Refrigerating Specialties Division
8
Maintenance and Service
Dirt in the system is the greatest single cause of regulator
malfunction. All screens or fi lters must be cleaned or replaced
when they become dirty. At start up, or when changes or additions
are made, it is especially important that these items are cleaned
or changed frequently. When the RSW companion strainer or
13mm (1/2”) pilot circuit strainer is used, maintain according to
instructions in Bulletin 00-10. Moisture in halocarbon systems,
in particular, can cause corrosion or form ice, causing the
Piston to freeze in position. Filter-driers should be used and
maintained for halocarbon systems.
Before deciding to disassemble a regulator for servicing, the
following investigations should be made:
Check the Manual Opening Stem; it should be turned out
(counterclockwise) for automatic operation.
Check the regulator setting to make sure it is properly
adjusted. Turn Adjusting Screw slowly to see if the regulator
responds. Check regulator pressure range; if wrong, range
spring must be changed or a Vacuum Cartridge installed.
Check other system components for proper operation.
Check hand valves in the system to make sure they are open
or closed as required and the system is receiving liquid or
vapor as the case may be.
Before disassembly of Regulator, make certain that all
refrigerant has been removed (pumped out) from the
regulator and its corresponding Strainer where one is used.
Read Safety Bulletin RSB.
Fig. 7-2
