Refrigerant Piping Work; Piping Materials - Hitachi RPC-2.0FSR Installation & Maintenance Manual

5.

Refrigerant Piping Work

This machine uses refrigerant R410A or refrigerant R32.
The type of enclosed refrigerant is described in the specification nameplate and caution nameplate
attached to the outdoor unit. When installing, repairing, or relocating, do not mix substances other
than the refrigerant described on the specification nameplate or caution nameplate attached to
the outdoor unit. Also, do not mix refrigerant R410A and refrigerant R32. Entering non-designated
refrigerants, air, oxygen, flammable substances such as propane or alcohol may cause explosion,
fire or injury.
For the refrigerant piping work, vacuum pump and refrigerant charge, the details shall be referred to
"Installation & Maintenance Manual" of the outdoor unit.
5.1 Piping Materials
(1) The tolerance of refrigerant piping length differs depending on the combination with the outdoor unit.
The details shall be referred to "Installation & Maintenance Manual" of the outdoor unit.
(2) Select the piping size from the following table.
Model
RPC-1.5FSR
RPC-2.0FSR
RPC-2.5FSR
RPC-3.0FSR
RPC-4.0FSR
RPC-5.0FSR
RPC-6.0FSR
(3) Prepare field-supplied copper pipes.
(4) Select clean copper pipes. Make sure there is no dust and moisture inside.
(5) The refrigerant lubricating oil used in these units is Polyvinylether (PVE), a chemically stable, resilient,
synthetic lubricant that, when combined with refrigerant R410A or refrigerant R32, maintains its
compatibility, lubricity, and viscosity over extended periods of time and is impervious to heat, oxidation,
moisture absorption and breakdown as long as it remains in a sealed system. Its chemical properties
will remain intact only so long as moisture is not introduced into the system.
The gaseous element, PVE is a moisture magnet that, once exposed to open air and can
quickly become saturated with moisture, lose its lubricity, and become useless. Minimize
exposure to the open air, over the summer months, and in southern or tropical climates.
(6) Use a pipe cutter to avoid a grind swarf generation for the pipe cutting work. (Do not use a saw or a
grind stone to cut pipes.) Blow the inside of the pipes with nitrogen or dry air, to remove any dust or
foreign materials before connecting pipes.
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Correct
Hole Hole
Attach a cap
or vinyl tape.
14
Gas Piping Liquid Piping
f12.7 (1/2) f6.35 (1/4)
f15.88 (5/8) f9.52 (3/8)
Do not place the pipe
directly on the ground.
Incorrect Correct Incorrect
Attach a cap
or vinyl tape.
mm (in.)
Correct Incorrect
Rain water
can enter.
Attach a cap
or vinyl bag with
rubber band.
A10762300A-rev.1