Midco DS45B - Manual (Page 10)

If, on a call for heat, flame ignition does not occur, refer to the trouble chart for further
information.
If leakage through the valve occurs, as evidenced by the presence of flame on standby,
the entire valve must be replaced.
If the combination valve has been moved or replaced, soap bubble test for leaks with the
burner running.
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The Electronic Control is a 24 volt AC, solid state electronic device that automatically ignites
and monitors the flame. It has an integral high voltage transformer and, upon a call for heat,
applies high voltage to the spark electrode and 24V to the combination valve. When the
flame is proven, the spark is terminated and the burner run continues.
If the flame is not proven within 6 seconds, or if the proof of flame is lost during the
burner run and not re-established within 6 seconds, the Control will shut off the combination
valve and lock out. To reset the Electronic Control for restart, de-energize the Electronic
Control by setting the operating control to OFF or thermostat below room temperature for at
least 30 seconds.
If the Electronic Control is changed, the replacement must be identical as to the make
and model number, or must be an authorized substitute.
WARNING: Explosion hazard.
Do not use this device if it gets wet. It can malfunction and cause serious
injury or death. Replace any device that has been wet.
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Keep the area around the burner clear and free of combustible materials, gasoline or
other flammable liquids or vapors. Do not obstruct burner air openings or ventilation grills
for combustion air.
The motor features permanently lubricated ball bearings and requires no routine oiling
maintenance.
IMPORTANT: Check the burner flame periodically. A proper NATURAL gas flame will appear
blue at the burner face with orange and yellow tips. A proper PROPANE gas flame will
appear blue at the burner face with yellow tips. If the flame is too rich, it will appear billowy
and yellow with hazy tips. If too lean, it will appear short and all blue. If the flame does not
appear proper, CONTACT A QUALIFIED SERVICE TECHNICIAN FOR CLEANING
AND/OR READJUSTMENT.
WARNING: If any flame is observed when the burner is on standby, or if the
ignition spark or valve operator is heard to come on before the motor reaches
operating speed, immediately turn off the manual gas control and burner power. A
dangerous condition has developed and must be corrected. CONTACT A QUALIFIED
SERVICE TECHNICIAN FOR CLEANING, READJUSTMENT OR REPAIR.
Part 2 Service
Part 2
Service
Continued
XI Combination Gas Valve
Continued
Consumer Instruction
Figure 8: General Assembly
10
Consumer Instruction
Maintenance
XI Electronic
Control System