Technical data

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The ISM1 is a specially designed interface that integrates
a solar heating system with a solar-compatible weather or
load compensation unit such as the FW100 or FR110.
As such, it enables the hot water system to take heat from
the solar panels when the sun is shining and then bring the
boiler back on when there is not enough sunshine available.
In this way, the user gets maximum benefit from solar
heating while ensuring that hot water is always available.
Another major benefit of this arrangement is that the end
user only needs one controller to control both the solar and
boiler systems, making the system much easier to use. The
in-built intelligence of the FR110 and FW100 ensure that
solar-related information is only displayed when the ISM1
is connected, to avoid confusion.
All connections are plug-in for ease of installation and
colour coded for greater clarity.
The ISM1 is compatible with Greenstar CDi Classic System
boilers providing the optional integral diverter valve is used
and has the potential to reduce energy consumption by 15%
compared to conventional systems.
Installation
For installation guidance please consult product
installation instructions.
Electrical connections
Always route cables/leads through the pre-assembled
grommets and apply the strain relief supplied to protect
the system against the ingress of dripping water.
Connection – low voltage section with BUS connection
Permissible cable length between the Heatronic 3 with
BUS capability and the ISM1:
To avoid inductive interference, lay all BUS cables separately
to lines of 230V or 400V (minimum spacing 100mm).
In case of external inductive interference, shield the cables.
This ensures that the cables are shielded from external
interference (e.g. heavy current cables, overhead wires,
transformer stations, radio and television sets, amateur
radio stations, microwave ovens etc).
Solar panel and cylinder sensors
Dedicated sensors for both the solar panel and the hot
water cylinder are supplied with ISM1.
When sensor leads are extended, apply the following lead
cross-sections:
230V AC connection
Mains voltage should only be installed to the terminals
on the left of the ISM1 and under no circumstances be
connected to the BUS or sensor terminals.
ISM1 Intelligent Solar Module
Cable length Cross-section
≤ 80m 0.40mm
2
≤ 100m 0.50mm
2
≤ 150m 0.75mm
2
≤ 200m 1.00mm
2
≤ 300m 1.50mm
2
Cable length Cross-section
≤ 20m 0.75mm
2
– 1.50mm
2
≤ 30m 1.00mm
2
– 1.50mm
2
≥ 30m 1.50mm
2