VESSER CGU12N, Service Instructions Manual, Page: 66 / 177

63
QSPEVDU
3 REFRIGERATION PIPING WORK
3.1 Refrigeration Piping Work Procedures
1. Connecting pipelines
‹ Connection pipes must be in accordance with the following requirements: the basic principle --- keeping
dry, clean and no leakage inside.
Dry Clean Air tight
Make syre there is no moisture inside the
pipes
Make sure there is no dirt inside the pipe
Make sure the refrigerant does not leak
out
Moisture
(V0965)
Dirt
(V1148)
Leak
(V1149)
Figure 3-1-1
‹
$OLJQFRSSHUSLSHÀDUHZLWKWKHFHQWHURIVFUHZHGFRQQHFWRUDQGWLJKWHQIXOO\WKHQXWRIWKHÀDUHE\KDQG
‹ 7LJKWHQWKHÀDUHQXWZLWKDWRUTXHVSDQQHUXQWLOWKHWRUTXHVSDQQHUPDNHVDFOLFNDVVKRZQLQ)LJXUH
1. Moment needed for tightening a nut is shown in Tab. 3-1-1.
Fitting Pipe for Indoor Unit Flaring Nuts Fitting pipe
Torque Spanner
Spanner
Figure 3-1-2
Form 3-1-1 the tightening torque needed for tightening nut
Pipe diameter Tightening torque
1/4" 15-30 (N·m)
3/8" 35-40 (N·m)
5/8" 60-65 (N·m)
1/2" 45-50 (N·m)
3/4" 2-75 N·m)
‹ Curvature of piping shall not be too small, or otherwise piping may be broken. So installation personnel