Plum ecoMAX920P2-I, Operation And Installation Manual, Page: 16 / 48

16
View of main menu screen with turned OFF work mode
with active anti-freeze function.
When measured temperature drops below
7°C, all heating circuits become active.
Independently of this, heating circuits can be
activated by the external temperature sensor
readings.
Description of anti-freeze protection against
the external temperature sensor readings:
 Direct circuit (H1)
When the external temperature drops below
3°C, an anti-freeze delay time, e.g. 4h
(parameter located in service settings) must
expire. If after this time the external
temperature is still under 3°C, a direct
heating circuit pump will be activated for 30
minutes. After 30 minutes the pump will be
off. Heat source (boiler) is activated along
with the pump and it heats the water in
direct circuit up to a minimum value (service
parameter). Next activation of the pump will
take place after an anti-freeze delay time,
e.g. 4h, unless the external temperature
exceeds 3°C. In such case the pump will not
be activated.
 Adjustable circuits (H2, H3)
After the external temperature drops below
3°C, an anti-freeze delay time, e.g. 4h
(parameter located in service settings) must
expire. After this time the external
temperature is still under 3°C, an adjustable
heating circuit pump will be activated for 15
minutes.
After 15 minutes, water
temperature in the circuit will be checked. If
it is higher than 13°C, the pump will be
stopped. If it is lower than 13°C, the pump
will continue its operation and heating circuit
will be heated by a heat source (boiler) up to
a minimum value (service parameter). The
pump will be stopped unless the external
temperature exceeds 3°C.
Do not disconnect or leave the
controller in STAND-BY mode
without antifreeze functions active
within a freezing hazard period.
View of main menu screen with turned OFF work mode
with active anti-freeze function.
If heating circuits have to be off during this
period, activate “off” or “auto-eco” mode for
heating circuits and HUW tank instead of
turning the controller off.
Description of the anti-freeze function for
HUW tank:
After the HUW tank sensor temperature
drops below 5°C, HUW tank will be loaded up
to a minimum temperature value (service
parameter).
menu

Service settings

HUW circuit
settings

Minimum temperature
Do not disconnect the controller
within a freezing hazard period.
9.3 Room temperature stabilization
Stability of maintaining room temperature
depends on:
- selection of weather control settings,
- selection of room thermostat settings.
Selection of weather control settings
Room temperature maintained in heated
compartments depends on a temperature of
water in heating circuit. Water temperature
in heating circuit is set depending on a
temperature outside the building. The colder
is outside, the higher heating circuit
temperature. This dependence is expressed
in the controller in a form of a heating curve.
Heating curve can be changed and it reflects
Anti-freeze function deactivated!