Replacing Pressure Controls Without Removing Refrigerant Charge - Koolaire KDT0300A Technician's Handbook

11. Charge the system with the proper refrigerant to the
nameplate charge.
12. Operate the ice machine for one hour. Then, check
the pressure drop across the suction line filter-drier.
A. If the pressure drop is less than 2 psig, the filter-
drier should be adequate for complete cleanup.
B. If the pressure drop exceeds 2 psig, change the
suction line filter-drier and the liquid line drier.
Repeat until the pressure drop is acceptable.
13. Operate the ice machine for 48 – 72 hours. Replace
the suction line and liquid line drier if necessary.
14. Follow normal evacuation procedures.
REPLACING PRESSURE CONTROLS WITHOUT
REMOVING REFRIGERANT CHARGE
This procedure reduces repair time and cost. Use it when
any of the following components require replacement, and
the refrigeration system is operational and leak-free.
• Fan cycle control
• High pressure cut-out control
• High side access valve
• Low side access valve
This is a required in-warranty repair procedure.
1. Disconnect power to the ice machine.
2. Follow all manufacturers' instructions supplied with
the pinch-off tool. Position the pinch-off tool around
the tubing as far from the pressure control as feasible.
(See the figure on next page.) Clamp down on the
tubing until the pinch-off is complete.
Part Number STH063 9/17



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