Instruction/ maintenance manual of the product T8090A Honeywell
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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.
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.
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.
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.
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.
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.
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.
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.
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.
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, Ontar.
An important point after buying a device Honeywell T8090A (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Honeywell T8090A yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Honeywell T8090A - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Honeywell T8090A you will learn all the available features of the product, as well as information on its operation. The information that you get Honeywell T8090A will certainly help you make a decision on the purchase.
If you already are a holder of Honeywell T8090A, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Honeywell T8090A.
However, one of the most important roles played by the user manual is to help in solving problems with Honeywell T8090A. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Honeywell T8090A along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
