Gree MULTI21 CAS12HP230V1AC, Installation Manual

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INSTALLATION OF REFRIGERANT PIPING
Step 5 - Piping Connections to Ceiling Cassette
CAUTION
Use refrigeration grade piping ONLY. Uses of other pipingwill void the Manufacturer’s Warranty.
Piping Preparation
1. Do not open service valves or remove protective caps on pipes until all connections are made.
2. Keep tubing free of dirt, sand, moisture and contaminants.
3. Insulate each refrigerant pipe and condensate hose with minimum 3/8” (10 mm) wall thermal pipe
insulation.
NOTE
: Insulate condensate hose and/or pipes to prevent sweating which may cause water
stains or wall damage.
4. Bind refrigerant pipes, the condensate hose and interconnecting cable together with cable ties at
12-inch intervals.
Connecting Refrigerant Pipes to Ceiling Cassette
1. Feed refrigerant pipes, drain hose and interconnecting wires assembly through wall hole from
outdoor to the Ceiling Cassette.
2. Adjust the length and carefully bend refrigerant pipes to meet indoor unit refrigerant pipe
connections with proper tools to avoid kinks.
3. Apply a small amount of refrigerant oil to the flare connection on the refrigerant pipes.
Torque Table
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
4. Properly align piping and tighten flare nut using a standard wrench and a torque wrench as
shown in figure to the below. Carefully tighten flare nuts to correct torque level referring to the
following Torque Table:
NOTE
: Over tightening may damage flare connections and cause leaks.
5. Apply pipe insulation to entire refrigerant pipe and joints to prevent sweating.
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