Dettson AMT400B34-SM1PMA, Installation Instructions And Homeowner'S Manual

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11
4 MAINTENANCE
WARNING
Electrical shock hazard.
Turn OFF power and fuel to the furnace before any
disassembly or servicing.
Failure to do so can result in death, bodily injury and/or
property damage.
Preventive maintenance is the best way to avoid unnecessary
expense and inconvenience. Have your heating system and
burner inspected by a qualified service technician at regular
intervals.
To maintain the reliability and optimal performance of the
furnace, have a complete combustion check done after the
annual maintenance call. Do not attempt to repair the furnace
or its controls. Call a qualified service technician.
Before calling for repair service check the following points:
1. Check the oil tank gauge and make sure that the valve is
open;
2. Check fuses and the circuit breaker;
3. Check if the main disconnect switch is ON ;
4. Set the thermostat above room temperature;
5. If ignition does not occur, turn off the disconnect switch
and call a qualified service technician.
When ordering replacement parts, please specify the
complete furnace model number and serial number.
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 1, p. 14.
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.