Troubleshooting - Dunkirk Quantrum 90-50 Installation Manual

Important
1. I
n a reset from lockout condition, all electrical meter readings at the gas control valve (24 vac) must be taken within the
trial for ignition period.
2.
If any component does not function properly, make sure it is correctly installed and wired before replacing it.
3. Static electricity discharge can damage the integrated boiler control (IBC). Touch metal surface to discharge static electricity
before touching IBC.
4. The IBC cannot be repaired. If it malfunctions it must be replaced.
5.
Only trained, experienced service technicians should service the IBC systems. Following troubleshooting, check out the
system following the sequence of operation section of this chapter for a normal light off sequence.
6.
All controls are factory tested in the assembly process and a defective control is generally the least likely cause. If you suspect
you have a defective control, read through the troubleshooting chart before you replace it.
7.
It is extremely unlikely that the two consecutive controls are defective. If it seems to be happening, chances are that either
there is nothing wrong with the contorl or it is being damaged by some other problem (an electrical short burning out a
transformer, for example).
Initial Service Checks
1.
Before troubleshooting:
A. Make sure that circuit breaker is on or fuse is ok at electrical panel.
B. Make sure that service switch is on.
C. Make sure that gas is on at the gas meter, at all appropriate manual shutoff valves and at the gas control valve.
D. Make sure that the thermostat is calling for heat.
E. Check that wire connectors at the integrated boiler control and at the originating control are securely plugged in or con-
nected.
F. Check that hoses are securely connected and are not plugged in or damaged.
2.
Troubleshooting tools:
A. Voltmeter to check 120 vac and 24 vac
B. Continuity tester.
C. Inclined manometer or pressure gauge with 0-2.0" Range (0.01" Scale) for measuring suction pressures at pressure switch.
D. U-tube manometer or differential pressure gauge with 0-14" range (0.1" Scale) for measuring inlet and manifold gas pres-
sures.
3. What is system status?
A. Consult the chart on the following page.
Figure #16
B. shows the location on the boiler of the diagnostic indicator lamps.

TROUBLESHOOTING

!
Fire, explosion or shock hazard may cause property dam-
age, severe injury or death. Do not attempt to modify the
physical or electrical characteristics of this boiler in any
way.
WARNING
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