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Pneumatic Control Manual 717.1

Room Devices Section

Technical Bulletin T-4000

Issue Date 0984

Code No. LIT-7171089X

T-4000 Series Room Thermostat

Adjusting Instructions*

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.

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.

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

This bulletin provides adequate instructions for making basic adjustments to

T-4000 series room thermostats. For more detailed information, contact the local

branch office.

Summary of content (8 pages)

PAGE 1
Pneumatic Control Manual 717.1 Room Devices Section Technical Bulletin T-4000 Issue Date 0984 T-4000 Series Room Thermostat Adjusting Instructions* 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.
PAGE 2
5. 6. 7. increase or up to decrease the sensitivity. 2. Set the master pressure to 4 psig (28 kPa). Check the output pressure. If it is different from the value found in step 3, turn the sensitivity slider adjusting screw until the output pressure equals that value. For low volume output (plastic body) instruments, use the output adjusting screw to adjust the output pressure. 3. Turn the set point dial to 80F and turn the calibration screw to obtain a 3 psig (21 kPa) output pressure. 4.
PAGE 3
Fig. 3: Back View of T-4054 Fig. 2: T-4054 Adjustments T-4054 Deadband and Set Point Adjustment (See Fig. 2) The T-4054 can easily be adjusted to suit the application by changing the settings on the heating and cooling dials. If the thermostat has been tampered with or is out of adjustment, proceed with the following instructions to recalibrate the instrument.
PAGE 4
8. Turn the lower dial to the desired set point. 9. The difference in the dial settings is now the deadband. Remove the test gage. T-4110 Set Point Adjustment (See Fig. 4) 1. Tee the test gage into the output line. 2. Furnish restricted supply air to the instrument. 3. Note the ambient temperature in the space. 4. Move the set point lever to that temperature. 5. Turn the calibration screw until the output pressure is at the mid spring range of the controlled device. 6.
PAGE 5
pressure to the heating apparatus is at the mid spring range of the controlled device. 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. 6. Turn the heating set point dial to the desired set point. Cooling Set Point Adjustment Heating Set Point Adjustment (See Fig. 6) 1. Insert the test gage. 2. Furnish restricted supply air to the instrument. 3.
PAGE 6
Switchover Point Adjustment for T-4506, T-4516, and T-4756 The above thermostats are factory set to switch from one element to the other at 17 psig for a typical 15-20 psig supply system. If a different supply system is to be used, proceed with the following instructions to reset the switchover point to a value between the two supply pressures. The switch point is adjustable from 15 to 20 psig (105 to 140 kPa). 1. Remove the controller from the mounting bracket. 2.
PAGE 7
Notes T-4000 Technical Bulletin 7
PAGE 8
Notes Controls Group 507 E. Michigan Street P.O. Box 423 Milwaukee, WI 53202 8 T-4000 Technical Bulletin Printed in U.S.A.