Carrier 38EH User's Manual
Contents
1. gt HEATING amp COOLING 38EH Air Cooled Condensing Units Installation and Start Up Instructions SAFETY CONSIDERATIONS Installing and servicing air conditioning equipment can be hazardous due to system pressure and electrical components Only trained and qualified service personnel should install or service air conditioning equipment Untrained personnel can perform basic maintenance such as cleaning and replacing filters All other opera tions should be performed by trained service personnel When working on air conditioning equipment observe precautions in literature and on tags and labels attached to unit Follow all safety codes Wear safety glasses and work gloves Use quenching cloth for brazing operations Have fire extinguisher available Read these instructions thoroughly Consult local building codes and NEC National Electrical Code for special installation requirements A WARNING Before installing or servicing system always turn off main power to system There may be more than one disconnect switch Turn off accessory heater power if applicable Electrical shock can cause personal injury Step 1 Install on a Solid Level Mounting Pad It is recommended that unit be attached to pad using tiedown bolts Fasten unit to pad using holes pro vided in unit base See Fig When installing allow sufficient space for airflow clearance wiring refrigerant piping and service Main tain a mi2. IRFLOW AND SERVICE CLEARANCE AROUND UNIT 12 ON VALVE SIDE UNIT SIZES 015 018 024 3 TIEDOWN BOLTS CONCRETE MOUNTING PAD SQ OR CIRCULAR f 20 TYP CENTER LINE BETWEEN VALVES UNIT SIZES 030 060 3 TIEDOWN BOLTS CONCRETE MOUNTING PAD SQ OR CIRCULAR I5 TYP CENTER LINE BETWEEN VALVES Certified dimension drawings available upon request Fig 1 Dimensions Connections and Mounting Pad Refer to Table 1 Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Catalog No 533 813 Book i 4 PC 101 Tab j3al2a PrintedinUSA For replacement items use Carrier Specified Parts Form 38EH 5SI Pg1 1 86 Replaces 38EH 3SI Cy A Table 1 Physical Data Refer to Fig 1 015 o18 024 030 036 042 oas oso OPER WT Ib 236 REFRIGERANT 22 Control AccuRater Installed in 1 D Coil COND FAN Propeller Type Direct Drive 1 Speed Air Discharge Vertical Air Qty cim 1850 3100 1 4000 Motor Rpm 60 Hz 830 850 Motor Hp Yo W VA COND COIL fins in 16 Tube Diam in E coil Rows 1 2 Face Area sq ft 12 37 17 11 DIMENSIONS ft in Diameter A 1 9 2 54 Height B 2 7 CONN in ODF Compatible Fitting Suction and Liquid Suction A Liquid REFRIG LINES in ODF Suction Yq Wet Liquid MODEL 38EH Weight increases slightly with addition of any a
3. bypass method of returning charge to system Removal of liquid line charging hose without following these precautions could result in some loss of charge Refrigerant Charging Refer to Tables 4 and 5 A CAUTION To prevent personal injury wear safety glasses and gloves when handling refrigerant Do not overcharge system This can cause compressor flooding l Operate unit a minimum of 10 minutes before check ing charge 2 Measure suction pressure by attaching a gage to suction valve service port 3 Measure suction line temperature by attaching a service thermometer to unit suction line near suc tion valve Insulate thermometer for accurate readings 4 Measure outdoor coil inlet air dry bulb temperature with a second thermometer 5 Measure indoor coil inlet air wet bulb temperature with a sling psychrometer 6 Refer to Table 4 Find air temperature entering out door coil and wet bulb temperature entering indoor coil At this intersection note the superheat 7 Refer to Table 5 Find superheat temperature and suction pressure note suction line temperature at suction valve changes charge to new suction line temperature indicated on chart 11 This procedure is valid independent of indoor air 10 If air temperature entering outdoor coil or pressure uction line temperature than add refrigerant until charted so are we EO OoO gt a ago a So ZO a Nn o Sos aes 23s E22 2 gE a ae If u
