16
P01432Q-rev.1
6. Refrigerant Piping Work
Table 6.1 Piping Size
inch (mm)
Model
Gas Piping
Liquid Piping
(H,Y)IDH072B21S
3/4 (19.05)
3/8 (9.52)
(H,Y)IDH096B21S
7/8 (22.2)
(3) Prepare field-supplied copper pipes.
(4) Select clean copper pipes. Make sure there is no dust and moisture inside.
(5) The refrigerant oil for the refrigerant R410A is susceptible to moisture, an oxide film, and fatty oil. Take
special care during the installation so that moisture, contaminations or old refrigerant oil will not enter
the refrigerant cycle. Otherwise, impurities may adhere to the expansion valve and it may prevent
proper operation.
(6) When cutting the pipes, use a pipe cutter to avoid grind swarf generation for the pipe cutting work. Blow
the inside of pipes with nitrogen or dry air to remove any dust or foreign materials before connecting
pipes. Do not use any tools which produce a lot of swarf such as a saw or a grinder.
6.1 Piping Materials
(1) The tolerance of refrigerant piping length differs depending on the combination with the outdoor unit.
Refer to “Installation and Maintenance Manual” of the outdoor unit for details.
(2) Select the piping size from the following table.
For details on refrigerant piping work, vacuum pump, and refrigerant charge, refer to the "Installation and
Maintenance Manual" for the outdoor unit.
Use the specified non-flammable refrigerant (R410A) to the outdoor unit in the refrigerant cycle.
Do not charge the unit with materials other than R410A, such as hydrocarbon refrigerants (propane
and isobutan), oxygen, flammable gases (acetylene, ammonia, etc.) or poisonous gases when
installing, maintaining and moving the unit. These flammables are extremely dangerous and may
cause explosion, a fire, or injury.
In Case of Getting the Pipe
Through a Hole in the Wall
Correct
Correct
Incorrect
Incorrect
Correct
Incorrect
Hole
Hole
Attach a cap or put a plastic bag
over the pipe end.
Attach a cap or put a plastic
bag over the pipe end.
Attach a cap or put a plastic
bag over the pipe end.
Rubber Band
Do not lay the pipe
directly on the ground.
Rain water
can come in.
In Case of Rain
