Refrigerant Piping & Refrigerant Charge; Piping Work Connection Considerations - Hitachi RASC-HNPE CENTRIFUGAL VRF Series Installation And Operation Manual

Refrigerant piping & refrigerant charge
11 REFRIGERANT PIPING & REFRIGERANT CHARGE

11.1 PIPING WORK CONNECTION CONSIDERATIONS

11.1.1 Piping Materials
1 Prepare locally-supplied copper pipes.
2 Select the piping size with the correct thickness and correct
3 Select clean copper pipes. Make sure there is no dust and
moisture inside. Blow the inside of the pipes with oxygen
free nitrogen to remove any dust and foreign materials
before connecting pipes.
4 After connecting the refrigerant piping, seal the open space
between Knockout hole and refrigerant pipes by using
insulation material as shown bellow:
Insulation material
Unit side
Insulation
material
N O T E
•
•
C A U T I O N
•
•
•
•
•
•
19 PMML0319A rev.1 - 06/2015
Field Supplied refrigerant pipe
Insulation material
11.1.2 Suspension of Refrigerant Piping
Suspend the refrigerant piping at certain points and prevent the
refrigerant piping from touching the weak part of the building
such as wall, ceiling, etc...
(If touched, abnormal sound may occur due to the vibration of
the piping. Pay special attention in case of short piping length).
1~15m
Indor unit
(The refrigerant piping may expand and contract).
Some examples for suspension method are shown below.
For Suspending
Heavies along the wall
Fire-Proof Section
Treatment
For piping For instant
installation work