Troubleshooting guide

Technical Bulletin Calibration Kit for Room and Duct Thermostats
Document Number 155-253P25
December 9, 2003
Page 2 Siemens Industry, Inc.
Description,
Continued
Dual Scale Pressure
Gauge
The dual scale pressure gauge has a dual
scale of 0 to 30 psi and 0 to 200 kPa, and
is bottom-connected. It is used to measure
the air pressure being delivered to a
pneumatic device or the branch line
pressure of a thermostat.
Figure 3. Dual Scale Pressure Gauge.
Hex Allen Wrench
The 1/16 inch hex Allen wrench is used to
loosen the cover screws on room
thermostats.
Figure 4. Hex Allen Wrench.
1/4-Inch (6.4 mm) OD
Plastic Tubing.
The 1/4-inch (6.4 mm) OD plastic tubing is
used to make connections between rubber
tubing and barbed fittings.
Figure 5. 1/4-Inch (6.4 mm) OD Plastic
Tubing.
Tubing Plug
The tubing plug is used to plug pressurized
1/4-inch (6.4 mm) OD plastic tubing air
lines that have been disconnected during
calibration.
Figure 6. Tubing Plug.
Brass Tee
The brass tee holds the pressure gauge
and connects the baumanometer
(Figure 2) to the controlled pneumatic
device, or connects the gauge to the
thermostat’s test port.
Figure 7. Brass Tee.
3/16-inch (4.8 mm) ID
Rubber Tubing
The 3/16-inch (4.8 mm) ID rubber tubing is
used to connect the baumanometer
(Figure 2) or thermostat test port to the tee
holding the gauge.
Figure 8. 3/16-Inch (4.8 mm) ID
Rubber Tubing.
Assembly
Figure 9. Pressure Gauge Assembly.
CAUTION:
Thermostats must be recalibrated whenever sensitivity is changed.