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CHAPTER
2
WIRING AND INSTALLATION
Topics covered
Power supply guidelines and requirements
RS485 Interface cable Type
Thermostat powered by separate transformer
Thermostat powered by public transformer
Power supply guidelines and requirements
The thermostat uses 24VAC power from a UL Listed Class-2 24VAC transformer,
not provided. It also uses a half-wave rectifier to convert the AC power supply to
onboard power. This enables multiple devices with half-wave power supplies to be
powered from a single, grounded transformer.
Warning: Half wave devices and full wave devices must not use the same AC transformer.
You must maintain wiring polarity. Failure to do so can result in equipment dam-
age. If the HVAC equipment has an internal circuit board that is powered by the
same transformer that will power the Thermostat, verify that it is NOT full wave.
Power supply guidelines and requirements
Fig 11. Power supply wiring connection
Power Terminals
R
24VAC
C
Diode
+ DC Voltage
Capacitor
GND
21
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