7
■Brazing work
Dx-PMV kit should be connected in liquid pipe line between outdoor unit and 3
rd
party coil. Be sure to check if direction of
piping connection is correct. On the bottom on base box, there is the label which indicates the direction of inlet coming from
outdoor unit and outlet to Dx-Coil.
NOTES
Cautions when brazing of piping on Dx-PMV kit
A) Whilst brazing, the PMV body and PMV head must be cooled to keep the component's temperature below 212°F.
B) Whilst brazing, nitrogen gas must be flowed through the PMV valve and pipework to prevent internal oxidization.
C) Prevent cooling water from getting inside the PMV valve and connector of the lead during brazing.
D) Take care not to damage the PMV cables during brazing.
E) The leakage test is executed by pressurizing nitrogen gas up to 601 psi (4.15MPa).
The test must be done with the service valve of the outdoor unit closed and the gas must be
pressurized at the liquid pipe, gas pipe (suction gas, discharge gas) of the outdoor unit, and
the pressure of the nitrogen gas must not drop for 24 hours.
(For more details, refer to the manual of the outdoor unit.)
Field pipe
(Inlet/Outlet)
R
educe the size from 3/8” to
1/4“ for 015/018 type only.
(Reducer pipe packed in
RBM-A0301GUL)
A: Inlet coming from outdoor unit
B: Outlet to Dx-Coil
