Summary of the content on the page No. 1
™
T8775A,C The Digital Round
Non-Programmable Thermostats
PRODUCT DATA
FEATURES
• Attractive styling complements any decor.
• Simple to use. Turn the dial to adjust the setpoint
temperature.
• Large easy-to-read display. The temperature reading is
easily seen from a distance.
• Backlit display. On-demand backlighting makes it easy
to read the display in a dark room or hallway.
• No batteries required. The setpoint temperature is held
permanently in memory in the event of a power failure.
• P
Summary of the content on the page No. 2
™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS Ambient Range: SPECIFICATIONS 40°F to 110°F (4.4°C to 43.3°C). Shipping Temperature Range: IMPORTANT -20°F to 120°F (-28.9°C to 48.9°C). The specifications given in this publication do not include normal manufacturing tolerances; therefore, Humidity Ratings: 5% to 90% RH, non-condensing. an individual unit might not exactly match the listed specifications. Also, this product is tested and cali- Mounting Hardware: brated under closely c
Summary of the content on the page No. 3
™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS INSTALLATION YES ROOM SET NO NO 5 FEET [1.5 METERS] NO M19716A Fig. 2. Typical thermostat location. Mount wallplate to wall (See Fig. 4) as follows: Separate Wallplate from Thermostat 1. Place your thumbs on top of the thermostat and wall- plate. Use your thumbs to pull the thermostat away from the wallplate. See Fig. 3. WALL ANCHORS (2) WALL PLATE TOP OF WALL PLATE THERMOSTAT 1 M19679 WIRING HOLE M19499 1 INCH SCREW (2) 1 WHEN USING WA
Summary of the content on the page No. 4
™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS 4. Tap the provided wall anchors into the drilled holes until Refer to Fig. 7 through 11 for typical wiring diagrams. they are flush with the wall. 5. Pull the thermostat wires through the wiring hole on the wallplate and reposition the wallplate over the wall anchors. 6. Attach the wallplate to the wall with the screws pro- vided. 7. After wiring the wallplate, plug the hole to prevent drafts from affecting the thermostat; see Wiring
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™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS B Rc G 2 Y R W COMPRESSOR CONTACTOR HEATING FAN RELAY OR RELAY 1 1 VALVE COIL M19497 FUEL SWITCH Fig. 12. Fuel switch. 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. DIP Switch REMOVE FACTORY INSTALLED JUMPER BETWEEN R AND R . 2 C To adjust the heat cycle rate or the Fahrenheit/Celsius M19517 temperature display, locate DIP switch 1, 2 and 3 on the back Fig. 10. Typical hookup of T8775C in heat-cool sy
Summary of the content on the page No. 6
R E M R A W ™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS Fahrenheit/Celsius Indication Use DIP switch 3 to set the desired temperature indication. See Table 2. (T8775C ONLY) SELECTS (T8775C ONLY) ON/AUTO SELECTS Table 2. Temperature Indication. COOL/OFF/HEAT Fahrenheit/Celsius Display DIP Switch 3 Fahrenheit (factory setting) Off ROOM SHOWS THAT THE SET CURRENT ROOM Celsius On TEMPERATURE IS DISPLAYED. Mount Thermostat to Wallplate (see Fig. 14) SHOWS THAT THE CURRENT TEMPERAT
Summary of the content on the page No. 7
™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS Table 3. T8775 Power Stealing. ROOM Power Stealing Circuit SET System Switch T8775A T8775C Heat R and W R and W M19490 Off — R and W Cool — Rc and Y Fig. 18. Room temperature display. The T8775 Thermostat only operates when mounted on the Adjust Temperature Setpoint wallplate with 24 Vac applied. Batteries are not required for operation because the temperature setpoint is permanently Turn the dial clockwise to raise the temperature set
Summary of the content on the page No. 8
™ T8775A,C THE DIGITAL ROUND NON-PROGRAMMABLE THERMOSTATS TROUBLESHOOTING GUIDE HEATING OR COOLING EQUIPMENT NO AC POWER TO THERMOSTAT. CHECK POWER TO HEATING AND COOLING EQUIPMENT WILL NOT OPERATE. – ON-OFF SWITCH – FUSE OR CIRCUIT BREAKER – LOOSE 24V CONNECTION: – AT THERMOSTAT – AT FURNACE/AIR CONDITIONER – INCORRECT WIRING (SEE WIRING DIAGRAMS) THERMOSTAT INOPERATIVE. SEE CHECKOUT SECTION. PRESENT SETTING TOO LOW/HIGH. ADJUST TEMPERATURE BY TURNING DIAL CLOCKWISE OR COUNTER-CLOCKW
