Differential Pressure Monitor Owner’s Manual
C. The pressure in the room is positive (negative) with respect to the
adjacent space (corridor or anteroom), but DIFF PRES1 (Point 30)
indicates a negative (positive) value.
1. Check that the sensor is not exposed to any drafts that may bias the sensor reading.
Contact your local Siemens Building Technologies representative if sensor
relocation is necessary.
2. Toggle SIG1 PHASE (Point 67) from LO to HI (or from HI to LO) depending on its
current setting.
3. Contact your local Siemens Building Technologies representative.
D. The pressure in the anteroom is positive (negative) with respect to
the adjacent space (corridor), but DIFF PRES2 (Point 31) indicates a
negative (positive) value.
1. Check that the sensor is not exposed to any drafts that may bias the sensor reading.
Contact your local Siemens Building Technologies representative if sensor
relocation is necessary.
2. Toggle SIG2 PHASE (Point 87) from LO to HI (or from HI to LO) depending on its
current setting.
3. Contact your local Siemens Building Technologies representative.
E. Whenever the room is changed (switched over) to monitor a new
pressurization (isolation) mode, the monitor goes into either high
pressure or low pressure alarm.
1. Check the pressure alarm limits for the monitor. Correct as necessary.
2. Check that the room has had enough time to stabilize in pressure. SWITCH DELAY
(Point 23) should have a value that allows for the room controls to change the room
over to the new pressure mode.
3. Verify that the room controls have changed over to the new mode.
F. The value for DOOR POSN (Point 32) does not match the actual
position of the door.
1. Toggle the value of DOOR SW MODE (Point 34) to NOPEN or NCLOSE.
2. Contact your local Siemens Building Technologies representative.
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Siemens Building Technologies, Inc.
