Flame With No Call For Heat (Flame Fault); Ignition Lock Out (Failure To Light); Flame Sensor Current Check; Figure 49. Flame Sensor Current Check - Calcana CAL Series Installation, Operation, Service, And Parts Manual

CAL-SERIES

FLAME WITH NO CALL FOR HEAT (FLAME FAULT)

•
If at any time the main valve fails to close completely and maintains a flame, the full time flame
sense circuit will detect it and energize the combustion blower. Should the main valve later close off
completely removing the flame signal, the combustion blower will power off.

IGNITION LOCK OUT (FAILURE TO LIGHT)

•
FENWAL DSI Module will attempt three ignition trials before going into lockout. The valve relay will
be de-energized immediately, and the combustion blower will be turned off.
•
Recovery from lockout requires a manual reset by either resetting the thermostat or removing 24
volts, or removing the electrical power supply for a period of 5-seconds.
•
If the thermostat is still calling for heat after one hour, the control will automatically reset and
attempt to ignite the burner again.
If unit still does not operate, proceed as follows:
•
Check flame sensor current. (see below)
•
Check electrode for cracks and proper location, (see page 71)

FLAME SENSOR CURRENT CHECK

Figure 49. FLAME SENSOR CURRENT CHECK

SERVICE CHECKS
Flame current is the current which
passes through the flame from the
sensor to the ground. The minimum
flame current necessary to keep the
system from lockout is .7 micro amps.
To measure flame current, connect
an analog DC micro ammeter to the
FC- FC terminals per figure. Meter
should read. 7 uA or higher. If meter
reads below "0" on scale, meter leads
are reversed. Disconnect power and
reconnect meter leads for proper
polarity.
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