Schreiber Chillers 150AC laser - Manual (Page 27)

MAINTENANCE INFORMATION
Part II
NOTICE ON EXPANSION VALVE
This is a standard Alco Expansion Valve, Model #TLCE (size) HW.
These valves come from the factory pre-set. For the proper super heat do
not try to adjust the super heat on this valve unless you call the factory
service department. The Alco valve is one of the most reliable parts. If
this valve needs to be changed out, you do it without losing the R-22
charge. To do this, turn the receiver off at the liquid line to the expansion
valve. Then pump the system down until you just have two or three
pounds of gauge pressure. Remove the power element and install
replacement power element, open the receivers liquid line valve. TEST
FOR LEAKS and restart the unit. Remember, call the factory before you
do any work on the expansion valve.
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150AC