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Section 4: Electrical
4 ELECTRICAL
! WARNING !
Electric shock may cause serious personal injury or death.
All electrical work must be undertaken by a competent person and
in accordance with the current edition of BS7671 (the I.E.T. Wiring
Regulations), including any amendments. Failure to observe this
legislation could result in an unsafe installation and will invalidate
all guarantees.
The equipment supplied must be wired according to these
Installation Instructions to ensure that the heat pump and
supplementary immersion heater function safely. All electrical
connections made on-site are solely the responsibility of the
installer.
4.1 GENERAL
The electric immersion heater is located at the top of the
volumiser/header and is accessed by undoing the four screws and
removing the sloping cover. Refer to Figure 4-1.
Figure 4-1:
Location of immersion heater
If the immersion heater fitted to the Grant Combined volumiser/
low loss header is to be used, it requires a 230V 50Hz single
phase electrical supply. Refer to Section 4.2 – Electrical
Connections.
In order for the immersion heater to be controlled by the Aerona³
as a supplementary heat source, the volumiser/header will also
need to be connected to the heat pump terminal PCB. Refer to
Section 4.2 – Electrical Connections.
4.2
ELECTRICAL CONNECTIONS
! WARNING !
Ensure that all electrical supplies to the heat pump and
volumiser/header are isolated before making any electrical
connections.
The immersion heater is supplied factory-fitted in the volumiser/
header. However, check that it is securely fitted before proceeding
with the electrical connections.
IMMERSION HEATER POWER SUPPLY
The immersion heater uses a dedicated power supply from a
correctly sized circuit breaker in the consumer unit. The final
supply connection must be made from a 2-pole switch located
adjacent to the volumiser/header.
To connect this power supply to the electrical terminals in the
volumiser/header, refer to Figure 4-2 and proceed as follows:
1.
Remove the access cover from the top of the volumiser/
header. To do this unscrew and remove the four screws and
remove the cover.
2. Feed the immersion heater supply cable through the upper
(larger) of the two cable glands on the left-hand side of the
volumiser/header and connect it to the LOWER immersion
heater electrical terminals as follows:
•
Live to Terminal L (Brown terminal block)
•
Neutral to Terminal N (Blue terminal block)
•
Earth to Earth Terminal (Green terminal block)
Refer to Figure 4-3 for volumiser/header connection
diagram.
3. Tighten the cable gland to securely grip the cable.
Figure 4-2:
Electrical connections
