INSTALLER`S GUIDE Condensing Units Models 2A7B3018-060
Contents
1. r ITI 6 74 an o if EO v O i C DRILL L 599 23 58 4 PLACES 127 28 64 A J BASE 4 O T NOTE For model base size see table on page 7 688 27 09 From Dwg 21D152989 Rev Q 580 22 85 335 13 19 He 48 18 99 599 23 58 BASE 3 CHECKOUT PROCEDURE After installation has been completed it is recommended that the entire system be checked against the following list Refrigerant Line Leak checked Indoor coil drain line drains freely Pour water fags into drain pan Suction Lines and Fittings properly insulated Supply registers and return grilles open and Have all Refrigerant Lines been secured and unobstructed isolated properly sicccscsseessises secctsecsasxdeceaceessasseahsseesise Return air filter installed Have passages through masonry been sealed If mortar is used prevent mortar from coming Thermostat thermometer is accurate Check into direct contact with copper tubing against a reliable thermometer Adjust per iat as instructions with thermostat Verify tightness of all electrical connects Is correct speed tap being used Observe outdoor fan during on cycle for clearance Indoor blower motor and smooth operation Operate complete system in each mode to i insure safe operation sssssssssssssssresssrssseesssresssee Technical Literature Pri2. 3 4 457 18 2A7B3024A 832 32 3 4 724 28 1 2 651 25 5 8 3 4 137 5 3 8 65 2 5 8 210 8 1 4 57 2 1 4 457 18 GAS LINE SERVICE VALVE AAA 2A7B3030A 832 32 3 4 829 32 5 8 756 29 3 4 3 4 137 5 3 8 86 3 3 8 210 8 1 4 79 3 1 8 508 20 2A7B3036A 832 32 3 4 829 32 5 8 756 29 3 4 7 8 137 5 3 8 86 3 3 8 210 8 1 4 79 3 1 8 508 20 2A7B3042A 841 33 1 8 946 37 1 4 870 34 1 4 7 8 152 6 98 3 7 8 219 8 5 8 86 3 3 8 508 20 2A7B3048A 1045 41 1 8 946 37 1 4 870 34 1 4 152 6 98 3 7 8 219 8 5 8 86 3 3 8 508 20 2A7B3060A 1045 41 1 8 946 37 1 4 870 34 1 4 152 6 98 3 7 8 219 8 5 8 86 3 3 8 508 20 From Dwg 21D153074 Rev 9 Pub No 11 AC17D1 2 PAGE 7 INSTALLER S GUIDE MOUNTING HOLE LOCATION NOTE ALL DIMENSIONS ARE IN MM INCHES 265 10 43 124 4 90 310 12 20 N DRILL 4 4 PLACES 158 6 24 x aa w e gt O DRILL 4 PLACES Atl x C Gi J Oo N YAY y II IN 317 12 49 y A X Q Ii 3 J ee L 205 8 07 717 28 24 15 67 w SIT 20 34 317 12 48 213 8 39
3. 5 psig to Subcool Charging Table Pressure e u Z W T wW g T L W use Design Subcool value from Table wW ou Q subtract 5 psig from S C Table Pressure 10 20 25 TOTAL REFRIGERANT LINE LENGTH FEET 40 60 80 Pub No 11 AC17D1 2 INSTALLER S GUIDE 2A7B3 OUTLINE DRAWING NOTE ALL DIMENSIONS ARE IN MM INCHES ELECTRICAL AND REFRIGERANT COMPONENT CLEARANCES PER PREVAILING CODES 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 LIQUID LINE SERVICE VALVE E 1 0 FEMALE BRAZED CONNECTION WITH 1 4 SAE FLARE PRESSURE TAP FITTING K ELECTRICAL SERVICE ____ PANEL 25 oy 22 2 1 8 DIA HOLE _ I LOW VOLTAGE 28 6 1 1 8 DIA K 0 Wi 22 2 7 8 DIA HOLE IN CONTROL BOX BOTTOM FOR ELECTRICAL POWER SUPPLY LIQUID LINE SERVICE VALVE E 1 0 FEMALE BRAZE H i D D FEMALE BRAZED CONNECTION WITH 1 4 SAE F e CONNECTION WITH 1 4 SAE FLARE FLARE PRESSURE TAP FITTING 2 PRESSURE TAP FITTING FIG 2 J Ld FIG 1 G 4 GAS LINE 1 4 TURN BALL SERVICE VALVE D 1 D FEMALE BRAZED CONNECTION WITH 1 4 SAE FLARE PRESSURE TAP FITTING MODELS A B C D E F G H J K 2A7B3018A 651 25 5 8 724 28 1 2 651 25 5 8 5 8 1 4 127 5 57 2 1 4 181 7 1 8 44 1
4. VALVE ROLLED EDGE TO CAPTIVATE STEM CAP gt O HEX HEADED UNIT SIDE OF VALVE SYSTEM SERVICE VALVE GAS LINE CONNECTION 2 Attach appropriate hoses from manifold gauge to gas and liquid line pressure taps NOTE Unnecessary switching of hoses can be avoided and complete evacuation ofall lines leading to sealed system can be accomplished with manifold center hose and connecting branch hose toa cylinder of HCFC 22 and vacuum pump 3 Attach center hose of manifold gauges to vacuum pump 4 Evacuate until the micron gauge reads no higher than 350 mi crons 5 Close offvalve 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 A3 4 Open End wrench is required to take off the va
5. line valve is not a back seating valve see WARNING below A WA R N l N G Extreme caution should be ex ercised when opening the Liquid and Gas Line Service Valves Turn valve stem counterclockwise only until the stem contacts the rolled edge See Figures 3 and 5 No torque is required BRASS GAS LINE BALL SERVICE VALVE The Brass Gas Line Ball 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 Pub No 11 AC17D1 2 4 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 COOLING 4 lt tette w T gt HEATING 6 Precautions should be taken to avoid heat damage to the pressure tap valve core during brazing Itis recommended that the pressure t
