701
Thermo E+ 120/200/320
7 Servicing
7
Servicing
7.1
General
The safety information and regulations in Chapter 1
(see
) must be adhered.
7.1.1 Heater servicing
For risk of overheating, the battery main current may not
be disconnected, while the heater is operating or in purge
cycle.
Make sure that the circulating pump is running while the
heater is switched on for tests/inspections.
7.2
Servicing
In order to ensure long-term functional reliability, the follo-
wing maintenance activities should be performed on the
heater.
7.2.1 Periodic heater maintenance
Scope and intervals of the periodic maintenance of the
heater can be found in
of this Workshop
Manual.
7.2.2 CO
2
Measurement and setting
CO
2
Measurement
The exhaust should not be measured directly at the
exhaust outlet of the heat exchanger, as this may cause
inaccuracies.
Exhaust fumes should be sampled from the exhaust pipe
in a distance of 350 mm after the heat exchanger. At this
place also the measurement of the exhaust gas
temperature should be performed. If no exhaust pipe is
connected for this measurement a flexible hose of approx.
500 mm length (see accessories catalog) can be installed.
Increased exhaust temperature may indicate a sooted
heat exchanger (see
) or a non-switched filter
heating.
1. After a combustion period of approx. 3 min. measure
the CO
2
content in the exhaust and compare it with
.
2. Determine smoke number as needed. Target value
according to Bacharach:
≤
4. (at romm temperature).
A factory set combustion air amount change is permitted
an can be achieved by rotation of the adjustment ring.
The measurement of the CO
2
content in the exhaust gas
and the adjustment of the combustion air amount is to be
performed:
•
after repairs at the burner
•
in case of combustion irregularities
•
in the course of a functional inspection
•
after fuel nozzle replacement
•
for application adaption
•
for permanent operation at large altitudes
CO
2
Setting
1. Measure or read from diagnosis the heater input
voltage.
2. Operate the heater approx. 3 min.
3. Measure the CO
2
content and compare readings with
4. Loosen the fixation screw (see
) and rotate
the adjustment ring with the fixation screw until the tar-
get value is reached.
5. Torque fixation screw to 2.0 + 0.5 Nm and apply lok-
king compound.
NOTE:
The CO
2
setting depends on the fuel (viscosity) and
the geodesic altitude (Delta 0.17 … 0.13 Vol-% per
100 m).
Danger to life and health!
Warning!
Fig. 701 Fixation screw for CO
2
setting
Fixation
screw
Summary of Contents for Thermo E+ 120
Page 64: ...memos...
