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TMN:
Minimum runtime
Adjustment range
1 to 10 min
Recommended setting: 2
min
TAR:
Pump speed control target
temperature
Adjustment range
70 to 210 °F in steps of 2 °F
Recommended setting: 140
°F
n1MN, n2MN:
Minimum pump speed
Adjustment range
30 to 100%
Recommended setting: 30%
S MX:
Maximum tank temperature
Adjustment range:
100 to 160 °F
Recommended setting: 160
°F
EM:
Collector temperature limit
Adjustment range:
170 to 390 °F
Recommended setting: 270
°F
OCN:
Minimum collector limit
Adjustment: OFF / ON
Recommended setting: OFF
Solar loading will be carried out for the adjustable minimum
runtime TMN during which the switch-off condition will be ig-
nored to stabilize the system.
If the temperature difference between the upper heat exchang-
er sensor S4 and the lower heat exchanger temperature sen-
sor S2 falls below the switch-off temperature difference DTF
both loops will be switched off.
Note: The switch-on temperature difference must be at least 1°
higher than the switch-off temperature difference.
The primary and secondary pump speeds are controlled based
on the target temperature of the upper heat exchanger sensor
S4.
The primary and secondary loop pumps will run at minimum
speed until the target temperature at S4 is reached. If the tar-
get temperature is exceeded by 5°, the speed of the primary
loop pump will increase by one step (10%). This state will be
held for 2 min even if the sensor temperature decreases. If,
during this time, the S4 temperature increases by more than
5°, the pump speed of the secondary pump will also increase
by 1 step.
This state will be held for 2 min each time the pumps increase
a step unless the temperature increases further by 5° and the
speed is increased another step. If the temperature decreases
the secondary pump will decrease by 1 step followed by the
primary pump.
A relative minimum pump speed that can be allocated to the
outputs R1 (primary pump) and R2 (secondary pump) via the
adjustment channels n1MN and n2MN.
If the maximum tank temperature is reached the control will
prevent the pump from operating and heating the tank any fur-
ther. A fi xed hysteresis of 4 °F is set for the maximum tank
temperature.
When the maximum tank temperature setting is reached the
symbol will be shown on the display.
If the collector temperature limit is reached the solar pump (R1)
is deactivated in order to avoid damaging overheating of the
solar components (collector emergency shutdown). A hyster-
esis of 20 °F is set for the collector temperature limit.
If the collector temperature limit setting is exceeded the
symbol will be shown fl ashing on the display.
The minimum collector temperature is a minimum switching
temperature, which must be exceeded before the solar pump
(R1) is switched on. The minimum temperature will avoid short
cycling of the solar pump at low collector temperatures. If the
collector temperature is lower than the minimum collector tem-
perature set point the
display.
31
symbol will be shown fl ashing on the
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