YMGI: Your Modern Green Idea
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
28
Indoor Unit Pipe Connections
1. Feed refrigerant pipes, drain hose and communication
cable assembly through wall hole from outdoor to the
Ceiling Cassette.
2. Pull the piping assembly to the indoor unit. Carefully
bend refrigerant pipes to meet indoor unit connection
ports. Use proper tools to avoid kinks.
3. Add a small amount of refrigerant oil to both ends of
the flare fittings.
4. Starting with either refrigerant pipe, carefully center the
pipe to the indoor unit connection port then hand
tighten the flare nut.
5. Repeat procedure with remaining pipe.
6.
Tighten both flare nuts using a standard wrench and a
torque wrench as shown below.
7.
Carefully tighten flare nuts to correct torque level referring to the Torque Table below.
Pipe Diameter
inch (mm)
Nut Size
inch (mm)
Tightening Torque
ft-lbs
N-m
1/4”
(6.35)
1/4”
(17)
10 to 13
14 to 18
3/8
(9.5)
3/8”
(22)
25 to 30
34 to 42
1/2”
(12.7)
1/2”
(25)
36 to 45
49 to 61
5/8 “
(15.9)
5/8”
(29)
50 to 60
68 to 82
Over tightening may damage flare connections and cause leaks.
8.
Individually insulate each bare refrigerant pipe and joint as shown below to prevent sweating.