Webasto HL 90 Owner's Manual - page 30
8 Servicing
HL 90
806
8.7
Removal and Installation
CAUTION
In installed condition only the following disassembly or
removal procedures are permitted should enough space
for removal allow such action:
•
replacement of control unit
•
replacement of glow plug
•
replacement of flame sensor and its receptacle
•
replacement of temperature limiter
8.7.1 Heater, Removal and Installation
8.7.1.1 Removal
1. Disconnect vehicle battery.
2. Disconnect electrical connector of wiring harness from
control unit.
3. Disconnect cable to dosing pump at its disconnect.
4. Disconnect fuel supply inlet on heater. Close fuel line
with plug.
5. Disconnect combustion air inlet and exhaust outlet on
heater.
6. Open tightening straps.
7. Remove heater from supports.
8.7.1.2 Installation
1. Retighten screws of supports with 12 Nm.
2. Locate heater for installation and secure with
tightening straps (locate straps between wiring
harness and outer case).
3. Connect fuel supply line to heater fuel inlet and secure
with clamp tightening to 2 Nm.
4. Secure combustion air inlet and exhaust outlet on
heater.
5. Route cable to dosing pump and reconnect at its
disconnect point.
6. Connect wiring harness connector to control unit.
7. Tighten screws of turnbuckles with 5 Nm.
8. Reconnect vehicle battery.
9. Bleed fuel supply system.
8.7.2 Control Unit, Replacement
NOTE
The replacement procedure for the control unit is identical
with the heater installed or removed.
Perform replacement in accordance with 9.2.1.
8.7.3 Glow Plug, Replacement
NOTE
The replacement procedure for the glow plug is identical
with the heater installed or removed.
Perform replacement in accordance with 9.2.2.
8.7.4 Flame Sensor, Replacement
NOTE
The replacement procedure for the flame sensor is
identical with the heater installed or removed.
Perform replacement in accordance with 9.2.3.
8 7.5 Temperature Limiter, Replacement
NOTE
The replacement procedure for the temperature limiter is
identical with the heater installed or removed.
Perform replacement in accordance with 9.2.4.
8.8
First Operation
After heater installation the fuel supply system must be
thoroughly bled.
NOTE
Long fuel lines may require several switch-ons for priming
the fuel line to the heater.
During a test run of the air heater all connections are to
be checked for no leakage and tight fit. Should the heater
during operation enter an error lockout condition, perform
troubleshooting.