Carrier 48MPD, MPE62L-10R, 50MP62L-10R specifications Contents, General, Safety Considerations

CONTENTS (cont)

Page

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

·COMPRESSORS

·FAN SHAFT BEARINGS

·FAN MOTOR BEARINGS

·DOOR HINGES

Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . 47

Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Moisture/Liquid Indicator . . . . . . . . . . . . . . . . . . . 49

Filter Driers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Liquid Line Service Valve . . . . . . . . . . . . . . . . . . . 50

Compressor Suction and Discharge

Service Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

High-Pressure Switch . . . . . . . . . . . . . . . . . . . . . . 50

Low-Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . 50

Pressure Relief . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

·EVAPORATOR FAN AND POWER EXHAUST MOTOR PLATE

·BELT INSTALLATION AND TENSIONING

·PULLEY ALIGNMENT

Gas Valve Adjustment . . . . . . . . . . . . . . . . . . . . . . . 52

· NATURAL GAS

Page

Main Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

· MAIN BURNER REMOVAL

Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . 52

·COMPRESSOR PROTECTION

·EVAPORATOR-FAN MOTOR PROTECTION

·CONDENSER-FAN MOTOR PROTECTION

·HIGH- AND LOW-PRESSURE SWITCHES

Variable Frequency Drive (VFD) . . . . . . . . . . . . . 53

·SUPPLY FAN VFD

·EXHAUST FAN VFD

·DISPLAYING FAULT SEQUENCE

Control Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Processor Module(s) (PSIO) . . . . . . . . . . . . . . . . 54

High-Voltage Relay Modules

(DSIO1 and DSIO2) . . . . . . . . . . . . . . . . . . . . . . . . 54 Refrigerant Feed Components . . . . . . . . . . . . . . 54 Thermostatic Expansion Valve (TXV) . . . . . . . . 54 Hot Gas Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Condenser Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Compressor Removal . . . . . . . . . . . . . . . . . . . . . . 55 Compressor Replacement . . . . . . . . . . . . . . . . . . 55

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 55-58 START-UP CHECKLIST . . . . . . . . . . . . . . CL-1 to CL-4

GENERAL

This installation instruction contains base unit installa- tion, start-up, and service instructions only. For complete in- formation on PIC (Product Integrated Controls) controls and troubleshooting, refer to separate Controls and Troubleshoot- ing literature also enclosed in this literature packet.

IMPORTANT:

1.Tune all loops immediately after starting units. Re- fer to Control Loop Checkout section on page 40 for more information on tuning loops.

2.The Data Reset function should be performed any time one or more of the unit factory con®guration values are changed.

3.The HSIO (human sensor input/output) keypad and display module is required for initial start-up of unit. All units are shipped in STANDBY mode. The HSIO must be used to change the unit to RUN mode. The HSIO is not required for normal operation, how- ever, at any time the unit needs to be transferred back into STANDYBY mode, such as when servic- ing a unit, it must be done with the HSIO.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical com- ponents. Only trained and quali®ed service personnel should install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func- tions of cleaning coils and ®lters and replacing ®lters. All other operations should be performed by trained service per- sonnel. When working on air-conditioning equipment, ob- serve precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safety codes, including ANSI (American Na- tional Standards Institute) Z223.1. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have ®re extinguisher available for all brazing operations.

Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury.

Do not store or use gasoline or other ¯ammable vapors and liquids in the vicinity of this or any other appliance.

Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional infor- mation, consult a quali®ed installer or service agency.

This unit uses a microprocessor-based electronic con- trol system. Do not use jumpers or other tools to short out components, or to bypass or otherwise depart from recommended procedures. Any short-to-ground of the control board or accompanying wiring may destroy the electronic modules or electrical components.

Disconnect gas piping from 48 Series units when leak testing at pressures greater than 0.5 psig. Pressures greater than 0.5 psig will cause gas valve damage resulting in a hazardous condition. If gas valve is subjected to pres- sure greater than 0.5 psig, it must be replaced. When pressure testing ®eld-supplied gas piping at pressures of

0.5psig or less, the unit connected to such piping must be isolated by manually closing the gas valve.

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