Volkswagen Golf Service & Repair Manual: Functional description
| The auxiliary and supplementary heater can be started by
means of the remote control, the instant heating button or
appropriate programming in the central monitor. The
supplementary heater mode is started automatically by the
vehicle electronics system once all the necessary preconditions
have been met
→ Chapter. |
| For vehicles with a high-voltage system and an auxiliary
heater (installed as optional equipment) the control of the
auxiliary heater or the high-voltage heater (PTC) -Z115- is
coordinated between the operating unit of the Climatronic
control unit -J255-, the battery regulation control unit -J840-
and the control unit for high-voltage battery charging unit
-J1050- (installed in the power and control electronics for
electric drive -JX1-). |
| The auxiliary heater (and the high-voltage heater (PTC)
-Z115- on vehicles with a high-voltage system) is designed to
heat the passenger compartment via the coolant circuit of the
engine. |
| Depending on the heat energy generated and emitted, there
are various operating states of the auxiliary heater (full load,
partial load, control interval). |
| Initially, the fresh air blower -V2- and the combined glow
plug with flame monitoring -Q8- are subjected to a functional
test and then the glow plug with flame monitoring -Q8- goes
through a preheating phase. |
| The subsequent starting process depends on the coolant
temperature, among other things, and can therefore vary in the
amount of time it takes. The fuel is supplied, the glow plug
with flame monitoring -Q8- is switched off in stages and the
flame monitor is activated. |
| After completion of the starting phase, the heater unit
operates under full load and further load control (sparking
mode, full load, partial load and controlled waiting period)
takes place on the basis of the following coolant temperature
thresholds. |
| Auxiliary and supplementary heater: auxiliary heater mode |
| – |
Standard operating temperature: approx. 82 °C |
| – |
Change to controlled waiting period: approx. 88 °C |
| Auxiliary and supplementary heater: supplementary heater
mode |
| – |
Standard operating temperature: approx. 82 °C |
| – |
Change to controlled waiting period: approx. 88 °C |
| The reference resistance of the glow plug with flame
monitoring -Q8- is automatically re-determined during the
starting or run-on phase, depending on the unit. This is done to
compensate for ageing-related changes. |
| As a consequence of this calibrating procedure, processes
that are affected can also require more time. |
| After expiry of the maximum operating time of 60 min or
after manual shutdown by means of the remote control or the
instant heating button, the auxiliary and supplementary heater
is switched off. |
| The booster heater is switched off if at least one of the
defined switch-on criteria is no longer met
→ Chapter. |
| After switch-off, operation of the metering pump -V54- is
stopped immediately. |
| The combustion air blower -V6- and the glow plug with flame
monitoring -Q8- continue to operate for a limited time in order
to burn the remaining fuel still in the system and to cool the
burner components. |
| The run-on period of the heater can vary depending on the
software version and load level at the time of switch-off. |
|
|
|
Once the coolant temperature has reached approx. 84 °C, the
control unit switches to energy-saving control mode. If the
coolant temperature continues to ri ...
© 2016-2024 Copyright www.vwgolf.org
Supplementary heating mode