Flame Sensor ("Cad Cell") Checkout Procedure; Replacement Parts; Maintenance; Air Filter(S) - Thermo Products Spirit Series Installation, Operation And Service Manual

NOTICE: If the high limit control is faulty, it should be replaced. However, it must
only be replaced by the same make and model as the original. Refer to the
electrical diagrams for proper electrical connections.

Flame Sensor ("Cad Cell") Checkout Procedure

Refer to the oil burner manufacturer's operating instructions (included with the furnace)
for detailed cad cell troubleshooting.

Replacement Parts

Appendix D of this manual contains a list of replacement parts available for these
furnaces.

MAINTENANCE

Air Filter(s)

c CAUTION: To avoid injury from moving parts, hot surfaces, or electrical shock,
shut off the power to the furnace and allow the furnace to cool BEFORE removing
any furnace access doors to service air filters.
The filter rack will be located between the return air plenum and the return air opening on
the side of the furnace, refer to figure 2. Slide the dirty filter out; clean it with a mild soap
and water solution. Make sure filter is thoroughly dry before replacing.
If the furnace, or duct system, is equipped with disposable-type (paper element), air
filters, inspect them every month for an excessive accumulation of dust and dirt. Replace
disposable air filters at least twice a year. Make certain the replacement filter is the same
size as the one being replaced. The filter size is marked on the outer edge of the air filter.
Install the filter with the arrow marked on the filter pointing toward the furnace.
Fig. 2: Location of the air filter on the typical highboy furnace.
18