GF83.70-D-4063H PTC Heater Booster, Component Description

GF83.70-D-4063H PTC Heater Booster, Component Description

- with CODE (HH2) Electric warm air auxiliary heater







1 PTC heater booster
2 Heater or A/C housing
N33/4 Electric PTC heater booster

Location
The PTC heater booster is located in the heater housing or air conditioner housing in front of the front heater heat exchanger.

Task
The PTC heater booster compensates for the heat output deficit occurring under certain operating conditions (e.g. cold start, partial load etc.). The PTC heater booster supports the task of the front heater heat exchanger.

Design
The PTC heater booster comprises a heating register with PTC heater sections and a power regulator integrated in the electric PTC heater booster. A PTC section comprises several ceramic heater elements with a metallic frame. The metallic frame is provided with ribbing on the enlarged surface.

Function
The fundamental principle behind the PTC heater booster is comparable with that of a conventional hot air gun. The heating elements have current applied to them, whereupon they heat up. The structural conditions ensure that the suctioned-in fresh air flows directly through the PTC heater booster and heats up while doing so.
The electrical power produced by the alternator (G2/7) and not required by the on-board electrical system is used by the PTC heater booster for warming up the suctioned-in fresh air.
On vehicles with the Heater variant, except code (HH9) Regulated air conditioning (Tempmatic), the power regulator integrated in the electric PTC heater booster regulates the output as a function of the coolant temperature and of the outside temperature without placing a load on the battery (G1).
On vehicles with the Tempmatic (TM) variant, with code (HH9) Regulated air conditioning (Tempmatic), the power regulator integrated in the electric PTC heater booster regulates the output as a function of the temperature set via the temperature selection switch (S98s14) integrated in the KLA control and operating unit (S98), of the coolant temperature and of the outside temperature without placing a load on the battery.