Figure 4-2. Installation of pressure gages

TM 5-4120-364-13

Figure 4-2. Installation of pressure gages

T u r n valve stem one turn clockwise so gage will register.

g . A f t e r t e s t i n g i s c o m p l e t e d , o r gages are no longer required for other

p u r p o s e s , backseat the suction and discharge service valves on the compressor. Re-

m o v e the gage lines and replace cap and high pressure switch sensing element tube.

O p e n suction and discharge service valves on c o m p r e s s o r fully to return unit to

service.

PUMPING DOWN REFRIGERANT SYSTEM.

4-6.

B e f o r e the refrigerant system can be opened, it is necesary to

a . General.

l i q u i f y a s m u c h r e f r i g e r a n t a s p o s s i b l e a n d c o n t a i n i t in the receiver portion of the

c o n d e n s e r c o i l . T h i s procedure of transferring refrigerent out of the system to the

r e c e i v e r is called pumping down.

To pump down the system, proceed as follows:

( 1 ) Make sure that all valves are open with the exception of the charging

4-5