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2.
When the call for heat is satisfied, the thermostat
contacts open and the furnace blower stop after a
period of 3 minutes.
3.5.5
Defrost Mode
When the R - W and R - Y/Y2 circuits are closed by the
thermostat and the heat pump, the electronic control starts-
up the burner and the blower in the oil heating mode during
defrosts.
3.6
LIMIT CONTROL CHECK
After the furnace has been in operation for at least 15
minutes, restrict the return air supply by blocking the filters
or closing the return registers and allow the furnace to shut
down on High Limit. The burner will shut OFF but the main
blower should continue to run.
Remove the restriction and the burner should come back on
in a few minutes.
4.0
MAINTENANCE
WARNING
Before performing any service functions, make sure that
all utilities are turned ''OFF'' upstream from the
appliance, unless operations specifically require the
power to be on. Failure to comply with this warning will
cause a fire hazard and/or bodily harm.
This furnace should never be operated without an air filter.
Disposable filters should be replaced at least once a year. If
equipped to provide cooling, filters should be replaced at a
minimum of twice a year.
To avoid personal injury, make sure the power is "OFF"
before servicing.
ALWAYS KEEP THE OIL VALVE CLOSED IF THE
BURNER IS SHUT DOWN FOR AN EXTENDED PERIOD
OF TIME.
For optimum performance, the oil burner nozzle should be
replaced at least once a year.
The procedure for the installation and/or replacement of a
nozzle is outlined in the oil burner instruction manual which
is supplied with the furnace.
After replacing the nozzle, the burner should be adjusted in
accordance with the "COMBUSTION CHECK" section of this
manual.
4.1
HEAT EXCHANGER CLEANING
Normally, it is not necessary to clean the heat exchanger or
flue pipe every year, but it is advisable to have a qualified
service technician check the unit before each heating
season to determine whether cleaning or replacement of
parts is required.
If cleaning is necessary, the following steps should be taken:
1.
Turn "OFF" all utilities upstream from the furnace;
2.
Disconnect the flue pipe (only with chimney venting and
rigid flue pipe);
3.
Remove the breech plate;
4.
Remove the radiator baffle;
5.
Disconnect the oil line and remove the oil burner from
the furnace;
6.
Open the two cleanout doors located in the upper part
of the front panel of the furnace;
7.
Clean the secondary tubes and the primary cylinder
with a stiff brush and a vacuum cleaner;
8.
Before reassembly, the heat exchanger and combustion
chamber
should
replacement is required;
9.
After cleaning, replace the radiator baffle, flue collar
plate, oil burner and close the two clean out access
doors. Reconnect the flue pipe and oil line;
10. Readjust burner for proper operation.
4.2
BLOWER REMOVAL
To remove the blower from the furnace:
1.
Turn "OFF" all utilities upstream from the furnace;
2.
Remove the burner access door and blower door;
3.
Remove the blower retaining screw (on the blower
partition panel);
4.
Remove the control box cover and disconnect the
thermostat and power wires from the board;
5.
Slide the blower on the rails toward the front of the unit;
6.
Reverse the above steps to reinstall the blower. Please
refer to the wiring diagram, Figure 13 in this manual, or
the diagram located on the inside of the blower door to
properly rewire the unit.
Be sure that the blower is adequately supported when
sliding it off the mounting rails, especially in the
horizontal or counter flow positions, in order to prevent
dropping it and injuring yourself or damaging the
blower.
4.3
BLOCKED VENT SHUT OFF (BVSO) CLEANING
For continued safe operation, the Blocked Vent Shut-Off
System (BVSO) needs to be inspected and maintained
annually by a qualified service technician.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect electrical power supply to the furnace
before servicing the blocked vent shut-off.
1.
Remove the two screws holding down the BVSO
assembly cover;
14
be
inspected
to
determine
CAUTION
WARNING
if
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