Carrier OBL098, Installation Instructions Manual

 11

4.1 

CLEANING THE HEAT EXCHANGER 

It is not generally necessary to clean the heat exchanger or 
flue pipe every year, but it is advisable to have the oil burner 
service technician check the unit before each heating season 
to determine whether the cleaning or replacement of parts is 
necessary.  

If a cleaning is necessary, the following steps should be 
performed:  
1.  Turn OFF all utilities upstream from the furnace; 

2.  Disconnect the flue pipe; 

3.  Remove the flue collar panel located at the rear of the 

furnace; 

4.  Remove the clean-out door located at the front of the 

furnace; 

5.  Remove the heat exchanger baffles; 

6.  Disconnect the oil line and remove the oil burner; 

7.  Clean the secondary tubes and the primary cylinder with a 

stiff brush and a vacuum cleaner; 

8.  Before re-assembling the unit, the heat exchanger and 

combustion chamber should be inspected to determine if 
replacement is required; 

9.  After the cleaning replace the heat exchanger baffles, flue 

collar plate and oil burner; 

10.  Readjust the burner for proper operation. 

4.2 

CLEANING THE BLOCKED VENT 
SHUT-OFF DEVICE (BVSO) 

For continuous safe operation, the Blocked Vent Shut-off device 
(BVSO) must be inspected and maintained annually by a 
qualified service technician. 

1.  Disconnect power to the appliance; 

2.  Remove the two screws holding on the BVSO assembly 

cover; 

3.  Remove the cover; 

4.  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 from the heat transfer 
tube assembly; 

5.  Carefully remove any build-up from the thermal switch 

surface; 

CAUTION

Do not dent or scratch the surface of the thermal switch. If the 
thermal switch is damaged it MUST be replaced. 

6.  Clean and remove any build-up or obstruction inside the 

heat transfer tube; 

7.  Re-mount, lock and fasten the control box with the 2 screws 

removed in step 4; 

8.  Re-attach the assembly cover with the screws removed in 

step 2; 

9.  Re-establish power to the unit. 

4.3 

CLEANING OF THE BURNER HEAD 

Once annually, remove the retention head and electrodes 
from the drawer assembly and remove all foreign matter, if 
necessary. Also clean the extremity of the burner tube, if 
necessary. 

4.4 

REPLACING THE NOZZLE  

Replace the nozzle once a year with the one specified in 
Table 7. 

4.5 

REPLACING THE OIL FILTER  

Tank Filter 

The tank filter should be replaced as required. Follow the 
manufacturer’s instructions. 

Secondary Filter  

The 10 micron, or finer, filter cartridge should be replaced 
annually. Follow the manufacturer’s instructions. 

4.6 

REPLACING THE AIR FILTER  

Dirty filters have an impact on the efficiency of the furnace 
and increase fuel consumption. 
 
Air filters should be replaced at least once a year. Very 
dusty conditions, the presence of animal hair and the like 
will require more frequent changing or cleaning.