Honeywell CHRONOTHERM III T8611M- Manuals

12 Installation COMPATIBILITY The T8611 Thermostats will replace most heat pump system thermostats. As long as ac power is continuouslyavailable to the thermostat, the thermostat will be compat-ible with almost any low-volt control system. WHEN INSTALLING THIS PRODUCT… 1. Read these instructions car...

13 68-0076—1 Fig. 4—Removing thermostat from subbase. The subbase mounts directly onto the wall with the screws and anchors included. Instead, the subbase can bemounted on a vertical or horizontal outlet box. If you mustmount the subbase on a vertical outlet box, order 193121AAdapter Assembly. The a...

15 68-0076—1 Fig. 7—Restrict wiring to recessed area surrounding terminals. T8611M INSTALLATION DENOTES THERMOSTAT TO SUBBASE INTERCONNECT. APPLICABLE ONLY ON MODEL WITH REMOTE SENSOR. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. POSSIBLE CHECK LED CIRCUITS: SOME OLDER...

18 Fig. 13—Mounting thermostat on subbase. Checkout ! CAUTION During cold weather, some heat pumps will re-quire that crankcase heater be energized severalhours before operating heat pump. Refer tomanufacturer’s recommendations. HEATINGNOTE: When heating setting is changed, thermostat will wait up t...

19 68-0076—1 System Press Look For This Response Switch This Key Position Key Down Key Released OFF 03 Blank 07 Blank 15 Blank COOL or 15 1st stage cooling, fan and AUTO SYSTEM LED on. (with fan 15 2nd stage cooling also on. in AUTO) 15 2nd stage cooling off. 15 1st stage cooling, fan and SYSTEM LED...

20 M5346 Third System Switch Sensor Digit Position Location 0 COOL, AUTO or OFF Local 1 HEAT or EM.HT. Local 4 COOL, AUTO or COOL Remote 5 HEAT or EM. HT. Remote Nominal Cycle Rate Fourth (cph at 50% load Digit for 3rd stage heat) 4 6 5 3 First Digit Degrees Clock (Hrs.) 0 F 12 1 F 24 2 C 12 3 C 24 ...

22 Press and release. The display showsNIGHT and the preprogrammed time andtemp-erature. Press and hold until the display shows thetime to start the energy saving period. Press and hold until the display shows thedesired heating temperature. Program the NIGHT time and tem-perature, if desired. Set t...

25 68-0076—1 Then set the system switch. (contin-ued) AUTO (select models only): The ther-mostat controls either the heating or cool-ing system, depending on room tempera-ture. COOL: The thermostat controls the cool-ing system. This completes the programming of thethermostat. If thermostat was remov...

26 REPROGRAMMING THETHERMOSTAT If schedule changes or a different tem-perature is desired, update any settingwithout affecting the rest of the pro-gram. Press and hold until the desired time periodshows on the display. Press and hold until the desired scheduleday shows on the display. Press and hold...

27 68-0076—1 Press and release to return to normaloperation. CHECKING THE PROGRAMTIMES AND TEMPERATURES If desired, check all the stored settings without affecting the permanent program. Press and hold until the desired period showson the display. The start time and tempera-ture setting will appear ...

28 the auxiliary heat even when the T8611 is calling for it.(Balance point is the outdoor temperature below which theheat pump must call on auxiliary heat to help handle theload.) The resulting unnecessarily long recovery timesreduce building energy savings. When Adaptive Intelligent Recovery™ Is Us...

29 68-0076—1 Troubleshooting HEAT PUMP OR AUXILIARY HEAT WON' T OPERATE NO ac POWER TO THERMOS TAT CHECK POWER TO HEAT PUMP OR AUXILIARY HEATING S YS TEM –ON-OFF S WITCH–FUS E OR CIRCUIT BREAKER–LOOS E 24 V CONNECTION -AT THERMOS TAT -AT HEAT PUMP OR AUXILIARY HEATING S YS TEM –INCORRECT WIRING -CHE...

30 conditioning equipment to return the building from theenergy saving temperature to the comfort temperature.The thermostat starts the recovery period early so thebuilding will be at the comfort setting by the time theowner has chosen. SetbackReducing the temperature in the building for a set perio...

31 68-0076—1 T8611M TABLE OF CONTENTS Table of Contents Page Specifications .................................................................................................................................................................... 2 Ordering Information .......................................