Sequence Of Operation; Start-Up, Adjustments, And Checks - Amana GUX-X Installation Instructions Manual

When the furnace is heating, the temperature of the return
air entering the furnace must be between 55°F and 100°F.
XI. Sequence of Operation
NORMAL HEATING SEQUENCE
1. Thermostat calls for heat.
2. The induced draft blower is energized.
3. The ignitor is energized and is allowed to preheat for
17 seconds.
4. The gas valve is energized delivering gas to the
burners and starting combustion.
5. The control checks for a signal from the flame sensor
within seven seconds after the gas valve is energized.
Gas will only continue to flow if a signal is present.
6. The control waits 30 seconds and turns on the air
circulation blower to the speed that was selected for
heating operation.
7. The thermostat is satisfied and opens.
8. The control de-energizes the gas valve.
9. After a 15-second delay while flue products are purged
from the furnace heat exchanger, the induced draft
blower is de-energized.
10. The air circulation blower has an adjustable delay-off
timing of 60, 90, 120 or 180 seconds (starting from the
time the gas valve closes). This allows more heat from
the furnace to be transferred to the conditioned space.
After this time has elapsed, the blower will be de-
energized.
NORMAL COOLING SEQUENCE - INTEGRATED
IGNITION CONTROL
With the room thermostat in the FAN-AUTO position, the
indoor air circulation blower and outdoor condensing unit
will be energized when a call for cooling occurs and the
indoor air circulation blower will come on following a five
second delay. When the call for cooling ends, the outdoor
condensing unit will be de-energized. The indoor air circu-
lation blower will continue to run for 45 seconds.
XII. Start-Up, Adjustments, and Checks
GENERAL OPERATION
This furnace is equipped with an electronic ignition device
to light the burners and an induced draft blower to exhaust
combustion products.
An interlock switch prevents furnace operation if the blower
door is not in place. Keep the blower access doors in place
except for inspection and maintenance.
This furnace is also equipped with a self-diagnosing elec-
tronic control module. In the event a furnace component is
not operating properly, the control module LED will flash
on and off in a factory-programmed sequence, depending
on the problem encountered. This light can be viewed
through the observation window in the blower access door.
Refer to the Timing Charts in Section IX for further expla-
nation of the lighting codes and Section XII, Abnormal
Operation - Integrated Ignition Control for an explanation
of the possible problem.
On new installations, or if a functional part such as the gas
valve, pressure switch, or limit control has been replaced,
the operation of the furnace should be checked.
Check furnace operation as outlined in the following in-
structions. If any sparking, odors, or unusual noises are
encountered, shut off electrical power and recheck for
wiring errors, or obstructions in or near the blower motors.
Various shipping materials must be removed before the
blower motor is operated.
ROLLOUT PROTECTION DEVICE
If the flames from the burners are not properly drawn into
the heat exchanger, a protection device will open causing
the gas valve to close. The protection device is located on
the manifold assembly (Figure 23) on GUC and GUX
models and on the burner bracket on GUD models (Figure
24). This device resets manually.
Roll-Out Protection Device - GUC & GUX
Roll-Out Protection Device - GUD Only
21
Flame Roll-Out
Protection
Device
Figure 23
Flame Roll-Out
Protection Device
Figure 24