Hitachi SET FREE-Serie Bedienungsanleitung Seite 32

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PIPING WORK AND REFRIGERANT CHARGE

Ⓑ First branch

outdoor unit HP

total indoor unit HP

Ⓓ Header branch

number of header

total indoor unit HP

 Diameter of the main pipe (from the base of the unit or

connection kit 1 to the first branch).

equivalent pipe length < 100 m

outdoor unit (HP)

When the maximum length of the equivalent refrigerant pipe from the

piping connection kit 1 to the indoor unit is over 100m, the pipe size

of gas and liquid lines from the piping connection kit 1 to first branch

should be increased by one size with reducers (field-supplied).

PMML0479 rev.2 - 02/2018

 Pipe diameter after first branch or between Multi-Kits in the

main branch.

total indoor unit capacity after the

first branch (HP)

In the case that the piping length from the Multi-Kit at the first branch

to the terminal indoor unit is over 40m, the size of the main piping

should be increased by one size with reducers (field-supplied). Refer

to "Piping Branch Restriction" for details.

Even if the equivalent refrigerant piping length is more than 100m, no

need to increase the pipe size after first branch. If the Multi-Kit size is

larger than the first branch, adjust the Multi-Kit size to the first branch.

In case that the selected pipe size after the first branch is larger than

the pipe size before the first branch, use the same pipe size as before

 Pipe diameter between Multi-Kit and indoor unit.

indoor unit (HP)

(*): When the liquid piping length is longer than 15m, use ø9.52 pipe

and reducer (field-supplied).

The pipe diameter should be the same as the indoor unit piping

connection size.

Check the corresponding Indoor unit connection sizes.