GF83.70-D-2002HL Terminate Heater Operation, Function

GF83.70-D-2002HL Terminate Heater Operation, Function
MODEL 906.111 /113 /131 /133 /135 /153 /155 /211 /213 /231 /233 /235 /253 /255 /611 /613 /631 /633 /635 /637 /653 /655 /657 /711 /713 /731 /733 /735
- with CODE (H12) Warm water auxiliary heater
- except CODE (JK3) High-end instrument cluster with speedometer in km
- Stationary heater (STH)

MODEL 906.611 /613 /631 /633 /635 /637 /653 /655 /657 /711 /713 /731 /733 /735
- with CODE (HZ5) 10 kW warm water auxiliary heater with timer
- except CODE (JK3) High-end instrument cluster with speedometer in km
- Stationary heater (STH)

After elapse of the runtime of t(max) = 1 h, a status change from "circuit 15 ON" to "circuit 15 OFF", a status change from "circuit 61 ON" to "circuit 61 OFF" or by deactivation one of the 3 switch-on times in the instrument cluster (A1) using the warm water stationary heater switch (S46/11) or the "M button" on the instrument cluster and the "+ and - button" or the "Reset button (0)" on the instrument cluster, stationary heater (STH) operation or heater booster (ZUH) operation of the stationary heater unit is terminated via the warm water auxiliary heating control unit (N33/3).t
The instrument cluster sends the message "VWZ_STH_MFL (timer status)" via the Controller Area Network bus class B (interior) (CAN-B).

The warm water auxiliary heating control unit reads in the message and then interrupts actuation of the following components needed for the particular heater operation of the stationary heater unit:
- Blower motor (N33/3m1) of STH combustion air blower, for combustion air supply
- Glow pin (N33/3r1), for preheating the combustor with downpipe and for ignition of the fuel
- Metering pump (M46/1), for fuel supply
- Circulation pump (M13/4), for coolant circulation

integrated in the warm water stationary heater switch is also directly interrupted via one discrete line each. The red or yellow LED goes out.
The red LED goes out if the particular heater operation of the stationary heater unit was deactivated.

The yellow LED goes out if the switch-on times in the instrument cluster were set and deactivated, but the STH heater operation of the stationary heater unit has not yet been activated.
After heater operation has been shut off, the stationary heater unit switches to power-down mode. In power-down mode, the warm water auxiliary heating control unit actuates the blower motor of the STH combustion air blower and the circulation pump again in order to cool off the combustor with downpipe of the stationary heater unit through the generated air suction and the heat exchanger of the stationary heater unit through the coolant flowing by. The warm water auxiliary heating control unit places the message "STH_EIN (STH switched on)" or the message "STH_ZHZ_EIN (heater booster function is activated)" on the CAN-B until power-down has been terminated.