Blower Removal; Blocked Vent Shut Off (Bvso); Cleaning - Carrier CBLAAA060120 Installation Instructions Manual

If cleaning
followed:
1.
2.
3.
4.
is necessary, the following stepsshouldbe
Turn "OFF" all power upstream from the furnace;
Disconnect the flue pipe and breach plate;
Remove the radiator baffle;
Disconnect the oil line and remove the oil burner from
the furnace;
5. Clean the secondary tubes and the primary cylinder with
a stiff brush and remove debris with a vacuum cleaner;
6. Before reassembling the furnace, the heat exchanger
and combustion chamber should be inspected to
determine if replacement is required;
7. After cleaning, replace the radiator baffle, flue collar
plate and oil burner;
8. Readjust burner for proper operation.
4.2 BLOWER REMOVAL
To remove the blower from the furnace:
1. Turn "OFF" all power upstream from the furnace;
2. Remove blower access door;
3. Remove the 4 blower retaining wing-nuts;
4. Slide the blower on the rails toward the rear of the unit;
5. Reverse the above steps to reinstall the blower. (Refer
to wiring diagram Figures 6, 7 and 8 of this instruction
manual or the diagram located on the inside of the
blower door to properly rewire the unit.
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.
13