Boiler start at power
The boiler starts when the power demand to this boiler
(e.g. from storage tank management) exceeds this value.
Minimum boiler temperature setpoint
Minimum setting value of the boiler temperature setpoint.
Bypass mix. valve Kp
Defines the gain factor of the PI controller. The higher the
value is set, the more sensitive the controller reacts.
Bypass mix. valve Tn
Reset time of the PI controller in seconds.
Bypass mix. valve Ty
Mixer runtime in seconds. The time depends on the mixing
valve type (make) and specifies how long it takes the
mixing valve to move from the open to the closed position.
Maintain boiler temperature?
When enabled, the return temperature is adjusted so that
the boiler reaches its set temperature setpoint.
Modulate return setpoint according to power?
When enabled, the power demand of the storage tank is
used to adjust the return temperature.
Minimum difference between return feed and boiler
temperature setpoint at min. power
Minimum temperature difference in °C between boiler
temperature and return temperature at minimum output, so
that the return temperature does not exceed the boiler
temperature setpoint and heat consumption is guaranteed.
Otherwise the boiler would shut down, even if there is
power consumption.
Minimum difference between return feed and boiler
temperature setpoint at max. power
Minimum temperature difference in °C between boiler
temperature and return temperature at maximum output,
so that the return temperature does not exceed the boiler
temperature setpoint and heat consumption is guaranteed.
Otherwise the boiler would shut down, even if there is
power consumption.
Return feed temperature setpoint delay
The return setpoint is raised cyclically after this time to
reach the desired boiler temperature. This time should be
set such that the return is only increased again when the
effect of the previous increase can be seen. In other
words, so that the 3-point return mixer has had enough
time to adjust to the new setpoint and the new return
temperature has also had an effect on the boiler
Return feed temperature setpoint delay
temperature. In conjunction with the “Return feed
temperature setpoint boost” (= value by which the return
setpoint should be increased) you can change between
short delays for small increases, and longer delays for
larger increases. If the actual boiler temperature has
exceeded the boiler temperature setpoint, this parameter
will not be used for a delay to the return setpoint.
Return feed temperature setpoint boost
This is the percentage value by which the return
temperature setpoint should be increased. The current
boiler temperature setpoint is compared to the actual boiler
temperature. The increase proportion (percentage value)
is then taken from this difference and added to the current
return setpoint value. The parameter applies exclusively
for increases to the return temperature setpoint. If the
actual boiler temperature has exceeded the boiler
temperature setpoint, this parameter is not used for a
reduction to the return setpoint.
Difference to boiler temperature setpoint until return feeed
boost is active
Difference to boiler temperature setpoint until return feed
boost remains active.
Warning if ACTUAL return < return SETPOINT minus
A warning is issued if the return temperature is lower by
the set value than the set return temperature setpoint.
Low return temperature warning delay
If the return temperature is too low, the boiler is switched
off once the set delay time has elapsed.
Boiler pump maximum speed
The speed control of the distributor pump is limited to this
value (e.g. in case of a systemic adjustment of the
maximum pump speed).
Boiler pump minimum speed
To adjust the minimum speed to the pump type (set mode
of pump in accordance with pump manufacturer).
Boiler pump manual operation
Defines the speed of the boiler pump in case of manual
activation in the “Manual operation” menu.
Boiler frost protection temperature
As soon as one of the sensors for the boiler, return or
slide-on duct temperature falls below the set value, a
warning is issued and the boiler pump and slide-on duct
pump are activated.
Menus and parameters
5
Boiler
Service manual SPS 4000 | B0960622_en
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