended that the entire system be checked against the following list 1 8 2 3 2 TRANE CHECKOUT PROCEDURE Refrigerant Line Leak checked Suction Lines and Fittings properly insulated Have all Refrigerant Lines been secured and isolated properly Have passages through masonry been sealed If mortar is used prevent mortar from coming into direct contact with copper tubing Verify tightness of all electrical connects Observe outdoor
10. S TRANE 18 BC55D1 2 Heat Pumps 4TWX6 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 Please return to service 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 The following instructions cover 4TWX6 Heat Pump Units NOTICE These outdoor units may be used with indoor units equipped with Thermostatic Expansion Valve only A WARNING These units use R 410A refrigerant which operates at 50 to 70 higher pressures than R 22 Use only R 410A approved service equipment Refrigerant cylinders are painted a Rose color to indicate the type of refrigerant 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 atmosphere To limit this hygroscopic action the system should remain sealed whenever pos sible Never break a vacuum with air and always change the
11. age 8 To obtain proper performance all units must be operated and charge adjustments made in accordance with procedures found in the Service Facts 1 ELECTRIC HEATERS Electric heaters if used are to be installed in the air han dling device according to the instructions accompanying the air handler and the heaters J START CONTROL Some models have quick start components which are factory installed For models that do not have factory installed start components provisions are made for a field installed start kit accessory When adding an accessory follow the instructions provided with the kit K OUTDOOR THERMOSTAT An outdoor thermostat TAYSTAT250A may be field installed For data see wiring diagram attached to unit and instruction sheet packaged with outdoor thermostat L SEACOAST SALT SHIELD All units are shipped with a black Seacoast Salt Shield attached to the access panel Removal of the shield will potentially shorten the life of the joints in the outdoor coil TYPICAL FIELD HOOK UP DIAGRAM VARIABLE SPEED AIR HANDLER E HEAT PUMP Note A OPTIONAL REMOTE NOTE 11 PRINTED FROM DI54050P01 REQUIRED WIRING LEGEND Notes 1 Be sure power supply agrees with equipme
12. 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 requiring 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 transmission to the building structure 6 The maximum length of refrigerant lines from outdoor to indoor unit should NOT exceed eighty 80 feet 7 If outdoor unit is mounted above the air handler maxi mum lift should not exceed twenty five 25 feet suction line If air handler is mounted above condensing unit maximum lift should not exceed twenty five 25 feet liq uid line 8 Locate and install indoor coil or air handler in accor dance with instruction included with that unit C INSTALLING REFRIGERANT LINES CAUTION If using existing refrigerant lines make certain that all joints are brazed not soldered Condensing units have provisions for braze connections Pressure taps are provided on the service valve
13. ed defrost Remove the short after defrost initiates 4 LOW_FAN Low speed Fan test mode Short TEST_COMMON to this pin to force the outdoor fan to low speed When the short is removed the fan will go to high speed for approximately 15 seconds and then return to the speed it was running before the short was applied 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 refer to the service information in control box A WARNING Do NOT connect 24 VAC to T1 ODS A terminal ODS A thermistor WILL BE BLOWN G COMPRESSOR START UP After all electrical wiring is complete SET THE THERMO STAT SYSTEM SWITCH IN THE OFF POSITION SO COMPRESSOR WILL NOT RUN and apply power by closing 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 PIN IDENTIFICATION ON TEST_COMM ae LOW_FAN 18 BC55D1 2 H OPERATIONAL AND CHECKOUT PROCEDURES Final phases of this installation are the unit Operational and Checkout Procedures which are found in this instruction on p
14. ge See Figure 3 No torque is required 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 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 damage to the pressure tap valve core during brazing It is recommended that the pressure tap port valve core be removed and a wet rag wrapped around the valve body 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 18 BC55D1 2 Installer s Guide 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
15. nt nameplate Power wiring and grounding of equipment must comply with local codes Low voltage wiring to be No 18 AWG minimum conductor ODT B must be set lower than ODT A If ODT B is not used connect A Jumper wire from W3 to W2 If ODT A is not used connect a jumper wire from W2 to W1 If electric heat does not have 3rd contactor CH connect a jumper wire from W3 to W2 If electric heat does not have 2nd contactor BH connect a jumper wire from W2 to W1 X2 must be connected to variable speed air handler terminal W3 as shown for proper indoor air flow during the defrost cycle Be sure the jumper between R and BK is cut or removed With O and Y Y2 energized indoor fan is at 80 airflow With 2 and BK energized indoor fan is at 100 airflow Connect only if used with applicable indoor thermostat AIR HANDLER See Note B Refer to Field Hook up Diagrams above 4TWX6 units require 80 airflow with Y1 first stage 100 airflow with Y2 second stage FACTORY WIRING FIELD WIRING Note A The installer must jumper at the LVTB R to O Note B Cut remove the factory installed BK jumper See Figure 1 Connect Y1 from thermostat to Y Y2 at VS Airhandler to Y1 at Outdoor Unit Connect Y2 from thermostat to BK at VS Airhandler to Y2 at Outdoor Unit 18 BC55D1
16. ruc tion included with the thermostat Wire per appropriate 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 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 change in delta T we can determine 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 second or not at all refer to the service manual for that unit PIN IDENTIFICATION See Figure 5 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 Forced Defrost Short TEST_COMMON to this pin for two 2 seconds to initiate a forc
17. s of outdoor unit for compressor suction and liquid pressures 2005 American Standard Inc All Rights Reserved 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 A 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 required when using fifteen 15 feet of connecting line Unit nameplate charge is the same Final refrigerant charge adjustment is necessary Use the Charging Charts in the outdoor unit Service Facts 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 refrigerant tubing INSIDE OR OUTSIDE THE STRUCTURE 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
18. 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 unit is completed the field brazed connections must be checked for leaks Pressurize through the service valve ports the 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 connect ing 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
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