Honeywell T8090A/191108A- Manual

69-0574—2 6 15 191108AJ WALLPLATE. Provides mount- ing base and wiring connections forheating-only or cooling-only thermostat. 16 Q682B SUBBASE. Provides mounting base, wiring connections and manualswitching control for heating/coolingthermostat. M2421 15 AUTO OFF COOL HEAT ON FAN B O W Y R G M719 1...

7 69-0574—2 Setting The Temperature For Heating: Set the left lever (blue mark) to the energy savings temperature you want when you aresleeping or your home is unoccupied. Set the right lever (red mark) to the tem- perature you want for normal comfort periods. NOTE: You may override the time program...

69-0574—2 8 Inserting Clock Batteries Power is supplied to the clock by the 24 Vac transformer, by two AAA alkaline batteries(included), or by the heating or cooling controlcircuit. Backup batteries may be installed tosupply power to the clock if power is inter-rupted when using 24 Vac powering meth...

9 69-0574—2 Setting The Clock Lift thermostat flip-up cover and you’ll find the 24-hour program dial, slotted in 10-minuteincrements. Adjust the clock to the current timeby moving the minute hand carefully in clock-wise direction. DO NOT reverse the minute hand. When time is correctly set, the Time ...

69-0574—2 10 Programming You can program your thermostat to automatically lower and raise the temperatureone or more times every 24 hours. Before setting your program: Lift thermostat flip-up cover and you'll find the 24-hour program dial. The slots on theprogram dial (Fig. 4) are for the program pi...

11 69-0574—2 To change the pins or add a newenergy savings period: • To insert a pin, push it straight into theselected notch on the program dial until it’scompletely seated. • To remove a pin, press against program dialand pull the pin straight out. DO NOT attemptto change a pin if it is engaged wi...

69-0574—2 12 Setting the Cooling Program: Decide when you want the temperature to reach the comfort level. Find the notch on thedial that’s one-half hour before this time andinsert a blue pin. The half-hour head start gives the air conditioner time to cool the housebefore you wake up or arrive home....

13 69-0574—2 Start Or End Programs With Manual ProgramAdvance Button IMPORTANT: To prevent damage to the program advance mechanism, DO NOT use theprogram advance button within a 30-minuteperiod before or after a program change. The manual program advance button enables immediate, one-time-only progr...

69-0574—2 14 Troubleshooting Your Honeywell thermostat requires little or no attention. Most problems can generally be traced to the following: Problem Check Action No heat. — system switch. May be in OFF or COOL position. Move system switch to HEAT position. — fuse or circuit breaker. If blown or t...

21 69-0574—2 Troubleshooting (continued) 1 Not applicable on model used in heating-only system. 2 Not applicable on model used in cooling-only system. 3 If clock is not battery powered, clock may still use batteries for backup. If this Troubleshooting section has not solved the problem, call your qu...

69-0574—2 22 Voltage At Clock Terminals AC Voltge at C-C Terminals Check Action 0 Vac. 1. System power off.2. Short in clock power supply wiring. 3. Limit switch contacts stuck open.4. Transformer supplying power is burned out. 1. Restore power.2. Replace wiring.3. Free or replace limit switch.4. Re...

23 69-0574—2 Servicing The Thermostat Cycle Rate Adjustment The equipment should cycle on and off just enough to keep the room temperature close tothe temperature lever settings. If the thermostat seems to cycle the heating system too fast or too slow, adjust the cyclerate by moving the anticipator ...

69-0574—2 24 Thermometer Adjustment The thermometer has been accurately calibrated at the factory and should only need adjust- ment if it has been dropped or mishandled. If the set point lever and the thermometer reading do not agree, follow the procedure below.Remove thermostat cover and open the f...

27 69-0574—2 Limited One-Year Warranty Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a periodof one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the pro...