Digital Touchpad With Automatic Changeover From Cooling To Heating & Heating To Cooling - McQuay PDAA Installation & Maintenance Data

Digital Touchpad with Automatic
Changeover from Cooling to Heating &
Heating to Cooling
AUTO
Available with the Programmable LUI (668003801)
and Premium Board (667997301) only. The Auto-
Changeover board has a new control set with a
touchpad label that shows, "AUTO". The Auto
Changeover control provides:
• Auto changeover from heat to cool and vice versa
• LED's from top down that read: Sleep, Cool, Auto,
Fan, and Heat
AUTO Non-Programmable Mode:
• Display shows both HEAT and COOL icons
• Temperature set point displays between the HEAT
and COOL icons
• Setpoint is adjusted with Up and Down arrows
• Heating initiates when the room temperature falls
one degree below the thermostat setpoint. Heating
terminates when the room temperature reaches two
degrees above the setpoint
• Cooling initiates when the room temperature
reaches one degree above the thermostat setpoint.
Cooling terminates when the room temperature
falls two degrees below the setpoint
AUTO Programmable Mode:
• HEAT and COOL icons alternatively flash with
their respective programmed setpoints
• The system engages cooling and heating automati-
cally to maintain respective setpoints according to
system model selection
• The 2-degree gap between setpoints represents the
deadband and is necessary to prevent unecessary
switching between heating and cooling
The 2 degree deadband provides the following:
• Heating activates when the room temperature is
one degree below the thermostat setpoint plus the
2 degree deadband.
• Cooling activates when the room temperature is
one degree above the thermostat setpoint plus the
2 degree deadband
Keys and Indicators Labels
ON/OFF, FAN SPEED, MODE,
FAN MODE, SLEEP, PROG-ON/OFF
8 Push Buttons
Temp buttons:
Temp UP and
SLEEP, COOL, AUTO, FAN,
9 LED Indicators
HEAT, HIGH, LOW, CYCLE, CONT.
LED 2 Digit Displays No Label
IM 934-2 Applied PDAA/PDHA / Page 29 of 44
for
for Temp DOWN