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Heating circuit controller
57
Further possible displays under "OPERATION":
FROST PROT
The frost protection function is activated. The activation conditions are described
in the section "Frost protection".
EXT/STANDBY
The input variable „External Switch“ is a digital "
ON
" signal.
MAINTENANCE
The maintenance function is active (see function "Maintenance"). The flow tem-
perature is controlled to match the setting T.flow MAX set in the menu HEAT
CURVE. The function module remains active for three minutes after mainte-
nance mode has been switched off.
FAULT
If the line to the external sensor (measuring value > 100°C) is interrupted, the
heating circuit is switched off. In the worst-case scenario, the system may be
damaged by frost. To prevent such damage, the heating circuit is operated ac-
cording to a set outdoor temperature of 0°C if the outdoor temperatures are
clearly too high, and
FAULT
is displayed under "OPERAT:".
Status of the heating circuit pump and the mixer
relative to the operation mode and releases:
Operation mode
Enable
heating
circuit
Enable
pump
Enable
mixer
Status:
pump
Status:
mixer
X
OFF x
x
OFF OFF
Maintenance
x
x
x
ON
AUTO
1
Standby,
external standby
x x x OFF
OFF
Frost protection,
fault
ON x
ON ON
AUTO
OFF ON
OFF
Time / Auto,
standard,
setback
party,
bank holiday,
holiday
ON
OFF OFF
OFF OFF
ON OFF AUTO OFF
OFF ON
OFF OFF
2
ON ON AUTO
AUTO
RS
ON
as with Standby, Time/Auto, Standard, Setback,
x
…
Status and operation mode do not matter
1
…
In this case, AUTO means that the settings for T.flow MAX are used in the menu HEAT
CURVE.
2
…
OFF does not apply if in "SHUTDOWN CONDITION" the setting "control" is set under "if heat-
ing circ. OFF => MIXER:"