Carrier 38AUM Series Installation, Operation & Maintenance Manual Download Page 31 | Manualshive

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Carrier 38AUM Series Installation, Operation & Maintenance Manual Download Page 31

TYPICAL WIRING SCHEMATIC – 38AUMZ07/08

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Summary of Contents for 38AUM Series

Page 1: ...handler s offer a wide variety of options for your HVAC application needs Whether it s first cost with the 38AUM single compressor models or superior part load performance from the two compressor mod...

Page 2: ...t serious hazards which will result in severe personal injury of death WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which may r...

Page 3: ...hes and other ignition sources away from refrigerants and oils Before performing service or maintenance operations on unit always turn off main power switch to unit and install lockout tag Unit may ha...

Page 4: ...6 Refrigeration System No of Ckt No of Comp Type Initial Charge per Circuit kg 3 50 3 70 3 20 3 20 4 10 4 40 5 70 5 25 Operating Charge per Circuit kg 5 80 6 20 5 29 5 29 6 99 7 39 9 50 8 75 Metering...

Page 5: ...or concrete walls and other grounded surfaces Control box side 42 inches per NEC 2 With exception of the clearance for the outdoor coil as stated in note 1B are movable fence or barricade requires no...

Page 6: ...nded surfaces Control box side 36 inches per NEC F Between unit and block or concrete walls and other grounded surfaces Control box side 42 inches per NEC 2 With exception of the clearance for the out...

Page 7: ...op A 1 1 8 inch OD suction line is rated at 53 higher tons with Puron than with R 22 at 2 pressure drop Refrigeration lines selected for R 22 use are typically oversized for Puron applications Careful...

Page 8: ...3 Check for possible overhead obstructions which may interfere with unit lifting or rigging Step 1 Plan for Unit Location Select a location for the unit and its support system pad rails or other that...

Page 9: ...nd foliage from obstructing airflow Step 4 Rig and Mount the Unit Rigging These units are designed for overhead rigging Refer to the rigging label for preferred rigging method Spreader bars are not re...

Page 10: ...A liquid lift condition exists when the outdoor unit is located below the indoor evaporator unit and liquid flows vertically up in a portion of the liquid line The vertical column of liquid reduces th...

Page 11: ...and will be the first circuit on and last circuit off Circuit 2 is controlled by the thermostat s Y2 or TC2 contact and this circuit is always the lag circuit See Fig 38AUMD Service Valve Locations fo...

Page 12: ...n of liquid line moisture indicating sightglass in each circuit is recommended Locate the sightglass es between the outlet of the filter drier and the TXV inlet In some applications depending on space...

Page 13: ...ging control via direct thermostat control of a liquid solenoid valve on the evaporator s second stage circuit is not possible with 38AU models If this installation is a retrofit for a unit that inclu...

Page 14: ...that refrigerant always be removed from the cylinder as a liquid Admit liquid refrigerant into the system in the discharge line If adding refrigerant into the suction line use a commercial metering ex...

Page 15: ...ctor and terminal block and equipment ground Provide a ground fault and short circuit over current protection device fuse or breaker per NEC Article 440 or local codes Refer to unit informative data p...

Page 16: ...vary according to the specific construction details of the indoor section air handler or packaged fan coil Fig Typical Remote Thermostat Connection depict typical connections to a Carrier 40RUM fan co...

Page 17: ...arger than no 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat PremierLink accessory installation Refer to Form 33CS 58SI for details...

Page 18: ...ture so there is no demand for cooling 2 Close the field disconnect Preliminary Charge Before starting the unit charge liquid refrigerant into the high side of the system through the liquid service va...

Page 19: ...Connect service gages to the suction and liquid pressure fittings 2 Energize the compressor 3 The suction pressure should drop and the liquid pressure should rise as is normal on any start up Compress...

Page 20: ...t the pressure gage to the service port on the liquid line service valve Mount the temperature sensing device on the liquid line close to the liquid line service valve and insulate it so that outdoor...

