Troubleshooting - UTICA BOILERS UB90125 Installation, Operation And Maintanance Manual

Fire, Explosion or Shock Hazard may cause Property Damage, Sever
injury or Death. do not attEMpt to ModIFY tHE pHYsIcal oR
ElEctRIcal cHaRactERIstIcs oF tHIs BoIlER In anY WaY.
1. 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.
2. If any component dose 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, by following the
Troubleshooting, Check Out The System and the Sequence Of Operation section of this chapter
for the normal Light Off Sequence.
6. 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.
7. 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.
1. Before troubleshooting:
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
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.
2. troubleshooting tools:
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 suc-
tion pressures at the pressure switch.
D. U-Tube Manometer or Differential Pressure Gauge with 0-14" range (0.1" scale) for mea-
suring inlet and manifold gas pressures.
3. What Is the system status?
A. Consult the chart on the following page.
B. Figure #15 shows the location of the Diagnostic Indicator Lamps on the boiler.

troUBlesHootiNg

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!
iMPortaNt
InItIal sERVIcE cHEcKs
• All appropriate manual shutoff valves
DANGER
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• Gas control valve
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