Spheros thermo 231, Workshop Manual

Page: 35 / 98

Thermo 230 / 231 / 300 / 301 / 350 6 Functional Checkouts
601
6 Functional Checkouts
6.1 General
This section describes the tests and adjustments on the
heater in installed and removed condition to prove its
serviceability.
WARNING
The heater must not be operated in closed areas like
garages or workshops with no exhaust ventilation
facilities.
To prevent fires do not switch heater on with burner
swung open.
6.2 Adjustments
6.2.1 Adjustment of CO
2
Contents
It is allowed to change the manufacturer’s setting for
combustion air quantity by rotation of the setting ring.
Measurement of the CO
2
value of the exhaust gas must
be performed followed by an adjustment of the combusti-
on air quantity as required in case of:
–
repairs on the burner
– irregularities in combustion
– functional checkouts
– nozzle replacement
Setting procedure
– measure control unit power supply voltage
– operate heater for approximately 5 min.
– measure CO
2
contents and smoke spot number and
compare with relevant diagram
– loosen fastening screw (refer to Fig.) and reposition
setting ring with fastening screw until rated value is
obtained.
– tighten fastening screw with 1.0 +0.5 Nm and apply
screw seal varnish.
NOTE
CO
2
setting depends on fuel (viscosity) and on geodetic
altitude (0.1 % per 100 m).
If proper setting cannot be obtained or when exceeding
smoke spot number, proceed as follows:
–
check burner head air side for damage and replace if
required
– check fuel pump pressure and replace pump if
required
– check fuel filter and strainer in fuel pump for contami-
nation and replace if required
– adjust pressure
– replace fuel nozzle
– measure burner motor speed
18 20 22 24 26 28 30 32
6
7
8
9
10
11
12
13
14
Voltage
CO
2
- setting at 500 m NN
CO
2
(Vol
.-%)
Fastening screw