6. wiring is complete SET THE THERMOSTAT 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 H 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 Pub No 11 AC17D1 2 I ELECTRIC HEATERS Electric heaters if used are to be installed in the air handling device according to the instructions accompanying the air handler and the heaters J 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 INSTALLER S GUIDE K SEACOAST SALT SHIELD BAYSEAC001 Seacoast Kit is available for application on units installed within one mile of salt water including seacoasts and inland waterways TYPICAL FIELD WIRING DIAGRAMS TASTAT AIR HANDLER HEAT PUMP
7. Americam Standard HEATING amp AIR CONDITIONING 11 AC17D1 2 INSTALLER S GUIDE ALL phases of this installation must comply with NATIONAL STATE AND LOCAL CODES Condensing Units Models 2A7B3018 060 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 variationsin systems nor provide for every possible contingency to be met in connec tion with installation All phases of this installation must comply with NATIONAL STATE AND LOCAL CODES Should further information be desired or should particular prob lems 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 WA R N l N G Thisinformationisintended for use by individuals possessing adequate backgrounds of electrical and mechanical experience Any attempt to repair a central air conditioning product may result in personal injury and or property damage The manufac turer or seller cannot be responsible for the interpreta tion of this information nor can it assume any liability in connection with its use The following instructions cover 2A7B3 Condensing Units NOTE AMERICAN STANDARD HEATING amp AIR CONDI TIONING HAS ALWAYS RECOMMENDED INSTALLING MANUFACTURER APPROVED MATCHED INDOOR AND OUTDOOR SYSTEMS THE BENEFITS OF INSTA
8. ED FROM B152904P03 Notes Be sure power supply agrees with equipment nameplate Power wiring and grounding of equipment must comply with local codes VARIABLE SPEED TSTAT AIR HANDLER HEAT PUMP Hi BE z Ww ies PRINTED FROM B 52934P03 LEGEND Low voltage wiring to be No 18 AWG minimum conductor ODT B must be set lower than ODT A If outdoor thermostats ODT are not used connect W1 to W2 and W3 N A to programmable thermostat Pub No 11 AC17D1 2 FACTORY WIRING FIELD WIRING PAGE 5 INSTALLER S GUIDE SUBCOOLING CHARGING IN COOLING ABOVE 55 F OD AMBIENT American Standard Heating amp Air Conditioning has always recommended installing approved matched indoor and outdoor systems All 13 SEER are ARI rated with only TXV indoor systems The benefits of installing approved indoor and outdoor split systems are maximum efficiency optimum performance and the best overall system reliability The following charging methods are therefore prescribed for systems with indoor TXV s 1 Subcooling in the cooling mode is the only recommended method of charging above 55 F outdoor ambient temperatures 2 For best results the indoor temperature should be kept between 70 F to 80 F Add system heat if needed 3 At startup or whenever charge is removed or added the system must be operated for a minimum 20 minutes to stabilize before accurate measurements can
9. LLING APPROVEDINDOOR AND OUTDOOR SPLIT SYSTEMS ARE MAXIMUM EFFECIENCY OPTIMUM PERFORMANCE AND THE BEST OVERALL SYSTEM RELIABILITY 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 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 in Figure 2 see page 2 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 reference ALG APG0 EN latest revi sion number 2009 American Standard Heating amp Air Conditioning 1 5 FT ABOVE UNIT UNRESTRICTED SSS eE EM gt SS lt lt lt N N X W nt WS Nin AAA IIAJ BZ BS a Le Se pe pN oa en A 3 Se Sa an Z ae NN a SO a3 mon P A en ee a oe SaN SS SS a a RR eS a ae oa ie rsa ae SF an TN n TS Sa ae oS as e TB TL PE Sa eS SS a E aa as een aaa ee a TA oS A Ss oC oe EB tae MMM 7 ANALL A AAA LL 3 The support pad must NOT be in direct contact with any structure Unit must be positioned a minimum of 12 f
10. ap 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 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 connec tions 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 Pub No 11 AC17D1 2 INSTALLER S GUIDE GAS LINE SERVICE
11. be made 4 Measure Liquid Line Temperature and Refrigerant Pressure at service valve 5 Determine total refrigerant line length and height lift if indoor section is above the condenser 6 Determine the Design Subcool Charging Temperature from the unit nameplate 7 Locate this value inthe appropriate column of the Subcooling Charging Table Locate your liquid line temperature in the left column of the table and the intersecting liquid line pressure under your nameplate subcool value column Add refrigerant to raise the pressure to match the table or remove refrigerant to lower the pressure Again wait for 20 minutes for the system conditions to stabilize before adjusting charge again R 22 SUBCOOLING CHARGING TABLE fou DESIGN SUBCOOLING VALUES F CF LIQUID LINE PRESSURE psi 45 89 93 96 100 50 98 102 105 109 55 107 111 115 119 60 117 121 126 130 65 128 132 137 141 70 139 144 148 153 75 151 156 161 166 80 163 168 174 179 85 176 182 187 193 90 190 19 202 208 95 205 2 217 223 100 220 226 233 239 105 236 243 249 256 110 253 260 267 274 115 21 278 285 293 120 289 297 305 313 125 309 317 325 333 g When system is correctly charged you can refer to System Pressure Curves in Service Facts to verify typical performance SUBCOOL CHARGING TABLE CORRECTIONS FOR LINE LENGTH AND RISE PAGE 6 Add
