GF83.70-P-3063C End Heater Operation During the Combustion Interval, Function

GF83.70-P-3063C End Heater Operation During The Combustion Interval, Function
- with CODE (228) Stationary heater [models 203 up to 23.4.04, 209.3 up to 31.5.04, 215 as of 1.6.00 up to 31.8.02, 220 as of 1.6.00 up to 31.8.02, 230.4 up to 08]

Component Identification:

Function sequence
1. The STH heater unit (except model 220) or the STH or HB [ZUH] heater unit (model 220) is in the combustion pause. The circulation pump (A6m1) delivers the coolant via the heat exchanger (2) and the heating and cooling circuits. At a coolant temperature over 72 °C and below 77 °C the blower motor delivers preheated air into the interior; it is activated by the control and operating unit (N18, N22 or N22/7).

2. The end of heater operation is automatically triggered by the STH control unit (A6n1) or the STH or HB [ZUH] control unit (A6n1) once the maximum heating period has expired, either manually by means of the STH switch (N72s12 or S46) or using the STH radio remote control transmitter (A8/3).

On model 230 as from 1.6.04 when heater operation is ended using the STH radio remote control transmitter (A8/3) visual feedback is given on the STH radio remote control transmitter (A8/3).
If the radio connection is OK, the LED illuminates with a steady red light for approx. 2 seconds after the time of signal transmission. If the radio connection is not OK, the LED flashes red for approx. 2 seconds.

3. The STH control unit or the STH or HB [ZUH] control unit (A6n1) switches off the circulation pump (A6m1) and sends the "blower Off" signal over CAN-B (CAN-B) to the control and operating unit (N18, N22 or N22/7).

4. The control and operating unit (N18, N22 or N22/7) switches off the blower motor and changes from the stationary heater mode to its standard operating mode.

5. Heater operation is over. The indicator lamp in the STH switch (N72s12 or S46) is off.