8
5. Be sure that the return air duct connections are physically
sound, are sealed to the furnace casing and terminate out-
side the space containing the furnace.
6. Be sure the physical support of the furnace is sound, without
sags, cracks, etc., around the base so as to provide a seal
between the support and the base.
7. Look for obvious signs of deterioration of the furnace.
8. If the furnace is free of the above conditions, replace the ac-
cess doors and restore electrical power to the furnace.
9. Start the furnace and observe its operation. Watch the burner
flames to see if they are bright blue. If a suspected malfunc-
tion is observed, or the burner flames are not bright blue,
apply appropriate service.
CONDENSATE
NOTE: This furnace is equipped with a pressure switch which will
shut off the main burners if the condensate drain line becomes
blocked.
Be sure this condensate drain line does not become blocked or
plugged. Visual inspection of condensate flow can easily be
made while the furnace is in operation. A flashlight can be used to
illuminate the discharge end placed in the sewer openings.
Clean and flush the condensate tube to make sure condensate
flows freely while the furnace is in operation.
If a means to neutralize the condensate has been provided for
the furnace, be sure to follow the maintenance schedule fur-
nished by the manufacturer.
MAINTENANCE (cont.)
!
WARNING
CHECK VENT PIPE SECTIONS FOR DETERIORATION
AND CHECK JOINT FITTINGS FOR THEIR INTEGRITY. IF
IT HAS BECOME DISCONNECTED OR TOXIC FUMES CAN
ESCAPE INTO THE HOME AND CAUSE CARBON MONOX-
IDE POISONING OR DEATH. DO NOT OPERATE THIS
FURNACE. APPROPRIATE SERVICE MUST BE APPLIED.
Mai
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enanc
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