All installations and services must be performed by qualified service personnel.
A. ELECTRICAL:
1. Check diagnostic code through view port prior to removing access door.
2. Check all wiring for loose connections and any signs of damage or unusual
wear.
3. Check for correct voltage at the furnace when operating.
4. Check amp-draw on blower motor and inducer motor to assure they are not
exceeding name plate amp rating.
5. Check for correct operation and proper settings (if manually adjustable) of all
controls.
Shut off gas and disconnect power before continuing.
B. GENERAL INSPECTION
1. VENT PIPE COMBUSTION AIR INTAKE
a. Remove the vent and check the vent for signs of carbon build-up and for
signs of blockage.
b. The entire length of vent and combustion air inlet pipe and their
terminations should be inspected for restrictions, loose or loosely sealed
joints, carbon build-up. Also inspect the outside vent and combustion air
terminals and ensure that they are clear and unobstructed.
2. CONDENSATE LINE/TRAP ASSEMBLY
The condensate line must be inspected to make sure it is not blocked. All of the
lines should be flushed with water to remove any build-up of sediment.
3. BURNERS
If it appears that material is accumulating in the burner box, the burner box cover
can be removed and the box and burners can be vacuumed. (NOTE: The igniter
& flame sensor must be removed before removing the assembly.) If necessary,
the burners assembly can be removed by taking out the two screws/one on each
bracket on the bottom of the box on CMA’s or on top of the box and removing the
burner drawer
assembly. Assembly must be pulled & tilted away from the blower
compartment in order to remove from box. If necessary, the individual tubes can
be cleaned out using compressed air to blow out the individual tubes. Care must
be taken not to damage the igniter.
4. INDUCER BLOWER ASSEMBLY
Inspect the pressure switch and drain tubing connections and inspect the
blower/assembly for warpage, deterioration and carbon or other build-up. If
necessary, clean the accessible portions of the housing and blower with a damp
cloth. Vacuum to remove any lint or dust from the motor assembly.
41
