Nordyne M3RL Maintenance, Accessory Kits, Combustion Air and Vent System, Air Filter

FURNACE ACCESSORY KITS

Kit		Order Number
A/C Coil Box		911969A
Side Return Air Kit		904003
Top Return Air Kit		904015
Sloped Roof VentilAire III Kit		914098
Sloped Roof VentilAire IV Kit		914229
Soffit VentilAire Kit		917201
Concentric Vent Termination Kit		903578
(for horizontal and vertical venting)
Horizontal Exterior Vent
Mounting Kit	3"PVC	902375
Neutralizer Kit - All Models		902377

Table 12. Accessory Kits

Gas Valve – The gas valve controls the flow of gas to the burners. When the gas valve is energized it automatically opens and regulates the gas pressure in the manifold.

Pressure Switch – The pressure switch veri- fies that the inducer is drawing the combustion gases through the heat exchanger. It also senses a blocked condensate drain condition.

Deck Limit Switch (Auxiliary Limit) – The deck limit protects the furnace filter tempera- ture from overheating when the motor has malfunctioned. If the deck switch opens, the power for the furnace will shut down (see Figure 29).

Supply Air Limit Switch – The supply air limit switch prevents the air temperature leaving the furnace from exceeding the maximum outlet air temperature.

Vent Safety Switch – The vent safety switch shuts the furnace down if the outlet flue gas temperature increases above 145°F. This switch protects the plastic flue system and the inducer from over-temperature conditions.

Flame Roll-Out Switch – This switch pro- vides flame roll-out protection to the furnace and combustion air inlet pipe.

MAINTENANCE

It is recommended that the furnace be checked yearly. At a minimum, this check should include the following items:

!WARNING:

To avoid electric shock, personal injury, or death, turn off the power at the disconnect or the main service panel before performing any maintenance.

!WARNING:

Holes in the vent pipe or heat exchanger can cause products of combustion to enter the occupied space. Replace the vent pipe or heat exchanger if leaks are found. Failure to prevent products of combustion from being circulated into the occupied space can crate poten- tially hazardous conditions, including carbon monoxide poisoning, that could result in personal injury or death.

Combustion Air and Vent System

Check the combustion air and vent pipe to ensure that it is not damaged, corroded or blocked by debris. Any damaged section of vent pipe must be replaced, and any obstruc- tion or blockage must be removed prior to operating the furnace.

Air Filter

An air filter is supplied with the furnace as shipped from the factory. Filters should be changed or cleaned monthly during the heating season. New or newly renovated homes may require more frequent changing until the con- struction dust has been removed.

29