Plum ecoMAX920P2-I, Operation And Installation Manual

Page: 41 / 48

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living room.
T1
…T3 – the controller receives ON/OFF signal from the universal
room thermostat. Caution: after using the universal room thermostat
connected to controller terminals, there is no further possibility of
correcting temperature of water in the circuit from the room
temperature! Therefore it is recommended to use the control panel
as a room thermostat.
Room thermostat function

Reduction,

Correction,

The
correction
Correction
Reduction
– exceeding a room preset temperature causes a
decrease of preset temperature of water in the heating circuit by
Water temperature reduction from thermostat value.
Correction
– exceeding a room preset temperature causes a
temperature correction of water in the heating circuit. Correction is
proportional to a
temperature correction value and to a difference
between preset and measured room temperature.
Thermostat + correction
– exceeding a room preset temperature
causes a temperature correction of water in the heating circuit and
decrease of preset temperature of water in the heating circuit by
Water temperature reduction from thermostat value. The correction
is proportional to the parameter value room temperature correction
and proportional to the temperature difference between the set
temperature and the measured room temperature.

Room temperature
correction
0 … 100
20
The higher parameter value the higher correction of set temperature
in the heat circuit.
Set water temperature in the heat circuit will be corrected by delT
value:
delT = (TsetR
– TmR)*
temperature correction / 10,
where:
TsetR - set room temperature,
TmR - measured room temperature.
Set temperature of water in the heat circuit will not be corrected in
temperature correction =0 . Parameter disappears when Room
thermostat function = thermostat.
Decreasing water
temperature from
thermostat
0 … 50 8°C
This parameter can be used only when Room thermostat function =
thermostat. Exceeding a set room temperature causes decreasing
set temperature in the heat circuit by
“Decreasing water
temperature from thermostat”
value.
Set temperature of water inside the heat circuit is not changed if
Decreasing water temperature from thermostat = 0. Parameter
disappears when Room thermostat function = correction.
Pump lock from room
thermostat
No, Yes No
No
– heating circuit pump is not locked when the preset room
temperature is exceeded,
Yes
– heating circuit pump not locked when the preset room
temperature is exceeded
When the pump is locked by room t
hermostat, temperature “drop”
can be prevented. It can be achieved with the use of parameters:
Heating circuit lock time and heating circuit operation time located in
menu → service settings → system → room thermostat.
Minimum temperature
15 … 65 20°C
Minimum preset temperature of water in the heating circuit.
Maximum temperature
20 … 90
70
°C
Maximum preset temperature in the heating circuit. In Maximum
temperature >
55°C and
Support = ON (floor), the controller will take
55°C as a maximum value in order to avoid the risk of scalding.
Valve full opening time
60 … 255
140s
Read valve full opening time from a servo housing, e.g. It is usually
located on a servo nameplate and within a range of 90
– 180s
Operation in SUMMER No, Yes No
Parameter enables to enable the heating circuit outside a heating
season despite of
SUMMER mode = ON setting. For instance, floor
heating in a bathroom can be enabled in spring or autumn if there is
no need to heat the whole building but the user wants to heat the
bathroom.
Mixer dead zone
0,0 … 4,0 2°C
Parameter setting defining a temperature dead zone for the
adjustable circuit. The controller controls a servo in such way that
the temperature measured by a circuit sensor is equal to a preset
value. Nevertheless in order to avoid frequent servo movements
which can shorten its life, adjustment is carried out only when the
measured water temperature is lower or higher than the mixer dead
zone.