Strebel SC40, User Manual

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Coopra Advanced Heating Technologies b.v. Installation and user manual EN_FMT
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5.1.3. Central heating temperature regulation with
modulating thermostat (EBV or Opentherm) with or without
outside temperature sensor
Set point
The set point indicates whether there is a heat demand.
- Without an outside temperature sensor, the desired central
heating flow temperature (set point) is calculated by the
modulating room thermostat.
- With an outside temperature sensor, the measured outside
temperature is sent to the modulating room thermostat, which
uses it to calculate the desired central heating flow
temperature (set point).
Burner is on
x
when the room thermostat is closed (heat demand)
x
and when the actual flow temperature is 5°C below the
set point (desired central heating flow temperature)
x
and after 3 minutes anti-recycling time, if applicable
Burner is off
x
when the room thermostat is open (end of heat
demand)
x
when the actual flow temperature is 3°C above the set
point (blocking)
x
or when the actual flow temperature is 3°C above the
maximum permissible central heating temperature.
During the set central heating post-running time, the pump will
continue to run over the central heating circuit in low load.
5.2. HWS temperature regulations
5.2.2. Boiler with external HWS cylinder
The regulation is made on the basis of flow temperature with a
normal cylinder thermostat function, on off.
5.2.2.1. HWS cylinder with external sensor without
modulating space unit
The unit switches the heating of the storage HWS cylinder off
when the return sensor has reached the desired final
temperature of the HWS cylinder.
There is a burner demand when the flow temperature is lower
than 85°C and the return temperature is lower than the desired
HWS cylinder temperature.
With HWS cylinder heat demand, the pump state is high.
5.2.2.2. HWS cylinder with external sensor with modulating
space unit
The modulating thermostat will generate a desired HWS
temperature value.
The unit switches the heating of the cylinder off when the return
sensor has reached the desired final temperature of the HWS
cylinder.
There is burner demand when the flow temperature is lower
than 85°C and the return temperature is lower than the desired
HWS cylinder temperature.
With HWS cylinder heat demand, the pump state is high.
5.2.3. HWS cylinder with thermostat without modulating
space unit
There is HWS cylinder heat demand when the HWS cylinder
thermostat is closed.
The unit switches the heating of the HWS cylinder off when the
return sensor has reached the desired final temperature of the
HWS cylinder
There is burner demand when the flow temperature is lower
than 85°C and the return temperature is lower than the desired
HWS cylinder temperature.
With HWS cylinder heat demand, the pump state is high.
5.2.4. HWS cylinder with thermostat with modulating space
unit
The modulating thermostat will generate a desired hot water
temperature value.
There is heat demand when the HWS cylinder thermostat is
closed.
The unit switches the heating of the HWS cylinder off when the
return sensor has reached the desired final temperature of the
HWS cylinder.
There is burner demand when the flow temperature is lower
than 85°C and the return temperature is lower than the desired
HWS cylinder temperature.
With HWS cylinder heat demand, the pump state is high.