Welbilt FB081TF, Service Manual

Page: 83 / 96

Part Number REV00 04/08/2020 83
Section 7 Component Check 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 (air cooled only)
• High pressure cut-out control
• Low Pressure cut-out control
• High side service valve
• Low side service valve
Important
This is a required in-warranty repair procedure.
1. Disconnect power.
2. Follow all manufacturer’s instructions supplied with
the pinch-off tool. Position the pinch-off tool around
the tubing as far from the pressure control as feasible.
Clamp down on the tubing until the pinch-off is
complete.
n
Warning
Do not unsolder a defective component. Cut
it out of the system. Do not remove the pinch-
off tool until the new component is securely in
place.
3. Cut the tubing of the defective component with a small
tubing cutter.
4. Solder the replacement component in place. Allow the
solder joint to cool.
5. Remove the pinch-off tool.
6. Re-round the tubing. Position the flattened tubing in
the proper hole in the pinch-off tool. Tighten the wing
nuts until the block is tight and the tubing is rounded.
NOTE: The pressure controls will operate normally once the
tubing is re-rounded. Tubing may not re-round 100%.
USING PINCH-OFF TOOL