Carrier 50LJQ008, 012 Lubrication, Outdoor-FanAdjustment Fig, Ð Outdoor-FanAdjustment

CONDENSATE DRAIN Ð Check and clean each year at start of cooling season. In winter, keep drain dry or protect against freeze-up.

FILTERS Ð Clean or replace at start of each heating and cooling season, or more often if operating conditions require it. Replacement ®lters must be same dimensions as original ®lters.

OUTDOOR-AIR INLET SCREENS Ð Clean screens with steam or hot water and a mild detergent. Do not use dis- posable ®lters in place of screens.

Lubrication

COMPRESSORS Ð Each compressor is charged with cor- rect amount of oil at the factory.

FAN-MOTOR BEARINGS Ð Fan motor bearings are of the permanently-lubricated type. No further lubrication is required. No lubrication of outdoor- or indoor-fan motors is required.

Outdoor-Fan Adjustment (Fig. 24)

Fig.24 Ð Outdoor-Fan Adjustment

1.Shut off unit power supply.

2.Remove outdoor-fan assembly (grille, motor, motor cover and fan) and loosen fan hub setscrews.

3.Adjust fan height as shown in Fig. 24.

4.Tighten setscrews and replace outdoor-fan assembly.

Refrigerant Charge Ð Amount of refrigerant charge is listed on the unit nameplate (also refer to Tables 1A and 1B). Refer to Carrier Standard Service Techniques Manual, Chapter 1, Refrigerants section.

Unit panels must be in place when unit is operating dur- ing charging procedure.

LOW CHARGE HEATING OR NO CHARGE Ð Use stand- ard evacuating techniques. After evacuating system, weigh in the speci®ed amount of refrigerant (refer to Tables 1A and 1B).

LOW CHARGE COOLING Ð Use Cooling Charging Chart, Fig. 25 and 26. Vary refrigerant until the conditions of the chart are met. Note the charging chart is different from type normally used. Chart is based on charging the units to the correct superheat for the various operating conditions. Ac- curate pressure gage and temperature sensing device are re- quired. Connect the pressure gage to the service port on the suction line. Mount the temperature sensing device on the suction line and insulate is so that outdoor ambient tempera- ture does not affect the reading. Indoor-air L/s (cfm) must be within the normal operating range of the unit.

TO USE COOLING CHARGING CHART Ð Take the out- door ambient temperature and read the suction pressure gage. Refer to chart to determine what suction temperature should be. If suction temperature is high, add refrigerant. If suction temperature is low, carefully blow some of the charge. Re- check the suction pressure as charge is adjusted.

Example: (Fig. 26) (Circuit 1)

Outdoor Temperature . . . . . . . . . . . . . . . . . . . . 29 C (85 F) Suction Pressure . . . . . . . . . . . . . . . . . . . 483 kPa (70 psig) Suction Temperature should be . . . . . . . . . . . . . 7 C (46 F) (Suction Temperature may vary ± 3° C (5° F)

If Chargemaster charging device is used, temperature and pressure readings must be accomplished using the charging chart.

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