2TWR2-1N-1B
Contents
1. LD Blower Won t Start gt o Jo alala DEFROST Unit Won t Initiate Defrost Defrost Terminates on Time Unit teing Up C Cooling H Heating P Primary Causes S Secondary Causes 3 Phase Only cL UL Jus Literature Order Number 2TWR2 IN 1B RI 2 03 File Number SV UN S SP 2TWR2 IN 1B TRANE Supersedes 2TWR2 IN 1A Stocking Location PI Louisville amp Webb Mason Houston Trane A business of American Standard Companies Trane has a policy of continuous product and product data improvement and it reserves the right to change www trane com design and specifications without notice2. S TRANE 2TWR2 IN 1B 18 BC51D2 3 Heat Pumps 2TWR1 amp 2TWR2 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 2TWR1 and 2TWR2 Heat Pump Units NOTE These outdoor units may be used with indoor units equipped with Thermostatic Expansion Valve or Accutron Flow Control Check Valve F C C V assembly for refrigerant flow control only 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 pr
3. 65 65 2 5 8 210 8 1 4 57 2 1 4 457 92 92 8 ane lk co M 4 R2030B R2036A R2042A R2048A R2060A S M 4 M wOlalrMm sym RM tN S L 832 32 3 4 724 28 1 2 651 25 5 8 82 3 4 143 5 5 8 Y SeeSee R2024A 8 1 4 57 832 32 3 4 829 32 5 8 756 29 3 4 143 5 5 8 210 8 1 4 79 3 1 8 508 2 8 1 4 79 79 3 8 s 3 832 32 3 4 829 32 5 8 756 29 3 4 143 5 5 8 3 5 8 210 8 1 4 79 3 1 8 508 R E M lM 4 4 i 933 36 3 4 829 32 5 8 756 29 3 4 1 1 8 3 8 143 5 5 8 92 3 5 8 210 8 1 4 79 3 1 8 508 1045 41 1 8 946 37 1 4 870 34 1 4 1 1 8 3 8 152 6 98 3 7 8 219 8 5 8 86 3 3 8 508 From Dwg 21D152898 Rev 9 M 3 gt o 2 eje 6 18 BC51D2 3 Installers Guide MOUNTING HOLE LOCATION Note All dimensions are in MM Inches a 285 110 43 NOTE For model base size 1 see table on page 6 pe THT aw From Dwg 21D152637 Rev 1 18 BC51D2 3 7 Installers Guide After installation has been completed it is recommended that the entire system be checked against the following list CHECKOUT PROCEDURE 1 Refrigerant Line Leak checked sn 2 Suction Lines and Fittings properly insulated 3 Ha
4. All Rights Reserved D INSTALLING REFRIGERANT LINES A 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 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 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 re quired 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 refriger ant 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 Un
5. provided with the kit L OUTDOOR THERMOSTAT An outdoor thermostat TAYSTAT250B may be field installed For data see wiring diagram attached to unit and instruction sheet packaged with outdoor thermostat M SEACOAST SALT SHIELD Units installed within one mile of salt water including seacoasts and inland waterways require the addition of BAYSEAC001 Seacoast Kit at the time of installation IMPORTANT See Limited Warranty information in Use and Care Manual LEGEND FACTORY WIRING FIELD WIRING Installers Guide 2TWR1 amp 2ZTWR2 OUTLINE DRAWING Note All dimensions are in MM Inches waves ere A e Jee RS TWR1024A 651 25 5 8 Sel 127 5 457 G G xi is WR1036A 730 28 3 4 724 28 1 2 651 25 5 8 7 8 3 8 137 5 3 8 65 2 5 8 210 8 1 4 57 2 1 4 457 TWR1042A 832 32 3 4 7 8 3 8 137 5 3 8 86 3 3 8 79 3 1 8 508 832 32 3 4 829 32 5 8 756 29 3 4 1 1 8 3 8 137 5 3 8 86 3 3 8 210 8 1 4 79 3 1 8 508 841 33 1 8 946 37 1 4 870 34 1 4 98 3 7 8 219 8 5 8 508 NZ i Y Y 2 Y 2 4 viv w r Y H j nN Lo mi Kl Y E R1048A R1060A 730 28 3 4 724 28 1 2 651 25 5 8 210 8 1 4 57 2 1 4 457 R2018A
6. CATION 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 7 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 PIN IDENTIFICATION oO O oO Q H T i E a g m me 18 BC51D2 3 MMT TIS ers Guide 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 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 H COMPRESSOR START UP After all electrical wiring is complete SET THE THERMO STAT SYSTEM SWITCH IN THE OFF POSITION SO COMP
7. RESSOR 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 Notes Be sure power supply agrees with equipment nameplate Low voltage wiring to be No 18 AWG minimum conductor ODT B must be set lower than ODT A aah Wh N A to programmable thermostat 18 BC51D2 3 Power wiring and grounding of equipment must comply with local codes If outdoor thermostats ODT are not used connect W1 to W2 and W3 I OPERATIONAL AND CHECKOUT PROCEDURES Final phases of this installation are the unit Operational and Checkout Procedures which are found in this instruction 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 J 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 K 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
8. 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 4 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 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 5 For brass gas line service valve opening follow 9 and 10 above See Figure 6 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 F 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 2 Power supply must agree with equipment
9. coil 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 isolation type hangers LIQUID LINE SERVICE VALVE ROLLED EDGE TO CAPTIVATE STEM CAP gt c UNIT SIDE OF SERVICE VALVE HEX HEADED VALVE SYSTEM SERVICE PORT LIQUID LINE CONNECTION 18 BC51D2 3 1 4 TURN ONLY GAS LINE BALL SERVICE VALVE COUNTERCLOCKWISE ii vo Q FOR FULL OPEN POSITION UNIT SIDE aa OF VALVE PRESSURE TAP PORT GAS LINE CONNECTION CAP BODY COOLING NS bd hd eee ar CT gt HEATING CORE b Isolation hangers should also be used when refriger ant lines are run in stud spaces or enclosed ceilings e Where the refrigerant lines run through a wall or sill they should be insulated and isolated d Isolate the lines from all ductwork E SERVICE VALVE OPERATION BRASS LIQUID AND GAS LINE SERVICE VALVES The Brass Liquid and Gas Line Service Valves are factory shipped in the seated position to hold factory charge The pressure tap service port when depressed opens only
