Back-up Wrench
6. After evacuation is complete, additional charge can be added.
a. If no additional charge is required, break the vacuum with refrigerant, then remove
the gauge connectors.
b. Slightly open the liquid valve at the OD unit, allow system to equalize, then fully open
the liquid valve and then open the vapor service valve.
7. After leak checking is complete, apply thermal insulation around the are connections and
all exposed refrigeration pipes. Refer to the guidelines for insulating refrigerant piping and
connections in this manual for additional information.
a. Seal the insulation.
b. Inspect the insulation to assure no breakages are present.
Pipe Diameter in. (mm) Tightening Torque
1/4 (6.35) 11.25-14.75 ft-lbf / 15 ~ 20 N•m
3/8 (9.52) 22.25-29.50 ft-lbf / 30 ~ 40 N•m
1/2 (12.7) 33.25-40.50 ft-lbf / 45 ~ 55 N•m
5/8 (15.9) 44.25-47.75 ft-lbf / 60 ~ 65 N•m
16 88-M4MHW18-1C-EN
Installer's Guide
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