Page 21: ...ay period has not expired CADM1 relay will remain open de energizing Solenoid Valve Relay 1 SVR1 and preventing compressor start When safety pressure switches are closed and CADM1 time delay expires C...

Page 22: ...ing to occur in one year or more When performing any service which may risk exposure of compressor oil to the roof take appropriate precautions to protect roofing Procedures which risk oil leakage inc...

Page 23: ...nd an integral spring closed check valve core screwed into the base See Fig 35 This check valve is permanently assembled into this core body and cannot be serviced separately replace the entire core b...

Page 24: ...pause and the repeat the process The number of blinks defined in Table LED Status Codes correlates to a particular abnormal condition troubleshooting tips are provided for each Alert code Reset of the...

Page 25: ...c Evaporator coil is frozen d Faulty metering device e Condenser coil is dirty f Liquid line restriction filter drier blocked if present Yellow ALERT Flash Code 3 Short Cycling Compressor is running...

Page 26: ...odule s Y terminal is connected Verify Y terminal is connected to 24VAC at contactor coil Verify 24VAC is present across Y and C when thermostat demand signal is present If not R and C are reverse wir...

Page 27: ...re to clean the coils may result in reduced durability in the environment Avoid the use of Coil brighteners Acid cleaning prior to painting High pressure washers Poor quality water for cleaning Totali...

Page 28: ...ghly wet finned surfaces with clean water Be careful not to bend the fins 5 Mix Totaline environmentally sound coil cleaner in a 21 2 gallon garden sprayer according to the instructions included with...

Page 29: ...19 19 9 20 2 21 1 Liquid Line 1 2 1 2 1 2 1 2 1 2 Max Lift ft 25 50 75 54 45 Suction Line 7 8 7 8 7 8 7 8 7 8 Charge Ibs 20 9 19 3 21 9 20 3 25 7 24 1 24 5 22 9 25 7 24 1 Legend Equivalent Length Equi...

Page 30: ...oor Evaporator Fan Motor LRA Locked Rotor Amps MCA Minimum Circuit Amps MOCP Maximum Overcurrent Protection Example Supply Voltage is 400V 3ph 60Hz Maximum Deviation From Average Voltage Average Volta...

Page 31: ...TYPICAL WIRING SCHEMATIC 38AUMZ07 08 Page 31...

Page 32: ...TYPICAL WIRING SCHEMATIC 38AUMD12 14 Page 32...

Page 33: ...TYPICAL WIRING SCHEMATIC 38AUMD16 Page 33...

Page 34: ...CHARGING CHARTS Page 34...

Page 35: ...CHARGING CHARTS cont CHARGING CHARTS cont CHARGING CHARTS cont CHARGING CHARTS cont CHARGING CHARTS cont CHARGING CHARTS cont CHARGING CHARTS cont Page 35...

Page 36: ...CHARGING CHARTS cont Page 36...

Page 37: ...CHARGING CHARTS cont Page 37...

Page 38: ...line filter driers with rated working pressures less than 600 psig Do not leave R 410A refrigerant suction line filter driers in line longer than 72 hours Do not install a suction line filter drier in...

Page 39: ...e leak repair and recharge Air in system Recover refrigerant evacuate system and recharge Condenser coil dirty or restricted Clean coil or remove restriction Dirty drier filter Replace filter Dirty co...

Page 40: ...heck if the accurater device is installed in fan coil unit Outdoor Unit Check power supply to see if it matches the unit data plate Are fresh batteries intalled properly in the fan coil remote control...

Page 41: ...NOTES Page 41...

Page 42: ...NOTES Page 42...

Page 43: ...NOTES Page 43...

Page 44: ...s to discontinue or change at any time specifications or designs without notice and without incurring any obligations Supersedes Version 38AUM 50Hz IOMV2 Catalog Number 38AUM 50Hz IOMV3 Effective Date...

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