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Question posted by jojwillen on December 31st, 2017

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Is the Honeywell T8400C 1099 thermostat still available or is there a direct replacement

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Answer #1: Posted by BusterDoogen on December 31st, 2017 3:17 PM

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Yes, go here for the thermostat.

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Answer #2: Posted by anis0012 on December 31st, 2017 10:32 AM

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You can find it on eBay

https://www.ebay.com/i/273000704888?rt=nc

Related Honeywell T8400C Manual Pages

Owner's Manual - Page 1

Set Room FAN Auto On SYSTEM Cool Off Heat M18535 Em Ht Aux Ht Set Room Electronic Thermostat OWNER'S GUIDE FAN Auto On SYSTEM Cool Off Heat Em.Ht. M18539 1 69-1490 69-1490

Owner's Manual - Page 2

Congratulations on the purchase of this thermostat in memory. 69-1490 2 Over 100 years of Honeywell engineering expertise went into the making of your new thermostat! Batteries are not required because your temperature setting. • Large digital display. You can easily read the current room temperature at a glance. • No need ...

Owner's Manual - Page 3

... equipment. Settings Setting FAN and SYSTEM Switches Fan and system settings are controlled by using FAN and SYSTEM switches located on the bottom of the thermostat case. On: The fan runs continuously. FAN Auto On FAN SWITCH M10273 3 69-1490 Use for most homes.

Owner's Manual - Page 4

... SYSTEM switch: Cool: Normal setting for months when your home needs heating. Em. Digital display shows a flame when heating is not working properly. Ht.: (Not available on all models.) Switch to this setting when your home needs heat, but your home needs cooling (air conditioning). SYSTEM Cool Off Heat Em.Ht...

Owner's Manual - Page 5

... Ht. INDICATOR Em Ht Set Room M18425 5 69-1490 The ▲ indicator points to either Em Ht or Aux Ht when these modes are not available on all models. Em Ht and Aux Ht Indications Emergency Heat (Em Ht) and Auxiliary Heat (Aux Ht) indications are active.

Owner's Manual - Page 8

... of energy saving periods you might want to consider purchasing the Honeywell Chronotherm® Programmable Thermostat. Energy Savings You can save energy with this thermostat, temperature settings can be as high as 7% to 33% ...depending on your energy savings temperature settings. With this thermostat in the cooling mode by lowering the temperature setting 5°F (3°C) ...

Owner's Manual - Page 10

...do not operate cooling when outside temperature is set to Heat or Cool. • Check the system fuse or circuit breaker and replace or reset if necessary. • Check for air movement at the register. • Check power to the heating or cooling ...; key. 69-1490 10 See equipment manufacturer instructions. Heating or cooling does not come on the thermostat is below 50°F (10°C).

Owner's Manual - Page 11

For service, contact your local heating and cooling contractor: 11 69-1490 If you have questions concerning this thermostat, call Honeywell Customer Assistance at 1-800-468-1502, Monday-Friday, 7:00 am-5:30 pm, Central time.

Owner's Manual - Page 12

Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 Copyright © 2000 Honeywell All Rights Reserved ® U.S. Registered Trademark 69-1490 J.H. 9-00 6ww9w-1.h4o9ne0ywell.com/yourhome 12 Automation and Control Solutions Honeywell International Inc.

Installation Instructions - Page 1

... an old control containing mercury in corners. - Registered Trademark Copyright © 2002 Honeywell • • All Rights Reserved 69- 1480- 1 Cooling cycle rate is powered directly from heat to cool. See Fig. 1. The T8401C Thermostat is fixed at 3 cph. The T8400C Thermostat is replacing a control that contains mercury in a sealed tube, do not place your old...

Installation Instructions - Page 2

... at the desired location on the left side of thermostat, restrict all wiring to Wall IMPORTANT Level only for wiring the T8400C and T8401C Thermostats. Select the two mounting holes that best fit the... cover plate, then through the heating/ cooling system controls and is powered directly from affecting the thermostat; After wiring the wallplate, plug the hole to prevent drafts from the ...

Installation Instructions - Page 3

... fan is controlled directly by using an electric heat thermostat, the fan starts and stops with the cooling equipment. M11022B Fig. 6. Fig. 7. Mounting Thermostat to shaded area. DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT G FOR WRAPAROUND STRIP 7/16 IN. (11 MM) R FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM) C TERMINAL SCREW Fig. 4. T8400C/T8401C heat...

Installation Instructions - Page 4

...or Cool by sliding the SYSTEM switch in the bottom right corner of the thermostat to select the desired fan setting. To display the temperature setpoint on the ... and cooling are no longer displayed. 69-1480-1 4 To set temperature setpoint: 1. T8400C AND T8401C ELECTRONIC THERMOSTATS Slide the FAN switch in °C, set the temperature setpoint to 11°C. The temperature...

Installation Instructions - Page 5

.... (This information is for factory use only. A typical example is displayed. T8400C AND T8401C ELECTRONIC THERMOSTATS 10. To change the setpoint to C1 or C3. Stop scrolling when the... 69-1480-1 This information is controlled directly by model. NOTE: After exiting installer setup mode, change the heat cycle rate, press the t key to Auto, if available. 2. See Table 1 for the ...

Installation Instructions - Page 6

Rev. 2-02 www.honeywell.com/yourhome Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-1480-1 G.H.