DORCHESTER DR-LA 110, User Manual

Page: 29 / 64

Electrical connection
Instruction manual DR-LA 29
is
4. Screw the cable clips
3
in place in the draught diverter and the water heater.
3.10 Electrical
connection
Warning
The installation should be carried out by an approved installation engineer
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 and documents .
3.10.1 Introduction
Topics covered in this paragraph:
•
3.10.2 Preparation ;
• 3.10.3 Mains power ;
3.10.2 Preparation
c
Note
The water heater is phase-sensitive. It is absolutely essential to connect
the phase (L) from the mains to the phase of the water heater and the neutral
(N) of the mains to the neutral of the water heater.
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. For more information or to order this isolating
transformer, please contact Hamworthy.
Figure 3.7 shows a front view of the electrical connection block. Table 3.6
shows the associated connections.
Table 3.6 Electrical connection block DR-LA
Mains power Combustion products
discharge safety device
Volt Free contact
Lock Out
Volt Free contact
Normal Run
N L
1
A
L
2
L
3
NO P NC NO P NC
1 2 3 4 5 6 7 8 9 10 11 12
Close Control
Thermostat
Time clock power Corex Anode
power
Time clock
connection
A
N L N L N L N L L L L
13 14 15 16 17 18 19 20 21 22 23 24