Installation manual

INSTALLATIONSECTION 3

Solar Station electrical layout for Standard Installations:

*primary temperature sensor will generally only be used in combined (twin-coil) cylinders. In a

pre-heat system with the MAXXflo or other direct-fired water heater. The temperature control

is carried out within the heater and therefore primary heater control is not required.

It is recommended that the power to the controller is easily isolated locally either by

plug switch or switch local to the ‘Solar Station’. This is due to the fact that certain

maintenance settings can only be assessed by switching the unit on and off.

A – Standard Layout. The primary output 230V is connected to a relay so that a volt free signal

can be picked up by a primary control system.

Example: Where the primary heating coil is connected to the heating system boiler, the

controller requires a hot water demand signal. This would then switch the system to water

heating mode or divert flow to the primary coil.

Where the primary system consists of a pump or valve the 230V can be wired directly to the

control unit without the relay. If this is not supplied by Andrews Water Heaters, it should be

checked to ensure it is suitable for the operation.

B – This is where the primary top up is heated by an electric immersion heater controlled by

the solar controller. The 230V has to be used to switch a contactor to allow power to the

immersion heater. Andrews Water Heaters will supply a pre-fitted wired contactor/overload

panel rated for the immersion heater.

Two power wiring connections are required, one for the controller and one for the electric

immersion heater power supply. Please see technical sheet for power supply requirements.

The output can be used for any equipment where large power supplies are required.

C – This uses the same principle as B, except the controller powers the solar pump where

large pumping capacities are required.

NOTE: when a contactor is required for powering the pump, the variable speed option is not

possible.

The above principles can be applied to all the systems.

Fig.6