10. d 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 connecting branch hose to a cylinder of HCFC 22 and vacuum pump Installers Guide 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 With vacuum pump and micron gauge blanked off open valve on HCFC 22 cylinder and charge refrigerant lines and indoor coil with vapor to tank pressure of HCFC 22 supply NOTE DO NOT VENT REFRIGERANT INTO THE ATMOSPHERE 8 Close valve on HCFC 22 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
11. 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 NOTE Use care to make sure that no moisture enters pressure tap port while wet rag is being used NOTE 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 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 liqui
12. ecautionary 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 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 5 FT ABOVE UNIT UNRESTRICTED 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 annoying to the customer since conden sate and fog will occur dur
13. ing the defrost cycle 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 LOCATION AND PREPARATION OF THE UNIT When removing unit from the pallet notice the tabs on the basepan Remove tabs by cutting with a sharp tool as shown on page 2 Figure 2 and slide unit off of pallet 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 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 requiring service access to meet National Electrical Code Also the unit location must be far enough away from any struc Installers Guide BASEPAN TAB REMOVAL ture 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 tran
14. nameplate 3 Install a separate disconnect switch at the outdoor unit 4 Ground the outdoor unit per local code requirements 5 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 Il Control Wiring 24 VOLTS MAX WIRE LENGTH 150 FT 225 FT 300 FT WIRE SIZE 18 AWG 16 AWG 14 AWG 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 instruc tion included with the thermostat Wire per appropriate hook up diagram included in these instructions G 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 be tween the ambient and the colder coil temperature is the difference or delta T measurement This delta T measure ment 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 IDENTIFI
15. smission 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 ACCUTRON FLOW CONTROL VALVE If the indoor unit System Refrigerant Flow control is an Accutron orifice and check valve assembly an orifice size change may be necessary The outdoor model determines the required orifice size Check the listed orifice size on nameplate of the selected outdoor model If the indoor unit is factory shipped with a different orifice size the orifice must be changed to obtain system rated performance IMPORTANT The outdoor unit is shipped with the proper size orifice and a stick on orifice size label in an envelope attached to the outdoor unit Outdoor unit nameplate will have correct orifice size specified as BAYFCCV A for rated performance BRAZE TYPE INDOOR END SEALING CAP EN N N ADAPTER a FLOW CONTROL CHECK VALVE F C C V ORIFICE AS SHIPPED ACCUTRON COMPONENTS FIELD SUPPLIED LIQUID LINE 2002 American Standard Inc
16. 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 and Gas Line Service Valves Turn valve stem counterclockwise only until the stem contacts the rolled edge See Figures 4 and 6 No torque is required BRASS GAS LINE BALL 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 5 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 18 BC51D2 3 Installers Guide GAS LINE SERVICE VALVE ROLLED EDGE TO CAPTIVATE STEM CAP gt a P UNIT SIDE OF j HEX HEADED SERVICE VALVE ey 7 VALVE SYSTEM SERVICE y PORT S GAS LINE CONNECTION 6 Precautions should be taken to avoid heat
17. ve all Refrigerant Lines been secured and isolated properly ccccceeeeceeesseceesseeceeeeeeseeeeeeneeens 4 Have passages through masonry been sealed f mortar is used prevent mortar from coming into direct contact with copper tubing sse eee ee 5 Verify tightness of all electrical connects see 6 Observe outdoor fan during on cycle for clearance and smooth operation eee Indoor coil drain line drains freely Pour water into drain pan REFRIGERANT CIRCUIT Head Pressure Too High 8 Supply registers and return grilles open and unobstructed r a a a a n AA i 9 Return air filter installed Thermostat thermometer is accurate Check against a reliable thermometer Adjust per instructions with thermostat s 11 Is correct speed tap being used Indoor blower Motor sees eee eee 12 Operate complete system in each mode to Insure safe operation ee DEG Head Pressure Too Low Suction Pressure Too High Suction Pressure Too Low Liquid Refrig Floodback TXV Liquid Refrig Floodback Cap Tube o jxzjo zlo jzjojzjojz oj LD Coil Frosting Compressor Runs Inadequate or No Cooling Htg ELECTRICAL Compressor amp O D Fan Won t Start Compressor Will Not Start But 0 D Fan Runs O D Fan Won t Start Jae l Se OOO alel GG aje a a o Compressor Hums But Won t Start ofofo o v o 0 Compressor Cycles on IOL
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2TWR2 1N 1B