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Honeywell T8090A manual

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Table of contents for the manual

  • Page 1

    1 69-0750—1 T8090A Heating, Cooling, and Heating-Cooling Thermostat, W allplate and Sub base D.F. • Rev. 10-94 • • ©Honeywell Inc. 1994 • Form Number 69-0750—1 Prepar ation Check thermostat and subbase (if used) suitability for the heating, cooling, or heating/cooling system. Refer to Table 1. Assemble tools required: flat bladed screw[...]

  • Page 2

    69-0750—1 2 M3375 Recycling Notice This control contains mercury in a sealed tube. Do not place control in the trash at the end of its useful life. If this control is replacing a control that contains mer- cury in a sealed tube, do not place your old control in the trash. Contact your local waste management authority for instructions regarding re[...]

  • Page 3

    3 69-0750—1 Fig. 2—Mounting wallplate or subbase to wall. Fig. 3—Leveling methods for wallplate or subbase. Fig. 4—Mounting wallplate or subbase on horizontal outlet box. M1552A AUTO OFF COOL HEAT ON FAN R G O W Y B 3 SCREW HOLES WITH PLASTIC ANCHORS HEATING/COOLING SUBBASE 3 SCREW HOLES WITH PLASTIC ANCHORS HEATING-ONLY WALLPLATE M857 AUTO[...]

  • Page 4

    69-0750—1 4 WIRING Follow the instructions provided by the heating, cooling or heating-cooling equipment manufacturer. If not avail- able, refer to the Typical Wiring Diagrams section. Disconnect power supply before making wiring connec- tions to prevent electrical shock or equipment damage. NOTE: All wiring must comply with local electrical code[...]

  • Page 5

    5 69-0750—1 Adjust the heat anticipator lever to match the current rating of the primary control for the proper cycle rate (Fig. 9). Set adjustable anticipation for total current of heat and fan control. Locate the current rating stamped on the control or valve (Fig. 10), or the setting given in the device instructions. If no current rating or he[...]

  • Page 6

    69-0750—1 6 Remove the thermostat from the wallplate or subbase. Connect an ac ammeter of appropriate range (about 0A to 2A) between the R and W terminals on the wallplate or subbase except for electric heat and heat pump systems. Let the system operate for one minute. Adjust the heat anticipator lever to match the number that reads on the ammete[...]

  • Page 7

    7 69-0750—1 THERMOSTAT This thermostat was calibrated at the factory and should not need recalibration in the field. If recalibration seems necessary, first be sure wallplate or subbase is accurately leveled. Then check thermometer calibration. To check thermostat calibration, allow several hours of operation after installation. Then read the the[...]

  • Page 8

    69-0750—1 8 Fig. 14—Use of 104994A calibration wrench. .35 .30 .25 .20 .10 M8583 ANTICIPATOR SETTING LEVER ANTICIPATOR SCALEPLATE CALIBRATION WRENCH T ypical W iring Diagrams Fig. 15—Typical hookup for clock powered by separate 24 Vac transformer. L1 (HOT) L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. C C [...]

  • Page 9

    9 69-0750—1 L1 (HOT) L2 1 1 L1 (HOT) L2 1 HEAT RELAY COMPRESSOR CONTACTOR CLOCK POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER POWERS BOTH HEATING AND COOLING. FOR POWER STEALING ON HEATING, JUMPER C-RC AND C-Y TERMINALS. 2 3 3 2 THERMOSTAT BATTERY SUBBASE CC R H RC WY M720A[...]

  • Page 10

    69-0750—1 10 Automation and Control Solutions Honeywell International Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9[...]