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• Hydrobox • Heating only hydrobox for VRV
®
• HXHD-A
• VRV
®
Systems • Hydrobox
8
5
Piping diagrams
5 - 1 Piping Diagrams
HXHD-A
3TW59915-1B
Refrigerant side
Check
valve
Muffl er
Accumulator
Plate heat
exchanger
R410a/R134a
Heating
heat
exchanger
R410a
Filter
Filter
Filter
Filter
Drain port
Service port
5/16°
Service port
5/16°
Outdoor Unit
Field piping ø12.7 C 1220T
-0
Field piping ø9.52 C 1220T
-0
Shut off
valve
Shut off
valve
Safety
valve
3-way
valve
Field installation
(delivered with option
domestic hot water tank)
Standard
Expansion
vessel
Pressure
gauge
Air purge
Blow off
G 1° (female)
Water outlet
G 1° (female)
Water inlet
Option domestic hot
water tank
R7T Liquid thermistor R134a
R6T Discharge thermistor
R5T Leaving water thermistor
R4T Returning water thermistor
R3T Liquid thermistor R410a
S1PH High pressure switch
B1PL Low pressure sensor
B1PH High pressure sensor
K2E Electronic expansion valve
K1E Electronic expansion valve
K1S 3 way valve
O2L Thermistor protector waterpiping
M1C Compressor
M1P DC invertor pump
Check valve
Flare conn.
Screw conn.
Flange conn.
Pinched pipe
Spinned pipe