Hitachi UTOPIA R32 Series - 5.6 Suspension of Refrigerant Piping; 5.7 Line Branch and Header Branch Installation

22
PMEN0654 rev.0 - 12/2023
5
SUSPENSIONOFREFRIGERANTPIPING
REFRIGERANT PIPING AND REFRIGERANT CHARGE
 NOTE
• Do not use insulaon material that contains NH
3
because it can damage cooper pipe material
and can be a source of future leakage.
• Where polyethylene foam insulaon is used, a 10 mm thick layer should be used for the liquid
pipe and between 15 and 20 mm for the gas pipe.
• Insulate the liquid piping completely to avoid a decrease of performance; if not, it will cause
sweang on the surface of the pipe.
• Install the insulaon aer the pipe surface temperature has dropped to the same temperature
as that of the room, otherwise the insulaon may melt.
• Where the er has supplied his own branches, these should be appropriately insulated to avoid
decreases in capacity in line with to environmental condions and dew on the surface of the
piping due to low pressure.
5.6 Suspension of Refrigerant Piping
Suspend the refrigerant piping at certain points and
prevent the refrigerant piping from touching the
weak part of the building such as wall, ceiling, etc…
(If touched, abnormal sound may occur due to the
vibraon of the piping. Pay special aenon in case
of short piping length).
Do not x the refrigerant piping directly with the
metal ngs. (The refrigerant piping may expand
and contract).
Some examples for suspension method are shown
below.
For suspending
heavies
For piping along
the wall
For instant
installaon work
1 ~ 15m
Indoor unit
Points where the
refrigerant pipes
pass through the
dierent structural
parts of the building.
(Fire-Proof secon
treatment)
5.7 Line branch and header branch installaon
Install the distributor supplied by Hitachi on request.
A tee can not be installed instead of a branch pipe.
Fix the branch pipe horizontally to the pillar, wall or ceiling. Piping must not be xed rigidly to the
wall as thermal expansion and contracon can cause pipe fracture.