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Manual 2100-559A
Page
6 of 6
• Cool Setpt/Heat Setpt are for occupied periods
• Cool Setback/Heat Setback are for unoccupied
periods, and will only be used if scheduling
is enabled (see the Advanced Programming
Features manual 2100-560)
• Min Setpt Diff is the closest the heating and
cooling setpoints can come to one another
(3°F is recommended minimum).
• Deadband is the space in degrees from
setpoint in which the cooling and/or heating
sequence will modulate to 100% capacity
(2°F is recommended minimum).
5. Press ENTER button to select setpoint option.
6. Press UP or DOWN buttons to enter specific degree
amount for setpoint. Press ENTER button to save
new setpoint.
7. Press LEFT button two (2) times to return to Home
screen.
NOTE: Although cooling/heating setpoints can be
accessed by simply pressing the UP or DOWN
buttons during normal operation, any changes
made in this fashion will not be permanent
but last only for a specific length of time as an
“override” feature. This temperature change
will not be permanent. See the Advanced
Programming Features manual 2100-560 for
further information.
NOTE: Any system start-up conducted with indoor
ambient temperatures lower than 56°F or
above 86°F will experience an internal Low
Temperature or High Temperature alarm. This
will not affect normal operation and can be
cleared easily. See the Advanced Programming
Features manual 2100-560 for further
information. Start-up procedures conducted
with extreme temperatures indoors/outdoors
may cause a “SERVICE” warning flashing on
the face of the controller. This also will not
affect normal operation, and should clear itself
once interior temperatures and refrigerant
pressures normalize.
NOTE:
The ECU Series Controller will become
sluggish/inoperable at extremely low
temperatures (< 20°F). Care should be taken
to warm controller before initial start-up.
The ECU Series Controller should be fully operational
at this point. For further controller enhancement or
operation detail, please consult the most recent version
of the Advanced Programming Features manual 2100-
560.