Hitachi RAC-112SQB, Installation Manual

Page: 9 / 20

9
(2) Precautions for installing refrigerant pipes (example)
Make sure the pipe is free of water and dust inside. Cut the pipe with a copper pipe cutter. Remove dust and impurities inside
the pipe with nitrogen or compression air before installation. (Do not use a saw or whetstone that may cause powder.)
□
Prepare suitable refrigerant pipes onsite.
＜
Precautions for releasing pressure from the pipe union
＞
Release pressure from the pipe union (
Ⓑ
in the right diagram) on the fluid
interceptor valve on the pipe union (
Ⓐ
in the right diagram) of the gas
interceptor valve. Follow the instructions below.
Operation Air Conditioner
Pipe union
Ⓐ
on the gas
interceptor valve.
Low pressure
Pipe union
Ⓑ
on the liquid
interceptor valve.
Filling refrigerant after evacuation or repair.
Note: After removing the filling hose, prevent refrigerant and refrigeration oil
from contaminating the electrical panel.
Penetrating walls
Protect pipe ends when penetrating walls.
Protect pipe ends with a cover or plastic bag.
Do not put pipes
on the floor
unprotected.
Protect pipe ends with a cover or plastic bag.
Protect pipe
ends with a
cover or
plastic bag.
Rubber
band
Rainwater
enters.