Table of Contents
Advertisement
Available languages
Available languages
During operation:
If the terminal vent or intake openings become blocked to the point
where the set point of the pressure switch is exceeded, during a firing
cycle, the burner flame will shut down and the burner will go into the
indefinite recycling post-purge mode as described above, until the
blockage is removed.
3)
CHECKS AND ADJUSTMENTS
3.1)
General:
During initial start-up and subsequent yearly maintenance calls, the
furnace mu st be thoroughly tested.
Open the oil bleed port screw and start the burner. Allow the oil to
flush into a portable container for at least 10 seconds. Slowly close the
bleed screw - the oil should flow absolutely free of white streaks or
bubbles to indicate that no air is being drawn into the suction side of
the oil piping and pump. Tighten the bleed screw and the burner will
fire. Adjust the oil pressure as indicated in Table #4.1 to #4.3.
IMPORTANT
The burner must be put in operation for at least 10
minutes before any test readings are taken. For new
installations, set up the burner to the settings (see table
#4.1 to 4.3), before firing. These are rough adjustments
but they will ensure that the burner will start and run
smoke-free in advance of the fine adjustments being
made.
3.2)
Restart if Burner Should Stop:
1.
Set thermostat lower than the room temperature.
2.
Press the reset button on the burner primary control (relay).
3.
With side-wall venting and Riello burner, set thermostat higher
than the room temperature for 10 seconds and set lower than
room temperature. This will start pre purge cycle. Repeat twice.
4.
Set thermostat higher than the room temperature.
5.
If the burner motor does not start or ignition fails, turn off the
disconnect switch and CALL YOUR SERVICEMAN
CAUTION
Do not attempt to start the burner when excess oil has
accumulated, when the furnace is full of vapour, or
when the combustion chamber is very hot.
3.3)
Combustion chamber curing:
Some moisture and binders remain in the ceramic combustion
chambers after fabrication. It is important to clear the chamber of
these residues before testing. If you smoke test before curing, the
instrument may become damaged. To cure the chamber, run the unit
for 3 consecutive cycles, with 3 minutes of elapsed time in between
each cycle. Each burn cycle should be 3 minutes duration. The
exhaust will have a pungent odor and produce a white cloud of steam.
3.4)
Perform the smoke / CO2 test:
1.
For chimney installations, pierce a test hole in the smoke pipe
near the furnace breech. For side-wall vented installations,
remove the threaded cap from the extended test pipe that is
welded into 4-bolt breech plate. Insert the smoke test instrument
probe into the open hole.
2.
Starting with a zero smoke reading, gradually reduce the burner
air setting until just a trace (#1 on Bacharach Scale) of smoke
results.
3.
Take a CO2 sample at the same test location where the smoke
sample was taken. Note the CO2 reading associated with the #1
smoke condition.
4.
For chimney vented installations, adjust the burner air setting to
obtain a CO2 reading 1% lower than the reading associated with
the #1 smoke.
5.
For side-wall vented installations, adjust the burner air setting to
obtain a CO2 reading 1.5% lower than the reading associated
with the #1 smoke.
6.
This method of adjusting the CO2 will allow adequate excess air
to ensure that the burner will burn clean for the entire heating
season, and will ensure proper calibration of the DV -2000™
blocked intake/ vent safety shutdown system used in side-wall
venting applications.
3.5)
Perform the supply air temperature rise test:
1.
Operate the burner for at least 10 minutes.
2.
Measure the temperature of the air in the return air plenum.
3.
Measure the temperature of the air in the largest trunk coming off
the supply air plenum, just "out of the line of sight" of the radiation
coming off the heat exchanger; 12" away from the plenum on the
main take-off usually satisfies this objective.
4.
The temperature rise is calculated by subtracting the return air
temperature from the supply air temperature.
5.
If the temperature rise exceeds the temperature specified in table
#4.1 to #4.3, change to the next higher blower speed tap until the
temperature rise falls to at this temperature or below. If the
excessive temperature rise cannot be reduced by increasing fan
speed, investigate for ductwork restriction(s), dirty or improper air
filter, or overfiring caused by excessive pump pressure, or
inproper nozzle sizing.
3.6)
Vent temperature test:
1.
Place a therm ometer in the test hole located in the breech pipe.
2.
The vent temperature should be between 400 and 575°F. If
not, check for improper air temperature rise, pump pressure,
nozzle size, or for a badly sooted heat exchanger.
17
Hide quick links:
Advertisement
Table of Contents
