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White- Rodgers has been producing energy saving controls for over 60 years. We have been designing and producing the Comfort- Set family of electronic programmable thermostats since 1982. Comfort-Set 90 is the third generation of the electronic programmable family. We believe you will find that the Comfort-Set 90 is the most user friendly and technologically advanced thermostat and humidifier control available today. You will find information about thermostat buttons and display beginning on page 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . .1 Installation/Configuration . . . . . . . . . . . . . . .4 Manual Operation and Programming . . . .24 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 FAQs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 Troubleshooting . . . . . . . . . . . . . . . . . . . . . .42 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46 Use the tabs at the bottom of the page to quickly locate sections 1 Introduction Installation/Configuration Programming FAQs Features Troubleshooting Index INTRODUCTION INTRODUCTION THE THETHETHETHETHE THERMOST THERMOSTTHERMOSTTHERMOSTTHERMOSTTHERMOSTA AAAAAT B T BT BT BT BT BUTT UTTUTTUTTUTTUTTONS ONSONSONSONSONS See inside front cover for illustration showing button locations. 1 (Blue arrow) Lowers temperature setting (45°F or 7°C minimum) 2 (Red arrow) Raises temperature setting (99°F or 37°C maximum) 3 The yellow indicator glows when the system is operating. 4 This button (on top of the cover) lights the display. 5 Used to initiate or review thermostat programming. 6 Used with TIME FWD /TIME to set the clock. BACK 7 Used to adjust the time backward, or to select the previous menu item. 8 Used to adjust the time forward, or to select the next menu item. 9 Used with TIME FWD /TIME to set the current day and with to BACK HOLD enter VACATION mode. 10 Used to advance operation to the next program period. 11 Used to manually override programming to hold at a selected temperature. 12 Used to display humidity. 13 Selects fan operation (see The Display, figure 1 21 ). This button is also used to program the fan to run continuously during a program period. 14 Used to set/reset the filter and humidity maintenance timer. 15 Sets the system mode (HEATing, OFF, COOLing, or AUTOmatic changeover). 16 Used to adjust the clock one hour forward or back. 17 Used to start or return to program operation. 2 LAR LARLARLARLARLARGE LIGHTED (L GE LIGHTED (LGE LIGHTED (LGE LIGHTED (LGE LIGHTED (LGE LIGHTED (LCD) DISPLA CD) DISPLACD) DISPLACD) DISPLACD) DISPLACD) DISPLAY YYYYY The thermostat display alternately shows the current time and the current temperature on the left side. The display also shows the temperature you have programmed or set on the right side of your screen. 18 Displays system mode (HEA HEAHEAHEAHEAHEAT TTTTT, OFF OFFOFFOFFOFFOFF, COOL COOLCOOLCOOLCOOLCOOL, A AAAAAUT UTUTUTUTUTO OOOO O, HOLD HOLDHOLDHOLDHOLDHOLD, V VVVVVA AAAAACA CACACACACA or HUMD HUMDHUMDHUMDHUMDHUMD). During programming displays the time period (MOR, MOR,MOR,MOR,MOR,MOR, D DDDDDA AAAAAY YYYYY, ,,,,, EVE, EVE,EVE,EVE,EVE,EVE, NHT NHTNHTNHTNHTNHT) being programmed. In the configuration 18 19 20 21 FAN AUTOHRS CHECK BATTERY F AM MON HEAT WED THU FRI SAT SUNTUE 222324 menu, the menu item name is shown, one word at a time (PR PRPRPRPRPRGM GMGMGMGMGM MODE MODEMODEMODEMODEMODE, EMR EMREMREMREMREMR, COOL COOLCOOLCOOLCOOLCOOL F FFFFFAN ANANANANAN DELA DELADELADELADELADELA OFF OFFOFFOFFOFFOFF, etc.). 19 CHECK B CHECK BCHECK BCHECK BCHECK BCHECK BA AAAAATTER TTERTTERTTERTTERTTERY YYYYY appears when the “AA” alkaline batteries are weak and should be replaced. B BBBBBA AAAAATTER TTERTTERTTERTTERTTERY YYYYY appears when the thermostat is running on battery power only. CHECK ST CHECK STCHECK STCHECK STCHECK STCHECK STA AAAAAT TTTTT appears when the thermostat detects certain problems within itself. CHECK SY CHECK SYCHECK SYCHECK SYCHECK SYCHECK SYSTEM STEMSTEMSTEMSTEMSTEM appears when the thermostat detects certain problems in the heating or humidity system. FAN AUTO HEAT HRS CHECK BATTERY F AM MON WED THU FRI SAT SUNTUE 18 25 20 Indicates the length of time remaining in a temporary hold condition. Also indicates the length of time remaining in VACATION mode. 21 Displays F FFFFFAN ON AN ONAN ONAN ONAN ONAN ON when the fan is operating continuously. Displays F FFFFFAN ANANANANANA AAAAAUT UTUTUTUTUTO OOOOO when the fan cycles with the heating or cooling system. 22 Displays the setpoint temperature. In HUMD mode, shows humidity setpoint. 23 Alternately displays room temperature and time of day. In HUMD mode, shows actual humidity. 24 Shows the current day of the week. When programming, shows the day(s) being programmed. 25 The word HEA HEAHEAHEAHEAHEAT TTTTT or COOL COOLCOOLCOOLCOOLCOOL will appear above or below the setpoint if area 18 is needed to display other information. Introduction Figure 1. The Display 3 INSTALLATION AND CONFIG...