4. ccessories 38EH048 060 require a 1 in suction tine for optimum performance A x 1 in connection adapter accessory Carrier Part No 28AU900061 is available If a in accessory tubing package is used expect a 3 capacity loss Table 2 AccuRater Chart ACCURATER PISTON NO COND UNIT Indoor Coil Size 28 38EH and Indoor Fan Coil Size 40 1 and 3 Ph boy TT ig 018 o2a 030 ose os2 oas Sey 015 46 46e Txv j o8 4 49 txv 0o24 61 61 txv o30 70 70 txv ose 76 76 Txv o42 82 82 Txv 048 ae Sees 80 060 FLARE NUT RETAINER PISTON ACCURATER BODY FLARE CONNECTION Fig 2 AccuRater Bypass Type Components A CAUTION DO NOT BURY MORE THAN3 FT OF REFRIG ERANT TUBING IN GROUND If any section of tubing is buried there must be a 6 in vertical rise to the valve connections on the outdoor unit If more than the recommended length is buried refrigerant may migrate to cooler buried section during extended periods of unit shutdown causing refrigerant slug ging and possibly compressor damage at start up CONNECT REFRIGERANT LINES to fittings on out door unit suction and liquid service valves Fig 1 Unit Compatible Fittings permit mechanical quick connect or sweat connectio
5. nimum of 4 ft clearance from obstructions above and 18in around unit 12in on valve side Main tain a distance of 24in between condensing units Position so water or ice from roof or eaves cannot fall directly on unit Step 2 Replace Indoor AccuRater Piston if Required Check indoor coil piston to see if it matches the required piston listed in Table 2 If it does not match replace indoor coil piston with piston shipped with this outdoor unit located in plastic bag taped to valves See Fig 2 Step 3 Make Piping Connections Outdoor units may be connected to indoor sections using Carrier accessory tubing package or field supplied tubing of refrigerant grade correct size see Table and condition For tubing requirements beyond 50 ft obtain informa tion from Carrier distributor OUTDOOR UNITS CONNECTED TO CARRIER APPROVED INDOOR UNITS Outdoor units con tain correct system refrigerant charge for operation with indoor unit of the same size when connected by 25 ft of field supplied or Carrier accessory tubing Check refrig erant charge for maximum efficiency see Refrigerant Charging DISCHARGE A GRILLE 4 0 OVERHEAD SPACE REQUIRED FOR SERVICE AND AIRFLOW CONTROL BOX a i NTT i inni LOUVERED CASING WIRING WIRING rea VALVE SERVICE PORT HIDDEN SUCTION VALVE SERVICE PORT AIRFLOW l 6 A
6. nit has lower suction line temperature than charted temperature bleed refrigerant until charted temperature is reached 9 quantity NOTE For service data refer to separate service manual for Models 38EH EN ES QH QN QS Table 4 Superheat Charging Table Superheat Entering Suction Service Valve Re S 518 A 8 R D ys 2 a q N TEMP F 50 52 OUTDOOR a Do not attempt to charge system under these conditions or refrigerant slugging may occur Table 5 Required Suction Tube Temperature F Entering Suction Service Valve lolglsslglolglsjslsliLikijelslzjss 3 s pa O e m Sliv lio im a o lion lo lolon me IO LO IN oO oO CO SF SF SP SF LO 10 10 10 10 CO ejeje mINRI NM S oo sig Sue on PRESSURE AT roRT oj ajie olojlojn xjiojojolNj t ojvjSiNjgt 22 ejere riN NINININI A 091 09 Olt SUPERHEAT TEMP F Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 1 i PC 101 Catalog No 533 813 PrintedinUSA Form 38EH 5SI Pg6 886 1 86 Replaces 38EH 3S Tab 3al2a For replacement items use Carrier Specified Parts
