Johnson Controls T26 Series User Manual

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Installation Sheets Manual 121
Room Thermostats Section T
Technical Bulletin T26
Issue Date 0692
© 1992 Johnson Controls, Inc.
1
Code No. LIT-121635
Form 996-49-6
T26 Series Line Voltage Thermostats
Heating, Cooling, Combination
Heating and Cooling
Application
The T26 Series line voltage
thermostat controls heating, cooling
or year round air conditioning units
in commercial, industrial or
residential installation.
All Series T26 thermostats are
designed for use
only
as
operating controls. Where an
operating control failure would
result in personal injury and/or
loss of property, it is the
responsibility of the installer to add
devices (safety, limit controls) that
protect against, or systems (alarm,
supervisory systems) that warn of,
control failure.
Installation
Location
The thermostat should be
mounted 4 to 5 feet above the
floor in a location where it will be
subjected to and affected by
average room temperature. Do
not mount the thermostat where it
may be affected by heat from
lamps, sunlight, fireplaces,
registers, radiators, pipes, etc., or
by cold from windows, doors,
registers, pipes, etc.,
Wiring
Make all wiring connections using
copper conductors only, and in
accordance with the National
Electrical Code and local
regulations. Loads exceeding the
rating of the thermostat can be
handled with a relay or motor
starter.
!
WARNING: Disconnect the
power supply before wiring
connections are made to
avoid possible electrical
shock or damage to the
equipment.
Mounting
The thermostats are supplied with
factory installed vertical faceplates.
If horizontal mounting is desired, a
faceplate to convert from vertical
mounting is packed with the
thermostat for on-the-job
installation. If any other version is
desired (concealed adjustment,
less thermometer, etc.) separate
faceplate kits are available for on-
the-job installation.
The following procedure should be
followed in the installation. Do not
remove the thermostat cover to
install. All wiring and mounting can
be completed without removing the
cover. The terminal identifications
are located under the mounting
plate at the back of the thermostat.
(See Fig. 5.)
1. Select the proper mounting
location.
2. Install a 2 in. × 3 in. vertical or
horizontal (as required) outlet
box.
3. Run the wire in a conduit or BX
to the 2 in. × 3 in. outlet box. A
standard shallow switch and
receptacle box can be used
where surface mounting and
exposed conduit wiring are
necessary, such as on a
concrete or brick wall. Allow
about 6 inches of wire for
connections to the thermostat
terminals.
4. Remove the mounting plate,
see Figs. 2 and 3, and fasten
the plate to the outlet box with
the screws provided in the
mounting plate.
5. Make the necessary wiring
connections to the electrical
terminals at the rear of the
thermostat. (See Typical
Application Diagrams.) Use
the terminal screws supplied
(8-32 × 1/4 in. binder head).
Substitution of other screws
may cause problems in
making proper connections.
6. Hook the two slots in the
back of the thermostat over
the formed prongs on the
mounting plate and swing
the thermostat into position
against the mounting plate.
7. Tighten the mounting plate
locking screw. (See Figs. 2
and 3.)
Optional Faceplate Installation
1. Mount the thermostat.
2. Pull knob off of range
adjustment shaft.
3. Peel off the backing strip
from the selected faceplate.
4. Position the plate over the
factory installed plate with
one long edge and two
corners aligned straight and
even with the installed plate.
Fig. 1 -- T26 Thermostat with
horizontal faceplate (top) or
vertical faceplate (bottom).