Guidelines When Connecting The Refrigerant Piping - Daikin RXTM30R2V1B Installer's Reference Manual

7.2.3 Guidelines when connecting the refrigerant piping

RXTM-R_RXTP-R_ARXTP-R_RXTA-B
R32 split series
4P518023-11H – 2021.03
Unit
Outdoor unit
Indoor unit
INFORMATION
Do NOT open the refrigerant stop valve before checking the refrigerant piping. When
you need to charge additional refrigerant it is recommended to open the refrigerant
stop valve after charging.
WARNING
Connect the refrigerant piping securely before running the compressor. If the
refrigerant piping is NOT connected and the stop valve is open when the compressor
is run, air will be sucked in. This will cause abnormal pressure in the refrigeration
cycle, which may result in equipment damage and even injury.
Take the following guidelines into account when connecting pipes:
▪ Coat the flare inner surface with ether oil or ester oil when connecting a flare
nut. Tighten 3 or 4 turns by hand, before tightening firmly.
▪ ALWAYS use 2 wrenches together when loosening a flare nut.
▪ ALWAYS use a spanner and torque wrench together to tighten the flare nut when
connecting the piping. This to prevent nut cracking and leaks.
a b
c
d
a Torque wrench
b Spanner
c Piping union
d Flare nut
Piping size (mm) Tightening torque
Ø6.4
Ø9.5
Installation period
>1 month
<1 month
Regardless of the period
Flare dimensions
(N•m) (A) (mm)
15~17 8.7~9.1
33~39 12.8~13.2
7 Piping installation
|
Protection method
Pinch the pipe
Pinch or tape the pipe
Flare shape (mm)
90°
±2
ØA
R=
0.4~0.8
Installer reference guide
35