Control System
Eng
lish
Functional principle:
It is taken for granted, that
Heating Unit Mod. 311
is connected according to instructions
and is ready for use.
Heating unit is activated -> main switch stands on position
- 1 -
then circulation pump is
running and the water circulates in the water circuit.
Heating element is plugged and is this way ready for use, which means:
If return water flow temperature drops lower than the adjusted value, heating element starts to
heat. Control lamp illuminates at heating element.
Heating unit warms up the water until the adjusted water temperature value is reached at the
temperature sensor (a desired temperature of return water flow is adjusted at the temperature
sensor, mounted on the return flow pipe).
After having reached this target value, heating element turns off.
Control lamp at the heating element stops to illuminate. If return flow water temperature reaches
the value lower than the adjusted value, the heating element switches on and begin to heat again
automatically.
21
Main Control Switch Position:
0 = OFF
circulation pump and heating element are out of service.
1 = ON
circulation pump runs constantly, heating element switches on / off automatically.
Water temperature at the thermostat must be adjusted at min. 7-10° C.
Factory adju 10° C
0
1
Return water
flow thermostat
Main Switch
0 = OFF
1 = ON
Electric
connection
controler
/ pump
Electric
connection
heating unit
Pump
Boil protection
thermostat
Socket for
heating element
