Carrier p3 series - Piping, Air Purge, and Leak Checks

a. Remove the indoor pipe flare nut. ( Check that there is no debris inside. )
b. Align the center of the flare surface, and tighten the indoor pipe union and connection pipe
flare nut with a torque wrench or double-ended wrench. ( Figure. 14 )
While aligning the center of the flare surface, tighten the nut by hand, hold the union side with a
wrench and tighten the nut according to the specified tightening torque with a torque wrench.
Torque wrench or
double-ended wrench
Outdoor side
Indoor side
Figure 14
Pay careful attention to the following points when installing the refrigerant pipes.
• Hold the pipe with one wrench while tightening the connections with a torque
wrench or double-ended wrench.
Be careful not to damage the flare nut threads.
• If the tightening torque is insufficient, gas will leak from the connection.
• If it is too strong, the flare will be damaged.
Tighten the nut with the torque shown in Table 1.
• Do not bend the pipe more than three times at one place.
• When extending the rolled pipe, straighten the pipe by unwinding as shown in Figure 13.
Figure 13
• Repeat the procedure for flaring the tube to connect to the outdoor unit.
• Tighten the flare nut of the connection pipe at the outdoor unit valve. ( Figure. 15 )
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1) Connecting Pipe to the Indoor Unit
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2) Connecting the Interconnecting Pipe to the Outdoor Unit Valve
Flare nut Tightening torque(kgf-cm)
6.35mm (1/4”) 150 ~ 200
12.7mm (1/2”) 500 ~ 550
15.88mm (5/8”) 700 ~ 760
Table 1
Figure 15
Interconnecting
pipework
(Gas pipe)
Three way valve
(Liquid pipe)
Two way valve
CONNECTING THE PIPING