Condenser-Fan Adjustment (Fig. 40)
1.Shut off unit power supply.
2.Remove
3.Adjust fan height as shown in Fig. 40.
4.Tighten setscrews and replace
48TJ UNIT VOLTAGE | FAN HEIGHT ``A'' (in.) |
208/230 V | 2.75 |
460 V and 575 V | 3.50 |
Fig. 40 Ð Condenser-Fan Adjustment
Manual
Economizer Adjustment Ð Refer to Optional Econo- mizer sections on pages 12 and 15.
Condenser Coil Grille Ð Condenser coil grille is shipped
Refrigerant Charge Ð Amount of refrigerant charge is listed on unit nameplate (also refer to Table 1). Refer to Carrier GTAC
Unit panels must be in place when unit is operating dur- ing charging procedure.
NO CHARGE Ð Use standard evacuating techniques. After evacuating system, weigh in the speci®ed amount of refrig- erant (refer to Table 1).
LOW CHARGE COOLING Ð Using Cooling Charging Charts, Fig.
to the service port on the suction line. Mount the tempera- ture sensing device on the suction line and insulate it so that outdoor ambient temperature does not affect the reading. Indoor- air 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 appropriate chart to determine what suction tem- perature should be. If suction temperature is high, add re- frigerant. If suction temperature is low, carefully recover some of the charge. Recheck the suction pressure as charge is ad- justed. Example (Fig. 44, Circuit 2):
Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 85 F Suction Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 psig Suction Temperature should be . . . . . . . . . . . . . . . . . . 56 F (Suction temperature may vary ± 5 F.)
If Chargemaster charging device is used, temperature and pressure readings must be accomplished using the charging charts.
Fig. 41 Ð Cooling Charging Chart; 48TJ008
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