Troubleshooting - Dunkirk 90-50 Installation, Operation & Maintenance Manual

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
n a reset from lockout condition, all electrical meter readings
1. I
at the gas control valve (24 vac) must be taken within the trial
for ignition period.
If any component does not function properly, make sure it is
2.
correctly installed and wired before replacing it.
Static electricity discharge can damage the integrated boiler
3.
control (IBC). Touch metal surface to discharge static
electricity before touching IBC.
The IBC cannot be repaired. If it malfunctions it must be
4.
replaced.
Only trained, experienced service technicians should service the
5.
IBC systems. Following troubleshooting, check out the system
following the sequence of operation section of this chapter for a
normal light off sequence.
All controls are factory tested in the assembly process and
6.
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.
It is extremely unlikely that the two consecutive controls are
7.
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
Before troubleshooting:
1.
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
connected.
F. Check that hoses are securely connected and are not
plugged in or damaged.

TroublesHooTing

WARNING
Troubleshooting tools:
2.
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 pressures.
What is system status?
3.
A. Consult the chart on the following page.
B. shows the location on the boiler of the
Figure #16
diagnostic indicator lamps.
47