14
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
Torque Table
Field Wiring
Cover
Interconnecting
Wiring
Indoor Unit Piping
Taper Nut
Wrench
Torque Wrench
Piping
