Spheros thermo 231, Руководство по ремонту

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6 Functional Checkouts Thermo 230 / 231 / 300 / 301 / 350
604
6.3.5.2 Fuel Pump Check on Heaters with Control Unit
1572D
NOTE
On heaters with control unit 1572D the fuel pump may
only be checked by means of the PC heater diagnosis.
The fuel pump and the fuel hoses must be replaced every
5 years.
6.3.6 Fan Motor Check
NOTE
The fan motor check is performed with the burner
installed. If normal conditions are not obtained the fan
motor must be replaced.
Check
– check fan motor bearing condition(binding)
– measure heater power supply voltage
– switch on heater
– measure speed and compare with the diagram below
Thermo 230/231 4400 ±350 24 Volt
Thermo 300/301 5200 ±420 24 Volt
Thermo 230
/301 6200 ±500 24 Volt
6.3.7 Solenoid Valve Check
NOTE
A solenoid valve leaking valve seat shows by rather long
smoke emissions during run-down. In this case fuel keeps
dripping through the fuel nozzle.
Short smoke emissions are normal caused by clearing the
area between solenoid valve and nozzle bore.
Check
CAUTION
Disconnect solenoid valve connector from control unit to
avoid damage to the control unit.
– Check electrics for the following values:
• break voltage 17.0 Volts
• operating voltage 19.2 ... 28.8 Volts
• power consumption at
nominal voltage and 20° C
10 Watts
• nominal current 0.42 Amps
NOTE
With all variants of the control unit the solenoid valve may
also be checked by means of the PC heater diagnosis
(component test).
6.3.8 Nozzle Block Preheater Check
NOTE
At a temperature of < 0° C the heater cartridge in the
nozzle block is activated. The heating period depends on
the heat reflected within the combustion chamber.
Preheating is deactivated when the thermostat ambient
temperature is +8° C.
Power consumption is 130 ±13 Watts at 24 Volt.
Check
– swing burner head open or remove
– disconnect electrical connector
– connect ohmmeter to connector
– using cooling spray cool down thermostat or bridge
– resistance (max. 4.5
Ω
).
20 22 24 26
28
30 32
2500
18
3000
3500
4000
4500
5000
5500
6000
6500
7000
7500
8000 Thermo
350
Thermo
300/301
Thermo
230/231
Voltage
Sp
eed
(1/mi
n.)