Trane MWC518 Installation & Operation Manual page 16

Unit Installation
Refrigerant pipe connection
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Figure 10.
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As shown in fig. 10, use wrench and torque wrench simultaneously for removing or
installing pipes.
Apply refrigerating engine oil on the tapered nut inside and outside, and then tighten it
after 3-4 turns manually.
Tightening torque see table. 1 (over tighten may damage the nut and cause leakage)
As shown in fig. 10, check the connecting pipe for air leakage and take heat insulation
measures.
Wrap joints of air pipe and air collector pipe insulating sleeve with the sponge.
Apply refrigerating
engine oil
Torque wrench
Pipe joint
Tapered nut
Table 1. Torque for tighten the nut
Wall thickness
Diameter
Ø6.35mm ≥ 0.5
Ø9.52mm ≥ 0.71
Ø12.7mm ≥ 1
Ø15.9mm ≥ 1
Ø19.05mm ≥ 1
Sponge (accessory)
(Wrap pipe joints with seal)
Cable tie (x4)
Wrench
Air collector pipe
Liquid inlet pipe
Tightening torque
(mm)
15-30 (N•m)
30-40 (N•m)
45-50 (N•m)
60-65 (N•m)
70-75 (N•m)
Liquid inlet pipe
insulating sleeve (accessory)
(For liquid pipe)
Air collector pipe
insulating sleeve (accessory)
(For air pipe)
AMS-SVX02A-EN