Amana GUI Installation Instructions Manual page 28

Check Temperature Rise
Check the temperature rise through the unit by placing
thermometers in supply and return air registers as close
to the furnace as possible. Thermometers must not be
able to "see" the furnace's heat exchangers, or false
readings could be obtained.
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 or Specification Sheet.
NOTE: Air temperature rise is the temperature difference
between supply and return air.
With a properly designed system, the proper amount of
temperature rise will normally be obtained when the unit
is operated at rated input with the "as shipped" blower
speed.
If the correct amount of temperature rise is not obtained,
it may be necessary to change the blower speed. A faster
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
temperature rise through the furnace as marked on the
rating plate.
Changing Blower Speeds
WARNING
To avoid death or personal injury due to
electrical shock, turn off power to the
furnace before changing speed taps.
All furnaces ship at high speed for cooling and the speed
listed in Specification Sheet for heating. These speeds
should be adjusted by the installer to match the job
requirements. See Specification Sheet for details.
Connect the correct motor leads to the COOL, HEAT,
and PARK terminals. If heating speed will equal cooling
speed, use the jumper wire provided. All unused motor
leads that are not connected to "PARK" terminals on the
control must be taped to prevent shorts.
Figure 42
High Limit Control
Check High limit Control
WARNING
To prevent death, personal injury, prop-
erty damage or premature failure of heat
exchanger, do not adjust the limit control
(factory preset).
Check limit control operation after 15 minutes of opera-
tion by blocking the return air grille(s).
1. After several minutes the burners must go OFF.
Blower will continue to run.
2. Remove air restrictions and burners will relight after
a cool down period of a few minutes.
Adjust the thermostat setting below room temperature
1. Burners must go off.
2. Circulating air blower will continue to run for 60, 90,
120 or 180 seconds as set.
IMPORTANT NOTE: This unit must not be used as a
construction heater during the finishing phases of con-
struction of a new structure. This type of use may result
in premature failure due to extremely low return air
temperatures and exposure to corrosive or very dirty
atmospheres.
To Turn Off Furnace
1. Set the thermostat to lowest setting.
2. Turn off the electrical power supply to the furnace.
3. Turn the gas control knob clockwise
"Off" position (Figures Figures 36, 37, & 38) or push
the switch to the OFF position (Figure 39). The knob
should turn easily. Do not use excessive force.
4. Close manual gas shut-off valve external to the
furnace.
5. Replace the door on the unit.
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