Troubleshooting - Dunkirk Q90-125 Installation, Operation & Maintenance Manual

WARNING
!
Fire, explosion or shock hazard may cause death or
serious injury. Do not attempt to modify physical or
electrical characteristics of this boiler in any way.
• In reset from lockout condition, all electrical meter
readings at gas control valve (24 vac) must be taken
within trial for ignition period.
• If any component dose not function properly, make
sure it is correctly installed and wired before replacing.
• Static electricity discharge can damage integrated
boiler control (IBC). Touch metal surface to discharge
static electricity before touching IBC.
• IBC cannot be repaired. If it malfunctions it must be
replaced.
• Only trained, experienced service technicians should
service IBC systems. Follow troubleshooting to check
out system and sequence of operation for normal light
off sequence.
• Defective control is least likely cause of malfunction.
If you suspect unit has defective control, read through
troubleshooting chart before replacing it.
• It is unlikely two consecutive controls are defective. If
this seems to be the case chances are the controls are
not the cause but rather malfunction is due to some
other problem such as electrical short burning out
transformer.

15 - TROUBLESHOOTING

Initial Service Checks
1. Before Troubleshooting:
A. Verify circuit breaker is on or fuse is OK at electrical
B. Verify service switch is ON.
C. Verify Gas is ON at:
• Gas meter
• Appropriate manual shutoff valves
• Gas control valve
D. Verify thermostat is calling for heat.
E. Verify wire connections at integrated boiler control
F. Check hoses are securely connected and are not
2. Troubleshooting Tools:
A. Voltmeter to verify 120 VAC and 24 VAC
B. Continuity Tester
C. Inclined Manometer or Pressure Gauge with 0-2.0"
D. U-Tube Manometer or Differential Pressure Gauge
System Status:
3.
A. Consult "System Status" on page 35.
B. See Figure 19, Page 20, for location of boiler
33
panel.
(IBC) and originating control are securely plugged
in or connected.
plugged or damaged.
range (0.01" scale) for measuring suction pressures
at pressure switch.
with 0-14" range (0.1" scale) for measuring inlet
and manifold gas pressures.
Diagnostic Indicator Lamps.