515
Thermo G
5 Troubleshooting
does not stop immediately, the gas regulator must be
replaced.
5.5.11.3 Test of the electrical functionality of the
solenoid valves at the gas pressure
regulator
ATENTION:
The replacement of one or both solenoid valves at the
gas pressure regulator is not permitted.
If one or both solenoid valves on the gas regulator
does not function correctly, the gas regulator must be
replaced.
The electrical function of the solenoid valves can be
tested manually.
Manual test:
1. Disconnect the heater from the vehicle electrical
system.
2. Shut-off gas supply to the gas pressure regulator.
3. Disconnect plug „V“ from the control unit.
4. Check electrical function by applying 24VDC:
– Opening voltage:
as of 17,0 Volt
– Power consumption at
24V and 20°C:
24 Watt
– Rated current at 24V:
1,0 Ampere
The solenoid valve must open audibly when applying
the DC voltage.
5. Reconnect the plug „V“ to the control unit.
5.5.11.4 Testing the safety valve on the gas pressure
regulator
If the intake valve is open (MV1) no gas must escape at
the safety valve’s hose connection. If gas escapes, the
gas pressure regulator must be replaced.
5.5.11.5 Checking for accumulations of oil and
condensation in the gas pressure regulator
Possible accumulations of oil and condensate must be
drained by unscrewing the drain plug on the gas pressure
regulator. If larger amounts have accumulated, testing
must be done to establish whether the quarterly draining
interval was adhered to. If the result is positive, the
interval must be shortened.
In the event that solid particulate matter is found in the oil/
condensate, the gas pressure regulator must be replaced.
After the test, the drain plug must be screwed in with a
tightening torque of 8 ±1 Nm.
Fig. 507 Solenoid valves at the gas pressure regulator
High pressure
Low pressure solenoid valve
(MV2)
solenoid valve (MV1)
Fig. 508 Oil drain screw at the gas pressure regulator
Oil drain screw
