Carrier 50MP62L-10R, MPE62L-10R, 48MPD Ð Door Latch, Ð Access Locations 48MP70M Unit Shown

Fig. 50 Ð Door Latch

UNIT CONTROL BOX Ð Viewed facing compressors, the control box is at the left end of the unit. Incoming power for controls, refrigerant system, and fan system enters through the control box. The control box contains power compo- nents and electronic controls. Outer panels are hinged and latched for easy opening. Remove screws to remove inner panels. Outer panels can be held open for service and in- spection by using a door retainer on each panel. Remove bottom pin from door retainer assembly, swing retainer out horizontally, and engage pin in one of the retainer ears in the hinge assembly.

COMPRESSORS Ð The oil pump end (compressor access) of each compressor is readily accessible from sides of unit as shown in Fig. 51. Access the motor end of the compressor through the condenser end of the unit or by removing compressor.

LIQUID SERVICE VALVES, SOLENOID VALVES, FIL- TER DRIERS, AND SIGHT GLASSES Ð These compo- nents are located in the inside corner of the condenser sec- tion on the right-hand side of the unit. Filter driers are replaceable-core type. See Fig. 51.

EVAPORATOR-FAN MOTORS, PULLEYS, AND BELTS

ÐAccess to these components is through the 2 doors labeled FAN SECTION on each side of the unit.

POWER EXHAUST MOTORS, PULLEYS, AND BELTS

ÐAccess to these components is through the doors at the return air end of the unit.

GAS HEAT SECTION Ð Access to the gas heat section is through the door labeled ``HEAT SECTION'' on the right hand side of the unit. All gas system components are in the gas section. On 48MP62L and 70M units, additional access to the gas components is through the access panels in the unit corner post at the gas section. See Fig. 51.

UNIT CONTROL BOX Ð Access to this component is through the doors marked ELECTRICAL SECTION on the con- denser end of the unit.

ECONOMIZER DAMPER MOTORS Ð The economizer motors are located in the return air section. Access to the motors is through the doors labelled FAN SECTION on the each side of the unit.

RETURN-AIR FILTERS Ð Access to these ®lters is through the door marked FILTER SECTION on the right side of the unit.

CONDENSER FANS AND FAN MOTORS Ð Remove the wire fan guard on top of the unit to gain access to the con- denser fans and motors.

Cleaning Ð Inspect unit at the beginning of each heating and cooling season and during each season as operating con- ditions may require.

Clean condenser coil with a vacuum cleaner, fresh water, compressed air, or a bristle brush (not wire). Coil cleaning should be a part of the planned maintenance program. Clean evaporator coil with a stiff bristle brush (not wire), vacuum cleaner, or compressed air.

Check and clean condensate drain annually at the start of the cooling season.

Replace return-air ®lters at the start of each heating and cooling season or as often as necessary during each season, depending on operating conditions. See Table 1 for ®lter types, quantities, and sizes.

1.Remove economizer outdoor-air ®lters from the hoods by removing the ®lter retainers.

2.Clean ®lters with steam or hot water and mild detergent.

3.Reinstall ®lters in hoods after cleaning. Never replace clean- able ®lters with throwaway ®lters.

Fig. 51 Ð Access Locations (48MP70M Unit Shown)

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