X-XX UL
INSTALLATION INSTRUCTIONS
Copyright © 1995 Honeywell Inc. • All Rights Reserved
T827B
Heating Thermostat
APPLICATION
The T827B thermostat is for 24 Vac spst control of
heating-only systems.
Heat anticipation is fixed. The current rating is stamped on
the thermostat. The T827B has an adjustable heat
anticipator rating of either 0.18A to 0.8 A or 0.32A to 1.2A
at 30 Vac (depending on model). See Fig. 1.
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
Disconnect power supply before beginning
installation to prevent electrical shock or equipment
damage.
Location
Locate the thermostat about 5 ft (1.5m) above the floor in
an area with good air circulation at room temperature.
Do not mount 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 is a precision instrument. Rough handling can
decrease its accuracy.
Handle it carefully.
M8502A
MOUNTING HOLES
(THERMOSTAT
TO WALL OR
OUTLET BOX)
TEMPERATURE
SETTING LEVER
MOUNTING CLIPS
(2) (FOR COVER)
SNAP SWITCH
CONTACTS
ADJUSTABLE HEAT
ANTICIPATOR
SCALE
MOUNTING
POSTS (4)
(FOR COVER)
ADJUSTABLE
HEAT
ANTICIPATOR
INDICATOR
LEVER
.3
.6
.8
.4
.1
BIMETAL ELEMENT
BEHIND HEAT
ANTICIPATOR SCALE
Fig. 1. Internal view of T827B with adjustable heat
anticipator.
Wiring and Mounting
All wiring must comply with local codes and ordinances.
쐃
In replacement applications, inspect the old wiring
for frayed or cracked insulation. Replace any wires
in poor condition. In new installations, run two wires
to the chosen location.
쐇
Grasp the thermostat cover on the sides with one
hand. Pull outward on the left edge of the cover until
it snaps free of the thermostat base. Remove and
discard the shipping tab that protects the switch
contacts during shipping.
쐋
Connect the thermostat wires to the appropriate
terminals on the back of the thermostat. See Fig. 2
for typical hookup. Push any excess wire back
through the hole and plug any opening to prevent
drafts that can affect thermostat performance.
쐏
Adjust the heat anticipator to match the current draw
of the primary control in the system. See Heat
Anticipator Setting section.
69-0974
