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T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS
3 68-0180-3
Fig. 1. T8400/T8401 Thermostat dimensions in in. (mm).
Fig. 2. T8424 Thermostat dimensions in in. (mm).
INSTALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous condi-
tion.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced service techni-
cian.
4. After installation is complete, check out product opera-
tion as provided in these instructions.
CAUTION
Disconnect power supply before beginning wiring
to prevent electrical shock or equipment damage.
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old control
in the trash. Dispose of it properly.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of the control. If you have questions, call the
Honeywell Customer Response Center at
1-800-468-1502.
M10283A
UP
W
Y
G
R
C
FAN SYSTEM
Auto On
Cool Off Heat
1-1/2
(37)
2-1/2 (64)
2-7/8 (78)
3-1/2 (89) 1-3/16
(55)
2-7/8
(78)
3-1/2
(89)
WALLPLATE THERMOSTAT
THERMOSTAT
AND WALLPLATE
Set
Room
Set
Room
M18585
FAN SYSTEM
Auto On
Cool Off Heat Em. Ht.
5-1/2 (140)
1-3/16
(55)
3-1/2
(89)
2-3/8
(70)
THERMOSTAT
4-3/8 (111)
WALLPLATE
THERMOSTAT
AND WALLPLATE
3-5/16 (84)