Part Two
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CHECK - Sensor input
Enter
SENSOR INPUT
menu item in diagnostics menu. A voltage between 0 and 10 volts
DC will be displayed. It is not important what the exact voltage is to pass this test. Tape
over the pressure sensor (slide pressure sensor door open) and voltage should read
approximately 5 volts (zero pressure). Remove tape and blow on sensor. Displayed value
should change. If voltage changes, the sensor is functioning correctly. If voltage does not
change, proceed to CHECK - Sensor status.
CHECK - Sensor status
Enter
SENSOR STAT
menu item in diagnostics menu. If
NORMAL
is displayed, the
unit passes test. If an error message is displayed, go to diagnostics menu section of the
manual,
SENSOR
STAT
menu item for explanation of error message.
CHECK – Temperature sensor input
Enter
TEMP INPUT
menu item in diagnostics menu. A temperature value will be
displayed. The exact temperature displayed is not important as long as the temperature
changes when space temperature changes.
CHECK - Flow station
The Flow Check menu lists all the flow stations that can be installed. Check each flow
station menu item that has a flow station attached. Enter
___ FLOW IN
menu item and
the actual flow will be displayed. If the flow is correct, no changes need to be made. If
flow is incorrect, recalibrate until actual flow matches flow station reading.
If unit passed all checks, the mechanical components are physically working.
Calibration
The calibration section explains how to calibrate and set the elevation for the AOC pressure
sensor and how to calibrate a flow station.
NOTE
: The pressure sensor is factory calibrated and normally does not need to be adjusted.
However, inaccurate readings may be detected if pressure sensor is not installed
correctly, or problems with the sensor exists. Before calibrating, check that the sensor is
installed correctly (usually only a problem on initial set up). In addition, go into
DIAGNOSTICS
menu,
SENSOR STAT
item. If
NORMAL
is displayed, calibration
can be adjusted. If an error code is displayed, eliminate error code and then verify
pressure sensor needs adjustment.
Adjusting the S
URE
F
LOW
pressure sensor calibration may be required to eliminate errors due to
convection currents, HVAC configuration, or equipment used to make the measurement. TSI
recommends always taking the comparison measurement in the exact same location (i.e., under
the door, middle of door, edge of door, etc.). A thermal air velocity meter is needed to make the
comparison measurement. Normally the velocity is checked at the crack under the doorway, or the
door is opened 1” to allow alignment of the air velocity probe making the measurement. If the
crack under the door is not large enough, use the 1” open door technique.
All pressure transducer based flow stations and 1–5 VDC linear flow stations must be zeroed
upon initial system set up. Linear 0–10 VDC flow stations do not require a zero flow to be
established.
