43
Some more hints:
Fig. 21: bypass valves
The bypass valve V4 (28) is either falsely activated during combustion, or the
plunger jams. In this case, the oxygen flows through the bypass valve into the IR-
cell and not through the furnace. The furnace remains nonetheless under oxygen
pressure.
• Measure the voltage to the bypass valve V4 (28)
24 Volts DC while the furnace is open is normal.
Zero volts when the furnace is closed is normal.
Other false controls from the electronics:
– Clean the valves
– Replace inadequate contact points in the oscillating circuit
Pos: 5.15 /0 020 Über sc hrif ten /ELT RA 1.1 Über sc hri ften /11 Elec tr onic - dri vers m alfunc tioni ng ELTR A @ 6\mod_1368609174185_9.docx @ 40270 @ 222 @ 1
3.6 19BElectronic- drivers malfunctioning
Pos: 5.16 /00 10 E LTR A/ 0015 ser vic e_ins tr ucti ons /CS -800 _Ser vic e/ 001 5 Fehl er /01 40 M od ul El ektr oni k - Tr eib er Fehlf unktio n ELTR A @ 6\mod_1377688601518_9.docx @ 46567 @ 324 @ 1
IC 15 and 16 are electronic driver integrated circuits, found on the mother
Microcontroller board.
Their Type No. of the driver chips is ULN 2803 or TD 62083.
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