Johnson Controls T26 Series User Manual page 2

5. Hold this position and firmly
press the selected faceplate
onto the cover.
6. Replace the knob.
Adjustments
Models with an external knob
permit thermostat adjustment by
rotating the knob. The indicator
notch on the knob denotes the
thermostat dial setting.
For concealed dial models (with
cover removed), the dial setting
desired should be lined up with
the reference mark on the base
of the thermostat. This will put
the desired setting at a 9 o'clock
position when the thermostat is
held vertically. Dial settings on
the T26 heating and SPDT
thermostats indicate the point at
which contacts make to start the
heating system. Dial settings on
the T26J indicate the point at
which contacts make to start the
cooling system.
2 T26 Technical Bulletin
Range Stops
Note: Energy conservation
models have a factory fixed
limited range. The stops are not
field adjustable.
High range and low range stops
are an integral feature of the
standard thermostats. Stops
may be set in the following
manner.
High Range Stop
1. Set the dial to the maximum
stop setting desired.
2. Pull knob off of range
adjustment shaft.
3. Remove the thermostat
cover by loosening the
cover screw. Remove the
cover.
4. While holding the dial firmly
in position, depress tab "A,"
Fig. 4, and rotate clockwise
until the tab is against stop
"C."
5. Release the tab making
sure it fits into the nearest
notch. Notches in the dial
are approximately 2-1/2F°
(1.4C°) apart.
Low Range Stop
1. Follow the same steps as
outlined under "High Range
Stop" but rotate tab "B,"
Fig. 4, counterclockwise.
2. Replace the cover and
tighten the cover screw.
Assemble the knob. Rotate
the knob to the desired
operating setting.
Dial Locks
The high range stop and low
range stop can be set to keep
the dial from rotating. Rotate the
dial to the set point desired and
move both tabs to a position
against either side of stop "C" as
outlined in the "High Range
Stop" and "Low Range Stop"
paragraphs.
Calibration
The T26 thermostats are factory
calibrated and no field
calibration should be attempted.
Checkout Procedure
Before leaving the installation,
observe at least three complete
operating cycles to be sure that
all components are functioning
correctly.
Faceplates
Faceplates are available in
separate kits for on-the-job
installation. All plates have a
peel-off backing strip. The
faceplates are available in all
combinations shown in the
"Faceplate Selection Table."
Repairs and Replacement
Field repairs must not be made
except for the knob, cover and
mounting plate. For a
replacement thermostat or repair
parts, contact the nearest
Johnson Controls distributor.