Hitachi Service Training

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Piping connection for Heat pump (2 pipe system) and Heat Recovery (3 pipe system).
(2 pipe system)
(2 pipe system)
General Installation (pipe connection)
6.5 Piping Connection for Heat Pump System
Perform the piping connection work for each outdoor unit.
NOTE:
Ensure that the refrigerant pipe should be connected to the same refrigerant cycle unit.
● Prepare the refrigerant pipe in the field for the piping work.
Refer to Fig. 6.1 for the position of piping connection.
< FSXN1 > (mm)
Model A B C D E F
RAS-8FSXN1 φ19.05 φ9.52
150 150 340 205 RAS-10FSXN1 φ 22.2 φ9.52
RAS-12FSXN1 φ 25.4 φ12.7
RAS-14FSXN1 φ 25.4 φ12.7
170 170 325 200
RAS-16FSXN1 φ28.58 φ12.7
< FSXNH > (mm)
Model A B C D E F
RAS-5FSXNH φ15.88 φ9.52
150 150
340 205
RAS-6FSXNH φ19.05 φ9.52
RAS-8FSXNH φ19.05 φ9.52
170 170 RAS-10FSXNH φ 22.2 φ9.52
RAS-12FSXNH φ 25.4 φ12.7
Square Holes at
Front and Back Sides
B Refrigerant Liquid Piping Connection
A Refrigerant Gas Piping Connection
(High/Low Pressure)
Refrigerant Piping and
Wiring Connection Holes
(Knockout Holes)
D Refrigerant Liquid Piping Connection
C Refrigerant Gas Piping Connection
(High/Low Pressure)
E Refrigerant Liquid Piping ConnectionF Refrigerant Gas Piping Connection
(High/Low Pressure)
This piping connection is NOT used
at Heat Pump System (2 Pipes).
88
145
205
190 65
Power Source Cable Outlet
( 65 Knockout Hole)
6.6 Piping Connection for Heat Recovery System
Perform the piping connection work for each outdoor unit.
NOTE:
Ensure that the refrigerant pipe should be connected to the same refrigerant cycle unit.
● Prepare the refrigerant pipe in the field for the piping work.
Refer to Fig. 6.3 for the position of piping connection.
< FSXN1 > (mm)
Model A B C D E F G
88
145
205
Square Holes at
Front and Back ides
C Refrigerant Liquid Piping Connection
A Refrigerant Gas Piping Connection
(Low Pressure)
B Refrigerant Gas Piping Connection
(High/Low Pressure)
Refrigerant Piping and
Wiring Connection Holes
(Knockout Holes)
E Refrigerant Liquid Piping Connection
D Refrigerant Gas Piping Connection
(Low Pressure)
D Refrigerant Gas Piping Connection
(High/Low Pressure)
F Refrigerant Liquid Piping ConnectionG Refrigerant Gas Piping Connection
(Low Pressure)
G Refrigerant Gas Piping Connection
(High/Low Pressure)
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