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Electrical connection
7
Electrical connection
DANGER
Risk of electric shock!
▶ This appliance incorporates two electrical supply cables (230V
AC)
▶ Isolate electrical components from all power supplies (230 V AC)
(fuse, circuit breaker) and secure against unintentional re-
connection before carrying out any work.
Information on safe isolation can be found in the Health and Safety
Executive guidance HSG85.
▶ Check for zero potential before proceeding with work, using test
equipment approved to GS38 to confirm that the electricity supply is
disconnected.
Electrical considerations:
▶ All electrical work must be carried out by a competent and authorised
person.
▶ All work must comply with the current IET Wiring Regulations.
▶ The isolators shall be situated next to the appliance for new systems
and, where practicable, replacement appliances.
▶ Any additional components that are connected to the appliance that
require 230 Volts must be connected within the appliance.
▶ The correct type of RCD must be employed where additional
protection is required that is suitable for a low energy DC modulating
pump according to IET wiring regulations.
7.1
Safety instructions
HDanger to life from electric shock
Means to safely disconnect the unit from supply mains must be
incorporated.
HDo not operate the appliance without the front cover
The front cover of the control box must be attached before operating the
appliance.
HMalfunctions caused by electrical interference!
High-voltage cables (230/400 V) in the vicinity of communication- and
sensor cables can cause the indoor unit to malfunction.
HThe system will be damaged if it is commissioned without water
▶ Only operate the device when it is filled with water and at the correct
operating pressure.
7.2
Cable types
An overview of replaceable or external cables is shown in
tables 13, 14 and 15
7.3
Cable routing
NOTICE
Risk of damage from hot appliance components.
Hot appliance components can damage electrical cables.
▶ Ensure all electrical cables are in the correct cable guides and away
from hot appliance components.
24
Cable routing
▶ Run power cables separately from signal and sensor cables.
Interference from power cables can induce spurious faults on signal
cables, ensure that there is at least 100mm separation from each
other.
▶ Ensure the cables are not stretched or tight.
▶ Avoid sharp edges.
7.3.1
Power cables
▶ The appliance is provided with both power cables. These emerge
from the central area of the bottom of the electrical control box
(fig 26).
▶ Route cables neatly to the rear of the appliance and clip to fixed
surfaces in accordance with IET wiring regulations
▶ If a power cable is to be replaced, refer to sections 7.4 and 7.5
▶ A spare strain relief is supplied in the hardware pack, if required.
FRONT
1
2
3
6
7
BOTTOM VIEW
Fig. 26 Cable feeds to control box
[1]
Area for (low voltage) control and sensor cables
[2]
Accessory PC2 (plate cut out)
[3]
230V control unit supply in
[4]
230V heater supply in
[5]
230V accessory MM100
[6]
230V accessory PW2
[7]
Pump PC0 230V
[8]
Pump PC1 230V
[9]
Heater out 230V
7.3.2
Control and sensor cables
▶ The (low voltage accessory) control and sensor cables should be
routed neatly to the rear of the appliance.
▶ Cables enter the left area of the bottom of the electrical control box
via the bungs (fig 26)
▶ If a cable is to be installed or replaced, refer to sections 7.4 and 7.6
Pre plumbed cylinder – 6 721 852 928 (2023/04)
4
5
8
9
0010047651-001
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