Installation; Wiring Diagram - Marlec Solar iBoost+ Installation Instructions

3

Installation

Positioning - Use the installation template provided
Locate the Solar iBoost+ close to the hot water tank and connect electrically between a fused outlet or MCB
and the immersion heater(s). Keep cable distances to a minimum whilst ensuring they are secured to prevent
connection movement in service.
Install the unit with a
minimum 100mm
clearance on each side.
Do not allow airflow to be obstructed. Ensure
nothing is fitted within the red zone shown
around the unit.
The unit must be fitted vertical on the wall.
Fixing the Solar iBoost+
Using the screws and wall plugs provided or suitable screws for the mounting surface, fix the Solar iBoost+
using the 4 fixing points...
Rear Hanging Brackets
4
Connecting the Solar iBoost+
SUPPLY HTR 1 HTR 2
_
+ _
+
L N
SUPPLY
L 220-240V ac Input - must be protected by 16A MCB or
13A fused outlet.
N
Neutral
Earth (all earth terminals common)
HTR 1 / HTR 2 (IMMERSION HEATER CONNECTIONS)
+
Connect to the Live terminal of the immersion heater
thermostat, max 13A.
-- Connect to the Neutral terminal of the immersion heater
Earth
100mm
100mm 100mm
100mm
Fixing Screw Points

Wire the Solar iBoost+ in accordance with
the Wiring Diagram.

HTR2 Terminals allow the connection of a
second immersion, if fitted.

Terminals allow the connection of up to
4mm² solid copper conductor or multi-
strand cable.

Solar iBoost+ has overvoltage protection
and will temporarily stop diverting if the
supply voltage is above 260V ac.

Ensure terminals are fully tightened and
cable is clamped using the cable clamps
provided. Where necessary, invert the
plastic cable clamp to provide the correct
grip.

After wiring replace the terminal cover.
Only use the screws provided with the
cover. DO NOT switch on at this stage.

Ensure the cover is tightened down as
this prevents vibration of the fan unit
and unwanted fan noise.

Wiring Diagram

For all installations -

Test the immersion heaters and thermostats before installation and replace defective parts where
necessary. Do not install the Solar iBoost+ where a functioning thermostat is not present. A good
3kW immersion will give a resistance reading of 20 ohms. Replace any aged or damaged cables.

There must be no control of the immersion heater(s) by any equipment other than the Solar
iBoost+. In addition, there should not be any additional source of power connected to the
immersion heater. The Solar iBoost+ will replace any Boost controls or Hot Water Timers.
Failure to comply will result in damage to the Solar iBoost+ and invalidate your warranty.
Single or Dual Immersion Heater connection
Where a single immersion heater
is fitted (most common installation)
it should be connected to the
terminals marked HTR 1.
SUPPLY HTR 1
_
+
L N
220-240V AC
From 16A
MCB or 13A
fused outlet
The output from the Solar iBoost+ is
modulated DC and cannot be measured with
an AC Voltmeter.
+ –
Note: The outputs are and (not Live and
Neutral) and are not referenced to L, N or E.
If measured, a voltage may be present
between either output and earth.
Dual Immersion Heater Operation
The Solar iBoost+ 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 described so
that the Solar iBoost+ 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 iBoost+ 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 iBoost+ 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.
This operating mode is the same whether diverting excess generation or in boost function.
Where two immersion heaters are present, connect
the upper most heater in the tank to the HTR1
terminals and the lower heater to the HTR2
terminals. Correct connection is important so that the
upper most heating element receives heating priority.
HTR 2
+ _
TOP Heater
N
Immersion Heater and
max. 3kW
L
LOWER Heater (if fitted)
N
max. 3kW
L
Thermostat
Immersion Heater and
Thermostat