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2.
Place thermometer in return air duct about two feet from
furnace, with the tip of the thermometer as near as possi-
ble to the center of the duct.
3.
Set thermostat to highest temperature setting and allow
furnace to run for at least five minutes before checking
temperatures.
4.
Calculate air temperature rise by subtracting supply air
temperature from the return air temperature.
5.
If temperature rise is not within the range shown on the
furnace rating plate, the blower speed may need to be
changed.
6.
If the blower speed is changed, recheck the temperature
rise by repeating steps 1 through 4 above.
7.
If the air temperature rise is not within the proper range
even after changing blower speeds, check ductwork
design with a qualified heating engineer. It may be nec-
essary to re-size the ductwork.
BALANCE THE SYSTEM
The air distribution system should be balanced, using in-line
duct dampers if employed, to provide for satisfactory air deliv-
ery to room. It is recommended that dampers in registers not
be used for balancing the system.
SERVICE INSTRUCTIONS
Never attempt to modify this furnace - fire, explo-
sion, or asphyxiation may result. If malfunction is
apparent, contact a qualified service agency and/
or gas utility for assistance.
Label all wires prior to disconnection when ser-
vicing controls. Wiring errors can cause improper
and dangerous operation.
Verify proper operation after servicing.
MOTOR LUBRICATION
The circulating air blower motor and vent blower are perma-
nently lubricated and do not require periodic lubrication.
22
BURNER CLEANING
The burners used in this furnace are specially designed to be
non-linting and should not require periodic cleaning. In the
event that cleaning does become necessary, use the suction
hose of a suitable vacuum cleaner to remove dirt and lint. Be
careful not to damage the ignitor or sensor rod during clean-
ing.
FLUE GAS PASSAGEWAYS
Periodic cleaning of the heat exchanger and flue gas pas-
sageways is not necessary and is not recommended under
normal circumstances.
REPLACEMENT PARTS
Should it be necessary to replace any component parts,
these may be obtained through an authorized dealer, who is
experienced and can be of assistance. Information on the
nearest Distributor may be obtained directly from the com-
pany shown on the furnace rating plate.
Only genuine Source One authorized replace-
ment parts should be used. Substitute parts
should not be used, as they may not be the same
in operational and safety characteristics.
Following major service or replacement of functional parts, it
is recommended that the furnace be operated in the various
modes to insure that performance is normal and control com-
ponents are functioning properly.
The parts listed below are only those that are functional parts
and those that might require replacement. The parts listed
are by part name (description) only and CODE reference
NUMBER. The CODE number is used to determine the loca-
tion of the part in the generalized, pictorial illustration pro-
vided. See Figure 16.
When ordering parts - order by name and description. Do not
order by code number. Also when ordering parts please pro-
vide:
1.
Complete furnace Model Number and Serial Number.
These may be found on the rating plate located behind
the front panel (door) of the furnace.
2.
Type of gas being used.
3.
Is furnace being used in conjunction with air conditioning
or heat pump?
035-15241-003 Rev. A (201)
Unitary Products Group
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