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Sequence of functions
Faulty outside sensor
Building Technologies
HVAC Products
The sequence of frost protection for the plant is as follows:
TO
ON
ON
1 K
-6
-5
-4
-3
Outside temperature
<–5 °C (TO
)
ON
–4...+2 °C
>2 °C (TO
)
OFF
Adjustable are the following temperatures:
• TO
: Outside temperature below which frost protection for the plant switches the
ON
pump permanently on (frost protection for the plant permanently on)
• TO
: Outside temperature below which frost protection for the plant switches the
OFF
pump periodically on (frost protection for the plant on cycling).
In the event the outside sensor becomes faulty, frost protection for the plant continues
to operate with a constant outside temperature backup value of 0 °C.
5.4
Pump overrun and mixing valve overrun
For all pumps and all mixing valves, overtemperature protection can be activated. It
always becomes active after the burner has shut down. To ensure that the heat con-
sumers still draw heat during a minimum period of time, an overrun time is enforced on
the heat consumers that were not switched off more than 1 minute ago. During the
overrun time, the pumps and mixing valves continue to operate; the pumps continue to
run and the mixing valves maintain the former setpoint.
The duration of the overrun time is dependent upon the type of heat source and can
therefore be set separately for every boiler.
Main menu > Commissioning > Settings > ... or
Main menu > Settings > Boiler ... > Limitations
Operating line
Consumer overrun time
Every consumer has a minimum overrun time of 60 seconds.
5.5
Pump kick and valve kick
Main menu > Commissioning > Settings > ... or
Main menu > Settings > Protective functions
Operating line
Kick day
Kick time
Pump/valve kick
Pump kick and valve kick are protective functions that are carried out periodically. They
prevent pumps and/or valves from seizing after longer off periods (e.g. in the summer).
For the kick function to be carried out, the pump or actuator must not have been acti-
vated for at least 1 week.
Boiler sequence controller RMK770
5 General functions, fundamentals
ON/OFF
-2
-1
0
1
Pump
Permanently on
On for 10 minutes every 6 hours
Permanently off
Range
0...60 min
Range
--- / Monday...Sunday
00:00...23:59
--- / Pump + Valve /
Pump / Valve
TO
OFF
OFF
3
2
4
TO
Diagram
ON
ON/OFF
OFF
Factory setting
6 min
Factory setting
Monday
10:00
Pump + valve
CE1P3132en
23.04.2009
63/232
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