7. ns Compatible Fitting on outdoor section has aluminum plugs located beneath compatible nut one plug each on suction and liquid valves Plugs keep contaminants out of Compatible Fitting A CAUTION When removing compatible nut be careful pressure build up does not cause aluminum plug s to blow and cause personal injury After tubing is hooked up discard plug s Models 38EH048 060 When using 1 8 in field supplied refrigerant suction line sweat connect suction line to 1 1 8 in end of required connection adapter Be sure to provide a heat sink at the service valve to prevent damage during sweating operation Connect 3 4 in end of adapter to unit suction line Compatible Fitting Connect liquid refrigerant line to unit When a 7 8 in field supplied suction line is used provide a field supplied 3 4 in to 7 8 in suction line adapter not necessary if 38LS accessory tubing is used Mechanical Connection Mate one set of connections at a time Remove nut on Compatible Fitting 2 Remove plug and be sure O ring is in the groove inside the Compatible Fitting 3 Cut tubing to correct length deburr and size as neces sary Slide nut onto tube 4 Insert tube into Compatible Fitting until it bottoms Tighten nut until it bottoms on shoulder of fitting or valve Keep tube bottomed in Compatible Fitting while tightening nut NOTE If using Carrier accessory tubing package make connections within 2 minutes
8. rea around leak Repair using low temperature 430 F solder Evacuate or purge evaporator coil and tubing system Add refrigerant charge See Refrigerant Charging Step 4 Make Electrical Connections Be sure field wiring complies with local and national fire safety and electrical codes and voltage to system is within limits shown in Table3 Contact local power company for correction of improper line voltage NOTE Operation of unit on improper line voltage constitutes abuse and could affect Carrier warranty See Table 3 Do not install unit in system where voltage may fluctuate above or below permissible limits See Table 3 for recommended fuse sizes When making electric connections provide clearance at unit for refrig erant piping connections INSTALL BRANCH CIRCUIT DISCONNECT PER NEC of adequate size to handle unit starting current Locate disconnect within sight from and readily acces sible from unit per Section 440 14 of NEC National Electrical Code ROUTE LINE POWER LEADS Extend leads from disconnect through power wiring hole provided see Fig 1 and into unit splice area Remove control box cover to gain access to unit wiring CONNECT GROUND LEAD AND POWER WIRING Connect ground lead to ground connection in control box for safety Then connect power wiring See Fig 4 Splice line power leads to yellow and black pigtails Use wire nuts and tape at each connection Connect unit wiring to copper power wi
9. ring only GROUND LEAD GROUNDING LUG 5X Bik I PHASE CONN TO DISCONNECT PER NEC 5 SPLICE CONNECTIONS FIELD WIRING FACTORY WIRING Fig 4 Line Power Connections l PHASE COND UNIT CONNECT CONTROL POWER WIRING Route 24 v control wires through contro wiring hole and connect to pigtails supplied with unit Fig 1 Splice control leads to brown and blue pigtails on all units See Fig 5 Use furnace or fan coil transformer as 24 v 40 va minimum supply for system as shown in Fig 5 or use accessory transformer NOTE Some 38EH units are equipped with a fan time delay This permits indoor fan to continue to operate for gt Table 3 Electrical Data 60 Hz curpoon ypu _openvortss comen ran moa MAXEUSELOR ee Max Min CKT BKR Amps 015 07 15 018 0 7 15 024 07 30 030 208 230 1 253 197 09 40 036 0 9 40 042 0 9 45 048 25 50 060 60 036 5 e T 09 15 3 25 042 5 09 22 3 35 048 5 208 230 3 253 187 920 196 25 270 45 060 5 98 0 209 1 9 28 0 45 036 6 3 o 4 as 16 74 15 042 6 16 103 15 048 6 AE0 8 208 sl 46 0 72 16 106 15 060 6 49 0 104 16 145 20 FLA Full Load Amps Permissible limits of the voltage range at which unit will operate HACR Heating Air Conditioning Refrigeration satisfactorily LRA Locked Rotor Amps Time delay fuse MCA Minimum Circuit Amps NOTE Control circuit is 24v on all units and requires ex
