Get Regulation of auxiliary air heater Guide for Volkswagen Transporter Van Sixth generation (2015-2021)

Transporter 2020 ➤

Auxiliary heater - Edition 04.2020

9

Regulation of auxiliary air heater

⇒ “9.1 Principle of auxiliary air heater operation”, page 54

⇒ “9.2 Function of auxiliary air heater operating and display unit

E407 or roof display unit J702 ”, page 56

⇒ “9.3 Removing and installing auxiliary air heater operating and

display unit E407 or roof display unit J702 ”, page 57

9.1

Principle of auxiliary air heater operation

Note

♦ Make sure that the auxiliary air heaters are operated only with diesel fuel. Operation with biodiesel can lead

to malfunctions and damage.

♦ The heaters only have one electric motor. The motor pumps the heating and combustion air.

1 - Electrical connection

2 - Fuel supply

Pfeil A - Cold air in

Pfeil B - Hot air out

Pfeil C - Combustion air in

Pfeil D - Exhaust out

Switching on

The warning lamp in the control element lights up when the unit

is switched on. The glow plug is switched on and the combustion

air blower runs at slow speed.

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Rep. gr.82 - Supplementary heating

Transporter 2020 ➤

Auxiliary heater - Edition 04.2020

Note

♦ If there is still too much residual heat in the heat exchanger

from a previous heating operation, only the combustion air

blower starts up at first (cold blowing).

♦ The »start« takes place once the existing residual heat has

been dissipated.

Start of auxiliary air heater

Fuel delivery starts after about 60 seconds and the fuel/air mixture

in the combustion chamber ignites. The glow plug is switched off

60 seconds after the combination sensor (flame monitor and

overheating sensor) has detected the flame.

The heater is now in control mode and reaches the “Power” gov‐

ernor state after a short duration.

Temperature selection with control element

The desired interior temperature is preselected using the control

dial. The value to be set can be chosen from a range of between

+10°C and +30°C, depending on the version of the heater unit

installed as well as the volume of the space to be heated and the

prevailing ambient temperature.

The setting to be selected on the control knob in this case is based

on experience.

Heater regulation

The room temperature or temperature of the drawn heated air is

continuously measured during heating. Regulation starts if the

temperature is higher than the temperature selected on the con‐

trol element.

There are 4 control levels provided in order that the heat flow de‐

livered by the heater can be finely adjusted to the heat demand.

The blower speed and fuel volume correspond to the particular

control level in this case.

If the set temperature is still exceeded even at the lowest control

level, then the heater unit enters control level “Off”, and the blower

continues to operate for about 4 minutes to cool down.

Then, until the restart, the combustion air blower continues to run

at minimum speed (recirculated air mode) or is switched off (fresh

air mode).

Switching off

When the heater unit is switched off, the warning lamp goes out

and the fuel delivery is switched off. The blower continues oper‐

ating for about 4 minutes to provide cooling.

For cleaning, the glow plug is switched on for 40 seconds during

the blower run-on.

Note

The heater unit is switched off without any run-on time if no fuel

was pumped before the switch-off or if the heater unit is in the

control level “OFF”.

Control and regulating units for auxiliary air heater

♦ The start is repeated if the heater unit does not ignite within

90 seconds after fuel delivery starts. A malfunction shut-off

occurs if the heater does not ignite after another 90 seconds.

That means that fuel delivery will be ended and blower run-on

9. Regulation of auxiliary air heater

55

Transporter 2020 ➤

Auxiliary heater - Edition 04.2020

will continue for about 4 minutes. The control unit is locked out

after the permitted number of unsuccessful start attempts has

been exceeded.

♦ If the flame goes out by itself during heating operation, a new

start is performed initially. If the heating unit does not ignite

within 90 seconds after fuel delivery restarts or if it ignites but

goes out within 15 minutes, a malfunction shut-off occurs. That

means that fuel delivery will be ended and blower run-on will

continue for about 4 minutes.

Note

♦ The malfunction shut-down can be revoked by briefly switch‐

ing off and back on again.

♦ Do not repeat the switch on/off procedure more than twice.

♦ Overheating causes the combination sensor (flame monitor/

overheating sensor) to be tripped, the fuel supply is interrupted

and a malfunction shut-down is performed. Once the cause of

overheating has been eliminated, the heater unit can be re‐

started by switching off and back on again. The control unit is

locked out after the permitted number of unsuccessful start

attempts has been exceeded.

♦ A malfunction shut-down will occur 20 seconds after the lower

or upper voltage limit has been reached.

♦ The heater unit will not start if the glow plug or the blower motor

is defective, or if there is a discontinuity in the electrical cable

to the metering pump.

♦ If the combination sensor (flame monitor/overheating sensor)

is defective or there is a discontinuity in the electrical cable,

the heater unit starts and the malfunction shut-down occurs

only during the start phase.

♦ The speed of the blower motor is continuously monitored. A

malfunction shut-down will occur after 30 seconds if the blower

motor does not start or if the speed fluctuates by more than

10%.

♦ When the heater unit is switched off, the glow plug is switched

on for 40 seconds during blower run-on (post-glow) to burn off

combustion residues.

Switching off in an emergency

If an emergency shut-off (emergency off) is required during op‐

eration, proceed as follows:

•

Switch off heater unit via control element, or

Pull out fuse, or

Isolate heater unit from battery.

9.2

Function of auxiliary air heater operating and display unit - E407- or roof

display unit - J702-

56

Rep. gr.82 - Supplementary heating

Transporter 2020 ➤

Auxiliary heater - Edition 04.2020

1 - Selected settings (temper‐

ature, blower speed) display

2 - Increase blower output but‐

ton

3 - Decrease blower output

button

4 - OK

❑ Depending on equip‐

ment

5 - OFF button for switching

rear air conditioning system

on/off

❑ Depending on equip‐

ment

6 - Air distribution selection dis‐

play

7 - AUTO function button

❑ This button is used to

switch the automatic

mode of the Climatronic

for the rear area on or

off.

8 - Button for switching the in‐

stant heating function of the

auxiliary/supplementary heat‐

er on/off

❑ Depending on equip‐

ment

9 - Adjustment button for lower

temperature setting

10 - Adjustment button for

higher temperature setting

9.3

Removing and installing auxiliary air

heater operating and display unit -

E407- or roof display unit - J702-

Special tools and workshop equipment required

♦ Removal wedge - 3409-

9. Regulation of auxiliary air heater

57

Transporter 2020 ➤

Auxiliary heater - Edition 04.2020

Note

If the display of the auxiliary heater operating and display unit -

E407- or roof display unit - J702- flashes, there is a fault in the

system.

Removing

– Remove storage compartment in headliner ⇒ General body

repairs, interior; Rep. gr. 68 ; Compartments and covers; Re‐

moving and installing storage compartment in headliner .

– Disconnect electrical connectors for rear Climatronic operat‐

ing and display unit - E265- -1-.

– Detach rear Climatronic operating and display unit - E265-

-1- at retaining tabs -arrows-, and remove it.

Installing

Install in reverse order of removal.

58

Rep. gr.82 - Supplementary heating

Regulation of auxiliary air heater for Your Volkswagen Transporter Van Sixth generation (2015-2021)

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