21 Changi South Street 1 Singapore 486777 Phone: +65 65420833 Fax: +65 65426920
E-mail: ductless@escoglobal.com Website:
www.escoglobal.com/ductless
SERVICE SECTION
CHAPTER 1 – RE-CERTIFICATION AND MAINTENANCE BY SERVICE PERSONNEL
3. Using thermo-anemometer, check the inflow velocity of the cabinet to make sure that:
a. The inflow velocities vary from the nominal point given in the test report by no more than
0.025 m/s. If the deviation is more than 0.025 m/s, adjust the speed control to get the
nominal inflow setpoint. If either of nominal inflow cannot be achieved by speed control
adjustment, then the cabinet would need re-balancing.
b. The inflow velocities are within 0.02 m/s from the velocity values displayed on the LCD. If
and only if the velocity values displayed on LCD vary by more than 0.02 m/s from the
actual inflow and downflow velocities, the microprocessor would need to be re-
calibrated. Please refer to the Microprocessor Calibration section of the Test Report.
4. Perform the filter retention efficiency (filter saturation test). Please refer to Appendix A.
5. Perform cabinet containment test
6. You are recommended to perform the following optional tests too:
a. Operator comfort tests: light, noise, and vibration
Esco conducts training courses on the validation and certification of fume cabinets. If you are interested
you are most welcome to contact Esco or your nearest Esco distributor.
1.2 CALIBRATION OF THE SENTINEL™ CONTROL
Note: This section applies only for SPD-3AX/SPD-4AX
The purpose of calibrating the controller is to let the controller record particular output voltages from the
airflow sensor and correspond them to fail and nominal points of air velocity. Once the calibration has
been completed, the control will be able to show the air velocity whenever the fan is in operation. All
Esco cabinets are factory-tested and calibrated before being shipped.
Calibration is required in the following eventualities:
• The cause of airflow alarm cannot be determined
• At the time of annual re-certification
Please refer to the calibration section of the test report for the details on steps involved in calibration,
equipments needed for carrying out calibration and other testing procedures. The calibration must be
done in the maintenance mode.
1.2.1 Sentinel control display in maintenance mode
DISPLAY
DESCRIPTION
C203 V1.0 Software version
M.: Maintenance Mode
FAN: ON/OFF Fan status
WARM UP: XX Warm up time
PURGE:XX Purging time
B/H/M:XXXX Blower hour meter
F/C/D: XX-XX-XX Year ( 04-32), Month (0-12), Day (0-31)
LIGHT: ON/OFF Light status
A/F MONITOR:D/E Airflow monitor status (enable or disable)
ADC A/F : XXXX ADC value of current air-velocity sensor
ADC ZERO: XXXX ADC value of airflow zero point
ADC FAIL: XXXX ADC value of airflow fail point
ADC OPTM: XXXX ADC value of airflow nominal point
ADC TEMP: XXXX ADC value of temperature sensor
TEMP : 00 °C/F Current temperature (Celsius or Fahrenheit)
CONSTANT: 050 Temperature compensation formula constant
ADC stands for Analog to
Digital Conversion
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