Suspension Of Refrigerant Piping; Line Branch And Header Branch Installation - Hitachi UTOPIA R32 Series Installation And Operation Manual


NOTE
• Do not use insulation material that contains NH
and can be a source of future leakage.
• Where polyethylene foam insulation 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
sweating on the surface of the pipe.
• Install the insulation after the pipe surface temperature has dropped to the same temperature
as that of the room, otherwise the insulation may melt.
• Where the fitter has supplied his own branches, these should be appropriately insulated to avoid
decreases in capacity in line with to environmental conditions 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
vibration of the piping. Pay special attention in case
of short piping length).
Do not fix the refrigerant piping directly with the
metal fittings. (The refrigerant piping may expand
and contract).
Some examples for suspension method are shown
below.
For suspending For piping along
heavies

5.7 Line branch and header branch installation

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 fixed rigidly to the
wall as thermal expansion and contraction can cause pipe fracture.
PMEN0654 rev.0 - 12/2023
For instant
the wall installation work
because it can damage cooper pipe material
3
1 ~ 15m
Indoor unit
5
Points where the
refrigerant pipes
pass through the
different structural
parts of the building.
(Fire-Proof section
treatment)
22