8 Repair Thermo E 200 / 320
810
coolant outlet (6) and secure with hose clamps
applying a tightening torque of 6 ± 0.6 Nm.
4. If existing, open water taps.
5. Install burner (see 8.2)
6. Purge coolant circuit (see 8.14.2).
8.13 Heater removal and installation
NOTE
The fuel supply system must be subsequently
bleeded (see 8.14.1).
The coolant circuit must be subsequently bleeded
(see 8.14.2).
Removal
1. Remove burner (see 8.2)
2. Remove heat exchanger (see 8.12).
Installation
1. Install heat exchanger (see 8.12)
2. Install burner (see 8.2)
3. Bleed coolant circuit (see 8.14.2).
4. Bleed fuel supply system.
8.14 Start-up after burner, heater or heat
exchanger installation
Coolant and fuel connections must be checked for leak-
tightness and tight fit during the test run.
If a malfunction occurs during heater operation, trouble-
shooting must be performed (see chapter 5).
8.14.1 Bleeding of the fuel system
If combustion does not start when the heater is started for
the first time, the heater must be switched off and on
again.
Small air bubbles in the fuel line are released via the
atomizer nozzle in the combustion chamber.
Until the fuel line is completely bleeded, flame extinction
may occur.
The flame will be re-ignited up to 5 times. After that the
heater will be interlocked.
For operation using a long fuel supply line, check valves
and/or a fuel filter in the fuel supply line, we recommend
to fill the supply line prior to first heater start-up.
8.14.2 Bleeding of the water circuit
NOTE
The water circuit must be principally bleeded
according to manufacturer specification.
CAUTION
Risk of injuries for coolant with increased tempera-
ture.
The Aquavent 5000 (U4814) and Aquavent 6000S
(U4855) circulating pumps may only be switched on for
bleeding, after dry operation can be excluded.
The Aquavent 5000S (U4854) and Aquavent 6000SC
(U4856) circulating pumps may even in dry operation be
switched on for bleeding.
Adjust the vehicle heating system to "warm" and refill
coolant.
As soon as it is confirmed that the vehicle engine is filled
with coolant, run vehicle engine with increased idle speed.
Once the cooler thermostat opens, switch the vehicle
engine off and check the coolant level. Refill coolant as
needed.
While the vehicle engine is switched off, switch on the
heater with the circulating pump and the vehicle heating
fan.
After the engine motor cooled down, the heater must auto-
matically start and stop as soon as the upper switching
threshold is reached.
If the heater does not start automatically, it must be veri-
fied, whether the heater overheating protection is trig-
gered and the heater is interlocked.
Release the heater (see 4.5) and repeat the bleeding
process.
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