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 fargofarm on March 2nd, 2012
Thermostat
temp is set on 73 -- thermostat shows 77 in the house and will not go below but it comes on and off
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
... held permanently in an effort to provide you to use. 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 temperature setting.
• Large digital display. The ▲ and ▼ keys make it easy for batteries. You can...
Owner's Manual - Page 3
.... Use for most homes. In cooling, the
fan goes off and on .
In heating, the fan may start a few minutes after
the heating equipment comes on with the cooling 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...
Owner's Manual - Page 4
... months when your home
needs cooling (air conditioning). SYSTEM Cool Off Heat Em.Ht.
Digital display shows a flame
when heating is on all models.) Switch to this
setting when your home needs heat, but your home
needs heating.
SYSTEM SWITCH
M10274
69-1490
4 Off:
Both heating and cooling are off. Em.
Ht...
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 and Aux Ht Indications
Emergency Heat (Em Ht) and Auxiliary Heat (Aux Ht) indications are active.
Em Ht: Aux Ht...
Owner's Manual - Page 6
...°F (5° to Room when the room temperature is displayed.
1.
The ▼ indicator points to Set when the temperature setting is displayed and to 37°C).
To display the temperature setting on the digital display. The temperature setting and the room temperature are shown separately on the digital display, press either the ▲ or...
Owner's Manual - Page 7
... energy costs.
When in the heating mode, lowering the temperature at night or during the day can lower your energy costs. To lower the temperature setting, press the ▼ key. Set
Room
M18442
2.
Set
Room
M18443
7
69-1490 To raise the temperature...
Owner's Manual - Page 8
... you leave for work or school. You can also save energy in the heating mode by raising the temperature setting during the day. Energy Savings
You can save energy with this thermostat, temperature settings can be as high as 7% to 33% depending on your home, where you live, the number of energy saving...
Owner's Manual - Page 10
Heating or cooling does not come on the thermostat is set to Heat or Cool.
• Check the system fuse or circuit breaker... equipment.
• Adjust the temperature by pressing either the ▲ or ▼ key.
69-1490
10
Temperature setting is below 50°F (10°C).
See equipment manufacturer instructions. Troubleshooting Guide
CAUTION
To avoid possible equipment damage, do...
Owner's Manual - Page 11
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.
For service, contact your local heating and cooling contractor:
11
69-1490
Installation Instructions - Page 1
... tube, do not place your old control in these instructions carefully. The T8400C Thermostat is powered directly from heat to cool. INSTALLATION
When Installing this control is... TRADELINE® models include a thermostat, wallplate (for °F or °C. MERCURY NOTICE
If this Product...
1.
Handle it can be set for wiring and mounting thermostat) and owner's guide. Registered ...
Installation Instructions - Page 2
Mounting Decorator Cover Plate and Wallplate to Wall
IMPORTANT Level only for typical wiring hookups.
5-3/4 IN. See Fig. 4. The T8400C Thermostat is powered through the heating/ cooling system controls and is adaptable to most 4-wire, 18 to the wall using the anchors and screws provided.
5. x 5-3/4 IN. ...
Installation Instructions - Page 3
...: The fan runs continuously. Auto: Normal setting for improved air circulation and air quality.
Set
Room
Set
Room
FAN Auto On
SYSTEM Cool Off Heat
FAN Auto
SYSTEM Cool Off Heat
A ENGAGE TABS AT TOP
OF THERMOSTAT WITH SLOTS ON WALLPLATE. Restrict wiring to latch. M11022B
Fig. 6. M11232
T8400C, T8401C W Y G R
2C
1
L1
(HOT)
24V
L2...
Installation Instructions - Page 4
... setpoint and the room temperature are off , t turns it off . 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 the bottom left corner of the thermostat to test heat or cool outputs. Off: Both heating and...
Installation Instructions - Page 5
... information is displayed. In cooling, the fan starts and stops with the heating equipment.
T8400C AND T8401C ELECTRONIC THERMOSTATS
10.
If the desired cycle is below 50°F (10°C). To change the setpoint to raise the temperature setting above the room temperature.
After approximately ten seconds, the heating equipment should stop. Heating...
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