Electrical Connections; Connecting The Appliance - Benchmark ZB 7-28 R 28 HE Installation And Servicing Instructions

Wall mounted condensing boiler for central heating
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4

Electrical connections

B Always disconnect the power supply to
the appliance at the mains before carry-
ing out any work on the electrical sys-
tems and components.
All control and safety systems are built into the appli-
ance.
B Allow mains cable to protrude at least 50 cm from
wall.
B To maintain the splash-proof (IP) design: cut the
cable grommet hole size to match the diameter of the
cable, see fig. 29.
B The appliance must be earthed.
B It must be possible to completely isolate the appli-
ance with at least 3mm contact separation in both
poles.
The wiring between the appliance and the electrical
supply shall comply with current IEE Wiring Regulations
(and any local regulations which apply) for fixed wiring
to a stationary appliance.
• Supply: 230 V ~ 50 Hz, 150 Watts
• External fuse 3 A
• The system connected to the boiler must NOT have
a separate electrical supply
• Water Protection IPX4D (with fascia blanking plate
fitted or IP20 without blanking plate).
4.1

Connecting the appliance

To gain access to the mains connection remove the
drop down facia cover. The drop down cover is
removed by lowering it to the horizontal position and
pushing firmly upwards at the rear of the supports to
release the cover. Lift cover from the appliance.
After installation (or in the event of an electrical fault) the
electrical system shall be checked for short circuits,
fuse failure, incorrect polarity of connections, earth con-
tinuity and resistance to earth.
6 720 611 443 GB (05.04)
B Pull out cover panel at the bottom and remove. Refer
to fig. 27.
3
0
4
2
5
1
E
6 720 610 332-10.1R
Fig. 27
B Remove screw and slide terminal cover forwards to
remove. Refer to fig. 28.
3
0
4
2
5
1
Fig. 28
B Cut cable grommet to diameter of cable.
3
0
4
2
5
1
8-9
5-7
10-12
13-14
Fig. 29
B Feed cable through cable grommet and connect the
mains supply cable, see fig. 30.
Electrical connections
E
6 720 610 332 -11.1R
E
6 720 610 332-12.1R
21

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