Table of Contents
Advertisement
The T-4000 Series Pneumatic
Room Thermostats are factory
calibrated to the values specified
in Table 1. If these settings are
suitable to the application, no
adjustments need to be made. If
different settings are required,
turn the set point dial to the
desired value.
If the room temperature is out of
control, determine the cause of
the problem. Possible causes
not involving the thermostat are
listed below.
1.
Check for proper operation
of the controlled device.
*
This bulletin provides adequate instructions for making basic adjustments to
T-4000 series room thermostats. For more detailed information, contact the local
branch office.
© 1984 Johnson Controls, Inc.
Code No. LIT-7171089X
T-4000 Series Room Thermostat
Adjusting Instructions*
2.
Check to see if the controlled
medium (water, for example)
is hot or cold enough to
maintain the desired
temperature.
3.
Check for unusual or
extreme loads in the space
which may overcome the
efforts of the thermostat to
maintain control.
If it is determined that the
thermostat is out of adjustment,
follow the appropriate instructions
to recalibrate the instrument.
Pneumatic Control Manual 717.1
Room Devices Section
Technical Bulletin T-4000
Issue Date 0984
Sensitivity Adjustment
(See Fig. 1)
All T-4000 series thermostats
have an integral output pressure
test port. The newer high volume
output thermostats have a plug-in
test port fitting which accepts a
hypodermic needle test probe
and gage (X-200-140 and G-
2010-11). On older models, the
test port cap screw must be
removed to accept a screw-in
test gage (X-200-19). For these
units, a test port fitting (T-4000-
615) can be ordered. All low
volume output thermostats have
hypodermic needle test points.
For units that require a screw-in
gage, remember to replace the
test port cap screw after
adjustment.
The sensitivity of the T-4000
series instruments is factory set
at 2.5 PSI/F° (32 kPa/C°). It is
adjustable from 1 to 3 PSI/F°
(13 to 38 kPa/C°) for low volume
output thermostats and from .
75 to 4 PSI/F° (10 to 51 kPa/C°)
for high volume output
thermostats. (Sensitivity of the T-
4003 is fixed at 2.5 PSI/F°).
1.
Furnish the appropriate
supply pressure to the
instrument.
2.
Insert the appropriate gage.
3.
Note the output pressure.
Note: The output pressure
for T-4054 thermostats must
be within one of the two
control ranges (not within the
deadband range).
4.
For high volume output
thermostats, move the
sensitivity slider toward the
control port to increase or
away from the control port to
decrease the sensitivity. For
low volume output
thermostats, move the
sensitivity slider down to
1
Advertisement
Table of Contents
Related Manuals for Johnson Controls T-4002
Summary of Contents for Johnson Controls T-4002
- Page 1 This bulletin provides adequate instructions for making basic adjustments to sensitivity slider down to T-4000 series room thermostats. For more detailed information, contact the local branch office. © 1984 Johnson Controls, Inc. Code No. LIT-7171089X...
- Page 2 (21 kPa) output pressure. screw until the output Set the master pressure to pressure equals that value. T-4002 and T-4100 (See Fig. 1) 14 psig (98 kPa). For low volume output Insert the test gage. Turn the set point dial until...
- Page 3 Fig. 3: Back View of T-4054 Fig. 2: T-4054 Adjustments Turn the upper calibration If it is necessary to adjust this T-4054 Deadband and Set screw until the control pressure to meet application Point Adjustment pressure is in the middle of requirements, proceed as follows: (See Fig.
- Page 4 Turn the lower dial to the desired set point. The difference in the dial settings is now the deadband. Remove the test gage. T-4110 Set Point Adjustment (See Fig. 4) Tee the test gage into the output line. Furnish restricted supply air to the instrument.
- Page 5 pressure to the heating T-4600 Set Point apparatus is at the mid Adjustment spring range of the controlled device. The T-4600 is furnished with HEATING and COOLING labels. Turn the heating set point Apply each label to the dial to the desired set point. appropriate element to avoid error in calibration or hook up.
- Page 6 Increase the supply pressure Switchover Point to 20 psig and rotate the Adjustment for T-4506, upper dial to produce T-4516, and T-4756 approximately 15 psig on the output gage. The above thermostats are Set the supply pressure to factory set to switch from one the desired switchover point.
- Page 7 Notes T-4000 Technical Bulletin...
- Page 8 Notes Controls Group 507 E. Michigan Street P.O. Box 423 Milwaukee, WI 53202 Printed in U.S.A. 8 T-4000 Technical Bulletin...
Need help?
Do you have a question about the T-4002 and is the answer not in the manual?
Questions and answers