Electrical Connections; Generalities - Lennox Adnova THS Series Installation, Operating And Maintenance Manual

5

Electrical Connections

5.1

Generalities

Before carrying out any job on electrical parts, make sure the power supply is disconnected.
Check that the mains electricity supply is compatible with the specifications (voltage, number of phases, frequency)
shown on the unit rating plate.
The power connection for single-phase loads is to be made with a three-pole cable and "N" wire at the centre of the star
(optional: power supply w/o neutral).
The size of the cable and line protections must conform to the specifications provided in the wiring
diagram.
The supply voltage may not undergo fluctuations exceeding ±5% and the unbalance between phases must always be
below 2%.
The above operating conditions must always be complied with: failure to ensure said
conditions will result in the immediate invalidation of the warranty.
The electrical connections must be made in accordance with the information shown in the wiring diagram provided with
the unit and with current and local regulations. An earth connection is mandatory. The installer must connect the
earthing wire using the earthing terminal situated on the electric control board (yellow and green wire).
The power supply to the control circuit is taken from the power line through an insulating transformer situated on the
electric control board.
The control circuit is protected by suitable fuses or automatic breakers depending on the unit size.
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