12. hock 1 Power wiring and grounding of equipment must comply with local codes 2 Power supply must agree with equipment 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 trans mission 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 Wiring 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 instruction included with the thermostat Wire per appropriate hookup diagram included in these instructions F DEFROST CONTROL The demand defrost control measures heat pump outdoor ambi ent temperature with a sensor located outside the outdoor coil 24 VOLTS WIRE SIZE MAX WIRE LENGTH 18 AWG 150 FT 16 AWG 225 FT 14 AWG 300 FT 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 measur ing the change in delta T we can determine the need for defr
13. lve 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 back out counterclockwise until valve stem just touches rolled edge ap proximately five 5 turns observing WARNING statement on page 2 See Figure 3 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 counterclockwise using 1 4 Open End or Adjustable wrench See Figure 4 For brass gas line service valve opening follow 9 and 10 above See Figure 5 PAGE 3 INSTALLER S GUIDE 12 The gas valve is now open for refrigerant flow Replace valve stem cap to prevent leaks Again these caps MUST BE RE PLACED 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 refriger ant charge upon completion of installation See unit Service Facts E ELECTRICAL CONNECTIONS A WAR N l N G When installing or servicing this equipment ALWAYS exercise basic safety precau tions to avoid the possibility of electric s
14. nted in U S A American Standard Heating amp Air Conditioning Troup Highway Tyler TX 75707 PAGE 8 Pub No 11 AC17D1 2 02 09
15. ost 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 PAGE 4 PIN IDENTIFICATION zZ e Q Oo e n Ww N Pa FRC_DFT a a TST 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 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 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 WARN l NG Do NOT connect 24 VAC to T1 ODS A terminal ODS A thermistor WILL BE BLOWN G COMPRESSOR START UP After all electrical
16. r handler in accordance with instruction included with that unit NOTE Refer to Refrigerant Piping Software Pub No 32 3312 0 and Refrigerant Piping Manual Pub No 32 3009 0 the position of the denotes latest revision number damaged by these falling icicles C INSTALLING REFRIGERANT LINES A CAU TI ON 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 CAU T l ON Inscroll 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 3 LIQUID LINE SERVICE VALVE ROLLED EDGE TO CAPTIVATE STEM CAP __ gt UNIT SIDE OF SERVICE VALVE lt _ HEX HEADED VALVE SYSTEM SERVICE PORT LIQUID LINE CONNECTION PAGE 2 Final refrigerant charge adjustment is necessary Use the Charging Information in the outdoor unit Service Fact
17. rom any wall or surrounding shrubbery to insure adequate airflow Clear ance must be provided in front of control box access panels amp 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 roofrun off water from pouring directly on the unit When choosing the location of the unit s sound transmission through air and refrigerant lineset should be taken into consideration It is recommended to locate unit s away from areas bedrooms etc where such sound could be objectionable 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 recom mended to prevent transmission to the building structure 6 The maximum length of refrigerant lines from outdoor to indoor unit should NOT exceed sixty 60 feet Since the manufacturer has a policy of continuous product and product data improvement it reserves the right to change design and specifications without notice INSTALLER S GUIDE Q BASEPAN TAB REMOVAL 7 Ifoutdoor unit is mounted above the air handler maximum lift should not exceed sixty 60 feet suction line If air handler is mounted above condensing unit maximum lift should not exceed sixty 60 feet liquid line 8 Locate and install indoor coil or ai
18. s 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 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 refrigerant 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 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 to the field brazing side of the valve when the valve is in the seated position The liquid
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