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INSTALLATION INSTRUCTIONS
69-1535-3
T8665A Chronotherm
®
IV
Deluxe Programmable
Wireless Thermostat
APPLICATION
The T8665 Chronotherm® IV Wireless Thermostat
provides electronic control of 24 Vac heating and cooling
systems. It must be used with a W8665 Receiver
Module. Refer to Table 1 for a general description of the
thermostat. The T8665A Thermostats are battery-
powered.
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.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of the old thermostat.
INSTALLATION
Accessory Required (Not Included)
Select one of the receiver modules for your application:
— W8665A Receiver Module (RM) for single zone
applications.
— W8665E RF Zone™ Panel for up to three zones.
When Installing this Product...
1. Read these instructions carefully. Failure to follow
the instructions can damage the product or cause
a hazardous 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 completing installation, use these instructions
to check out the product operation.
Location
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 sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
Wallplate Installation
The thermostat can be mounted horizontally on the wall.
1. Position and level the wallplate (for appearance
only). The thermostat functions correctly even
when not level.
2. Use a pencil to mark the mounting holes. See Fig.
2.
3. Remove the wallplate from the wall and drill two
3/16 in. holes in the wall (if drywall) as marked. For
firmer material such as plaster, drill two 7/32 in.
holes.
4. Gently tap anchors (provided) into the drilled holes
until flush with the wall.
5. Position the wallplate over the holes.
6. Loosely insert the mounting screws into the holes.
7. Tighten the mounting screws.
Table 1. T8665A Thermostat Description.
T8665 System Changeover System Selection Fan Selection Comments
A Heat-Cool Automatic Heat-Off-Cool-Auto On-Auto System and fan
selections are entered at
keyboard.
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