Testing the Ignition Safety
Shut-off
The ignition system safety shut-off must be tested by
conducting the following tests:
1. Turn on power to the ignition systems and turn gas
supply off at the gas valve.
2. Check ignition module as follows:
a. Set the thermostat or controller above room
temperature to call for heat.
b. Watch for continuous spark at the pilot burner.
c. Time the spark operation. Time must be with-
in the lockout timing period (15 or 90
seconds).
d. Turn thermostat down to end call for heat and
wait 60 seconds on lockout models before
beginning step 3.
3. Turn on gas supply.
4. Set thermostat or controller above room tempera-
ture to call for heat.
5. Systems should start as follows:
a. Spark will turn on and pilot gas valve will open
at once. Pilot burner should ignite after gas
reaches the pilot burner.
b. Spark ignition should cut-off when pilot flame
is established.
c. Main gas valve should open and main burner
should ignite after gas reaches the burner
port.
Safe Shut-down Tests
Limit Action
With the burner operating, lower the high limit setting
to simulate an overheated boiler. Normal shutdown
should occur. Restore the normal limit setting, and the
burner should restart.
Flame Failure
With burner operating, close the manual fuel valves to
simulate a flame failure. System should lock out after
safety switch timing (15 seconds). After the safety
switch has cooled, open the manual valves (relight
standing pilots) and reset the safety switch; the burn-
er should restart.
Inspection Procedures
Burners
Clean main burners and air louvers of dust, lint and
debris. Keep boiler area clear and free from com-
bustibles and flammable liquids. Do not obstruct the
flow of combustion and ventilation air. Make visual
check of burner and pilot flame. Yellow flame indicates
clogging of air openings. Lifting or blowing flame indi-
cates high gas pressure. Low flame indicates low gas
pressure.
Inspection Schedule
To be performed the first and third month after initial
start up and then on an annual basis. If problems are
found, refer to Troubleshooting Guide for additional
directions.
1. Remove top of boiler and inspect heat exchanger
for soot and examine venting system.
2. Remove rear header and inspect for scale
deposits.
*3. Inspect pilot and main burner flame and firing rate.
*4. Inspect and operate all controls and gas valve.
*5. Visually inspect system for water leaks.
*6. Inspect oil pump motor and bearing assembly, if oil
cups are provided.
7. Check flow switch paddle.
8. Clean room air intake openings to ensure ade-
quate flow of combustion and ventilation air.
9. Keep boiler area clear and free from combustible
materials, gasoline, and other flammable vapors
and liquids.
*Should be checked monthly. (Takes approximately 15
minutes).
Procedure for Cleaning Flue Gas
Passageways
Soot will clog areas behind fins and eventually cause
tube failure. Any sign of soot at base of burners or
around outer jacket indicates a need for cleaning.
1. Lift off drafthood and flue collector by removing
bolts and screws.
NOTE: Modulating burner flame varies in height from approximately
1/4" at low fire to approximately 4" in high fire.
Fig. 30: Main Burner Flame
29
Summary of Contents for 0042B
Page 14: ...VENT DAMPER 14 ...
Page 20: ...Wiring Diagrams 20 ...
Page 21: ...21 ...
Page 24: ...Fig 23 Power Vent System with Zone Valve Taco 24 ...
Page 25: ...25 Fig 23 Power Vent System with Zone Valve Honeywell ...
