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Apollo GEM Control Unit Supply
The Apollo GEM controller is connected in series with the electric water element, between the
electric water element breaker or isolator and the electric water element.
If a dedicated circuit exists between the water heater and the consumer unit and also the
incoming supply from the electricity company upstream of all supply connections, including the
PV system, is close to the consumer unit then everything can be direct wired and the standard
Apollo GEM system can be used.
If the water heater is supplied from a non-dedicated circuit, e.g. a ring main, or the water heater
circuit has other appliances attached such as a shower pump, the wireless connection kit will be
required.
The optional wireless connection kit may also be required if it is desired to install the control unit
near the hot water cylinder or other location for display visibility, or the main electricity company
supply connection is remote from the consumer unit.
Important
(1) If the Apollo GEM controller is located remotely from the water heater e.g. next to the
consumer unit a double pole isolator must be incorporated between the Apollo GEM
output (L1 or L2) and the water heater and positioned in the vicinity of the water heater.
If the Apollo GEM controller is located in the vicinity of the water heater a double pole
isolator must be incorporated in the supply to the Apollo GEM and co-located with the
Apollo GEM controller.
(2) There must be no other appliances or circuits or timing devices connected to the electric
water element output of the Apollo GEM when used in variable power output mode.
Prior to installing a Apollo GEM system the existing electric water element may have never been
used, or used rarely. It is strongly advised to inspect and check the existing electric water
installation and ensure that:
• The cable is adequately sized
• The cable is in good condition
• The terminations in the electric water element and isolator are in good condition and
tight
Apollo GEM Installation Manual
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