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Honeywell T8424C Manuel D’Utilisation

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T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS
68-0180-3
2
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the 
TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or 
phone:
1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Relations
Honeywell, 1985 Douglas Drive North
Golden Valley, Minnesota 55422  (800) 468-1502
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, 
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
SPECIFICATIONS
IMPORTANT
The specifications given in this publication do not 
include normal manufacturing tolerances; therefore, 
an individual unit might not exactly match the listed 
specifications. Also, this product is tested and cali-
brated under closely controlled conditions, and some 
minor differences in performance can be expected if 
those conditions are changed.
T8400C, T8401C, T8424C,D TRADELINE® models include a 
thermostat, wallplate for wiring and mounting thermostat and 
owner’s guide. 
T8400C, T8401C SUPER TRADELINE® models include a 
thermostat, wallplate (for mounting and wiring thermostat), 
two decorator cover plates for covering wall marks (3-7/8 in. x 
3-7/8 in. and 5-3/4 in x 5-3/4 in.), and owner’s guide.
Power:
T8400C: 24 Vac nominal, 18 to 30 Vac, 50/60 Hz.
T8401C: 24 Vac nominal, 18 to 30 Vac, 50/60 Hz.
T8424C,D: 24 Vac nominal, 18 to 30 Vac, 50/60 Hz.
Electrical Ratings:
Heating: .02 to 1.5A run; 3.5A inrush.
Cooling: .02 to 1.5A run; 7.5A inrush.
Fan: .02 to 0.5A run; 2.5A inrush.
Current Draw:
T8400C Power Stealing Thermostat requires less than 
0.25 mA current draw when the thermostat calls for heat 
and is compatible with most 24V microprocessor systems. 
The T8400C Power Stealing Thermostat can be used in 
any non-millivolt application where the T8401C and 
T8424C,D Hard Wired Thermostats cannot be used. For 
further detail, see Power Stealing in the Operation section.
Temperature Adjustment:
Setpoint temperature is adjusted by using the ▲ or  ▼ 
keys. One press changes the setpoint one degree; press-
ing and holding changes the setpoint several degrees.
Temperature Setting Range: 40°F (4°C) to 99°F (37°C).
Ambient Temperature Range: 40°F (4°C) to 110°F (43°C).
Shipping Temperature Range: -20°F (-29°C) to 120°F 
(49°C).
Operating Relative Humidity: 5% to 90% RH, non-
condensing.
Cycle Rates (at 50% Load):
Heating: Selectable at 1, 3, 4, 5, 6, 9 or 12 cph. See Table 
1 for cycle rate options and corresponding system 
equipment.
Cooling: Fixed at 3 cph.
Table 1. Heating Cycle Rates.
a
High efficiency furnace.
b
Refer to equipment manufacturer’s instructions.
Finish:
T8400C, T8401C and T8424C,D TRADELINE® AND SUPER 
TRADELINE®: Taupe finish.
T8400C, T8401C and T8424C,D STANDARD MODELS: 
Premier White® finish and only available in builder packs of 
20.
Accessory: Decorator cover plates (for covering wall marks): 
5-3/4 in. x 5-3/4 in. and 3-7/8 in. x 3-7/8 in. 
Dimensions: See Fig. 1 or 2.
System
Cycles Per Hour
Steam, gravity
1
Hydronic heat, condensing 
gas furnaces
a
3
Special applications
b
4, 5
Gas or oil forced air (default) 
6
Electric heat
9
Special applications
b
12