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Ultra Heat GMV VRF Technical Service Manual INSTALLATION
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The nitrogen flow is above 4-6 L/min (pressure of 0.02 to 0.05 MPa) and must be regulated based
on the pipe caliber.

During welding, nitrogen-filling protection must be conducted; otherwise, the remaining substance in
pipeline will cause blockage or leakage to the system (e.g. electronic expansion valve), which will result
in abnormal operation or even damage the compressor.
1.3.6 Requirements on manifold installation
Manifolds are used to divert refrigerant. There are Y-type manifold (a) and T-type manifold (b).
(a)
(b)
Requirements on manifold installation are as follows:
(1) Ensure that the manifold is close to the IDU to reduce impact on refrigerant assignment by IDU
branches.
(2) The manifold must be that specified by the manufacture and match with the devices.
(3) Ensure that the manifold model is correct.
(4) Manifolds can be laid in the following ways:
1) Y-type manifold must be installed vertically or horizontally. Horizontal installation: The three ports
must be on the same level. The shaping size and assembly angle cannot be changed. Vertical