Plum ZAB-14, Service And Assembly Manual

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Brief description: The DHW pump (12) can start its operation only after the boiler exceeds the CH
activation temp. (by default 40 
O
C) Mixer pump (10) and servo (8) start operation regardless of
the value of the parameter CH activation temp. The mixer servo (8) founds such valve opening
stage at which the temperature at sensor (9) will be equal to the preset mixer temperature 1.
When the temperature on sensor (5) drops below the value Min. return temp. , the servo (8),
closes to the value close valve for return protect. After the temperature on sensor (5)increased
buy the value Return temp. hyst. , the servo switches into stabilization of preset mixer
temperature 1 . The setting Mixer 1 operation = CH on guarantees that even in the case of the
boiler (1) overheating, the mixer (8) will open maximally, and the mixer pump (10) will not be
disabled at the moment of exceeding the
Max.mixer temp. Return protection is available only for
mixer 1 circuit.
9.2 Scheme 2
Fig. 23
Diagram with thermostatic three-way valve which protects the temperature of return
water
3
, where:1 – boiler with feeder, 2 – ZAB-14 regulator, 3 – regulator control panel, 4 –boiler
temperature sensor, 5 – return temperature sensor, 6 – central heating cycle pump, 7 – thermostatic three-
way valve, 8 –throttle (poppet) valve, 9 – room thermostate, 10 – temperature sensor-weather, 11 –
domestic hot water tank, 12 – domestic hot water pump, 13 – domestic hot water temperature sensor.
SUGGESTED SETTINGS
:
Parameter Setting MENU
Return protection off service settings -> boiler settings
Mixer operation 1 off service settings -> mixer 1 settings
Brief description: The CH pump (6), and the DHW pump (12) can start their operation only after
the boiler exceeds the CH activation temp. (by default 40  C). The thermostatic valve (7) closes at
3
The presented hydraulic diagram does not replace the central heating system design and is
provided solely for the purposes of demonstration
!