Hitachi RWM-(H)FSN3E Technical Catalogue page 151

11 Installation
configurations

Installation example 5
Alternating Space heating + Boiler combination. Space heating application with optional Room Thermostat and alternating
Boiler combination.
Option 1: Hydraulic separator
R410a
N O T E
When the unit is configured with a boiler in parallel, a hydraulic separator or buffer tank has to be used to ensu-
re proper hydraulic balancing. Additional Water pump (WP3) and water sensor (Two3) it is needed for this.
Option 2: With 3-way valve
R410a
N O T E
For configurations with alternating boiler.
151
TCGB0070 rev.3 - 04/2012
High Temperature Low Temperature
(60ºC) (35ºC)
Boiler
Two3
J
H WP3
H20
Boiler
nal
Sig
Boiler
Two3 J
H
WP3
G
3wv
H20
Boiler
Signal
Item Description
1 Outdoor unit
2 Indoor unit
3 Heat exchanger
4 Electrical heater
5 Water pump (primary)
6 Valves (factory supplied)
11 Boiler (field supplied)
Hydraulic separator (acces-
12
sory)
13 Water pump (field supplied)
Hydraulic separator sensor
14
(accessory)
G Boiler output signal
H Water pump 3 signal (WP3)
Hydraulic sensor signal (Two3)
J
(accessory)
Item Description
1 Outdoor unit
2 Indoor unit
3 Heat exchanger
4 Electrical heater
5 Water pump (primary)
6 Valves (factory supplied)
11 Boiler (field supplied)
12 Hydraulic separator (accessory)
13 Water pump (field supplied)
Hydraulic separator sensor
14
(accessory)
3-way valve for boiler (field
15
supplied)
G Boiler output signal
H Water pump 3 signal (WP3)
Hydraulic sensor signal (Two3)
J
(accessory)
11