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2.3.2. Connection of the domestic hot water timer and circulation pump (servo-motor)
For the connection of the domestic hot water thermostat or timer should be followed the same
instructions like for the room thermostat. The switching on contact of the domestic hot water
thermostat is to be connected to terminals X6. In case the domestic hot water preparation is
not provided by the boiler, the terminals have to remain unconnected.
The circulation pump (or the servo-motor) of the domestic hot water is connected by
independent switching contact at terminals X14 (Figure 6). It is protected by fuse F5 (5A). A
terminal X14 provides the neutral and a safety earth. To terminal X13 is to be provided
external phase L1. It can be used the internal phase by means of placing an electrical bridge
between L and L1 from the same terminal.
Some examples of hydraulic and electrical connection schemes for a domestic hot water
circuit are shown at Figure 7:
a)
With four-way mixed valve and third circulation pump for domestic hot water circuit
(Figure 7a)
b)
With four-way mixed valve and three-way magnet valve in the domestic hot water
circuit (Figure 7b)
a)
b)
Figure 7
Consider the meaning of the above mentioned abbreviations at Figure 7 as follows:
B – boiler
WH – water heater
Switching on the domestic hot water timer, when the water tank temperature is lower
than Tbset will cause the boiler start no matter of the boiler operation mode. It means that it
can be happened even during the summer regime when the mixed valve is closed and the
circulation pump P2 is stopped. The boiler protection against overheating is still active in the
regime of a domestic hot water preparation, as the Controller stops the boiler operation,
without stopping the circulation pump in the domestic hot water circuit, which actually stops
when the water tank temperature reaches 90
0
C. The protection against overcooling of the
return boiler water is active during the domestic hot water preparation, stopping the pump in
the domestic hot water circuit without boiler stopping.
P2
14 13 12
L N
P1
WH
B
Х2
P3
PE
P2
14 13 12
L N РЕ
P1
B
Х2
WH
