Honeywell T8400C Support Question
Honeywell T8400C Support Question
Find answers below for this question about Honeywell T8400C.Need a Honeywell T8400C manual? We have 2 online manuals for this item!
Question posted by pvidwans02 on June 20th, 2012
Thermostat Setting
I have set the thermostat at 78 degrees but it reads 81 on the display, and the air continues to stay on. What is the problem?
Current Answers
Related Honeywell T8400C Manual Pages
Owner's Manual - Page 1
M18539
1
69-1490
69-1490 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.
Owner's Manual - Page 2
... on the purchase of this thermostat in memory.
69-1490
2 Over 100 years of Honeywell engineering expertise went into the making of your temperature settings are held permanently in an effort to provide you to use. You can easily read the current room temperature at a glance.
• No need for you with a more...
Owner's Manual - Page 3
... located on with the cooling equipment. In cooling, the
fan goes off and on the bottom of the thermostat case. On:
The fan runs continuously.
First set the FAN switch:
Auto: Normal setting for improved air
circulation and air quality. Use for most homes. In heating, the fan may start a few minutes after
the heating equipment...
Owner's Manual - Page 4
...
equipment has failed or is on. Em. SYSTEM SWITCH
M10274
69-1490
4
Digital display shows a flame
when heating is not working properly.
SYSTEM Cool Off Heat Em.Ht. Then set the SYSTEM switch:
Cool: Normal setting for months when your home
needs cooling (air conditioning).
Heat: Normal setting for months when your home
needs heating.
Owner's Manual - Page 5
... all models. The ▲ indicator points to Aux Ht when the living space needs auxiliary backup heat to Em Ht when the SYSTEM switch is set at Em Ht. Em Ht: Aux Ht:
The ▲ indicator points to help handle the heating load.
INDICATOR
Em Ht...
Owner's Manual - Page 6
The ▼ indicator points to Set when the temperature setting is displayed and to 37°C). Set
Room
INDICATOR
M18441
69-1490
6
Displaying Temperature Setting
NOTE: Your temperature setting can be set anywhere from 40° to 99°F (5° to Room when the room temperature is displayed.
1. The temperature setting and the room temperature are shown separately on the digital...
Owner's Manual - Page 7
... the heating mode, lowering the temperature at night or during the day can lower your energy costs.
To raise the temperature setting, press the ▲ key. To lower the temperature setting, press the ▼ key. When in the cooling mode, raising the temperature before you leave for work or school also lowers...
Owner's Manual - Page 8
....
69-1490
8 Savings can be conveniently programmed to automatically save energy in the heating mode by raising the temperature setting during the day.
With this thermostat in the cooling mode by lowering the temperature setting 5°F (3°C) to 10°F (5°C) at night and during the day before you leave for work or...
Owner's Manual - Page 9
...% 23 TO 33%
COOL
* YOUR SAVINGS DEPENDS ON HOME SIZE AND ACTUAL HEAT LOSS OR GAIN, GEOGRAPHIC LOCATION, FREQUENCY OF TEMPERATURES CHANGE, AND RANGE IN DEGREES OF CHANGE. M10278
9
69-1490
Owner's Manual - Page 10
... cooling does not come on the thermostat is below 50°F (10°C).
See equipment manufacturer instructions. Temperature setting is too warm or cool.
• Check that the SYSTEM switch on . Troubleshooting Guide
CAUTION
To avoid possible equipment damage, do not operate cooling when outside temperature is set to Heat or Cool.
•...
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.
Installation Instructions - Page 1
...was carefully adjusted at average temperature.
Installer must be set for °F or °C. concealed pipes and chimneys. - The T8400C Thermostat is powered directly from heat to cool. Batteries are ... Reserved
69- 1480- 1 Read these instructions. Location
Install the thermostat about 5 ft (1.5m) above the floor in corners. -
This thermostat is complete, check out product...
Installation Instructions - Page 2
...:
1. NOTE: Only SUPER TRADELINE® models have the cover plate. Mounting decorator cover plate and wallplate to Wall
IMPORTANT Level only for wiring the T8400C and T8401C Thermostats. x 5-3/4 IN. Disconnect the power supply to the wall using the anchors and screws provided.
5.
DECORATOR COVER PLATE
WALL
1 2
WALL ANCHORS (2)
Wiring
IMPORTANT Use an...
Installation Instructions - Page 3
... fan starts and stops with gas heat/electric
cooling.
Auto: Normal setting for improved air circulation and air quality. Mounting Thermostat to shaded area. Fig. 7. OPERATION
Setting FAN and SYSTEM Switches
Fan and system settings are : On: The fan runs continuously. FAN Switch
Fan switch settings are controlled manually by the heating equipment and may start a few minutes...
Installation Instructions - Page 4
... are off ; T8400C AND T8401C ELECTRONIC THERMOSTATS
Slide the FAN switch in °C, set the temperature setpoint to 11°C. Heat: The thermostat controls the heating ...thermostat to change the setpoint several degrees. if cool is displayed .
To increase the temperature setpoint press the s key. Set Temperature Setpoint
NOTE: Temperature setpoint range is on and off ; To display...
Installation Instructions - Page 5
... the FAN switch to Auto.
2.
Factory information is displayed. T8400C AND T8401C ELECTRONIC THERMOSTATS
10.
If the desired cycle is displayed. See Table 1 for factory use only. bRefer to raise the temperature setting above the room temperature. Press the s key to equipment manufacturer's instructions. Cooling system should run continuously.
2. The fan should shut down. In...
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