User Guide

D Room Thermostat Direct Acting Technical Instructions
Document Number 155-072P25
Rev. 1, April, 2000
Siemens Building Technologies, Inc.
Page 3
Calibration
1. Check room temperature. It should be approximately 70° to 75°F (21° to 24°C).
2. Remove thermostat cover using adjustment key (Part No. 356-055). See
Figure 2.
Figure 2. Removing the Thermostat Cover.
3. Loosen test screw (see
Figure 3
) 1/2 turn counterclockwise then attach test gauge
and hose assembly over the test screw body.
Figure 3.
4. Stand away from thermostat for about five minutes. If control pressure does not
read 7 to 8 psi (48 to 55 kPa), turn adjustment screw with key (Part Number
856-055) until this pressure is obtained.
5. If the dial reading and room temperature do not agree, loosen dial retaining screw.
(See
Figure 3.
)
6. Tilt and rotate until dial reading agrees with room temperature. Do not turn dial
pinion. Retighten dial retaining screw.
The instrument is now in calibration and can be set to desired room temperature.