Carrier NP034-074 specifications Liquid Service VALVES, Filter DRIERS, and Sight Glasses

Fig. 33 Ð Door Latch

LIQUID SERVICE VALVES, FILTER DRIERS, AND SIGHT GLASSES

Sizes 034 and 044 Ð Access to these components is through the access panel on the right side of the unit. See Fig. 34. There is also a Schrader port in each suction line that is ac- cessible through this same panel. When charging unit, route service line through the round holes and replace panel to mini- mize air bypass.

Sizes 054-074 Ð Access to these components is from the side of the unit as shown in Fig. 34.

EVAPORATOR-FAN MOTORS, PULLEYS, AND BELTS

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

POWER EXHAUST MOTORS, PULLEYS, AND BELTS

ÐAccess to these components is through the door below the side economizer hoods on either side of the unit. See Fig. 35 and 36.

UNIT CONTROL BOX Ð Access to this component is through the doors marked ELECTRICAL SECTION on the con- denser end of the unit (when facing the condenser coil).

GAS HEAT SECTION (48 Series Units Only) Ð Access to the gas heat section is through the door labeled HEAT SEC- TION on the left side of the unit (when facing condenser end). See Fig. 37 and 38.

All gas system components are in the gas section.

MAIN AND PILOT BURNERS (48 Series Units Only) Ð At the beginning of each heating season, inspect for dete- rioration due to corrosion or other causes. Observe the pilot and main burner ¯ames and adjust if necessary. See Auto- matic Pilot Adjustment or Main Burners Adjustment Section on pages 49 and 50.

FLUE GAS PASSAGEWAYS (48 Series Units Only) Ð The ¯ue collector box and heat exchanger cells may be inspected by removing the combustion air blower(s), ¯ue box cover, and main burner assembly. See Fig. 39 and 40. If cleaning is required, remove heat exchanger baffles through the ¯ue box and clean all parts with a wire brush. When replacing heat exchanger baffles, be sure to replace screw through clamp on baffle retaining rod into the vestibule plate.

Fig. 34 Ð Typical Filter Drier and Liquid Service

Valve Access

Fig. 35 Ð Modulating Power Exhaust Damper

Motor Access, 034 and 044 Units

Fig. 36 Ð Modulating Power Exhaust Motor

Access, 054-074 Units

COMBUSTION AIR BLOWER (48 Series Units Only) Ð Clean periodically to assure proper air¯ow and heating ef- ®ciency. Inspect blower wheel every fall and periodically dur- ing the heating season. For ®rst heating season, inspect blower wheel bimonthly to determine proper cleaning frequency. If cleaning is required, remove blower assembly from unit and then disassemble and clean. See Fig. 41.

43