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!
WARNING:
Do not obstruct any return air open-
ings, including the grille on the fur-
nace. To do so may cause the furnace
to activate the high limit and shut down,
or it may cause asphyxiation.
18. MAINTENANCE
By Homeowner
1. Return Air - On some closet installations the
return air opening to the furnace may be on
the floor, on the door, on the side wall of the
closet, or some combination of these. The
upper grille on the front of the furnace admits
return air to the blower. Return air must be
provided back to the circulating blower in
order to provide air distribution.
2. Filters - At least twice each season (more
often in dusty areas) remove and clean the
air filters with a vacuum or with warm water
and soap. Reinstall when dry. Also clean
dust and lint around furnace and in the fur-
nace vestibule. (Figure 35.)
3. Seasonal Service Information - During ex-
tremely cold weather, ice may form on the
furnace roof jack. Small amounts of ice form-
ing on the roof jack will present no problems
to proper furnace operation. Excessive ice
formation could restrict the combustion air
supply to the burner, causing inefficient
burner operation. If excessive ice has formed
on the air inlet or exhaust portions of the roof
jack, it must be carefully removed (Figure
36).
By Serviceman
All furnaces need periodic service at the begin-
ning of each heating season. Call your service-
man to:
a. Remove the air circulator and clean all dust
and lint from the unit with a stiff bristle brush.
b. Inspect the combustion chamber blower
compartment, flue collar and Roof Jack.
c. Check the gas valve (if applicable) and fuel
line connections for leaks.
d. Make any adjustments necessary for good
operation.
!
WARNING:
Use of furnace or air conditioning com-
ponents that are not included in the
certification of this appliance may cre-
ate a hazard, invalidate the certifica-
tion, and in many states, make instal-
lations illegal. Listed NORDYNE air
conditioning components are speci-
fied on the furnace label.
ADDITIONAL OIL
FURNACE MAINTENANCE
In addition to the preceding, the following should
be performed by a qualified service contractor
at least once each season for oil-fired furnaces:
a. Replace the oil nozzle with the type nozzle
specified for your furnace.
b. Clean, adjust and replace if necessary the
spark electrodes.
c. Reset the nozzle/drawer assembly to fac-
tory specifications.
d. Clean the inside of the furnace heat ex-
changer and replace the combustion liner if
necessary.
e. Clean or replace the oil filter element at the oil
tank.
f. Adjust the burner for top efficiency and check
to make sure all fittings are leak-tight.
19. OPTIONAL ACCESSORIES
Necessary when the Furnace is Used with
Some Central Air Conditioners
If an air conditioner is installed that does not use
the furnace blower for air distribution and that
operates independently of the furnace, the
thermostat system must have an interlock to
prevent the furnace and air conditioner from
operating at the same time. This interlock sys-
tem usually contains either a “Heat-Cool” switch
which must be turned to the “Heat” or “Cool”
position to activate either heating or cooling
operation, or a positive “OFF” switch on the
cooling thermostat.
Figure 36. Roof Jack
Check for
Ice Here