Piping Connection For Rasc Unit - Hitachi RASC-HNPE CENTRIFUGAL VRF Series Installation And Operation Manual

Refrigerant piping & refrigerant charge

11.2 PIPING CONNECTION FOR RASC UNIT

The stop valves are located on the right side of unit cover.
Before connecting refrigerant piping, the stop valve protection
cover shall be removed.
1 Mount the piping cover in order to avoid water entering into
the unit. Seal the holes where pipes and wires are inserted,
2
directly, it is recommended use a tube bender.
3 Check to ensure that the stop valves are closed completely
before connecting pipes.
4
pipe before tightening.
The required tightening torque is as follows:
Pipe Size
Ø 6.35 mm (1/4")
Ø 9.52 mm (3/8")
Ø 12.70 mm (1/2")
Ø 15.88 mm (5/8")
Ø 19.05 mm (3/4")
5 After connecting the refrigerant piping, seal the open space
between knockout hole and refrigerant pipes by using
insulation material.
Unit
Side
20 PMML0319A rev.1 - 06/2015
Gas valve
Liquid
valve
Tightening Torque (Nm)
20
40
60
80
100
Nº Description
Insulation Material
Insulation Material
Field Supplied
Insulation Material
6 Operation of stop valve should be performed according to
Closed before shipment
RASC unit stop valve
Spindle Type
Liquid
Spindle valve
Flare nut
Cap
Check joint for service port
Tightening Torque (N.m)
Liquid valve 7-9
10HP: 60
Gas valve -
8/10HP: 100
Spindle Type
Nº Description
Cap
Allen wrench Hex 4 mm
Refrigerant Piping Field Supplied
Flare nut
Refrigerant
To RASC Unit
Pressure
Seat Surface Fully closed position
Only the charging those can be
Check Joint
connected
Charge port cap
O-Ring Rubber
Open – Counterclockwise
Spindle valve
Close – Clockwise
Shaft
Pin
Stopper
This valve is opened or closed with
(a) Closed
rotating 90 degrees at the ball valve part.
Rotate the shaft until the pin touches the
stopper. Do not apply the extra force.
Use a slotted screwdriver to control the
(b) Opened
shaft. Do not leave the ball valve partly
open
Ball Type
Gas
(a)
40
33-42
80
20-25
Ball Type
(a)
Remarks
14-18
(b)