Carrier 50BA User Manual download pdf (Page 7)

FIELD-SUPPLIED MOTORS - Factory-installed

motor mounting bracket for 48 frame motors will

not fit 56 frame motors. When replacing 48 frame

motor with 56 frame motor, use mounting bracket

for 56 frame motor.

Indoor Air Fan Adjustment — See Caution

mentioned earlier. Fan motor pulley is factory set

for fan speed shown in Table 1.

TO CHANGE FAN SPEED

1. Shut off unit power supply.

2. Loosen fan belt by loosening fan motor from

mounting bracket. Do not loosen fan motor

mounting bracket from unit. See Fig. 2.

3. Loosen movable pulley flange setscrew (Fig. 5).

4. Screw movable flange toward fixed flange to in

crease fan speed and away from fixed flange to

decrease speed using values shown in Table 1. In

creasing fan speed increases load on motor. Do

not exceed maximum allowable fan speed ( Table

1) or motor full load amps indicated on motor

nameplate and Table 2.

5. Set movable flange setscrew at nearest flat of

pulley hub and tighten setscrew.

6. Check Pulley Alignment and Belt Tension Ad

justment as described later.

7. Check fan operation. Repeat above procedure

as required.

MOVASuE flanges

PULLEYS

SETSCREWS

STRAIGHT EDGE MUST,

8£ PARALLEL

W!TH saj

s£Tsa?Ews-

FIXED FLANGES

SINGLE-GROOVE TWO-GROOVE

« MOTOR a FAN SHAFTS

R MUST BE parallel

Fig. 5 — Indoor Air Fan Pulley Adjustment

PULLEY ALIGNMENT - Loosen fan motor

pulley setscrews and slide fan pulley along fan

shaft. Make angular alignment by loosening motor

from mounting bracket. See Fig. 2 and 5.

BELT TENSION ADJUSTMENT - Loosen fan

motor from mounting bracket. Do not loosen

motor mounting bracket from unit. Move fan

motor up or down until proper belt tension is

achieved (approximately 3/4-in. deflection with

8-lb tension at midpoint of belt span).

Fan Motor Lubrication — See Caution mentioned

earlier. Factory-installed fan motor is factory lubri

cated and requires no lubrication for first 5 years of

operation. Clean and reoil bearings with SAE 10 W

oil annually thereafter. If heating coil is installed,

oil the bearings every 6 months. Field-installed fan

motors should be lubricated according to instruc

tions furnished with motor.

Fan Shaft Lubrication — See Caution mentioned

earlier. Bearings are factory-lubricated, rubber-

mounted ball bearings and require no lubrication.

Return Air Filters — Inspect filters twice monthly

and replace as often as required depending on

operating conditions. Size and type filters are

shown in Table 1. If cleanable filters are used, flush

them with hot water or steam or soak in a mild

solution of soap or detergent and water. Rinse and

allow filters to dry before reinstalling. Refer to

filter manufacturer’s instructions as applicable. Do

not operate unit without return air filters in place.

Refer to Service, Access Panel Removal and Return

Air Grille Removal described earlier as required.

Condensate Drains — Clean drain line and unit

drain pan at the start of each cooling season. Check

flow by pouring water into drain. Be sure trap is

filled to maintain an air seal.

Evaporator Coil — See Caution mentioned earlier.

Remove dirt and debris from evaporator coil as

required. Clean with a stiff brush, vacuum cleaner

or compressed air. Use a fin comb with teeth of

correct spacing (15 fins/in.) when straightening

mashed or bent coil fins.

Water-Cooled Condenser may require cleaning of

scale (water deposits). Condensers are best cleaned

with an inhibited hydrochloric acid solution such

as Oakite 32. Acid will stain hands and clothing

and attack concrete. Without inhibitor, it will

attack steel. Cover surroundings to guard against

splashing. Vapors from vent pipe are not harmful

but take care to prevent liquid from being carried

over by the gases. Warm solution acts more readily

but cold solution applied longer is just as effective.

GRAVITY FLOW METHOD (Fig. 6) - Do not add

solution faster than vent can exhaust generated

gases. When condenser is full, allow solution to

remain overnight, then drain condenser and flush

with clean water. Follow acid manufacturer’s

instructions.

FORCED CIRCULATION METHOD (Fig. 7) -

Fully open vent pipe when filling condenser. Vent

may be closed when condenser is full and pump is

operating. Regulate flow to condenser with supply

line valve. If pump is nonoverloading type, valve

may be fully closed when pump is running.

For average scale deposit, allow solution to

remain in condenser overnight. For heavy deposits,

allow 24 hours. Drain condenser and flush with

clean water. Follow acid manufacturer’s

instructions.

Air-Cooled Condensers — Periodically inspect and

clean depending on operating conditions. Refer to

Start-Up and Service Instructions pertaining to

air-cooled condenser used.

Crankcase Heater (50BB only) — Heater in unit

prevents refrigerant from condensing in compressor

oil while compressor is off. Heater is energized

whenever unit main power is on, but is de

energized when compressor starts. Do not shut off

unit main power supply for an extended period

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Carrier 50BA User Manual Page 7

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