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Do not attempt to modify the characteristics of
this boiler in any way!! Fire, explosion, or risk
of shock hazard may cause property damage,
severe injury, or death.
IMPORTANT
If any component does not function properly,
1.
make sure it is correctly installed and wired be-
fore replacing it.
Static electricity discharge can damage the
2.
integrated modulating boiler control (IMBC).
Touch metal surface to discharge static elec-
tricity before touching control.
The boiler control cannot be repaired.
3.
functions it must be replaced.
Only trained, experienced service technicians
4.
should service the boiler control systems. After
troubleshooting, follow the "Detailed Sequence
of Operation" in this manual for a normal light
off procedure.
5.
All controls are factory tested in the assem-
bly process and a defective control is gener-
ally the least likely cause. if you suspect you
have a defective boiler control, read through
the "Troubleshooting" section of this manual
before you replace it.
It is extremely unlikely that the two consecutive
6.
controls are defective. If it seems to be hap-
pening, chances are that either there is noth-
ing wrong with the control or it is being dam-
aged by some other problem (for example, an
electrical short burning out a transformer).
VII- SERVICE HINTS
WARNING
If it mal-
TROUBLESHOOTING TOOLS
Have the following tools available prior to troubleshooting
your boiler:
•
Voltmeter that can check 120 VAC, 24 VAC, and 12
VdC
•
Continuity tester
•
Contact Thermometer
•
Inclined Manometer or Pressure Gauge with 0-6.0" range
(0.01" scale) for measuring suction pressures at pres-
sure switch
•
U-Tube Manometer or Differential Pressure Gauge with
0-14" range (0.1" scale) for measuring inlet and manifold
gas pressures
INITIAL SERVICE CHECKS
Prior to troubleshooting:
Make sure that circuit breaker is on or fuse is okay at
1.
electrical panel.
2.
make sure that service switch is on.
Check for 120 VAC (minimum 102 VAC to maximum 132
3.
VAC) to boiler.
Make sure thermostat is calling for heat and contacts (in-
4.
cluding appropriate zone controls) are closed. Check for
24 VAC between thermostat wire nuts and ground.
Make sure all external limit controls are either installed
5.
(and closed) or temporarily jumpered for testing.
Make sure that gas is on at the gas meter, at all appropri-
6.
ate manual shutoff valves, and at the gas control valve.
Gas pressures should be a maximum of 10" w.c. (natu-
ral gas) or 14" w.c. (for LP gas) with no flow (lockup) or
with boiler on and a minimum of 5" w.c. with gas flowing
(verify during boiler startup with boiler at high fire).
Check that wire connectors at the boiler control and at
7.
the originating control are securely plugged in or con-
nected.
8.
Check that all hoses are securely connected and are not
plugged in or damaged.
13
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