Thermo Products CMA1-50N A.Electrical, B.General Inspection, Vent Pipe Combustion Air Intake

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.

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