10. ternal RLA Rated Load Amps power source 3 886 THERMOSTAT SUBBASE 99TZ90008125 OR 9TZ9000 Gia AS eg a ae ee 99TZ9 1150 SBE 1 eae ree eee 5 ite fl Neen ined r i TOIFM LINE VOLTAGE POWER a SUPPLY i l EPT STEN ERE Ai ae l TRANS l NAAA l EN Beare E nal ARRANGEMENT A COOLING ONLY THERMOSTAT SUBBASE 99TZ90008125 OR i ee 99TZ90001150 z 38EH i ADD JUMPER ON SUBBASE 1 l TO IFM LINE VOLTAGE POWER SUPPLY A T as Cc Ps o JE ROS De eaea a ek a tee Be ARRANGEMENT B ONE TRANSFORMER COOLING AND ONE STAGE HEATING THERMOSTAT SUBBASE 99TZ90036120 E E E ESEE EG q LEAVE JUMPER ON SUBBASE RH TO RC 38EH r t l l eee VOLTAGE ON POWE D ECON i re TO IFM LINE i l l ARRANGEMENT C ONE TRANSFORMER COOLING AND TWO STAGE HEATING IFR and IFM are located in furnace on heating cooling applica tions If accessory IFR is required for cooling only applications locate IFR in fan coil Cc Contactor 12 va 4 Field Splice HC Heating Control IFM Indoor Fan Motor m Field Wiring IFR Indoor Fan Relay Trans Transformer Factory Wiring NOTE Refer to unit wiring label for wire colors C to GandCtoY connections Fig 5 Control Circuit Connections 90 seconds which provides additional cooling after compressor has c
11. to avoid refrig erant loss 5 If using field supplied tubing evacuate or purge system using field supplied refrigerant A CAUTION If undersized damaged or elliptically shaped tubing is used when making Compatible Fitting leaks may result Sweat Connection Use refrigerant grade tubing 1 Remove locking nut plug rubber O ring and Schrader core and cap from valve service port 2 Cut tubing to correct length deburr and size as necessary 3 Insert tube in Compatible Fitting until it bottoms NOTE Wrap top and bottom of service valves in wet cloth to prevent damage by heat Solder with low temperature 430 F silver alloy solder 4 Replace Schrader core and cap 5 Evacuate or purge system using field supplied refrigerant CUT HERE al l T Fig 3 Repair of Mechanical Connection O RING Compatible Fitting Repair MECHANICAL CONNECTION Frontseat unit service valves Relieve refrigerant pressure from tubing Back off locknut from Compatible Fitting onto tube Cut fitting between threads and O ring See Fig 3 Remove tubing section remaining in threaded portion of fitting Discard locknut Clean flux and insert new tube end into remaining portion of Compatible Fitting Wrap valve in wet rag to prevent damaging factory made joints Heat and apply low temperature 430 F solder SWEAT CONNECTION Frontseat unit service valves Relieve refrigerant pressure from tubing Clean and flux a
12. ycled off Refer to separate installation instructions packaged with fan time delay shipped with unit A WARNING To avoid personal injury be sure indoor blower has stopped before attempting service or maintenance Step 5 Start Up 1 When equipped with a crankcase heater energize heater a minimum of 24 hours before starting unit To energize heater only set thermostat at OFF position and close electrical disconnect to outdoor unit 2 Backseat open liquid and suction line service valves 3 Unit is shipped with valve stem s frontseated and caps installed Replace stem caps after system is opened to refrigerant flow backseated Replace caps finger tight and tighten additional 1 6 turn with wrench See sticker on valve cap CAUTION THREAD CAP ON UNTIL GASKET MAKES CONTACT WRENCH TIGHTEN 4 Set thermostat selector switch at OFF 5 Set room thermostat at desired temperature Be sure set point is below indoor ambient temperature 6 Close electrical disconnects to energize system 7 Set room thermostat at COOL and fan switch at FAN or AUTO as desired Operate unit for 15 minutes Check system refrigerant charge See Refrigerant Charging below Motors and controls are designed to operate satis factorily in the voltage range shown in Table 3 If neces sary to use manifold gages for servicing refer to Carrier Standard Service Techniques Manual Chapter 1 Refrig erants page 1 5 Fig 8 for
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