IM 970-2 • MAVERICK I ROOFTOP 44 www.DaikinApplied.com
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Furnace Section Controls and Ignition System
Normal Furnace Operating Sequence
This unit is equipped with an integrated direct spark ignition
control.
1. The thermostat calls for heat.
2. The control board will run a self check to verify that the
limit control and manual reset overtemperature control
are closed and that the pressure switch is open.
3. Upon closure of the pressure switch, the control board
energizes the induced draft blower for a 15 second
prepurge.
4. After the 15 second prepurge, the gas valve opens and
the spark is initiated for a seven second trial for ignition.
5. Burners ignite and flame sensor proves all burners have
lit.
6. The circulating air blower is energized after 30 seconds.
7. The control board enters a normal operation loop in
which all safety controls are monitored continuously.
8. Thermostat is satisfied and opens.
9. The gas valve is de-energized and closes, shutting down
the burner flame.
10. The control board will de-energize the inducer after a five
second post purge.
11. The circulating air blower is de-energized after 90
seconds.
The integrated control is a three ignition system.
After a total of three cycles without sensing main burner flame,
the system goes into a 100% lockout mode. After one hour,
the ignition control repeats the prepurge and ignition cycles
for three tries and then goes into 100% lockout mode again. It
continues this sequence of cycles and lockout each hour until
ignition is successful or power is interrupted. During the lockout
mode, neither the ignitor or gas valve will be energized until the
system is reset by turning the thermostat to the “OFF” position
or interrupting the electrical power to the unit for three seconds
or longer. The induced draft blower and main burner will shut
off when the thermostat is satisfied.
The circulating air blower will start and run on the heating
speed if the thermostat fan switch is in the “ON” position.
The integrated furnace control is equipped with diagnostic
LED. The LED is lit continuously when there is power to the
control, with or without a call for heat. If the LED is not lit,
there is either no power to the control or there is an internal
component failure within the control, and the control should be
replaced.
If the control detects the following failures, the LED will flash
on for approximately 1/4 second, then off for 3/4 second for
designated failure detections:
1. Flash: Failed to detect flame within the three tries for
ignition.
2. Flash: Pressure switch or induced draft blower problem
detected.
3. Flash: High limit or auxiliary limit open.
4. Flash: Flame sensed and gas valve not energized or
flame sensed with no “W” signal.
5. Flash: Overtemperature switch open.
Содержание Maverick I MPS A03C
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Страница 51: ...Maintenance www DaikinApplied com 51 IM 970 2 MAVERICK I ROOFTOP Figure 42 System Charge Chart MPS A04C Cooling...
Страница 52: ...IM 970 2 MAVERICK I ROOFTOP 52 www DaikinApplied com Maintenance Figure 43 System Charge Chart MPS A05C Cooling...
Страница 54: ...IM 970 2 MAVERICK I ROOFTOP 54 www DaikinApplied com Maintenance Figure 46 Speed Tap Examples...
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