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7. Electrical installation
Installer reference guide / Mono tank integrated type
113
To connect the backup boiler (B4/B5)
1
Before connecting the backup boiler (output) signal wiring, the tank integrated hydro unit should be turned off.
2
Make sure to connect the backup boiler signal (output) at the correct terminal of the terminal block (as shown in the
diagram).
3
The output from the terminal block is a switched live ((B4) L 220-240V~) and a permanent neutral (B5 - N).
– Do not connect supply power to the backup boiler directly but connect via a 230Vac rated relays.
– The heat pump does not work when the backup boiler operates, this includes no zone-control, no pump control and
no temperature control in the zone(s).
B2
B6
B10
B14
B18
B22
B4
B8
B12
B16
B20
B24 B26
B1
B5
B9
B13
B17
B21
B3
B7
B11
B15
B19
B23 B25
Backup boiler (N)
Backup Boiler(L)
L N
L N
When it set backup boiler
on the control kit (relay off)
When it order to backup
boiler operates (relay on)
Boiler
Boiler
CAUTION
• The heat pump does not work when the backup boiler operates, this includes no zone-control, no pump
control and no temperature control in the zone(s).
Description
No. of wires
Mini./Max. current
Thickness
Remark
Backup boiler
2+ground
10mA /50mA
>0.75mm2, H05RN-F or
HO7RH-F
Field supply
(220-240V~, Input)