Installation Manual

ManualsBrandsFujitsu ManualsBranch BoxesHFI Primary Branch Box - 3 Ports

Table Of Contents

9380120001-06 EN_D1.pdf

En-4

ABOUT THE UNIT

2.1. Precautions for using R410A refrigerant

The basic installation work procedures are the same as conventional refrigerant models.

However, pay careful attention to the following points:

1 Since the working pressure is 1.6 times higher than that of conventional refrigerant (R22) models, some of the piping

and installation and service tools are special. (See the table below.)

Especially, when replacing a conventional refrigerant (R22) model with a new refrigerant R410A model, always replace

the conventional piping and ﬂ are nuts with the R410A piping and ﬂ are nuts.

2 Be careful that foreign matter (oil, water, etc.) does not enter the piping than with refrigerant models. Also, when storing

the piping, securely seal the openings by pinching, taping, etc.

2.2. Special tools for R410A

Tool name Contents of change

Gauge manifold

Pressure is high and cannot be measured with a conventional (R22) gauge. To prevent

erroneous mixing of other refrigerants, the diameter of each port has been changed.

It is recommended the gauge with seals –0.1 to 5.3 MPa (30 in.Hg to 768 psi) for high

pressure. –0.1 to 3.8 MPa (30 in.Hg to 551 psi) for low pressure.

Charge hose To increase pressure resistance, the hose material and base size were changed.

Vacuum pump A conventional vacuum pump can be used by installing a vacuum pump adapter.

Gas leakage detector Special gas leakage detector for HFC refrigerant R410A.

2.3. Accessories

Name and shape Q’ty Application Name and shape Q’ty Application

Installation Manual

This manual Washer

For suspending the

Branch box from

ceiling

Coupler heat insulation

(large)

For indoor and outdoor

side pipe joint (gas pipe)

Tapping screw

(Ø 4×10)

For installing the

Hanger

Coupler heat insulation

(small)

For indoor and outdoor

side pipe joint (liquid pipe)

Tapping screw

(Ø 4×25)

For installing the

Branch box on the wall

Insulation (long)

For use on the section

where the insulation

ﬁ ts onto this equipment

(indoor unit side)

Binder

For remote controller

cable binding

Insulation (short)

For use on the section

where the insulation

ﬁ ts onto this equipment

(outdoor unit side)

Seal

To prevent small

animals from entering

inside

Insulation

To be used with this

equipment’s (indoor unit

side) piping

Adapter

12.7 (1/2)

➝

9.52 (3/8)

[mm(in.)]

For indoor unit

connection