Figure 5-26. Pressure testing and evacuating the refrigerant system. (Sheet 3 of 3)

STEP 4. CONNECT HOSE FROM PRESSURE TESTING HOOKUP LOOSELY TO SUCTION SERVICE

VALVE OPEN/NITROGEN DRUM SHUTOFF VALVE SLIGHTLY TO PURGE HOSE. TIGHTEN

CONNECTION AT SUCTION SERVICE VALVE. OPEN SHUTOFF VALVE AND SUCTION

SERVICE VALVE. BUILD UP SYSTEM PRESSURE UNTIL THE DISCHARGE PRESSURE

REACHES 150 PSIG. CLOSE SUCTION SERVICE VALVE AND SHUTOFF VALVE. DIS-

CONNECT HOSE FROM SUCTION SERVICE VALVE. CLOSE DISCHARGE SERVICE VALVE

AND REMOVE GAGE.

STEP 5. TEST FOR LEAKS (2 ABOVE). PURGE THE REFRIGERANT SYSTEM (3 ABOVE).

STEP 6. REMOVE CAP FROM DISCHARGE SERVICE VALVE. ATTACH A SUITABLE VACUUM

PUMP TO SUCTION SERVICE VALVE ANO A MANOMETER TO THE DISCHARGE SERVICE

VALVE. OPEN THE SERVICE VALVES AND OPERATE THE VACUUM PUMP UNTIL THE

MANOMETER INDICATES 2.5 MM HG. ABS. (MILLIMETERS OF MERCURY, ABSOLUTE).

STEP 7. CLOSE THE SUCTION SERVICE VALVE AND STOP THE PUMP. ATTACH HOSE FROM RE-

FRIGERANT DRUM, PURGE AIR FROM LINE WITH REFRIGERANT AND SLOWLY BREAK

THE VACUUM BY OPENING THE SUCTION SERVICE VALVE UNTIL 760 MM HG ABS.

CLOSE SUCTION SERVICE VALVE.

STEP 8. REMOVE REFRIGERANT DRUM AND CONNECT VACUUM PUMP TO SUCTION SERVICE

VALVE. PURGE AIR FROM HOSE, START PUMP AND OPEN SUCTION SERVICE VALVE.

OPERATE PUMP UNTIL MANOMETER AGAIN READS 2.5 MM HG ABS.

STEP 9. CLOSE SUCTION SERVICE VALVE AND ALLOW UNIT TO STAND UNDER VACUUM FOR

APPROXIMATELY 12 HOURS. IF NO NOTICABLE RISE IN PRESSURE OCCURS, THE

SYSTEM IS READY FOR CHARGING. CLOSE SERVICE VALVES AND REMOVE VACUUM

PUMP AND MANOMETER. INSTALL CAPS.

NOTE: RISE IN PRESSURE WILL BE INFLUENCED BY AM BlENT TEMPERATURE. MAKE SURE

VACUUM IN SYSTEM IS COMPLETELY RELIEVED BEFORE CHARGING.

NOTE: THE CONDENSER FAN MOTOR SUPPORT HAS BEEN REDESIGNED ON LATER MODELS.

THE BENDIX-WESTINGHOUSE OVERLOAD PROTECTOR AND HEATER THERMOSTAT

REMAINS UNCHANGED.

MEC 4120-222-1574-26 z

Figure 5-26. -Continued, (Sheet 3 of 3)

AGO 20053A