PRODUCT DESIGN
76
FAN ONLY MODE
The normal operational sequence in fan only mode is as
follows:
1. R and G thermostat contacts close, initiating a call for
fan.
2. Integrated control module performs safety circuit checks.
3. Circulator blower is energized on continuous fan speed
(56% of high stage cooling) following a five (5) second
delay. Electronic air cleaner terminals are energized.
4. Circulator blower runs, integrated control module moni-
tors safety circuits continuously.
5. R and G thermostat contacts open, completing the call
for fan.
6. Circulator blower is de-energized. Electronic air cleaner
terminals are de-energized.
7. Furnace awaits next call from thermostat.
DEHUMIDIFICATION M ODE
The normal operational sequence in dehumidification
mode is as follows:
1. R and YLO/G or Y/G thermostat contacts close, initiaing
a call for cool.
2. Integrated control module performs safety circuit checks.
3. Outdoor fan and compressor are energized to their ap-
propriate speed.
4. Circulator blower is energized on the appropriate cool
speed at the level and time determined by the selected
ramping profile. Electronic air cleaner terminals are en-
ergized with circulator blower.
5. Furnace circulator blower and outdoor cooling unit run
their appropriate speed, integrated control module moni-
tors safety circuits continuously.
6. Dehumidistat opens on humidity rise allowing the fur-
nace circulator blower to operate at 80% of the cooling
speed during combined thermostat call for cooling and
dehumidistat call for dehumidification.
7. Humidistat opens on humidity fall allowing furnace cir-
culator blower to switch back to normal cooling speed.
8. R and YLO/G or Y/G thermostat contacts open, com-
pleting the call for cool.
9. Outdoor fan and compressor are de-energized.
10. Circulator blower continues running during a cool off
delay period. The OFF delay time and airflow level are
determined by the selected ramping profile.
11. Electronic air cleaner terminals and circulator blower
are de-energized.
12. Furnace awaits next call from thermostat.
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