Connecting the Indoor Unit Assembly Piping
Liquid refrigerant port
A
Gas refrig- erant port
a. When the indoor unit is above the outdoor unit
Indoor unit
There are two refrigerant pipes of differing diameters:
◆A smaller one(6.35mm, 1/4") for the liquid refrigerant
◆A larger one(15.88mm, 5/8") for the gas refrigerant
◆The thickness of tube should not less than 1.0mm(1/16").
◆The inside of copper tube must be clean & has no dust.
The connection procedure for the refrigerant pipes varies according to the exit position of the pipes from the indoor unit, as seen when facing the indoor in the “A” side.
◆Liquid refrigerant port
◆Gas refrigerant port
1 Remove the protection caps on the pipes and connect the assembly pipes to each pipe, tightening the nuts, first manually and then with a wrench, a spanner applying the following torque.
Outer Diameter | Torque (kgf•cm) | ||
6.35 mm (1/4") | 160(11 | 3 | ft•lb) |
5 | |||
15.88 mm (5/8") | 400(29 ft•lb) | ||
Note ◆ If the pipes must be shortened refer to page 45.
2Must use insulator which is thick enough to cover the refrigerant tube to protect the condensate water on the outside of pipe falling onto the floor and the efficiency of the unit will be better.
Outdoor unit |
Oil trap(Must be installed every 6m/20ft)
3Cut off any excess foam insulation.
4Be sure that there must be no crack or wave on the bended area.
5It would be necessary to double the insulation thickness(10mm/ 38 " or more) to prevent condensation even on the insulator when if the installed area is warm and humid.
b. When the outdoor unit is above the indoor unit
Outdoor unit
6Shape an oil trap as shown in figure. The oil trap must be formed every level difference of 6m(20ft).
7For further details on connecting up to the outdoor unit and purging the refrigerant circuit, refer to page 49.
Radius
5cm(2")
Oil trap (suction tube)
Oil trap(Must be installed every 6m/20ft)
Indoor unit
Note ◆ The pipes will be insulated and fixed permanently into position once the whole installation has been tested for gas leaks; refer to page 53 for further details.
