Heat Exchanger Cleaning; Blower Removal - CAC / BDP CBMAAA Installation Instructions Manual

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 cIeanout 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 reassembty, the heat exchanger and combustion
chamber should be inspected to determine if
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 diagrams, Figures 12 and 13 in this
manual, or the diagram located on the inside of the
blower door to properly rewire the unit.
I 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;
2. Remove the cover;
3. Remove the two screws holding the control box to the
heat transfer tube assembly. Sliding the control box in the
appropriate direction will unlock it form the heat transfer
tube assembly;
4. Carefully remove any build-up from the thermal switch
surface;
Do not dent or scratch the surface of the thermal
switch. If the thermal switch is damaged, it must be
replaced.
5. Clear and remove any build-up or obstruction inside the
heat transfer tube;
6. Re-mount, lock and fasten the control box with the 2
screws removed in step 3;
7. Re-attach the assembly cover with the screws removed in
step 1;
8. Re-establish power to the appliance.
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