Nordyne M3RL Series Maintenance And Service Manual

Lubrication -- The bearings in the circulating
air blower motors used in these furnaces are
pre-lubricated and sealed at the factory. No
further oiling of the bearings is required for the
life of the motor.
Blower Compartment -- The blower com-
partment should be cleaned monthly during the
heating and cooling seasons to remove any dirt
and lint that may have accumulated in the
compartment or on the blower and motor.
Buildup of dirt and lint on the blower and motor
can create excessive loads on the motor re-
sulting in higher than normal operating tem-
peratures and possible shortened service life.
Burner Maintenance -- Check the burner
flames at the start of every heating season.
Set the thermostat to a temperature setting
above the room temperature. Remove the front
door from the furnace, close the door switch
(see Figure 1), and visually inspect the burner
through the view hole to make sure that the
flame is drawn into the center of the heat
exchanger tube (see Figure 3). In a properly
adjusted burner assembly, the flame bends up
at the end of the heat exchanger tube, and the
end of the flame will be out of sight around the
bend. The flame color should be blue, however
some light yellow streaks may occur on the
outer portions of the flame.
CAUTION:
Some components in the burner ves-
tibule are at high temperatures while
the burners are operating. Use cau-
tion to avoid personal injury.
Inspect the burners, mounting brackets, and all
other parts in the vestibule for signs of deterio-
ration. The burner vestibule should be vacu-
umed clean and inspected annually. Open the
door switch and replace the front door.
Flame
Burn,_ __f,_-_
I
Manifold
Figure 3. Burner Inspection
CAUTION:
Do not strike any of the internal elec-
trical components while vacuuming.
6. Operating Instructions
READ THE SAFETY INFORMATION ON
PAGE 8 BEFORE OPERATING,
WARNING
Should overheating occur, or the gas
supply fail to shut off, shut off the
manual gas valve to the furnace be-
fore shutting off the electrical supply.
/ ADVERTISSEMENT:
En cas de temperature excessive, ou
s'il est impossible de couper
I'alimentation en gaz, fermer le robinet
manuel d'alimentation en gaz du
generateur d'air chaud avant de
couper I'alimentation electrique.
These furnaces are equipped with roll-out limit
switch(s), a vent safety switch, and a pres-
sure switch (See Figure 1). The pressure
switch verifies that the flame is receiving com-
bustion air. If the flame is not drawn into the
heat exchanger tube, the roll out limit switch or
flame sensor, will shut the furnace down.
The vent safety switch shuts the furnace down
if the vent becomes blocked or restricted.
Furnace Fails To Operate -- If the furnace
does not operate, check the following:
1) Is the thermostat operating properly?
2) Is the front door in place?
3) Is the furnace disconnect closed?
4) Has the circuit breaker tripped (or fuse
blown)?
5) Is the gas turned on?
6) Is the filter dirty or plugged?
If the combustion and circulating air blowers
are operating, and items 1 through 6 have been
6

Nordyne M3RL Series Specifications

General

Brand	Nordyne
Model	M3RL Series
Category	Furnace
Language	English