13 14
INSTALLATION OF REFRIGERANT PIPING
Step 5
Piping Connections to Outdoor Unit
Use refrigeration grade tubing ONLY. No other type of tubing may be used.
Use of other types of tubing will void manufacturer’s warranty. Make sure
there is enough piping to cover the required length between the outdoor
and indoor unit.
Piping Preparation
• Do not open service valves or remove protective caps from tubing ends until all
connections are made.
• Keep tubing free of dirt, sand, moisture and contaminants.
• Insulate each refrigerant pipe and condensate hose with minimum 3/8” (10 mm) wall
thermal pipe insulation.
NOTE: Insulate condensate hose to prevent sweating which may cause water stains
or wall damage.
• Bind refrigerant pipes, condensate hose and interconnecting wire together with cable
ties at 12 inch intervals.
Piping and Drain Hose Connections to Indoor Unit
NOTE: For maximum serviceability, it is recommended to have refrigerant pipe flare
connections and the drain connection on the outside.
1. Feed refrigerant pipes, drain hose and interconnecting wires
assembly through wall hole from outdoor to the indoor space.
2. Set the indoor unit on mounting bracket. Allow the indoor
unit to hinge on the top of the mounting bracket. Do not
lock down bottom of unit to mounting bracket.
3. Adjust the length of the interconnecting wires so that it can
easily reach the indoor unit electrical control box. Route and
fit the interconnecting wires into back side of indoor unit.
INSTALLATION OF REFRIGERANT PIPING
4. Open front cover of indoor unit and remove field wiring terminal block cover.
Route the interconnecting wires to terminal block in control box.
5. Allow interconnecting wires to hang free. Wire connections
will be handled later in these instructions.
6. Adjust the length of condensate drain hose to easily
meet the drain pipe of the indoor unit. Seal and insulate
hose connection to prevent leaks and sweating.
NOTE: Prevent condensate drain hose from sagging or kinking for proper drainage.
7. Adjust the length and carefully bend refrigerant pipes to meet indoor unit refrigerant pipe
connections with proper tools to avoid kinks.
8. Apply a small amount of refrigerant oil to the
flare connection on the refrigerant pipes.
9. Properly align piping and tighten
flare nut using a standard wrench
and a torque wrench as shown
in figure to the right:
10. Carefully tighten flare nuts to correct torque level referring to the following Torque Table:
NOTE: Over tightening may damage flare connections and cause leaks.
11. Apply insulation to refrigerant pipe joints to prevent sweating.
12. Gently and securely lock down bottom of indoor unit
to wall mounting bracket.
Pipe Diameter Nut Size
Tightening Torque
inch (mm) inch (mm) 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
CAUTION
Torque Table
Field Wiring
Cover
Interconnecting
Wiring
Indoor Unit Piping Taper Nut
Wrench
Torque Wrench
Piping
(24 Seiten)
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