Before Turning On The Power; Wire Connection Tightness Checks - Lennox eNeRGy Series Installation, Operating And Maintenance

COMMISSIONING
WARNING: commissioning must only be carried out by trained refrigeration engineers whom qualification
certificates are compliant with the local regulation

Before turning on the power

WARNING: ensure that the power supply includes 3 phases with no neutral
Ensure that the power supply between the building and the unit meets local authority standards and that the cable specification satisfies the
start-up and operating conditions displayed on the rating plate.

Wire connection tightness checks

WARNING: check the wire connection tightness before powering up the unit. Some connections may have
loosen during transport
Check the following wire connections for tightness:
• Main switch connections
• Mains wires linked to the contactors and circuit breakers
• Cables in the 24V control supply circuit
• All others connections of the unit
OIL CHARGE
All units are delivered with a complete oil charge, and there is no need to add any oil before starting up or afterwards.
Overcharging with oil can cause serious problems on an installation, particularly for the compressors.
Refrigerant
R410A
Powering the unit
Power up the unit by closing the isolator switch.
The fans and compressors direction of rotation is checked during the end of line test. They should therefore all turn in either
the right or wrong direction.
WARNING: a compressor rotating in the wrong direction will fail shortly.
If one of the components rotates in the wrong direction, disconnect the power supply at the machine's isolator switch and
reverse two of the component's phases on the terminal within the electrical panel.
While starting the unit, fill in the check list sheet of this manual to be sure that the unit correctly installed and ready to operate.
• Check the current values per phase on each fan motor.
• Check the current values per phase on each compressor motor.
• Check suction and discharge pressures and compressor suction temperature.
• Check chilled liquid entering and leaving temperatures if water cooled unit.
• Check outdoor air temperature and indoor temperature.
• Check if DAD is ON.
These verifications should be made as quickly as possible with a stable cooling load, i.e. the cooling load of the installation
should be the same as the capacity developed by the unit. Measurements taken without heeding this condition will result in
unusable and probably wrong values.
These verifications can only be made once the proper operation of all safety devices and unit controls has been established.
Check if the customer's air ducts are open to be sure the unit is not running with ducts closed. In addition it is needed to check
if the airflow and available static pressure are in accordance with the unit.
eNeRGy-IOM-2020.11-EN
Compressor type
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Oil Type
The oil type depends on compressor model that depends on the
unit size. Use only oil approved and recommended by Lennox
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