Potterton eurocondense four 125 kw, Installation, Operation And Maintanance Manual, Page: 109 / 148

setpoint plus the value set here. The setting -5°C results in the intermedi­
ate circuit pump being switched on as soon as the boiler temperature is
5°C below the boiler setpoint .
Excess interm circ temp del (5151)
Control of the burner output on the charging temperature is activated if the
time set here has elapsed since switching on the intermediate circuit
pump.
9.2.17 Configuration
Temps / mode CH1 (5710),Temps / mode CH2 (5715)
andTemps / mode CH3 (5721)
The heating circuits can be switched on or off using this setting. Heating
circuit parameters are hidden in the deactivated state.
Note
This adjustment only affects the heating circuits directly and has
no influence on operation.
Hot water sensor (5730)
None: No DHW sensor available.
Hot water sensor B3: There is a DHW storage tank sensor available.
The controller calculates the switching points with the corresponding
switching difference from the DHW setpoint and the measured DHW
storage tank temperature.
Thermostat: Control of domestic hot water temperature as a function of
the switching status of a thermostat connected to DHW sensor B3.
Note
No reduced mode is possible when a DHW thermostat is used.
This means if reduced mode is active, the DHW preparation is
blocked with the thermostat.
Caution
No frost protection for DHW! The domestic water frost protection
cannot be guaranteed.
Hot water ctrl elem Q3 (5731)
No charging request: DHW charging disabled via Q3.
Charging pump: DHW charging via the connection of a charging pump
to Q3/Y3.
Diverting valve: DHW charging via the connection of a diverting valve to
Q3/Y3.
Basic pos HW div valve (5734)
The base position of the diverting valve is the position in which the divert­
ing valve (DV) is in if no request is active.
Last request: The diverting valve (DV) remains after the last request has
ended in this last position.
Central heating: The diverting valve (DV) goes into the heating circuit
position after the last request has ended.
Hot water: The diverting valve (DV) goes into the DHW position after the
last request has ended.
Hot water separate circuit (5736)
The DHW separate circuit can only be used in a boiler cascade.
Off: The DHW separate circuit function is disabled. Each available boiler
can feed the DHW storage tank.
On: The DHW separate circuit function is enabled. The DHW charging is
only done from the boiler defined for this.
Note
The DHW actuator Q3 must be set under prog. no. 5731 to "Di­
verting valve" for a DHW separate circuit to become effective.
9 Settings
7636047 - 02 - 24082015 109