Thermo Products MHA1-100N, MDA1-50N, MHA1-75N, MHA1-50N, MHA1-125N, MDA1-75N C. House Air Blower

All installations and services must be performed by qualified service personnel.

2.Chimney/vent pipe - Vertically vented units - Remove flue pipe from inducer and inspect for restriction, loose joints, carbon build-up and condensation. Clean vent and chimney if necessary and replace or repair any degraded vent, vent connector or chimney damage found. For sidewall vented units refer to the manufacturer’s maintenance instructions for the sidewall venter.

3.Burners - If it appears that material is accumulating in the burner box the box and burners can be vacuumed. If necessary, the burners box assembly can be removed from the separator panel, by removing the screws behind the 1” holes near the top of the burner box, and the one screw in the flange under the burner box.

4.Inducer Blower Assembly - Inspect pressure switch tubing connections and inspect inducer blower/assembly for corrosion, warpage, deterioration and carbon build-up. If necessary, clean housing and blower wheel with a damp cloth. Vacuum to remove any lint or dust from motor assembly. The inducer gasket and the collector box gasket must be replaced if they show any sign of having been damaged.

5.Clean all furnace markings as necessary and verify that all are still legible. Any illegible or missing markings must be replaced. Replacements can be obtained by contacting Thermo Products.

Once all components are cleaned, they must be re-installed to their factory- produced state. Any seals or joints in the flue system, which have been removed or loosened, must be reconnected and sealed if necessary. Do this in accordance with the installation instructions. (Section II, J, of this manual for vertically vented units, or Section II, K, of this manual for sidewall vented units).

NOTICE: After cleaning the furnace, reference the burner adjustment section of this manual. Check for operation, proper combustion and no gas leakage according to the procedure outlined in Section III, of this manual, Burner and Adjustment. Observe the burner flame illustrations and follow the adjustment procedures if proper flame(s) are not present.

C. House Air Blower

Check and clean the blower wheel, housing, and compartment with a vacuum. Check the motor nameplate and follow motor manufacturer instructions for lubrication, if required.

IMPORTANT: Some motors are permanently lubricated and should not be oiled. See motor nameplate for specific instructions.

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