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Building Technologies Boiler Sequence Controller RMK770 CE1P3132en
HVAC Products 5 General functions, fundamentals 23.04.2009
If other controllers are configured as slaves in the same holidays / special day zone, the
digital inputs act on all these controllers also.
5.2.6 Fault handling
Per holidays / special day zone, only 1 master can be set. If there is more than 1 mas-
ter in a zone, fault status message ”>1 hol/spec day program” is delivered.
The fault is identified by the holidays / special day master (A) if it receives a holidays /
special day signal from some other master (B) in its own zone. Then, master A displays
and delivers a fault status message, but no more holidays / special day messages, to
prevent the slaves from switching back and forth.
If the controller expects a holidays / special day signal from the bus and the signal is
not sent, fault status message ">1 hol/spec day program" is delivered.
The operating modes of the 7-day program are used, without giving consideration to the
holidays / special day entries.
Number Text Effect
5201 Hol/spec day
program failure
Nonurgent message; must not be acknowledged
5202 >1 hol/spec day
program
Nonurgent message; must be acknowledged
For evaluation of the priority in the holidays / special day program, only the first 2
entries are considered. If more than 2 overlapping entries are made, it may be that the
special day no longer has priority over the holidays.
5.3 Frost protection for the plant
Main menu > Commissioning > Settings > … or
Main menu > Settings > Protective functions
Operating line Range Factory setting
Frost prot for plant ON (cycling)
–5…10 °C 2 °C
Frost prot for plant ON (cont)
–50…2 °C –5 °C
To protect piping against freezing, frost protection for the plant can activate the relevant
pump depending on the current outside temperature.
This takes place independent of whether or not there is a heat request. Prerequisite is,
however, that frost protection for the plant is activated for the relevant pump:
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler sequence manager > Limitations
Main menu > Settings > Boiler … > Limitations
Main menu > Settings > Primary controller > Limitations
Operating line Range Factory setting
Frost protection for the plant Off / On Off
Main menu > Settings > Heating circuit > Limitations
Operating line Range Factory setting
Frost protection for the plant Off / On On
The necessity to activate frost protection for the plant is primarily dependent on the
hydraulic circuit and the location of the heating pipes in the building. If the heating pipes
are not exposed to risk of frost, frost protection for the plant will not be necessary.
Note
Fault status messages
Settings
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