8 - WATER CONNECTIONS
If the system is isolated by a valve, it is imperative to install a
bypass as indicated below.
Winter position
Unit
Water network
Closed
Closed
Open
IMPORTANT REMINDERS:
Depending on the atmospheric conditions in your region, you
need to:
- Add an appropriate antifreeze solution agreed by the
manufacturer (maximum of 45%) to protect the system
down to a temperature of 10 K below the lowest
temperature likely to occur locally.
- For extended shut-downs, drain and add an anti-freeze
solution to the heat exchanger (use the drain valve
located at the water inlet).
- To prevent corrosion due to dierential aeration, if the
system is to be empty for more than 1 month, the heat
transfer uid circuit should be protected with a blanket
of neutral gas (0.5 bar maximum). If the heat transfer
uid does not meet the manufacturer's recommendations,
a nitrogen blanket must be applied immediately.
- In case of prolonged non-usage, the hydraulic circuits
must be protected by circulating a passivating solution
(consult a specialist).
- At the start of the next season, rell the unit with water
and add an inhibitor.
- If auxiliary equipment is installed in the system, the
installer must ensure that the resultant ow rates are
still within the minimum and maximum values indicated
in the operating limits table (application data).
- If frost protection is dependent on electric heaters, never
de-energize the unit when frost protection is required.
To ensure protection, the main unit disconnect switch
and the auxiliary heater protection circuit breaker must
be closed (see wiring diagram to locate these
components). If it is not to be used in freezing conditions,
or during a prolonged power failure (planned or
unplanned), the water type heat exchanger and external
pipes must be drained without delay. Damage caused by
frost is not covered by the warranty.
- The heat exchanger temperature sensors are an essential
frost protection element: if piping trace heaters are used,
ensure the external heaters do not affect the
measurements provided by these sensors.
- If there is a Water Type Heat Exchanger Connection
sleeves option, it is necessary to install a heater on each
extension in order to protect the water pipes down to an
outdoor temperature of 0 °C. The anti-freeze and heater
solutions can be combined.
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