Hitachi CH Series, Инструкция по установке и эксплуатации, Страница: 16 / 168

10
REFRIGERANT PIPING WORK
4.4.3. Adjusting of the Unit Level
„ How to put Nuts
In order to avoid an incorrect unit operation, check the level of the unit using a water level in a
transparent Vinyl tube containing water.
No Description
o Vinyl Tube
p
Level Scale
Tighten the bolts of the suspension nuts with the suspension brackets after adjustment is completed.
Special plastic paint must be applied to the bolts in order to prevent them from loosening.
5.
REFRIGERANT PIPING WORK
Õ
DANGER
:
Use refrigerant R410A in the refrigerant cycle. Do not charge oxygen, acetylene or other
flammable and poisonous gases into the refrigerant cycle when performing a leakage test or
an air-tight test. These types of gases are extremely dangerous and can cause an explosion. It
is recommended that compressed air, nitrogen or refrigerant be used for these types of tests.
5.1. PIPING MATERIALS
1. Prepare locally-supplied copper pipes.
2. Select clean copper pipes. Make sure there is no dust and moisture inside. Before connecting
pipes, blow the inside of the pipes with nitrogen or dry air, to remove any dust or foreign
materials.
3. Select the piping size from dimensional drawing
5.2. PIPING CONNECTION
1. Position of piping connection is shown in dimensional drawing.
2. Connect the accessories as shown in the Diagram bellow:
„
CH-(4.0/8.0)NE
No Description
o
Pipe Fixing Band
p
Liquid Pipe
q
Low Gas Pipe
To
Indoor
Unit
{
}
To
Outdoor
Unit
r
High Gas Pipe
s
Gas Pipe
t
Reducer
Field-Supplied Piping