Heating circuit controller
62
FROST PROTECTION
This function is only active in the standby mode or when the input variable "EXTERNAL SWITCH" is
active, and even then only if the module has been partially blocked by the input variable ENABLE
PUMP or a switch-off condition would block the heating circuit pump
. However, if the function is
blocked via Enable heating circuit, there is no frost protection mode.
If frost protection is activated, the set flow temperature is maintained at least at T.flow MIN (setting in
the sub-menu heating curve), until the temperature, which triggered the frost protection function,
increases by 2 K above the frost protection limit. This submenu has the following entries:
Activation if
T.outs.av.c < 5°C
Frost protection function is active below +5°C (outdoor)
T.room FROST: 5°C
and keeps the room at a temperature of 5°C
Heating circuit condition
Frost protection function
Operating mode STANDBY
Set to RAS/RASPT
without activated frost protection function:
T.flow SET set to +5°C, mode display: STANDBY
Activation of the frost protection function:
If T.outs.ACT < T.outs.av.c,
then T.flow SET
≥
T.flow MIN (mode display: FROST PROT.)
Operating mode STANDBY
Controller setting
without activated frost protection function:
T.flow SET set to +5°C, mode display: STANDBY
Activation of the frost protection function:
If T.outs.ACT < T.outs.av.c
or
(if RAS available) T.room ACT < T.room FROST,
then T.flow SET
≥
T.flow MIN (mode display: FROST PROT.)
Switching via digital "ON" at
the "external switch" to
EXT/STANDBY
without activated frost protection function:
T.flow SET set to +5°C, mode display: EXT/STANDBY
Activation of the frost protection function:
If T.outs.ACT < T.outs.av.c
or
(if RAS available) T.room ACT <
T.room FROST,
then T.flow SET
≥
T.flow MIN (mode display: FROST PROT.)
Switching via analogue 64 at
"external switch" to
STANDBY
without activated frost protection function:
T.flow SET set to +5°C, mode display: STANDBY
Activation of the frost protection function:
If T.outs.ACT < T.outs.av.c
or
(if RAS available) T.room ACT <
T.room FROST,
then T.flow SET
≥
T.flow MIN (mode display: FROST PROT.)
Enable pump off
without activated frost protection function:
T.flow SET according to the setting heat curve,
Mode display: selected operating mode
Activation of the frost protection function:
If RAS available: If T.room ACT < T.room FROST the pump is
switched on,
independent of the outside temperature
, then T.flow
SET
≥
T.flow MIN (mode display: FROST PROT.)
Switching off of the pump via
a switch-off condition
without activated frost protection function:
T.flow SET set to +5°C, mode display: STANDBY
Activation of the frost protection function:
If RAS available: If T.room ACT < T.Room FROST the pump is
switched on,
independent of the outside temperature
, then T.flow
SET
≥
T.flow MIN (mode display: FROST PROT.)