Hitachi UTOPIA R32 Series User Manual

21
PMEN0654 rev.0 - 12/2023
5
REFRIGERANTPIPEINSULATION
REFRIGERANT PIPING AND REFRIGERANT CHARGE
!
CAUTION
• Do not braze on refrigerant pipes without a dry nitrogen gas injecon system. Otherwise, a layer
of rust will form that may become detached when the refrigeraon system is started, causing
lter or compressor blockages.
• NEVER USE oxygen, acetylene or uorocarbonated gas to replace nitrogen gas: this will cause an
explosion or will generate toxic gas.
•
Keep the nitrogen gas pressure within the indicated values. A rise in the pipe could cause an
explosion.
5.5 Refrigerant pipe insulaon
The refrigerant pipes must be ed with a suitable insulaon system that prevents the increase in
temperature of the refrigerant and the subsequent loss of energy and the condensaon of water
along the enre pipe.
Refrigerant pipes must always be separately insulated, using closed cell insulaon foam designed
especially for refrigeraon. This insulaon foam, supplied by the installer, can be obtained in
dierent formats. The most common is in the form of sheets and rolls of tubes of dierent
diameters.
Furthermore, all connecons between the dierent secons of insulaon tubes must be reinforced
with adhesive tape of the same characteriscs.
Fasten securely cord clamps and
the vinyl tape in order to prevent
the pipe from dew condensaon
Fix the vinyl tape posion at the vercal part
(Insulaon for refrigerant pipe (eld-supplied))
Refrigerant pipe
(eld-supplied)
Fasten 3 places of the
pipe by cord clamps
(eld-supplied)
Insulaon for refrigerant pipe
(eld-supplied)
Insulaon material
(factory-supplied)
Check no clearance between the indoor
unit and the insulaon
Unit side
! CAUTION
• On compleng the installaon of the refrigerant pipes, insulate the unions and are-nuts at
the piping connecon part completely, insulate them appropriately using suitable insulang
material and seal the open space between the holes made and the pipe.
• For units with air panel: If coang the oponal air panel with a forming agent (recommended
Gupoex) aer installaon, make sure that the forming agent does not contact it. Otherwise, it
could cause a breakage of the panel, resulng in the panel falling. If the forming agent contacts
the air panel, completely wipe it o.

Hitachi UTOPIA R32 Series Specifications

General

Brand	Hitachi
Model	UTOPIA R32 Series
Category	Air Conditioner
Language	English