Figure 4-5. Installation and removal of pressure gages

TM 5-4120-356-14

INSTALLATION OF PRESSURE GAGES

MAKE SURE THAT THE CAP NUTS ON BOTH SERVICE VALVES ARE TIGHT.

2. CONNECT A CYLINDER OF R-22 REFRIGERANT TO THE CENTER CONNECTOR OF THE MANIFOLD ASSEMBLY. SET

THE CYLINDER UPRIGHT SO ONLY GAS WILL BE DRAWN OFF.

3. MAKE SURE THAT ALL VALVES ARE CLOSED.

4. REMOVE CAPS FROM THE SUCTION PRESSURE SERVICE VALVE AND THE DISCHARGE PRESSURE SERVICE VALVE.

5. CONNECT CHARGING LINE FROM THE SUCTION PRESSURE SIDE OF THE MANIFOLD ASSEMBLY TO THE SUCTION

PRESSURE SERVICE VALVE, LEAVE THE CONNECTION LOOSE AT THE SERVICE VALVE.

6. OPEN SUCTION PRESSURE VALVE STEM AND OPEN CHARGING CYLINDER OUTLET VALVE LONG ENOUGH TO PURGE

ALL AIR FROM THE CHARGING LINE THROUGH THE LOOSE CONNECTION . TIGHTEN CHARGING LINE CONNECTION

AT SUCTION PRESSURE SERVICE VALVE WHEN GAS CAN BE HEARD ESCAPING FROM THE LOOSE CONNECTION.

7. CONNECT CHARGING LINE FROM HIGH PRESSURE SIDE OF MANIFOLD ASSEMBLY TO DISCHARGE PRESSURE

SERVICE VALVE. LEAVE CONNECTION LOOSE AT THE SERVICE VALVE.

8. OPEN DISCHARGE PRESSURE VALVE STEM LONG ENOUGH TO PURGE ALL AIR FROM THE CHARGING LINE THROUGH

THE LOOSE CONNECTION. TIGHTEN CHARGING LINE CONNECTION AT DISCHARGE PRESSURE SERVICE VALVE

WHEN CAN BE HEARD ESCAPING FROM THE LOOSE CONNECTION.

REMOVAL OF PRESSURE GAGES

1. CLOSE ALL VALVES.

2. DISCONNECT THE REFRIGERANT CHARGING LINES FROM BOTH SERVICE VALVES.

INSTALL THE CAPS ON THE DISCHARGE PRESSURE SERVICE VALVE AND THE SUCTION PRESSURE SERVICE

VALVE ,

TS5-4120-356-14/4-5

F i g u r e 4-5. Installation and removal of pressure gages