Hitachi RPC-4.0FSR - Page 36

6 When on-site piping with joint such as elbow, socket is
buried, provide a service access door to facilitate the check
for connecting part.
7 Perform to support for earthquake resistant to the pipes in
order not to damage by an external force.
8 Do not clamp tightly the refrigerant pipe when supporting for
prevention of heat stress.
9 Do not touch the refrigerant pipes to low strength portions
of walls or ceilings. If not, it may cause abnormal sound or
vibration.
10 Perform the air tight test. The air tight procedures should be
performed according to Installation and Operation Manual of
the outdoor unit.
11 Insulate each are connection without gap to prevent of dew
condensation by using the accessory thermal insulation pipe.
Additionally, insulate eld gas and liquid pipings by using
eld-supplied thermal insulations.
Unit
side
Check no clearance between the
indoor unit and the insulation.
Insulation material
(factory-supplied)
Insulation for refrigerant pipe
(eld-supplied)
Refrigerant pipe
(eld-supplied)
Fix the vinyl tape position at the vertical part
(insulation for refrigerant pipe (accessory)
Fasten 3 places of the
pipe by cord clamps
(accessory)
Fasten securely cord clamps and the
vinyl tape in order to prevent the pipe
from dew condensation
12 When the thickness of insulation for gas piping is 20mm,
attach the insulation moving to the indoor unit side as shown
in the gure. When attaching, wrap the insulation without gap
between the insulation and local piping insulation.
Indoor
unit
Cord clamp
Wrap tape without gap.
Refrigerant pipe
(eld-supplied)
Insulation for refrigerant pipe
(eld-supplied)
Insulation (attached to indoor unit)
Insulation (accessory)
! CAUTION
Do not apply excessive force to the are nut when tightening. If applied,
the are nut may crack due to aged degradation and refrigerant leakage
may occur. Use the specied tightening torque.
13 If using a forming agent (recommended Gupoex) after
installing the air panel, avoid touching the forming agent to
the air panel. If the forming agent is touched to the air panel,
it may cause the breakage and the falling of the air panel. In
this case, completely wipe o󰀨 the touched forming agent.
? NOTE
• Cap the end of the pipe when the pipe is to be inserted through a hole.
• Cap the end of the pipe to avoid rain or water entering.
• Do not put pipes on the ground directly without a cap or vinyl tape at
the end of the pipe.
Correct Incorrect
14 Evacuation and refrigerant charging procedures should be
performed according to Installation and Operation Manual of
the outdoor unit.
REFRIGERANT PIPING WORK
PMML0551 rev.4 - 07/2023 - A10762310A
20