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Antifreeze function
The antifreeze function activates the loading circuit between the collector and the
store when the temperature falls below the adjusted temperature CFR O. This will
protect the uid against freezing or coagulating. If CFR F is exceeded, the solar
pump will be switched off again.
The antifreeze function will be suppressed if the store temperature of the selected
store falls below 5 °C. In 2-store systems, the function then switches to the second
store or, in the case of store loading in layers, to the upper store zone. If the tem-
perature of the second store (or of the upper store zone respectively) also falls
below 5 °C, the system will be switched off.
Note
In systems with east- / west collectors, 2 separate menus (COL and COL 2)
will be displayed.
Note
Since this function uses the limited heat quantity of the store, the anti-
freeze function should be used in regions with few days of temperatures
around the freezing point.
OCFR (2)
Antifreeze function
Selection: OFF / ON
Factory setting: OFF
CFR(2)O
Antifreeze temperature on
Adjustment range:
-40 … +8 °C
Factory setting: 4 °C
CFR(2)F
Antifreeze temperature off
Adjustment range:
-39 … +9 °C
Factory setting: 5 °C
OCFR
PUSH
OK
OFF ON
c
a
BACK
PUSH
BACK
PUSH
7
Drainback option
In a drainback system the heat transfer uid will ow into a holding tank if solar
loading does not take place. The drainback option initiates the lling process if solar
loading is about to start. If the drainback option is activated, the following adjust-
ment can be made:
Note
A drainback system requires additional components such as a holding tank.
The drainback option should only be activated if all components required
are properly installed.
Time period – switch-on condition
The parameter tDTO is used for adjusting the time period during which the
switch-on condition DT O must be permanently fullled.
Filling time
The lling time can be adjusted using the parameter tFLL. During this period, the
pump runs at 100 % speed.
Stabilisation
The parameter tSTB is used for adjusting the time period during which the switch-
off condition will be ignored after the lling time has ended.
ODB
Drainback option
Selection: OFF / ON
Factory setting: OFF
LOAD 7
PUSH
ODB
PUSH
tDTO
Time period - switch-on condition
Adjustment range: 1 … 100 s
in steps of 1 s
Factory setting: 60 s
tSTB / Stabilisation
Adjustment range: 1.0 … 15.0 min
in steps of 0.5 min
Factory setting: 2.0 min
tFLL / Filling time
Adjustment range: 1.0 … 30.0 min
in steps of 0.5 min
Factory setting: 5.0 min
OK
OFF ON
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