Chigo SA-ZM03ENG-1 Instruction Manual page 19

Note: When the height is more than 5m, set the oil trapping bend and non-return bend according to relative
positions of outdoor unit and indoor unit.
Oil trapping bend
Outdoor unit
When the installation position of
indoor unit is higher than outdoor unit
3. Piping sequence
A. Keep the check valve or ball valve of outdoor unit closed (factory delivery specification) and separately
remove the nuts, dustproof cap and piping screw plugs of indoor and outdoor pipelines.
① Quickly fulfill the bell mouth connection operation; if placed for long time, the dust, moisture and foreign
matter may ingress and therefore lead to the failure.
②
Before tightening the bell mouth, apply a thin layer of refrigeration oil on the sealing fitting
Pipe diameter φ(mm)
6.35
9.52
12.7
15.88
19.05
B. Conduct the bell mouth connection operations in sequence and connect all refrigerant pipeline.
After connection of pipe, it must be filled with nitrogen or refrigerant; check the air leak with leak detector
or soap water.
C. Vacuumize the overhaul port of check valve or ball valve of outdoor unit and discharge the air.
(Operate by professional installation)
4.Installation of unit
Non-return bend
Gas pipe
Indoor unit
Liquid pipe
Tightening torque (kgfm)
1.4～1.7
1.4～1.7
4.8～6.2
4.8～6.2
6.9～9.9
Non-return bend
Gas pipe
Oil trapping bend
Liquid pipe
Indoor unit
When the installation position of indoor
unit is lower than outdoor unit
Fix
17
Outdoor unit
surface of pipe
Notice:
Use two wrenches,
one as common wrench
and the other is torque
wrench.