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13. Manometer
The manometer allows readout of the water pressure in the
water circuit.
14. Flow switch
The flow switch checks the flow in the water circuit and protects
the heat exchanger against freezing and the pump against
damage.
15. Pump
The pump circulates the water in the water circuit.
16. Backup heater vessel
The backup heater heats the water in the backup heater vessel.
17. Backup heater thermal protector
The backup heater is equipped with a thermal protector. The
thermal protector is activated when the temperature becomes
too high.
18. Backup heater thermal fuse
The backup heater is equipped with a thermal fuse. The thermal
fuse is blown when the temperature becomes too high (higher
than the backup heater thermal protector temperature).
19. Pressure relief valve
The pressure relief valve prevents excessive water pressure in
the water circuit by opening at 3 bar and discharging some
water.
Functional diagram of hydraulic compartment (door 3)
1
2
3 4
5
R11T
t >
H
O
2
R14T
R13T
t >
8
9
1
Expansion vessel
2
Manometer
3
Air purge valve
4
Pressure relief valve
5
Backup heater vessel
with backup heater
6
Pump
R11T
R12T
7
Shut-off valve water
R13T
outlet
R14T
Installation manual
9
All manuals and user guides at all-guides.com
6
7
R12T
t >
t >
10
11
12
8
Heat exchanger
9
Flow switch
10
Drain/fill valve
11
Filter
12
Shut-off valve water inlet with
drain valve
Temperature sensors
Switch box main components (door 2)
A
B
D
A
8
S1T
9
9
8
B
15
3
K5M
1
K1M
1
5
F1B
F2B
4
2
D
8
6
7
X10M
18
19
22
1.
Backup heater contactors K1M and K5M
2.
Main PCB
The main PCB (Printed Circuit Board) controls the functioning of
the unit.
3.
Booster heater contactor K3M
4.
Booster heater circuit breaker F2B
The circuit breaker protects the booster heater in the
water tank against overload or short circuit.
hot
5.
Backup heater circuit breaker F1B
The circuit breaker protects the backup heater electrical circuit
against overload or short circuit.
6.
Terminal blocks
The terminal blocks allow easy connection of field wiring.
7.
Terminal block for backup heater capacity limitation.
8.
Cable tie mountings
The cable tie mountings allow to fix the field wiring with cable
ties to the switch box to ensure strain relief.
9.
Terminal blocks X3M, X4M
10. PCB fuse FU1
11. DIP switch SS2
The DIP switch SS2 provides 4 toggle switches to configure
certain installation parameters. See "DIP switch settings
overview" on page 19.
12. X13A socket
The X13A socket receives the K3M connector
C
C
E5H
FU2
14
FU1
10
16
X13A
TR1
12
SS2
11
on
SS2
off
on
SS1
17
A4P
8
A11P
X9A
13
8
23
6
X2M
21
20
domestic
R(D/B)LQ011~016AA6V3+W1
Unit for air to water heat pump system
4PW53149-1
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