Honeywell T8400C Installation Instruction

T8400C
Electronic Thermostat
The T8400C provides single-stage, non-programmable
temperature control for 24V heating-cooling systems with
manual changeover from heat to cool. Heating cycle rate
is selectable at t, 3, 4, 5, 6, 9, or 12 cph Cooling cycle
rate is fixed at 3 cph Temperature indication can be set
for °F
or °C
The T8400C Thermostat is powered through the heating/
cooling system controls. Batteries are not required
because setpoints are held permanently by non-volatile
memory
T8400C models include a thermostat, wallplate and
owner's guide
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
controt 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
INSTALLATION
When Installing this Product...
1, Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition
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
technician
4, After installation is complete, check out product
operation as provided in these instructions
CAUTION
Electrical Shock or Equipment Damage
Hazard,
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation
Location
_nstall 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 co{d 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
Mounting Wallplate to Wall
IMPORTANT
Level only for appearance The thermostat func-
tions norFnally even when not level
NOTE: T8400C models include a thermostat and wall-
plate
Mount wallplate, T8400C. and the screws provided (see
Fig 2) as follows:
1. Place the wallplate at the desired location on
the wall
2. Pull the thermostat wire through the wallplate
entrance hole
3. Select the two mounting holes that best fit the
application
4. Fasten the wallpiate to the wall using the anchors
and screws provided
5. After widng the waHplate, plug the hole to prevent
drafts from affecting the thermostat; see Widng
section
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