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Stand Alone with Thermostat
Once Occupied Mode is set to “Control by Thermostat” the
DDC Controller will follow the commands from a regular 24VAC
thermostat, according to the following convention:
• •G - Indoor fan
• •Y1 - First stage of compressor
• Y2 - Second Stage of compressor
• B - Not Used
• W1 - First Stage Auxiliary heat (electric or gas)
• W2 - Second Stage Auxiliary heat (electric or gas)
• L - Comfort Alert signal (output)
• R & C - 24VAC
Figure 3: Thermostat Inputs and Outputs
Standalone with Zone Sensor and Time
Clock
If Occupied Mode is set to any of the options other than “Off”
and “Control By Thermostat”, the control will operate in Stand
Alone mode or network using its local temperature sensors
to determine demand. The system can be set up with a zone
sensor to determine heat or cool demand and a solid state
time clock to determine occupancy. (See Occupied Mode on
page 20)
Figure 4: Standalone with Zone Sensor and Time Clock
+24VAC
1st Stage
Compressor
2nd Stage
Compressor
Indoor Fan
24V Common
1st Stage Heat
2nd Stage Heat
Occupancy
Signal
Reversing
Valve
Alert
10k Thermistor
2k
5k
10k Pot
Setpoint Adj.
Override
Button
Zone Sensor
Time Clock
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