4
V) POWER UP & TESTING
1.
Close the enclosure door and secure screws on the front panel.
2.
Make sure power supply to the fan Control system is OFF. Turn ON the 24 VAC
power to the P2621-NO2/VC unit.
3.
The green POWER light should turn ON. The word –FAN- should appear in the
LCD display. After several minutes the LCD display will display the current
Nitrogen Dioxide (NO2) reading in parts per million (ppm).
NOTE: After the P2621-NO2/VC has been OFF, when power is restored to the
unit, -FAN- will appear in the LCD display and the unit will run ventilation fan
for several minutes to clear the air of accumulated Nitrogen Dioxide (NO2) and
then return to normal operation.
4.
Turn OFF the power to the P2621-NO2/VC. Turn ON the power to the
ventilation fan Control system. Then turn on the power to the P2621-NO2/VC.
The green POWER light should turn ON. The word –FAN- should appear in the
LCD display. After several minutes, the LCD will display the current Nitrogen
Dioxide (NO2) reading in ppm.
VI) Regular Maintenance
To ensure the sensor is operating correctly and performing proper gas detection, it is
extremely important for the user to verify the sensor is responding correctly to the NO2
gas at a regular interval. Conspec stipulates a gas injection into the sensor and verify the
response of the sensor for every THREE MONTHS of operation.
To perform an actual gas verification, simply inject a known concentration of certified
NO2 test gas (recommended 10 PPM of NO2 gas balance with Air) into the sensor. After
injecting the test gas into the sensor for FOUR minutes, verify the reading displayed on
the 3-digit LCD. If the reading displayed on the LCD is within 2% of the NO2 gas
injected (if 10 PPM of NO2 Gas is used, then the reading should read between 8 to 12
PPM), then the sensor is operating correctly and no further calibration will be required.
The user can also verify that the Controller is performing its Control function correctly by
noticing the ventilation fan is turned ON when the gas reading exceeds 1 PPM. (If the 10
PPM NO2 test gas is maintained into the sensor for more than 15 minutes, an audible
piezo horn will be sounded). At the end of verification, if the user wishes to clear the
alarm NO2ndition faster, zero gas can be injected into the sensor for 2 minutes to purge
the sensor.
At the end of four minutes after the test gas was injected into the sensor, if the reading on
the 3-digit LCD deviates from the actual concentration of the test gas by more than 2%,
then proper calibration of the sensor will be required. The user can purchase a calibration
