41
CMX / CMX1 / CMX2:
Maximum collector temp.
Adjustment range:
150 ... 320 °F
[70 ... 160 °C]
in steps of 1 °Ra [1 K]
Factory setting:
230 °F [110 °C]
Collector cooling function
When the collector cooling function is activated, the controller
aims to keep the collector at an operational temperature.
When the adjusted maximum tank temperature is reached,
solar loading stops. If the collector temperature increases to
the adjusted maximum collector temperature, the solar pump
is activated until the collector temperature falls at least 10 °Ra
[5 K] below the maximum collector temperature. The tank
temperature may increase (subordinate active maximum tank
temperature), but only up to 200°F [95 °C] (emergency shutdown
of the tank).
If the collector cooling function is active,
and
(flashing)
is shown on the display.
OCC / OCC1 / OCC2:
Option collector cooling
Adjustment range: OFF / ON
Factory setting: OFF
Note:
This function will only be available if the system
cooling function (
OSYC) is deactivated.
When the system cooling function is activated, the controller
aims to keep the solar system operational for a longer time.
The function overrides the maximum tank temperature to
provide thermal relief of the collector field and the heat
transfer fluid on hot days.
If the tank temperature is higher than the maximum tank
temperature (
S MX / S1MX) and the switch-on temperature
difference
DTCO is reached, the solar system remains
activated. Solar loading is continued until either the tank
temperature reaches 200 °F [95 °C] (emergency shutdown of
the tank), the temperature difference falls below the adjusted
value
DTCF or the collector emergency shutdown temperature
EM is reached.
If the system cooling function is active,
and
(flashing) is
shown on the display.
System cooling function
OSYC:
Option system cooling
Adjustment range: OFF / ON
Factory setting: OFF
DTCO:
Switch-on temperature diff.
Adjustment range:
2.0 ... 60.0 °Ra
[1.0 ... 30.0 K]
in steps of 1 °Ra [0.5 K]
Factory setting:
40.0°Ra [20.0 K]
DTCF:
Switch-off temperature diff.
Adjustment range:
1.0 ... 59.0 °Ra
[0.5 ... 29.5 K]
in steps of 1 °Ra [0.5 K]
Factory setting:
30.0 °Ra [15.0 K]
Note:
This function will only be available if the collector
cooling function (
OCC) is deactivated.
Note:
In 2-tank-systems, the cooling functions will only
affect tank 1, respectively the bottom area of the tank
(such as in Arr = 4).
Cooling functions
In the following the three cooling functions – collector cooling,
system cooling and tank cooling – are described in detail. The
following notes are valid for all three cooling functions:
Note:
The cooling functions will not become active as long
as solar loading is possible.
Note:
In system layout 10, the parameter
CMX is available
without the
OCC function. In system layout 10, CMX
is used to set the activation temperature for the
heat dump function. No other switch-on condition
is needed in that case.
Summary of Contents for SOM 7 PLUS
Page 51: ...51...
