Heating Set Point Adjustment; Cooling Set Point Adjustment - Johnson Controls T-4002 Adjusting Instructions

T-4600 Set Point
Adjustment
The T-4600 is furnished with
HEATING and COOLING labels.
Apply each label to the
appropriate element to avoid
error in calibration or hook up.

Heating Set Point Adjustment

(See Fig. 6)
1. Insert the test gage.
2. Furnish restricted supply air
to the instrument.
3. Note the ambient
temperature in the space.
4. Turn the heating set point
dial to that temperature
(match it with the arrow).
T-4756 Set Point
Adjustment
Usually the heating set point is
made on the lower element with
a 15 psig (105 kPa) supply
pressure and the cooling set
point is made on the upper
element with a 20 psig (140 kPa)
supply pressure. If your
application is different, use the
proper element and supply
pressure for the particular
application. The T-4756 is
furnished with HEATING and
COOLING labels which can be
applied to the appropriate
element.
Heating Set Point Adjustment
(See Fig. 7)
1. Insert the test gage.
2. Furnish 15 psig supply
pressure for heating control
(lower dial).
3. Note the ambient
temperature in the space.
4. Turn the lower set point dial
to that temperature.
5. Turn the lower calibration
screw on the heating
element until the output
pressure is at the mid spring
range of the controlled
device.
6. Turn the lower set point dial
to the desired heating set
point.
5. Turn the calibration screw on
that element until the output
pressure to the heating
apparatus is at the mid
spring range of the
controlled device.
6. Turn the heating set point
dial to the desired set point.

Cooling Set Point Adjustment

Repeat the procedure for heating
adjustment on the other element.
Remember to use the other test
port and the proper value in step
5 for the mid spring range of the
controlled device.
Fig. 7: T-4756 Adjustments
Cooling Set Point Adjustment
1. Insert the test gage.
2. Furnish 20 psig supply
pressure for cooling control
(upper dial).
3. Note the ambient
temperature in the space.
4. Turn the upper set point dial
to that temperature.
5. Turn the upper calibration
screw on the cooling
element until the pressure is
at the mid spring range of
the controlled spring range
of the controlled device.
6. Turn the upper set point dial
to the desired temperature.
7. Restore the supply pressure
for the desired cycle.
T-4000 Technical Bulletin 5