9
SUPPLY
HTR 1
HTR 2
+
_
+
_
L
N
220-240V
From 16A
MCB or 13A
fused outlet
TOP Heater
LOWER Heater
N
Immersion Heater and
Thermostat
L
max. 3kW
N
Immersion Heater and
Thermostat
L
max. 3kW
Where two immersion heaters are present, wire the heaters into the Solar
as shown below. It is important the upper most heating element in the
tank is connected to the HTR1 terminals so that this element receives heating
priority.
Dual Immersion Heater
Dual Immersion Heater Operation
The Solar automatically detects when two immersion heaters are connected.
As hot water is drawn from the upper part of the tank, it is important the heaters are
connected as shown so that the Solar can automatically give heating priority to
the top heater. Excess generation is diverted to the top heater until temperature is
reached and the heater thermostat opens. Solar then automatically switches to
the lower heater to continue to divert excess generation until the lower heater is also
satisfied and ‘Water Tank HOT’ is displayed.
When diverting to the lower heater the Solar will periodically (every 15 minutes)
switch to the top heater and the cycle of heating begins again. This maintains the
temperature in the upper part of the tank.
An indication of the current heater being supplied is shown on the ‘Heating by Solar’
display, see page 13.
This operating mode is the same whether diverting excess generation or in boost function.
