Lennox VEP034N432US - Indoor and Outdoor Pipe Connection Procedures

DC Inverter Multi VRF System
16
4.3.4 Indoor Pipe Connection
(1) Remove pipe cover and pipe plug.
(2) Direct the flared part of copper pipe to the center of screwed joint. Twist on the flared nut
tightly by hand, as in Fig.16 (Make sure indoor pipe is correctly connected. Improper location
of the center will prevent flared nut from being securely twisted. Thread of nut will get
damaged if the flared nut is twisted forcibly).
(3) Use torque wrench to twist on the flared nut tightly until the wrench gives out a click sound
(Hold the handle of wrench and make it at right angle to the pipe. as in Fig.17).
(4) Use sponge to wrap the un-insulated connection pipe and joint. Then tie the sponge tightly
with plastic tape.
(5) Connection pipe should be supported by a bearer rather than the unit.
(6) The bending angle of piping should not be too small, otherwise the piping might have cracks.
Please use a pipe bender to bend the pipe.
(7) When connecting IDU with connection pipe, do not pull the big and small joints of IDU with
force in case the capillary tube or other tubes have cracks and cause leakage.
Pipe dimension
Tightening torque
Φ6.35mm
15~30(N·m)
Φ9.52mm
35~40(N·m)
Φ12.7mm 45~50(N·m)
Φ15.9mm 60~65(N·m)
Fig. 16 Fig. 17
4.3.5 Outdoor Pipe Connection
Twist the flared nut on the connection pipe of outdoor valves. Twisting method is the same as for
indoor pipe connection.
During engineering installation, the connection pipe inside the unit must be wrapped by insulation
sleeve.