gf8370s2002sb

Terminate heater operation, function

Type gf · topic 83.70 · version 0102 · 2005-10-07

Applies to: MODEL 639.601 /603 /605 /701 /703 /705 with ENGINES 646.982 /983 with CODE (HZ9) Heater booster MODEL 639.711 /713 /811 /813 /815 with ENGINE 646.982 with CODE (HZ9) Heater booster

Where it sits

Function group 3 Body › 83 Climate control › 83.70 Auxiliary/supplementary heater — Series 639 (models 601, 603, 605, 701, 703, 705, 711, 713, 811, 813, 815) · Series 646 (models 982, 983)

GF83.70-S-2002SB

Terminate heater operation, function

20.1.04

MODEL 639.601 /603 /605 /701 /703 /705 with ENGINES 646.982 /983 with CODE (HZ9) Heater booster

MODEL 639.711 /713 /811 /813 /815 with ENGINE 646.982 with CODE (HZ9) Heater booster

If the status of the circuit changes from "Ct. 15 ON" to "Ct. 15 OFF", the STH fuel metering pump (M46/1) is switched off and thus the combustion is stopped. The run-on time A6for cooling the STH heater (A6) and for purging the combustion chamber is activated for approx. 120 s. The combustion air blower (A6m1) runs for approx. 30 s in partial load operation and for approx. 90 s in full load operation.

While the heater is in operation, the system will stop under the following conditions:

Undervoltage or overvoltage

Flame-out

Overheating

Fault in the flame sensor (A6r2) or the temperature sensor (A6b1)

Heater booster, location/task/design/function

GF83.70-S-2101SB

Referenced documents