Figure 5-27. Charging the refrigerant system. (Sheet 3 of 3)

STEP 3. OPEN REFRIGERANT DRUM SHUTOFF

VALVE AND OPEN BOTH SERVICE VALVES.

CLOSE HIGH PRESSURE SIDE OF MANIFOLD.

OPERATE UNIT (PAR. 2-11)AND WEIGH IN

3.5 LB CHARGE OF REFRIGERANT-22.

CONTINUE ADDING REFRIGERANT SLOWLY

UNTIL SIGHT GLASS INDICATES FULL.

NOTE: OPERATE UNIT IN COOL POSITION ONLY

DURING SERVICING OPERATION.

STEP 4. PARTIALLY BLOCK DISCHARGE GRILLE

WITH A CARDBOARD BAFFLE. ADJUST

BAFFLE UNTIL SUCTION PRESSURE

GAGE READS 55 PSIG. CONTINUE ADD-

ING REFRIGERANT SLOWLY, WHILE

MAINTAINING 55 PSIG SUCTION PRESSURE

BY ADJUSTING THE BAFFLE, UNTIL THE

DISCHARGE PRESSURE GAGE READING

CORRESPONDS TO THE AMBlENT TEM-

PERATURE IS OBTAINED.

STEP5. CLOSE SERVICE VALVES AND CLOSE RE-

FRIGERANT DRUM SHUTOFF VALVE. STOP

THE UNIT (PAR. 2-10). DISCONNECT MANl-

FOLD HOSES FROM SERVICE VALVES.

NOTE: SET TEMPERATURE CONTROL ABOVE

INSTALL CAPS (STEP 1).

AMBIENTOR ROOM TEMPERATURE.

ME 4120-222-14//5-27 z

Figure 5-27-Ccintinued. (Sheet 3 of 3)

MEC 4120-222-15/4-28

Figure 528. Discharge pressures at constant 55 lb psi suction, ambient temperatures

from 70F. to 120F.