Instruction/ maintenance manual of the product 90 SERIES White Rodgers
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COMFOR T -SET ® 90 SERIES MUL TI-ST AGE/HEA T PUMP INST ALLA TION/CONFIGURA TION This White-Rodgers Automatic Setback Digital Thermostat uses microcomputer technology to provide precise time and temperature control.
2 A TTENTION! This product does not contain mercury . However , this product may replace a unit which contains mercury . Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury . W earing nonabsorbent gloves, take up the spilled mercury and place into a container which can be sealed.
3 HEA T PUMP TERMINAL OUTPUTS Refer to equipment manufacturers’ instruc- tions for specific system wiring information. Y ou can configure the thermostat for use with the following heat pump system types: HEA T PUMP TYPE 1. Single-stage compressor system; gas or electric backup.
4 RESET SWITCH See the T roubleshooting section at the end of this document for more information about the function of this switch. E2/P SWITCH The E2/P switch is located on the back of the thermostat body (see fig. 2). This switch controls how the E2/P terminal of the thermostat will be energized.
5 * NOTE: COMP LOCK OFF permanently defeats compressor lockout. Y ou must turn this selection ON if you do not have a system that already pr ovides compressor short-cycle protection. Please see “Lockout Bypass Option” to temporarily override compressor lockout.
6 These numbers are approximate and represent operation with a typical system. Actual temperature differentials and run times may vary widely based on your building and equip- ment, as well as outdoor temperature conditions. ment range for COOLING is from 9 to 40.
7 sensor is not functioning, when you exit the menu, CHECK ST A T SYSTEM will be displayed. T o correct this, check for proper remote sensor installation and wiring. If necessary , return to the menu and be sure that the remote sensor items are set correctly .
WHITE-RODGERS EMERSON ELECTRIC CO. 9797 REAVIS ROAD ST. LOUIS, MISSOURI 63123-5398 www.white-rodgers.com TROUBLESHOOTING RESET BUTTON If the thermostat does not respond when keys are pressed, or the thermostat is not operating properly , you may use the reset button located on the back of the thermostat body (see fig.
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