15
Screw Connection
Pipe Diameter inch (mm)
Tightening Torque ft-lb (N-m)
Ø 1/4 (6.35)
11.06 - 22.13 (15 - 30)
Ø 3/8 (9.53)
25.82 - 29.5 (35 - 40)
Ø 1/2 (12.7)
33.19 - 36.88 (45 - 50)
Ø 5/8 (15.88)
44.25 - 47.94 (60 - 65)
Ø 3/4 (19.05)
51.63 - 55.32 (70 - 75)
Ø 7/8 (22.23)
59 - 62.69 (80 - 85)
Vacuum and Refrigerant Leakage Detection
NOTICE
Do not purge the air with refrigerant. Use a vacuum pump to vacuum the installation!
1. When connecting refrigerant pipe to the unit or removing it from the unit, please use
both a back-up wrench and the torque wrench.
2. When connecting, place the equipment specified oil type on the backside of the copper
tube flare prior to tightening. Do not place oil on the flare face, as this will promote
system contamination, tighten it by hand and then tighten it with the spanner or
adjustable wrench.
3. Refer to the torque reference table within this document before tightening to determine
the appropriate torque (over-tightening will damage the nut and lead to leakage).
4. Use dry Nitrogen to pressurize the piping circuit with 150 PSIG and allow it to hold while
performing other installation processes. It is recommended to apply a soap bubble
solution and observe the connection.
5. Evacuate each individual refrigeration circuit to 350 microns or below, and close off the
valve to the vacuum pump. If the pressure rises above 500 microns within one minute,
but not above 1500 microns within 5 minutes, moisture is present. If the pressure
continues to rise above 1500 microns, a leak exists in the circuit being tested.
a) If moisture is present, use triple evacuation process to eliminate the moisture.
b) If a leak is present, leak check all joints and piping.
Installation
