International comfort products DLFBHF09K1A Owner's Manual page 22

Installation of indoor unit
Connecting the refrigerant pipe
1)Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leaks.
Coat here with refrigeration oil
2)Align the centres of both flares and tighten the flares and tighten the flare nuts 3 or 4 turns by hand.
Then tighten them fully with the torque wrenches.
3)To prevent gas leakage, apply refrigeration oil on both inner and outer surfaces in the flare. (Use refrigeration oil for
R410A.)
Flare nut tightening torque
Gas side
09K/12K
3/8 inch
42~47.46 ft.lb
(31~35 N.m)
Caution on piping handling
1)Protect the open end of the pipe against dust and moisture.
2)All pipe bends should be as gentle as possible. Use a pipe bender for
bending.
(Bending radius should be1 1/6 in (30 mm) to1 4/7 in (40 mm) or larger.)
Selection of copper and heat insulation materials
When using commercial copper pipes and fittings, observe the
following:
1)Insulation material: Polyethylene foam
Heat transfer rate:0.041 to 0.052W/mK(0.035 to 0.045kca/(mh
Refrigerant gas pipe's surface temperature reaches 230℉(110℃) max.
Choose heat insulation materials that will withstand this temperature.
2)Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
Gas side
09K/12K
O.D. 3/8 in (9.55 mm) O.D. 1/2 in (12.7 mm) O.D. 1/4 in (6.4 mm)
Thickness 0.03 in (0.8 mm)
3)Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
421 02 9260 00
Liquid side
18K 09K/12K/18K
1/2 inch 1/4 inch
20.34~27.12 ft.lb
67.8~74.58 ft.lb
(15~20 N.m)
(50~55 N.m)
Liquid side
18K
Specifications are subject to change without notice.
Wrench
Indoor unit tubing
Gas pipe
Gas pipe
insulstion
Gas pipe thermal insulation
09K 18K
I.D. 1/2-3/5 in (12-15 mm) I.D. 5/9-5/8 in (14-16 mm) I.D. 1/3-2/5 in (8-10 mm)
Thickness 2/5 in (10 mm) Min.
INSTALLATION INSTRUCTIONS
Open-end wrench (fixed)
Flare nut
Connection pipe
Be sure to
place a cap.
If no flare cap is
available,cover
the flare mouth
with tape to keep
dirt or water out.
Inter-unit wiring
Finising tape
Liquid pipe
thermal insulation
22
Liquid pipe
Liquid pipe
insulation