INTRODUCTION
Thank you for purchasing your new RC-90 electronic communicating thermostat. Your thermostat will provide you with comfort, convenience, and energy savings for years to come.
We hope that you take a few moments to become familiar with all of the features of this fine product by reviewing this manual. Please keep this manual on file for future reference.
DESCRIPTION
The RC-90 is a precision digital thermostat for single stage heating and cooling systems. It has the capability of being controlled both locally and by remote control. It offers programmability, stand alone operation, and robust, optically isolated communications with automation systems, utility control systems, and personal computers.
There are several items which can be configured at the time of installation. These items have a check box ( 
) for your installer to indicate which features are used in your system.
The RC-90 can act as the Master thermostat in a zoned heating and cooling system. Setting the Master thermostat to HEAT mode will allow it and the other zones to heat; setting the Master to COOL will allow it and the other zones to cool. Setting the Master to OFF will turn off all other zones.
MAINTENANCE
Your new thermostat is maintenance free. There is no battery to install or replace. If necessary, clean unit carefully with a mild soap solution on a soft cloth.