Troubleshooting - Dunkirk Q90-200 Installation, Operation & Maintenance Manual

Fire, explosion or shock hazard may cause
!
severe injury or death. Do not attempt to
modify the physical or electrical characteristics
of this boiler in any way.
• In 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.
• If any component dose not function
properly, make sure it is correctly installed
and wired before replacing it.
• Static electricity discharge can damage
the integrated boiler control (ibc). Touch
metal surface to discharge static electricity
before touching ibc.
• The ibc cannot be repaired. If it
malfunctions it must be replaced.
• Only trained, experienced service
technicians should service the ibc systems,
by following the troubleshooting, check out
the system and the sequence of operation
section of this chapter for the normal light
off sequence.
• All controls are factory tested in the
assembly process. A defective control
is generally the least likely cause of
malfunction. If you suspect the unit has
a defective control, read through the
troubleshooting chart before replacing it.
• It is extremely unlikely that two
consecutive controls are defective. If this
seems to be the case chances are that the
controls are not the cause but rather the
malfunction is due to some other problem
such as an electrical short burning out a
transformer.

TROUBLESHOOTING

DANGER
NOTICE
IMPORTANT
Initial Service Checks
Before Troubleshooting:
1.
A. Make sure that the circuit breaker is on or fuse is
OK at the electrical panel.
B. Make sure that the service switch is ON.
C. Make sure that the Gas is ON at the:
• Gas meter
• All appropriate manual shutoff valves
• Gas control valve
D. Make sure that the thermostat is calling for heat.
E. Make sure that the wire connections at the
integrated boiler control and at the originating
control are securely plugged in or connected.
F. Check that the hoses are securely connected and
are not plugged or damaged.
Troubleshooting Tools:
2.
A. Voltmeter to check120 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 the pressure switch.
D. U-Tube Manometer or Differential Pressure Gauge
with 0-14" range (0.1" scale) for measuring inlet
and manifold gas pressures.
What Is The System Status?
3.
A. Consult the chart on the following page.
B. Figure #15
Indicator Lamps on the boiler.
33
shows the location of the Diagnostic