Maintenance - Amana AIR COMMAND 80 Manual

CHECK LIMIT AND FAN CONTROL
Check limit control operation after 15 minutes of operation by
blocking the return air grille(s). (Fig. 10)
1. After several minutes the main burners must go OFF.
Blower will continue to run.
2. Remove air restrictions and main burners will relight after
a cooldown period of a few minutes.
Adjust the thermostat setting below room temperature.
1. Main burners must go off.
2. Circulating Air Blower should continue to run briefly until sup-
ply air temperature drops to approximately 100-90 deg. F.
Fan and limit controls are preset at the factory. The control is
set for the fan to go off at 100-90 deg. F.
NOTE: If necessary, adjust fan ON/OFF settings to obtain
satisfactory comfort level. The fan comes on at approx-
imately 125 deg. F.
A
CAUTION
Do not adjust the fan OFF setting so low
as to give continuous fan operation. The
burners cannot relight until after the sup-
ply air temperature is low enough to shut
OFF the fan control. Because of this, low
OFF settings of the fan control could
cause the building to become uncomfort-
ably cool before the burners could
relight.
A
WARNING
To avoid premature failure of heat
exchanger or possible property damage,
injury or fire, do not adjust the limit con-
trol, which is factory preset.
CHECK TEMPERATURE RISE
Check the temperature rise through the unit by placing ther-
mometers in supply and return air registers as close to the
furnace as possible.
1. All registers must be open; all duct dampers must be in
their final (fully or partially open) position, and the unit
operated for 15 minutes before taking readings.
2. The temperature rise must be within the range specified
on the rating plate.
NOTE: Air temperature rise is the temperature difference
between supply and return air.
With a properly designed system, the proper amount of tem-
perature rise will normally be obtained when the unit is oper-
ated at rated input with the recommended blower speed.
If the correct amount of temperature rise is not obtained, it
may be necessary to change the blower speed. A higher
blower speed will lower the temperature rise. A slower blower
speed will increase the temperature rise.
NOTE: Blower speed must be set to give the correct air tem-
perature rise through the furnace as marked on the rating
plate.
CHECK MAIN BURNER FL ME
Flames should be stable, soft and blue, (dust may cause
orange tips but they must not be yellow). They should extend
directly outward from the burner without curling, floating or
lifting off. (Fig. 11)
BLUE FLAMES W/O
CURLING OR LIFTING
OFF BURNER AREA
j
Fig. 11 — Burner Flame.
CHANGING BL:I WER SPEEDS
A
WARNING
To avoid electrical shock, injury or death,
when changing speed taps turn off power
to the furnace.
A multi-speed motor is used in the furnace blower. It provides
easy speed selection for both heating and cooling air flow.
Page 3 shows the CFM and E.S.P. relationship for proper
selection of heating and cooling speeds.
Refer to the WIRING DIAGRAM on the furnace to connect
the proper wires to the correct motor leads. All unused motor
leads must have wirenuts.
ACAUTION
Some installations will use a different
blower speed for cooling than is used for
heating. If this is the case, do not set the
thermostat fan switch to ON (constant
fan operation) without first confirming
that the cooling fan speed give a tem-
perature rise within the limits listed on
the unit nameplate. Temperature rises
outside of the limits listed could result in
premature failure of the heat exchanger
or venting system.
MAINTENANCE
A
DANGER
To avoid electrical shock, injury or death,
disconnect electrical power before per-
forming any maintenance.
Have the furnace checked at least once every year, before
the heating season begins, to be sure that there is adequate
combustion air and that the vent system is working properly.
Have chimney flue and vent pipe checked to be sure they are
not blocked by debris, which would permit fumes to enter the
house. Replace any rusted out vent pipe.
AIR FILTER
AWARNING
Never operate furnace without a filter
installed as dust and lint will build up on
internal parts resulting in loss of efficiency,
equipment damage and possible fire.
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