21
3. The differential pressure setpoint of the pressure
switch is not exceeded and the thermostat circuit
remains closed until the call for heat has ended.
Abnormal operation:
Start-up:
1. When the room thermostat calls for heat the
normally open contact W-R close and the burner
blower starts and creates suction in the intake
piping circuit and a pressure in the vent piping
circuit.
2. If there is a blockage in the intake or vent openings
to cause a pressure differential beyond the set point
of the pressure switch, then the thermostat circuit is
opened and the burner will go into a 2 minute post-
purge and then shut down.
3. After the post-purge, once the burner blower shuts
down, the pressure switch contacts will re-close. If
the call for heat remains, the burner will re-start. If
the blockage still exists, the thermostat is again
opened, and the burner post- purges again. The
post-purge function thus becomes an inherent anti-
short cycling device.
4. The unit will essentially go into a continuous re-
cycling post-purge mode with no heat being
supplied to the dwelling, which will prompt a call for
service to the equipment.
5. During the re-cycling post-purges, if the blockage of
the terminal is removed, the burner will immediately
fire up at the end of the current post purge cycle.
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 must 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. 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.
Always keep the supply valve shut off if the
burner is shut down for an extended period of
time.
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
Содержание OLR Series
Страница 29: ...DNS 0571 Rev B DNS 0573 Rev B 30 FIGURE 5 1 Model OLR105A12B FIGURE 5 2 Model OLR160B20B...
Страница 30: ...31 FIGURE 5 3 Model OUF105A12B FIGURE 5 4 Model OUF160B18 DNS 0568 Rev C DNS 0572 Rev C...
Страница 31: ...FIGURE 5 5 Model OLF105A12B DNS 0570 Rev B FIGURE 5 6 Model NOUF105A12B 32 DNS 0674 Rev C...
Страница 32: ...33 FIGURE 5 7 Model NOUF160B18B FIGURE 5 8 Model NOLF105A12B DNS 0676 Rev C DNS 0675 Rev D...