31
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DETAILED SEQUENCE OF OPERATION
WARNING
Fire, explosion, or shock hazard. May cause property damage, severe injury, or death. Do not
attempt to modify the physical or electrical characteristics of this boiler in any way.
IMPORTANT
1. In a reset from lockout condition, all electri-
cal 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 be-
fore replacing it.
3. Static electricity discharge can damage the Inte-
grated 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. See the chart
on the previous page titled
“End of Normal Se-
quence of Operation”
for a normal light-off se-
quence.
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 de-
fective control, read through Section XVI,
“Trou-
bleshooting,”
before you replace it.
7. It is extremely unlikely that two consecutive
controls are defective. If it seems to be hap-
pening, chances are that either there is nothing
wrong with the control or it is being damaged by
some other problem (for example, an electrical
short burning out a transformer.)
INITIAL SERVICE CHECKS
1. Before troubleshooting:
a. Make sure that circuit breaker is on or
fuse is okay ay electrical panel.
b. Make sure that service switch is on.
c. Make sure that gas is on at the gas me-
ter, 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 Integrat-
ed Boiler Control and at the originating con-
trol are securely plugged in or connected.
f. Check that hoses are securely connected
and are not plugged or damaged.
2. Troubleshooting Tools:
a. Voltmeter to check 120 VAC and 24
VAC.
b. Continuity Tester.
c. Inclined Manometer or Pressure Gauge
with 0-4.0” range (0.01” scale) for measur-
ing suction pressures at 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 System Status?
A. Consult the
“System Status”
chart in Sex-
tion XVI,
“Troubleshooting.”
B. Refer to Figure 16 in Section XI of this
manual for the location of the diagnostic in-
dicator lamps on the boiler.
SERVICE HINTS
