User manual Honeywell T8401C

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T8400C and T8401C  
Electronic Thermostats  
The T8400C and T8401C Thermostats provide single-  
stage, non-programmable temperature control for 24V  
heating-cooling systems with manual changeover from  
heat to cool. Heating cycle rate is selectable at 1, 3, 4, 5,  
When Installing this Product…  
Temperature indication can be set for °F or °C.  
, or 9 cph. Cooling cycle rate is fixed at 3 cph.  
Read these instructions carefully. Failure to follow  
them could damage the product or cause a hazard-  
ous condition.  
Check the ratings given in the instructions and on  
the product to make sure the product is suitable for  
your application.  
The T8400C Thermostat is powered through the heating/  
cooling system controls. The T8401C Thermostat is  
powered directly from the system transformer. Batteries  
are not required because setpoints are held permanently  
by non-volatile memory for all models.  
Installer must be a trained, experienced service  
After installation is complete, check out product  
operation as provided in these instructions.  
All TRADELINE® models include a thermostat, wallplate  
(for wiring and mounting thermostat) and owner’s guide.  
The T8400C SUPER TRADELINE® model also includes  
two decorator cover plates for covering wallmarks.  
Electrical Shock or Equipment Damage  
Can shock individuals or short equipment  
Disconnect power supply before installation.  
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old  
control in the trash.  
Contact your local waste management authority  
for instructions regarding recycling and the  
proper disposal of an old control containing  
mercury in a sealed tube.  
Install the thermostat about 5 ft (1.5m) above the floor in  
an area with good air circulation at average temperature.  
See Fig. 1. Do not install the thermostat where it can be  
affected by:  
drafts or dead spots behind doors and in corners.  
hot or cold air from ducts.  
radiant heat from the sun or appliances.  
concealed pipes and chimneys.  
unheated (uncooled) areas such as an outside wall  
behind the thermostat.  
This thermostat is a precision instrument and was  
carefully adjusted at the factory. Handle it carefully.  
U.S. Registered Trademark  
Copyright © 2002 Honeywell •  
• All Rights Reserved  

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