Nordyne M1M Maintenance, Optional Accessories, Ice Here, Roof Jack, By Homeowner, By Serviceman

Check for

Ice Here

Figure 36. Roof Jack

!WARNING:

Do not obstruct any return air open- ings, including the grille on the fur- nace. To do so may cause the furnace to activate the high limit and shut down, or it may cause asphyxiation.

18. MAINTENANCE

By Homeowner

1.Return Air - On some closet installations the return air opening to the furnace may be on the floor, on the door, on the side wall of the closet, or some combination of these. The upper grille on the front of the furnace admits return air to the blower. Return air must be provided back to the circulating blower in order to provide air distribution.

2.Filters - At least twice each season (more often in dusty areas) remove and clean the air filters with a vacuum or with warm water and soap. Reinstall when dry. Also clean dust and lint around furnace and in the fur- nace vestibule. (Figure 35.)

3.Seasonal Service Information - During ex- tremely cold weather, ice may form on the furnace roof jack. Small amounts of ice form- ing on the roof jack will present no problems to proper furnace operation. Excessive ice formation could restrict the combustion air supply to the burner, causing inefficient burner operation. If excessive ice has formed on the air inlet or exhaust portions of the roof jack, it must be carefully removed (Figure 36).

By Serviceman

All furnaces need periodic service at the begin- ning of each heating season. Call your service- man to:

a. Remove the air circulator and clean all dust and lint from the unit with a stiff bristle brush. b. Inspect the combustion chamber blower

compartment, flue collar and Roof Jack. c. Check the gas valve (if applicable) and fuel

line connections for leaks.

d. Make any adjustments necessary for good operation.

!WARNING:

Use of furnace or air conditioning com- ponents that are not included in the certification of this appliance may cre- ate a hazard, invalidate the certifica- tion, and in many states, make instal- lations illegal. Listed NORDYNE air conditioning components are speci- fied on the furnace label.

ADDITIONAL OIL

FURNACE MAINTENANCE

In addition to the preceding, the following should be performed by a qualified service contractor at least once each season for oil-fired furnaces: a. Replace the oil nozzle with the type nozzle

specified for your furnace.

b. Clean, adjust and replace if necessary the spark electrodes.

c. Reset the nozzle/drawer assembly to fac- tory specifications.

d. Clean the inside of the furnace heat ex- changer and replace the combustion liner if necessary.

e.Clean or replace the oil filter element at the oil tank.

f.Adjust the burner for top efficiency and check to make sure all fittings are leak-tight.

19. OPTIONAL ACCESSORIES

Necessary when the Furnace is Used with Some Central Air Conditioners

If an air conditioner is installed that does not use the furnace blower for air distribution and that operates independently of the furnace, the thermostat system must have an interlock to prevent the furnace and air conditioner from operating at the same time. This interlock sys- tem usually contains either a “Heat-Cool” switch which must be turned to the “Heat” or “Cool” position to activate either heating or cooling operation, or a positive “OFF” switch on the cooling thermostat.

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