DC Inverter U-match Series Cassette Type Unit
29
refrigerant and corrode the copper pipe-work.
If a leak is suspected, all naked flames shall be removed/extinguished. If a
leakage of refrigerant is found which requires brazing, all of the refrigerant shall be
recovered from the system, or isolated (by means of shut off valves) in a part of the
system remote from the leak. Oxygen free nitrogen (OFN) shall then be purged
through the system both before and during the brazing process.
3.2.5 Refrigerant Adding
NOTICE
Before and during operation, use an appropriate refrigerant leak detector to monitor
the operation area and make sure the technicians can be well aware of any
potential or actual leakage of inflammable gas. Make sure the leak detecting device
is applicable to inflammable refrigerant. For example, it should be free of sparks,
completely sealed and safe in nature.
See the following table for the amount of additional refrigerant.
Item
Model
Standard
Pipe
Length
Unnecessary
Charge Pipe
Length
Additional Refrigerant
Amount for Extra Pipe
GUD35W/NhA-T
5.0m
≤
7.0m
16g/m
GUD50W/NhA-T
GUD71W/NhA-T
40g/m
GUD85W/NhA-T
GUD100W/NhA-T
GUD100W/NhA-X
GUD125W/NhA-T
GUD125W/NhA-X
GUD140W/NhA-T
7.5m
≤
9.5m
GUD140W/NhA-X
GUD160W/NhA-X
3.2.6 Installation of Drain Pipe
3.2.6.1 Indoor Side Drainage Pipe
(1) Keep pipe size equal to or greater than that of the connecting pipe
(2) Install the drain piping as shown and take measures against condensation.
