Solar - Potterton EC three 125 Installation, Operation And Maintenance Manual

Programming
Release integral source seq
(3530)
Reset integral source seq
(3531)
Restart lock
(3532)
Switch-on delay
(3533)
Auto source seq ch'over
(3540)
Auto source seq exclusion
(3541)
Leading source
(3544)
Return setpoint min
(3560)
Temp differential min
(3590)
Temp diff on
(3810)
Temp diff off
(3811)
98
A value generated from temperature and time. The following boiler will be
switched on in case of exceeding the set limit. .
The following boiler will be switched off in case of exceeding the setpoint
The restart lock prevents switching back on of a switched off boiler. Only after the
set time period has elapsed is it again released. This prevents too frequent
switching on and off of the boiler and achieves a stable operating condition of the
system.
Too frequent forward and back switching (cycles) of the boiler are avoided by the
switch-on delay and therefore a stable operating state is ensured.
The sequence of lead boiler and following boiler is defined by the source se-
quence changeover and in this way, the utilisation of the boilers in a cascade is
influenced. After the set time has elapsed, the boiler sequence will be changed.
The boiler with next higher device address operates as lead boiler.
- None: After the set time has elapsed, the boiler sequence will be changed.
- First: the first boiler in the addressing works as the lead boiler; for all other boil-
ers, the boiler sequence is changed after the time set in prog.no. 3540 has
elapsed.
- Last: the last boiler in the addressing always remains as the last boiler; for all
other boilers, the boiler sequence is changed after the time set in prog.no. 3540
has elapsed.
The setting of the leading source is only used in combination with the fixed se-
quence of the source sequence (prog. no. 3540). The generator defined as the
leading generator is always put into operation first, and switched off last. The
other generators are switched on and off in the sequence of the device address.
If the return temperature drops below the return setpoint set here, the return
maintenance is active. The return maintenance enables influences on the con-
sumers or use of a return controller.
This function prevents too high cascade return temperatures and improves the
switch off behaviour of the cascade. If the temperature difference between the
flow and return sensor is smaller than the minimal temperature spread set here,
a source is switched off as early as possible independently of the set lead strat-
egy. If the temperature difference is again sufficient, the set lead strategy is again
switched to.

8.4.13 Solar

The switching-on and switching-off point of the collector pump is set with these
functions. Basis is the temperature difference between collector temperature and
storage temperature.
Condensing gas boiler Eurocondense three125-300 kW 7308536-02 06.13