15
INSTALLATION OF REFRIGERANT PIPING
Step 6
Piping Connections to Outdoor Unit
1. Remove service valve cover (if provided) to
access the service valves and refrigerant ports.
2. Carefully bend and adjust length of refrigerant
pipes to meet outdoor unit service valves
connections with proper tools to avoid kinks.
NOTE:
Use proper techniques to cut and re-flare refrigerant pipes, if required.
An R410A Flaring Tool is required for re-flaring refrigerant pipes.
3. Apply a small amount of refrigerant oil to the flare connection on the refrigerant pipe.
4. Properly align piping and tighten flare nut using a standard wrench and a torque
wrench as shown in the indoor piping section.
5. Carefully tighten flare nuts to correct torque level referring to the following Torque Table:
NOTE:
Over tightening may damage flare connections and cause leaks.
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
Torque Table
Service
Valve Cover
