17 | Piping installation
Installer and user reference guide
74
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
17.2.8 To protect against contamination
Protect the piping as described in the following table to prevent dirt, liquid or dust
from entering the piping.
Unit Installation period Protection method
Outdoor unit >1month Pinch the pipe
<1month Pinch or tape the pipe
Indoor unit Regardless of the period
Seal the piping and wiring intake holes using sealing material (field supply),
otherwise the capacity of the unit will drop and small animals may enter the
machine.
Example: passing piping out through the front.
a Close the areas marked with " ". (When the piping is routed from the front
panel.)
▪ Only use clean pipes.
▪ Hold the pipe end downwards when removing burrs.
▪ Cover the pipe end when inserting it through a wall, to prevent dust and/or
particles entering the pipe.
17.2.9 To braze the pipe end
NOTICE
Precautions when connecting field piping. Add brazing material as shown in the
figure.
▪ When brazing, blow through with nitrogen to prevent creation of large quantities
of oxidised film on the inside of the piping. This film adversely affects valves and
compressors in the refrigerating system and prevents proper operation.
▪ Set the nitrogen pressure to 20kPa (0.2bar) (just enough so it can be felt on the
skin) with a pressure-reducing valve.
a Refrigerant piping
b Part to be brazed
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