129-075
Installation Instructions
Rev. 2, November, 1999
Siemens Building Technologies, Inc.
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1. Use a test thermometer to read the current room
temperature.
2. Place a screwdriver in the center of the thermometer
assembly (Figure 4). Carefully rotate the thermometer
assembly until the pointer tip indicates the correct
room temperature.
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: Avoidbreathingonortouchingthebimetal
spiral since this affects the temperature
reading.
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Thermostat limit stops define the minimum and maximum
thermostat set points. The limit stops engage in the set
point cam gear teeth and cause interference between the
set point cam gear and the adjustment knob gear.
To change the limit stop settings, use a needle nose pliers
to pull the limit stop (Figure 4) between the set point cam
gear teeth. Do not pull the limit stop any more than
necessary to clear the gear teeth. Rotate the limit stop to
its new position. Changing the limit stop position one gear
tooth changes the limit stop setting by 1-1/3°F(0.7°C).
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The factory thermostat sensitivity setting is approximately
2.5 psi/°F (31 kPa/°C). To change the sensitivity, use a flat
blade screwdriver to carefully move the sensitivity slide
(Figure 4) to the desired position as follows:
Graduation closest
to the rigid end of
the bimetal element
4psi/
°F (50 kPa/°C)
Graduation closest to
the minimum (MIN) end
of the bimetal element
1psi/
°F (12 kPa/°C)
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: If the thermostat sensitivity is adjusted,
recalibrate the thermostat.
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The thermostat is factory calibrated to a control pressure of
7.5 psi (52 kPa) when the set point and the ambient
temperature are both at 72°F (22°C). No adjustments are
required if these settings are appropriate.
If the thermostat has been tampered, the sensitivity
changed, or it is out of adjustment, use the following steps
to recalibrate the instrument.
The output pressure test port (Figure 5) is accessible
without removing the thermostat cover through the 8th
opening:
•Forone-pipethermostats,thetestportisontheright
side.
•For two-pipe thermostats, the test port is on the left
side.
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If you use the wrong test port, thermostat
damage can occur and result in
replacement of the device.
1. Make certain that the air supply is 25-30 psi
(172-207 kPa).
2. Remove the cover using the calibration tool. Verify that
the room temperature is between 70 and 80°F(21and
27°C).
3. Verify that the supply pressure is 18 psi (124 kPa). Set
the dial to the room temperature by turning the
exposed adjustment knob or using a hex key. Allow
the thermostat to stand for about five minutes to
adjust to the new setting.
4. Moisten the needle and insert the test gauge and
needle adapter in the output pressure test port
(Figure 5). Read the control pressure.
5. If the control pressure does not read 7 to 8 psi (48 to
55 kPa), turn the calibration screw (Figure 4)usingthe
calibration tool or a 1/8-inch (3.2 mm) wrench until the
pressure is 7 to 8 psi (48 to 55 kPa). The sensing
element is now in calibration and the set point can be
changed to the desired room temperature.
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