Siemens Synco 200 Basic Documentation page 55

Not possible via
operating mode
Load-dependent by the
sequence controller
"On" according to
outside temperature
Switch-off delay
Pump kick
Siemens
Building Technologies
8.1.2 Switching on / off
The pumps cannot be switched via the operating mode (Comfort, Economy).
The sequence controller can switch the pump on according to load. Up to 2
connections can be wired from the sequence controllers, in which case maximum
selection applies.
You can enter the switch-on and switch-off points via the ON-Y and OFF-Y
settings. In normal use, we recommend switching the pump on at 5% load, and
switching it off again at 0% load.
To prevent freezing of water pipes, pumps can be operated permanently at low
outside temperatures.
In order to be able to activate this function, an outside temperature signal must be
available (refer to section.7.6, Outside temperature (OUTS)
You can deactivate this function by setting the ON-OUTS limit value to –50 °C.
The controller switches the circulating pump on if the outside temperature falls
below the set limit value. It switches the pump off again when the temperature has
risen by 2 K above the limit value.
This function is available with every operating mode, including Protection.
For the pumps, a switch-off delay DLY OFF can be set. The switch-off delay always
acts on the switch-off command for:
Pumps that are switched on according to load via the sequence
•
"On" depending on outside temperature
•
The switch-off delay does not act with the following switch-off commands:
Plant stop due to fault status messages (frost [cooling sequence], main
•
controlled variable not available)
Wiring test
•
To prevent the pumps from seizing during longer off periods (e.g. heating group in
the summer), a periodic pump kick can be activated per every pump block. When
pump kick is activated, the pumps are switched on for 30 seconds, independent of
all other functions (refer to section 8.1.5 "Priorities").
The pump kick is executed periodically every "n" hours by setting the kick period.
Kick period = 0: No pump kick.
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CE1P3101en
29.08.2008