Purpose: To properly adjust throttling valves.
Adjustment Procedure
1. Pump down the compressor or the low side and adjust compressor crankcase pressures to approximately one pound positive.
2. Remove the square end of the throttling valve to change the spring or to add or remove shims. Adding shims increases pressure and removing shims decreases pressure approximately 1/2 pound per shim.
NOTE: While shims may be used to make minor pressure adjustments, always install a new spring if more than a one pound change is required.
3. Always recheck the setting after making changes.
