28 Instruction manual TWI 35-130 G/TWI 45-190 G
Warning
The installation shall be carried out by a recognised installation engineer
in accordance with the generally and locally applicable regulations
(1.3 “Regulations”).
3.10.1 Introduction
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 fi gure shows a view of the electrical connector block.
3
Installation
3.10 Electrical connection
