Maytag Amana AC9S96, Руководство пользователя

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SYSTEM OPERATION
24
ROOM THERMOSTAT
Y2
Y/Y1
C
G R W
Y2
Y/Y1
C G R W
Y2
Y/Y1
C G
R
W
TWIN
TWIN
COND UNIT
CONTACTOR
COND UNIT
CONTACTOR
FURNACE 1
FURNACE 2
CAUTION
To prevent unreliable operation or equipment damage, the
gas manifold pressure must be as specified on the unit rating
plate. Only minor adjustments should be made by adjusting
the gas valve pressure regulator.
WARNING
Possible property damage, personal injury or death may
occur if the correct conversion kits are not installed. The
appropriate kits must be applied tot ensure safe and proper
furnace operation. All conversions must be performed by a
qualified installer or service agency.
GAS SUPPLY AND PIPING
Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.
INLET GAS SUPPLY PRESSURE
The furnace rating plate includes the approved furnace gas
input rating and gas types. The furnace must be equipped to
operate on the type of gas applied. This includes any con-
version kits required for alternate fuels and/or high altitude.
Inlet gas supply pressures must be maintained within the
ranges specified in the following table. The supply pressure
must be constant and available with all other household gas
fired appliances operating. The minimum gas supply pres -
sure must be maintained to prevent unreliable ignition. The
maximum must not be exceeded to prevent unit overfiring.
WARNING
To avoid possible unsatisfactory operation of equipment
damage due to underfiring or equipment, use the proper size
of natural/propane gas piping needed when running pipe from
the meter/tank furnace.
Furnace Startup
1. Close the manual gas shutoff valve external to the
furnace.
2. Turn off the electrical power to the furnace.
3. Set the room thermostat to the lowest possible setting.
4. Remove the burner compartment door.
NOTE: This furnace is equipped with an ignition device
which automatically lights the burner. Do not try to light the
burner by hand.
5. Move the furnace gas valve manual control to the OFF
position.
6. Wait five minutes then smell for gas. Be sure check
near the floor as some types of gas are heavier than
air.
7. If you smell gas after five minutes, immediately follow
the safety instructions in the
Safety Considerations
on
page 2 of this manual. If you do not smell gas after five
minutes, move the furnace gas valve manual control
to the ON position.
8. Replace the burner compartment door.
9. Open the manual gas shutoff valve external to the
furnace.
10. Turn on the electrical power to the furnace.
11. Adjust the thermostat to a setting above room tem-
perature.
12. After the burners are lit, set the thermostat to desired
temperature.
Gas Heat Sequence of Operation
Call for Heat
• On a call for heat, the thermostat contacts close & the
control board receives 24 VAC on the W terminal.
• The control board microcomputer runs its self-check
routine.
• The control verifies the limit switch is closed (24 VAC
on Pin 8 of the 12 Pin connector).
• The control verifies that pressure switch circuit is open
(0 VAC on Pin 5).
• The control module performs a gas valve circuitry
check to verify gas valve relay state and presence of
voltage at the valve.
• The system will energize the Induced draft blower.
• The pre-purge period begins once the pressure switch
is detected closed (24 VAC on Pin 5).
• After the completion of pre-purge, the control will
energize the igniter.
• After completion of the ignitor warm-up period:
• The gas valve is energized.
• The ignitor is de-energized as soon as flame is sensed.
• After 30 seconds the indoor blower is energized on
heating speed.
• When the thermostat is satisfied: