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C E N T R I F U G A L H E A T E R - C S A
Chief Industries, Inc. 800-359-7600 MAINTAINENCE - 416274
Page 43
i.
in: “Condition Specific Faults/No ignition,
Lack of gas with spark present” and “Condition specific Faults/No ignition,
Lack of ignition spark, Gas present”
b.
If ignition is present.
i.
Check position of the flame probe for proper adjustment.
ii.
Defective flame probe. When flame is present, the flame probe contacts should
be in an “open” position. If contacts are “closed”, replace the flame probe.
iii.
Check flame probe wire and replace if defective. Check wire for bare spots and
shorts to ground. Flame probe should not show continuity from either wire to
ground. Check the two wires in the flame probe wire assembly to see if they are
shorting across in the assembly. With the wires removed from the flame probe,
there should be no continuity.
c.
Defective flame sensing relay (power on).
i.
With the switch off, shut off gas supply at heater plumbing with ball valve. Push
the switch to the start position and release. Remember that there is a 30 second
purge delay. After the 30 second purge delay, the flame sensing relay should
have power to the coil for an additional 30 seconds. After 30 seconds elapses
the circuit collapses and the flame lockout light turns on. If the coil does not
activate the contacts within 30 seconds, or the light does not illuminate
afterwards, replace the flame sensing relay.
4.
Symptom: High limit is activated.
a.
Fan limit may be obstructed. Keep the fan screen clean of all foreign material.
b.
Fan motor may be failing. Check the motor to verify that it is obtaining full speed.
c.
Verify that static pressure is not excessive with a static pressure gage. Verify that roof
vents are open and are sufficient in size and quantity. Check the aeration floor for
plugged holes. Verify the grain depth, moisture content and fines in the grain. If any of
these conditions are high the grain level should be lowered.
d.
Firing rate may be too high for the application. Reduce the firing rate.
5.
Symptom: Heater cycles without any external plenum controls in place (power on).
a.
Static pressure is too high, causing the high limit to cycle the unit.
i.
Remove vapor temperature limit from the vapor plumbing line. If unit
continues to cycle, check the following:
1.
The vent area in the bin roof is insufficient. Verify that roof vents are
open and are sufficient in size and quantity. Check the aeration floor for
plugged holes. Verify the grain depth, moisture content and fines in the
grain. If any of these conditions are high the grain level should be
lowered.
2.
The firing rate is too high for the application. Reduce the firing rate.
b.
The vaporizer is too hot.