NGW 300 / LGW 300 / GBW 300
6 Functional tests
603
6.3.5 Testing the ignition spark generator
CAUTION
High voltage! On the ignition electrodes, a voltage of
approx. 8,000 V arcs over.
ATTENTION
Do not supply voltage to the ignition spark generator
without ignition electrodes.
PLEASE NOTE
Damaged sleeves or sleeves which were not pushed up
far enough to seal the ignition electrodes will lead to arc-
over here when there is moisture (condensation) present
Test
–
Use direct current voltage of 24 V (positive on the
black line; negative on the brown line).
–
Target status: ignition sparks on the ignition
electrodes jump over.
6.3.6 Test of the burner motor
PLEASE NOTE
Testing of the combustion air motor is conducted when it
is installed. If the target values are not achieved, the motor
is replaced.
Test
–
Examine the motor for the quality of its bearings
(sluggishness)
–
Measure the rpm
Target rpm at 24 V: 5800 ± 580 min
-1
6.3.7 Vacuum switch test
Test
–
Check plug contacts for corrosion and to make sure
that they are firmly attached.
–
Examine the general condition of the hose to the gas
mixer and check for damage.
–
Examine the vacuum switch’s housing for cracks or
other damage.
–
Examination of the switching function
Target values:
The vacuum switch is open without low pressure.
The vacuum switch must be shut when the low
pressure is 2.5 ± 0.5 mbar.
6.3.8 Gas pressure regulator test
ATTENTION
The gas pressure regulator must not be disassembled.
PLEASE NOTE
Testing is done when the heater is installed.
6.3.8.1 General test
–
Testing plug contacts for corrosion and to make sure
that they are firmly attached.
–
Was the gas pressure regulator replaced after 4
years of operation?
–
When the heater is switched off, no gas may escape
through the outlet to the heater or when solenoids are
open.
–
The supply line connection must be checked for
impermeability
6.3.8.2 Test of the intake valve on the gas pressure
regulator
During the firing operation, disconnect the plug
connection to the inlet valve, The enrichment valve and
the delayed-action solenoid in the gas intake pipe (in the
NGW 300) must still be controlled Combustion must stop
immediately.
If combustion doesn’t stop immediately, the gas pressure
regulator must be replaced.
6.3.8.3 Examination of the functioning of the
enrichment valve on the gas pressure regulator
During the firing operation and under
hot running
conditions, disconnect the plug connection to the
enrichment valve. The CO
2
-content of the exhaust gas
must drop considerably (1,5 - 3 %).
If the CO
2
doesn’t change, the gas pressure regulator
must be replaced.
6.3.8.4 Testing the safety valve on the gas pressure
regulator
If the intake valve is open (applicable to CNG gas
pressure regulators, only), no gas must escape at the
safety valve’s hose connection.
If gas escapes, the gas pressure regulator must be
replaced.