X-XX UL
INSTALLATION INSTRUCTIONS
Copyright © 1996 Honeywell Inc. • • All Rights Reserved
T8501A,B,C,D
Microelectronic Thermostats
APPLICATION
The T8501 Microelectronic Thermostat provides electronic control of 24 Vac single-stage heating and cooling systems.
Refer to Table 1 for a general description of the thermostat. All T8501 Thermostats require a common wire to supply
power.
Table 1. Description of T8501 Thermostats.
RECYCLING 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
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.
T8501
System
Changeover
System
Selection
Fan
Selection
Comments
A
Heat only
None
None
None
—
B
Heat only
None
Heat-Off
On-Auto
Select models have only a system switch or fan
switch and some models have both.
C
Heat-Cool
Manual
Heat-Off-Cool
On-Auto
System and fan selections are done by
switches.
D
Heat-Cool
Automatic
Heat-Off-Cool-Auto
On-Auto
System and fan selections are done by
keyboard.
CAUTION
Disconnect power supply to prevent electrical
shock or equipment damage.
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 or
on a 2 in. x 4 in. wiring box. Position wallplate horizontally
on the wall or on a 2 in. x 4 in. wiring box.
쐃
Position and level the wallplate (for appearance
only). The thermostat will function properly even
when not level.
69-0959
