Independence Installation, Operating, and Service Instructions
40
103538-08 - 3/18
b. Flame current must be measured with pilot
valve open/pilot lit but the main valve closed.
c. Disconnect MV lead wire from the module
before measuring ame current. Trying to
measure the pilot ame current in series with the
wiring will not yield the accurate reading.
d. The minimum steady pilot ame signal must
be 1 μAmp (microampere) DC (direct current).
e. For reliable operation the ame current should
be 2 μAmp or greater.
f. To ensure adequate ame current:
i. Turn off boiler power at circuit breaker or
fuse box
ii. Clean the ame rod with emery cloth if
required
iii. Make sure electrical connections are clean
and tight, and wiring not damaged, repair/
replace as needed
iv. Check for igniter/sensor cracked ceramic
insulator, replace if needed
v. Check the pilot ame. It must be blue,
steady and envelop the ame sensing rod
3/8” to ½”.
vi. If needed, adjust pilot ame by turning the
gas valve pilot adjustment screw clockwise
to decrease or counterclockwise to increase
pilot ame. Always reinstall pilot adjustment
Figure 41B: Measuring Pilot Flame
Current with Micro-ammeter
screw cover and tighten securely upon
completion to assure proper gas valve
operation.
g. Reconnect MV lead wire to the module upon
satisfactory completion of pilot ame current
measurement.
h. Check the pilot burner operation/ignition
sequence during ignition cycle:
i. Restore boiler power at circuit breaker or
fuse box
ii. Set thermostat to call for heat
iii. Watch ignition sequence at burner
iv. If spark does not stop after pilot lights,
replace ignition module
v. If main burners do not light or if main
burners light but system locks out, check the
module ground wire and gas control as
described in “ Honeywell Electronic Ignition
Troubleshooting Guide” located in Section
X " Service Instructions".
F. Check pilot burner ame and main burner ames
through observation port.
1. Check pilot ame.
a. Continuous Ignition (Standing Pilot), Models
IN10 through IN12. See Figure 42. Pilot burner
produces three (3) ames. Center ame should
be steady, medium hard blue enveloping 3/8 to ½
inch of thermocouple.
b. Electronic Ignition (EI), Models IN3I through
IN12. See Figure 43. Pilot should be lit only
after completing Step 3. Pilot burner produces
three (3) ames. Center ame should be steady,
medium hard blue enveloping 3/8 to ½ inch of
sensing probe.
CAUTION
Avoid operating this boiler in an environment
where saw dust, loose insulation bers, dry wall
dust, etc. are present. If boiler is operated under
these conditions, the burner interior and ports
must be cleaned and inspected daily to insure
proper operation.
2. Adjust thermostat to highest setting.
3. Check main burner ames. See Figure 44 or 45.
Flame should have clearly dened inner cones with
no yellow tipping. Orange-yellow streaks caused by
dust should not be confused with true yellow
tipping.
4. Adjust thermostat to normal setting.
IX. System Start-up (continued)