A.O. Smith BFC - 28 - Manual (Page 30)

Installation
30 Instruction Manual BFC
3
is
3.10 Electrical
connection Warning
The installation should be carried out by an approved installer in compliance
with the general and local regulations imposed by the gas, water and power
supply companies and the fire service.
Refer also to paragraph
’1.3 Regulations’ .
3.10.1 Introduction
Topics covered in this paragraph:
•
3.10.2 Preparation ;
• 3.10.3 Mains voltage ;
Optionally, it is possible to connect an isolating transformer, a continuous pump,
a program-controlled pump, a
“ Tank ON” and an “Alarm OFF” to the appliance.
For these options, see:
•
3.10.4 Isolating Transformer ;
• 3.10.5 Continuous pump ;
• 3.10.6 program-controlled pump ;
• 3.10.7 Extra ON mode switch (“Tank ON”) ;
• 3.10.8 Connecting extra error signal (“Alarm OUT”) .
n Remark
The optional components are not included in the rating for electrical power
consumption (see tables in paragraph
3.4 ).
3.10.2 Preparation
c Note
The appliance is phase-sensitive. It is absolutely essential to connect the
phase (L) from the mains to the phase of the appliance, and the neutral (N)
of the mains to the neutral of the appliance.
There should also be no potential difference present between neutral (N)
and earth (
A
). If this is the case, then an isolating transformer must be
applied in the supply circuit. See ’3.10.4 Isolating Transformer’ .
Figure 3.6 shows a view of the electrical connection block. Table 3.10 shows the
associated connections.
Table 3.10 Electrical connection block
Unu
sed
Tank on Continuous
pump
Regulated
pump
Alarm Off Isolating transformer Mains power
primary secondary
X
1
X
2
A L N N L A X
1
X
2
A N L A N L A N L A
1-4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24