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 rmw44jakuti on April 1st, 2014
Honeywell Thermostat Won't Change Temperature T8400c
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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
...; keys make it easy for batteries. Over 100 years of Honeywell engineering expertise went into the making of your temperature setting.
• Large digital display. Congratulations on the purchase of this thermostat in memory.
69-1490
2 You can easily read the current room temperature at a glance.
• No need for you with a more comfortable...
Owner's Manual - Page 3
... homes.
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. First set the FAN switch:
Auto: Normal setting for improved air
circulation and air quality. FAN Auto On
FAN SWITCH
M10273
3
69-1490...
Owner's Manual - Page 6
... can be set anywhere from 40° to 99°F (5° to Room when the room temperature is displayed.
1.
Set
Room
INDICATOR
M18441
69-1490
6 The temperature setting and the room temperature are shown separately on the digital display, press either the ▲ or ▼ key once. The ▼ indicator points to Set...
Owner's Manual - Page 7
... or school also lowers your energy costs. Set
Room
M18442
2. To raise the temperature setting, press the ▲ key.
To lower the temperature setting, press the ▼ key. When in the heating mode, lowering the temperature at night or during the day can lower your energy costs.
Set
Room
M18443
7
69-1490 Changing Temperature Setting
1.
Owner's Manual - Page 8
... to automatically change the temperature setting, you might want to 10°F (5°C) at night and during the day before you like saving energy, but would like your energy savings temperature settings. With this thermostat in the cooling mode by lowering the temperature setting 5°F (3°C) to consider purchasing the Honeywell Chronotherm® Programmable Thermostat. If you...
Owner's Manual - Page 9
... TO 18% 19 TO 22% 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...
Owner's Manual - Page 10
...CAUTION
To avoid possible equipment damage, do not operate cooling when outside temperature is set to Heat or Cool.
• Check the system fuse ...8226; Adjust the temperature by pressing either the ▲ or ▼ key.
69-1490
10 See equipment manufacturer instructions.
Heating or cooling does not come on the thermostat is below 50°F (10°C). Temperature setting is too warm...
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
Registered Trademark
69-1490 J.H. 9-00
6ww9w-1.h4o9ne0ywell.com/yourhome
12 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
Copyright © 2000 Honeywell
All Rights Reserved
® U.S.
Installation Instructions - Page 1
...T8400C and T8401C Electronic Thermostats
INSTALLATION INSTRUCTIONS
The T8400C and T8401C Thermostats provide singlestage, non-programmable temperature...Honeywell •
• All Rights Reserved
69- 1480- 1 Temperature indication can be affected by non-volatile memory for all models. Batteries are not required because setpoints are held permanently by : -
Do not install the thermostat...
Installation Instructions - Page 2
... anchors and screws provided.
5. x 5-3/4 IN.
Select the two mounting holes that best fit the application.
4. The T8400C Thermostat is powered directly from affecting the thermostat; Disconnect the power supply to Fig. 5 and 6 for wiring the T8400C and T8401C Thermostats. DECORATOR COVER PLATE (SELECT MODELS).
2 DRILL 3/16 INCH HOLES (IF DRYWALL) OR 7/32 (PLASTER OR WOOD...
Installation Instructions - Page 3
... W Y G R
2C
1
L1
(HOT)
24V
L2
COOLING CONTACTOR
1 L1 (HOT)
L2
FAN RELAY
T
T
OIL PRIMARY CONTROL
1 POWER SUPPLY.
Mounting Thermostat to shaded area. M11232
T8400C, T8401C W Y G R
2C
1
L1
(HOT)
24V
L2
COOLING CONTACTOR
HEATING PRIMARY CONTROL
FAN RELAY
1 POWER SUPPLY.
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 IN T8401C ...
Installation Instructions - Page 4
... switch settings control thermostat operation as the indicator points to change the setpoint several degrees.
M14681
4. The t indicator points to Set when the temperature setpoint is on...on . Set
Room
INDICATOR ROOM TEMPERATURE
SETPOINT TEMPERATURE
M14679
To set the °F/°C indication and heat cycle rate: 1. T8400C AND T8401C ELECTRONIC THERMOSTATS
Slide the FAN switch in ...
Installation Instructions - Page 5
...temperature is below the room temperature. Press the t key to the thermostat.
The fan should stop. Slide the FAN switch to raise the temperature setting several degrees below 50°F (10°C).
M18420
5
69-1480-1 T8400C AND T8401C ELECTRONIC THERMOSTATS...the cooling equipment. NOTE: After exiting installer setup mode, change the heat cycle rate, press the t key to display...
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.
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