Connecting The Outside Temperature Sensor; Connect Frost Protection - REMEHA Calenta 25s Installation And Service Manual

Calenta 25s - 28c - 35s - 40c
On/off
OT BL RL Tout Tdhw
90
70
50
30
10
-20 -10 0
On/off
OT BL RL
Tk Tv
040412 - 7600585-01
Ba
T001591-B
F
10 20
R000038-A
Tout Tdhw
T000778-C
4.9.5. Connecting the outside temperature
sensor
Outside sensor
Ba
An outside sensor can be connected to the Tout terminals of the
connector. Where there is an on/off thermostat controller, the boiler
will control the temperature with the set point of the internal heating
curve.
A OpenTherm controller can also use this outside sensor.
The heating curve required must then be set on the
controller.
n Heating curve setting
If an outside temperature sensor is connected, it is possible to adapt
the heating curve. The setting can be modified using parameters
p1, p"5, p"6 and p"7.
4.9.6.

Connect frost protection

n Frost protection in combination with on/off thermostat
If an on/off thermostat is used, it is advisable to protect any rooms
where there is risk of frost by using a frost thermostat. The radiator
valve in a room where there is a risk of frost must, however, be open.
4 In rooms where there is a risk of frost, a frost thermostat (Tv)
should preferably be installed.
4 Connect the frost thermostat in parallel with an on/off room
thermostat (Tk) to the On/off-OT terminals of the connector.
When using a OpenTherm thermostat, a frost thermostat
cannot be connected in parallel to the On/off-OT
terminals. Implement frost protection for the central heating
system in combination with an external sensor.
4. Installation
43