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DTF:
Switch-off temperature diff.
Adjustment range
1.0 to 38.0 °F
Default setting 8.0
Recommended setting: 4.0
If the switch-off temperature, DT F, is reached the pump is
de-activated.
Note: the switch-off temperature must be at least 2 degrees
lower than the switch-on temperature.
SMX:
Maximum tank temperature
Adjustment range:
40 to 205 °F
Default setting 140 °F
Recommended setting: 160 °F
If the maximum tank temperature is reached the control will
prevent the pump from operating and heating the tank any
further.
Note: The controller will only allow the tank temperature to
exceed the maximum tank temperature setting when the
optional system cooling function (OCX) is active and the maxi-
mum collector temp (CMX) has been exceeded. In this case
the pump will run to transfer heat from the collector to the tank
to prevent prolonged overheating of the collector. In this case
the tank may be heated until it reaches the emergency shutoff
point of 203 °F and no further heating will be done.
If the maximum tank temperature setting is exceeded the
symbol will be shown on the display.
EM:
Collector temperature limit
Adjustment range:
230 to 400 °F
Default setting: 285 °F
Recommended setting: 285 °F
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).
If the collector temperature limit setting is exceeded the
symbol will be shown fl ashing on the display.
OCX:
Collector cooling
Adjustment: OFF / ON
Default setting: OFF
Recommended setting: ON
This function is used to avoid prolonged periods of excessive
collector temperatures. If the maximum tank temperature is
reached, the solar system will shut off. After this point if the
collector temperature reaches the maximum collector tem-
perature (CMX), the solar pump will activate until the collector
temperature drops below the set point. The tank temperature
may continue to rise, overriding the maximum tank tempera-
ture, but only until it reached the emergency tank shutoff point
of 203 °F.
When the system is actively cooling the collectors (CMX ex-
ceeded) the symbol will be shown fl ashing on the display.
CMX:
Maximum collector temp.
Adjustment range:
210 to 380 °F
Default setting: 250 °F
Recommended setting: 250 °F
Channel only available when
OCX is active
OCN:
Minimum collector limit
Adjustment: OFF / ON
Default setting: OFF
Recommended setting: OFF
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 collec-
tor temperature set point the symbol will be shown fl ashing
on the display.
This function is unnecessary if the system backup heating ele-
ment has a set point maintained at 120 °F.
CMN:
Minimum collector temp.
Adjustment range:
50 to 195 °F
Default setting: 50 °F
Recommended setting: 50 °F
Channel only available when
OCN is active