Collector minimum limitation
OCN
Collector minimum limitation option
Adjustment range: OFF / ON
Factory setting: OFF
CMN
Minimum collector temperature
Adjustment range: 10.0 … 90.0 °C
[50.0 … 190.0 °F]
Factory setting: 10.0 °C [50.0 °F]
If the collector minimum limitation option is activated, the pump (R1) will only
be switched on if the adjustable collector minimum temperature is exceeded. The
minimum temperature prevents the pump from being switched on too often at low
collector temperatures. A hysteresis of 5 K [10 °Ra] is set for this function.
If the collector minimum limitation is active, ❄ is displayed (flashing).
Note:
If OSTC or OCF is active, the collector minimum limitation will be over-
ridden. In that case, the collector temperature may fall below CMN.
Antifreeze function
OCF
Antifreeze option
Adjustment range: OFF / ON
Factory setting: OFF
CFR
Antifreeze temperature
Adjustment range: -40.0 … + 10.0 °C
[-40.0 … + 50.0 °F]
Factory setting: + 4.0 °C [+ 40.0 °F]
The antifreeze function activates the loading circuit between the collector and the
store when the temperature falls below the adjusted antifreeze temperature. This
will protect the fluid against freezing or coagulating. If the adjusted antifreeze tem-
perature is exceeded by 1 K [2 °Ra], the loading circuit will be deactivated.
If the antifreeze function is activated, ❄ is displayed. If the antifreeze function is
active, ⓵ and ❄ are displayed (flashing).
Note:
Since this function uses the limited heat quantity of the store, the anti-
freeze function should only be used in regions with few days of tempera-
tures around the freezing point.
The antifreeze function will be suppressed if the store temperature falls
below +5 °C [+40 °F] in order to protect the store from frost damage.
Heat quantity measurement
OHQM
Heat quantity measurement
Adjustment range: OFF / ON
Factory setting: OFF
FMAX
Flow rate in l/min
Adjustment range: 0.5 … 100.0
Factory setting: 6.0
MEDT
Heat transfer fluid
Adjustment range: 0 … 3
Factory setting: 1
MED%
Antifreeze concentration
in Vol-% (MED% is not indicated when
MEDT 0 or 3 is used.)
Adjustment range: 20 … 70 %
Factory setting: 45 %
If OHQM is activated, the heat quantity gained can be calculated and displayed. Heat
quantity measurement is possible if a flowmeter is used.
The heat quantity balancing (estimation) uses the difference between the flow and
return temperatures and the entered flow rate (at 100 % pump speed).
Î Read the flow rate (l/min) and adjust it in the FMAX channel.
Î Adjust the antifreeze type and concentration of the heat transfer fluid in the
channels MEDT and MED%.
Heat transfer fluid:
0: Water
1: Propylene glycol
2: Ethylene glycol
3: Tyfocor
®
LS / G-LS
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