Lennox INNOV DM R Series Application Manual page 48

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 (attached to the documentation of the unit).
The supply voltage may not undergo fluctuations exceeding ±10% 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.
INNOV@ ECFAN DHR -AGU-0912-E • 16 •