Hitachi RAS-10FSXN1E Bedienungsanleitung Seite 31

PIPING WORK AND REFRIGERANT CHARGE
For heat recovery systems (3 pipes)
RAS-8FSXN1E
RAS-(5-8)FSXNHE
B
A
C
D
G
E
F
G
K
RAS-14FSXN1E
A
B
C
D
H
E
L
G
K
!
D A N G E R
• Check that the gas and liquid stop valves are fully closed.
• Check that there is no gas inside the pipe before removing the
stop pipe. Otherwise, the pipe may explode when heated with
the blow torch.
Special care should be taken to ensure that the flame from the
blow torch does not fall on the body of the stop valve, on the
compressor and cover or on the insulation bushings; insert a
metal plate in front of the oil return pipe: see on section
valve".
Connect the indoor units to the outdoor units using copper pipes
specifically for use with refrigerant. When laying the pipes make
sure that they do not directly rest on or touch walls or other parts
of the building (when the refrigerant is flowing through the pipes,
this could cause strange noises).
Specific torques for the flared connections: see on section
"Details of stop valves".
While welding, apply a flow of nitrogen gas inside the pipe.
Fully insulate the refrigerant pipes.
21 PMML0392B rev.1 - 07/2016
RAS-10FSXN1E
RAS-10FSXNHE
B
A
C
D
H
E
L
G
K
RAS-16FSXN1E
A
B
C
D
E
G
F K
"Stop
RAS-12FSXN1E
A Stop valve (Low pressure gas).
B Stop valve (High/low pressure gas)
A
B
C Stop valve (Liquid)
C
D
D Flaring
J
H
E
Liquid pipe (field-supplied)
E
F
F Accessory pipe (B)
I
G
G 90º Elbow B (field-supplied)
RAS-12FSXNHE
H 90º Elbow A (field-supplied)
B
A
I High/low pressure gas pipe (field-supplied)
C
D
J Accessory pipe (C)
J
G
K Accessory pipe (A)
E
F
L Low pressure gas pipe (Field supplied)
H
I
!
C A U T I O N
Fit the pipe protection provided with the outdoor unit on completion of the
installation work. Otherwise, the unit may be damaged by the entrance of
snow, water or rodents
?
N O T E
For heat pump systems (2 pipes)
Refer to the Accessories factory-supplied
pipes (B) and (C).
Ensure that the closing pipes of the high/low and low pressure gas stop
valves (2 parts) are removed firstly.
For heat recovery systems (3 pipes)
Refer to the Accessories factory-supplied
pipes (A), (B) and (C).
Ensure that the closing pipes of the high/low and low pressure gas stop
valves (1 parts) are removed firstly.
for the details of the accessory
for the details of the accessory