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
b. Plug the voltmeter probes to the Motor Voltage Sampling Port, as indicated by the white
circle in the pictures below.
c. If the motor voltage differs from the Nominal Motor Voltage mentioned in the Test Conditions
Documentation Sheet of the Test Report, the speed control would need to be adjusted so
that the motor voltage matches the Nominal Motor Voltage in the Test Report. Your building
supply voltage may differ from the supply voltage at the Esco Test Lab. This supply voltage
difference will roughly double the blower voltage difference, creating a more significant
airflow discrepancy. To measure the building supply voltage:
For example:
Esco factory Your laboratory
Building supply voltage 230 V 220 V
Motor (blower) voltage 135 V 118 V
In this case, the motor voltage must be increased from 118 volt to 135 volt by turning the
speed control clockwise in order to match the given motor voltage at the Esco factory. Please
note that the difference between the motor voltages is always greater than the difference
between the building supply voltages. Therefore, in this case, it is not enough to increase the
motor voltage just by 10 volts (which is the difference between the building supply voltages).
Rather it needs to be increased by 17 volts.
Building supply voltage of 230 V cabinet
Plug one voltmeter probe to the LIVE terminal
block (red wires), and the other probe to the
NEUTRAL terminal block (blue wires)
SPEED
CONTROLLER
KNOB
For both 115V / 230V models
Plug the voltmeter to the blue and red (old model
is blue and black) wires joined by a white open-
end connector.
Adjust the speed control by turning the knob of
the speed controller
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