Carrier 48ZT Specifications download pdf (Page 103)

103

Service Access —

All unit components can be reached

through clearly labeled hinged access doors. These doors are

not equipped with tiebacks, so if heavy duty servicing is need-

ed, either remove them or prop them open to prevent accidental

closure.

Each door is held closed with 3 latches. The latches are se-

cured to the unit with a single

-in. –20 x

-in. long bolt. See

Fig. 111.

To open, loosen the latch bolt using a

-in. wrench. Pivot

the latch so it is not in contact with the door. Open the door. To

shut, reverse the above procedure.

NOTE: Disassembly of the top cover may be required under

special service circumstances. It is very important that the ori-

entation and position of the top cover be marked on the unit

prior to disassembly. This will allow proper replacement of the

top cover onto the unit and prevent rainwater from leaking into

the unit.

COMPRESSORS

Sizes 030-050

— Access to the compressors is through the

doors on the condenser end of the unit. This door also provides

access to the discharge and suction service valves, the crank-

case heaters, and the high- and low-pressure switches. Com-

pressor no. 1 is always the compressor on the left when facing

main control box.

Sizes 055-105

— The oil pump end (compressor access) of

each compressor is readily accessible from sides of unit as shown

in Fig. 112. Access the motor end of the compressor through the

condenser end of the unit or by removing compressor.

LIQUID SERVICE VALVES, FILTER DRIERS, AND

SIGHT GLASSES

Sizes 030-050

— Access to these components is through the

access panel on the right side of the unit. See Fig. 112. There is

also a Schrader port in each suction line that is accessible

through this same panel. When charging unit, route service line

through the round holes and replace panel to minimize air

bypass.

Sizes 055-105

— Access to these components is from the side

of the unit as shown in Fig. 112.

SUPPLY-FAN MOTORS, PULLEYS, AND BELTS — Ac-

cess to these components is through the 2 doors labeled FAN

SECTION on each side of the unit.

POWER EXHAUST MOTORS, PULLEYS, AND BELTS —

Access to these components is through the door below the side

economizer hoods on both sides of the unit. See Fig. 113 and

114.

RETURN AIR FILTERS — Access to these filters is through

the door marked FILTER SECTION on the right side of the

unit.

UNIT CONTROL BOX — Access to this component is

through the doors marked ELECTRICAL SECTION on the

condenser end of the unit (when facing the condenser coil).

GAS HEAT SECTION — Access to the gas heat section is

through the door labeled HEAT SECTION on the right side of

the unit (when facing return air end). See Fig. 115 and 116.

All gas system components are in the gas section.

MAIN BURNERS — At the beginning of each heating sea-

son, inspect for deterioration due to corrosion or other causes.

Observe the main burner flames and adjust if necessary. See

Gas System Adjustment section on page 111.

FLUE GAS PASSAGEWAYS — The flue collector box

and heat exchanger cells may be inspected by removing

heat exchanger access panel (Fig. 15-23), flue box cover,

and main burner assembly (Fig. 117). Refer to Main Burn-

ers section on page 111 for burner removal sequence. If

cleaning is required, remove heat exchanger baffles and

clean tubes with a wire brush.

Use caution with ceramic heat exchanger baffles. When in-

stalling retaining clip, be sure the center leg of the clip extends

inward toward baffle. See Fig. 118.

COMBUSTION-AIR BLOWERS — Clean periodically to

assure proper airflow and heating efficiency. Inspect blower

wheel every fall and periodically during heating season. For

the first heating season, inspect blower wheel bi-monthly to

determine proper cleaning frequency.

To inspect blower wheel, remove heat exchanger access

panel. Shine a flashlight into opening to inspect wheel. If clean-

ing is required, remove motor and wheel assembly by remov-

ing screws holding motor mounting plate to top of combustion

fan housing (Fig. 119). The motor and wheel assembly will

slide up and out of the fan housing. Remove the blower wheel

from the motor shaft and clean with a detergent or solvent. Re-

place motor and wheel assembly.

ECONOMIZER DAMPER MOTOR — On units so equipped,

the economizer motor is located in the mixing box section. Ac-

cess to it is through the door labeled FILTER SECTION on the

right-hand side of the unit.

CONDENSER FANS AND FAN MOTORS — Remove the

wire fan guard on top of the unit to gain access to the condenser

fans and motors.

INLET GUIDE VANE MOTOR — The inlet guide vane mo-

tor is located on the evaporator-fan sled on the side opposite the

fan motor. See Fig. 120A and 120B. Access is through the door

labeled FAN SECTION on the left side of the unit.

25% OUTDOOR-AIR DAMPER — Access to adjust the

damper is through the hoods. Remove filters to gain access into

unit to adjust linkage arms.

IMPORTANT: After servicing is completed, make sure

door is closed and relatched properly, and that the

latches are tight. Failure to do this can result in water

leakage into the indoor-air section of the unit.

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Fig. 110 — Accessory Navigator™ Display

1 2 ... 98 99 100 101 102 103 104 105 106 107 108 ... 135 136

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Carrier 48ZT Specifications Page 103

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