TriangleTube Prestige Excellence Part 1 - Manual (Page 67)

Check Flame Signal
The flame signal should be a min. 3μ Α −DC.
Check the ignitor for fouling or damaged
insulation if a low flame signal is read.
Check ground wiring and continuity as a cause
for low flame signal. Replace ignitor if condi-
tions are satisfactory.
Check Combustion Levels
Refer to page 38 of this manual for measuring
combustion levels and burner adjustments.
Check Flue Gas Temperature
1. Adjust the boiler to fire at HIGH fire, see
page 42. Place the control display to INFOR-
MATION mode, see page 44 for procedures.
2. The flue gas temperature is indicated on
the display when the first digit is 5. The
measured temperature (shown as the last 3
digits) should not be more than 54ºF high-
er than the measured supply water temper-
ature.
3. The measured supply water temperature is
indicated on the information display when
the first digit is 1 and the temperature
shown as the last 3 digits.
4. If the measured flue gas temperature is
higher than 54ºF over the supply water
temperature, shut the boiler down and fol-
low the procedures listed below to clean
the heat exchanger.
Clean Heat Exchanger
1. Shut down the boiler:
- Follow the instructions on page 39 "To
Turn Off Gas to Appliance"
- Do not drain the boiler unless the boil-
er will be subject to freezing condi-
tions.
- Do not drain the boiler if freeze protec-
tion fluid is used in the system.
2. Allow the boiler to cool down to room tem-
perature before servicing.
3. Disconnect the gas piping and rectifier
plug to the gas valve.
4. Disconnect the wiring harness connectors
from the blower and remove the blower
retaining screws. Remove the blower from
the unit.
5. Remove the mounting nuts securing the
burner mounting plate to the heat exchang-
er and set aside.
6. Carefully remove the burner mounting
plate assembly from the heat exchanger.
Ensure combustion chamber insulation is
not damaged during removal of burner
mounting plate assembly. See WARNING
on page 61.
7. Carefully remove the combustion chamber
insulation from the heat exchanger and set
aside. See WARNING on page 61.
8. Use a vacuum cleaner, compressed air or
water to remove any accumulation from
the heat exchanger flue ways. Do not use
any solvent.
9. Re-install the combustion chamber insula-
tion onto the heat exchanger.
10. Re-assemble the burner mounting plate
assembly onto the heat exchanger. Ensure
the burner plate gasket and combustion
chamber insulation is in place and not dam-
aged, replace gasket and insulation if nec-
essary. See WARNING on page 61.
11. Re-assemble the blower onto the burner
mounting plate and reconnect the wiring
harness connectors.
12. Reconnect the gas piping and rectifier to
gas valve. Check for gas leaks, repair if
necessary.
13. Close isolation valves on the boiler water
piping to isolate the boiler from the heating
system.
Maintenance Procedures
60