Honeywell T8401C1015 Support Question
Honeywell T8401C1015 Support Question
Find answers below for this question about Honeywell T8401C1015 - Electronic Thermostat - 1 Heat/1Cool.Need a Honeywell T8401C1015 manual? We have 1 online manual for this item!
Question posted by xmwwang1964 on April 27th, 2014
Why Honeywell T8401c Thermostat Suddenly Quit Working
We have an T8401c thermostat that just suddenly quit working, no ac unit function'
Current Answers
Related Honeywell T8401C1015 Manual Pages
Installation Instructions - Page 1
...or °C.
Do not install the thermostat where it carefully.
T8400C, T8401C Electronic Thermostats
INSTALLATION INSTRUCTIONS
The T8400C and T8401C Thermostats provide singlestage, non-programmable temperature control for 24V heating-cooling systems with manual changeover from ducts. -
The T8400C and T8401C models include a thermostat, wallplate (for operation. After installation is...
Installation Instructions - Page 2
...terminal is the correct setting for typical wiring hookups.
either method is an electric heat system, set the switch to the shaded area. Fan operation (fuel) switch.
.... 4. Mounting wallplate to wire the T8400C and T8401C Thermostats. Wiring
WALL 1
WALL ANCHORS (2)
IMPORTANT Use an 18-gauge maximum wire to wall. T8400C, T8401C ELECTRONIC THERMOSTATS
YES NO
NO 5 FEET
[1.5 METERS]
NO
...
Installation Instructions - Page 3
...
24
W
B Y
O
1
L1 (HOT) L2
FAN RELAY
3
COOL DAMPER
3
HEAT DAMPER
COMPRESSOR CONTACTOR
HEAT RELAY
1 L1 (HOT)
L2
COOLING TRANSFORMER
HEATING TRANSFORMER
1 POWER SUPPLY. G
Rc
2
R
W
B
Y
O
COOLING CONTACTOR
1
L1
(HOT)
24V
L2
HEATING PRIMARY CONTROL
FAN RELAY
1 POWER SUPPLY. T8400C, T8401C ELECTRONIC THERMOSTATS
KEEP WIRING IN SHADED AREA
G
Rc
R
W B
Y O
MOUNTING SCREW HOLE...
Installation Instructions - Page 4
... the cooling equipment. Typical hookup of the thermostat to select the desired fan setting.
69-1740
4
Mounting Thermostat to latch. See Fig. 11. M20882
Fig. 10. Auto: Normal setting for improved air circulation and air quality.
T8400C, T8401C ELECTRONIC THERMOSTATS
G C
R
W
B
Y
O
1
L1
(HOT)
24V
L2
TRANSFORMER
HEAT RELAY
COOL RELAY
FAN RELAY
1 POWER SUPPLY...
Installation Instructions - Page 5
...
Set
Room
ROOM TEMPERATURE
SETPOINT TEMPERATURE
M14679
To set the °F/°C indication, the heat cycle rate and the C3/C1 temperature control:
1.
INCREASE SETTING DECREASE SETTING
T8400C, T8401C ELECTRONIC THERMOSTATS
3. See Fig. 12. 2. SYSTEM Switch
System switch settings control thermostat operation as the indicator points to Set and flashes. Slide the SYSTEM switch in...
Installation Instructions - Page 6
... when the desired rate is shown, but information displayed varies by model) is displayed. M18419A
8. Heating equipment should start . Slide the SYSTEM switch to Cool and the FAN switch to equipment manufacturer's instructions.
10. T8400C, T8401C ELECTRONIC THERMOSTATS
NOTE:
In installer setup mode only, each press of the ▼ key momentarily displays 02. Each...
Installation Instructions - Page 7
... should shut down. When using an electric heat thermostat, the fan starts and stops with the cooling equipment.
T8400C, T8401C ELECTRONIC THERMOSTATS
Fan
1. In cooling, the fan starts and stops with the heating equipment. In heating, the fan is controlled directly by the heating equipment and may start a few minutes after the heating equipment turns on (on most systems...
Installation Instructions - Page 8
Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North
35 Dynamic Drive
Golden Valley, MN 55422
Scarborough, Ontario
M1V 4Z9
69-1740 J.S. 6-04
www.honeywell.com/yourhome Automation and Control Solutions
Honeywell International Inc.
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