A.O. Smith TWI 45-190 Electrical connection, 1.3 “Regulations”, Introduction, Preparation, Remark

3 Installation

3.10 Electrical connection	Warning
	The installation shall be carried out by a recognised installation engineer
	in accordance with the generally and locally applicable regulations
	(1.3 “Regulations”).

3.10.1Introduction

This section will cover in the given order:

•Preparation;

•Connect the mains voltage;

•Isolating transformer.

Remark

The optional components have not been included in the electrical power consumption indicated in the table (3.4.2 “General and electrical data”).

3.10.2 Preparation

Caution

The device is phase-sensitive. It is absolutely necessary to connect the phase (L) of the mains to the phase of the device and to connect the zero (Z) of the mains to the zero of the device.

Caution

No voltage difference is allowed between the zero (Z) and the earth ().

If this is the case, apply an isolating transformer (3.10.4 “Isolating transformer”).

Please contact A.O. Smith for additional information or for ordering this isolating transformer. The figure shows a view of the electrical connector block.

28 Instruction manual TWI 35-130 G/TWI 45-190 G