Siemens Powers TH 192 S Technical Instructions page 9

TH 192 S Single Temperature Room Thermostat
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Siemens Building Technologies, Inc.
Landis Division
S S S S t t t t e e e e p p p p 3 3 3 3 —
Moisten needle and insert 192-633 test
gauge and needle adapter in a test port.
Read control pressure.
Before troubleshooting thermostat per Table 4, make certain there is clean dry supply air
at 18 psi (124 kPa) minimum. Use test probe gauge and needle adapter to measure
control pressure at thermostat test port.
The output pressure test port is accessible without removing the thermostat cover
through the 8th opening from the top. For one-pipe thermostats, the port is on the right
side. For two-pipe thermostats, the port is on the left side.
F F F F i i i i g g g g u u u u r r r r e e e e 9 9 9 9 . . . . A A A A c c c c c c c c e e e e ss
S S S S t t t t e e e e p p p p 4 4 4 4 —
If control pressure does not read 7 to 8 psi
(48 to 55 kPa), turn calibration screw using
192-632 calibration tool or 1/8" (3.2 mm)
wrench until 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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Technical Instruction
155-065P25
Rev. 1, July, 1999
Page 9