Dimplex LA 12 MI - System Filling, Flushing, and Components

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It is important to install the flow checker on the flow
pipe so it is protected from impurities within in the
system via the filter on the heat pump return.
Figure 12: Minimum straight pipe distance before entrace
to Taconova unit
Figure 13: Ensure the flow rate through the Taconova is
in the same direction as the arrow
Plumbing connections
Model
Fitting size
Torque
LA 6 MI
1 ¼” male flat face
118 Nm
LA 9 MI
LA 12 MI
LA 16 MI
Table 12: Water connections on LA MI
Frost protection
So long as the heat pump is connected to the mains
electrical supply the automatic antifreeze function will
prevent the water in the pipes freezing during cold
weather.
In case of a prolonged power supply failure or a
circulation pump failure the system must be drained
using the screws on the flow and return connections.
When water is idle inside the system, freezing up is
very likely to happen which could damage the system
beyond economic repair.
The installer should conduct a risk assessment to
determine the likelihood of water freezing in the heat
pump and interconnecting pipe work in the event of a
power failure during cold weather. The heating circuit
should be dosed with suitable antifreeze if heat pump
system is in a building where a power failure cannot be
detected or the occupants would be unable to drain
the system. If antifreeze is used the concentration
should be large enough to prevent freezing for the
coldest local temperature and the installer should
ensure the glycol is vented to a suitable place to
prevent contamination of the environment or sewage
system in the event the pressure relief valve activating.
Condensate
During normal operation the heat pump will remove
water vapour from the air. The condensate will run
down the evaporator into the condensate tray where it
will drain out of the unit. Defrosting takes place up to
16 times per day, with up to 3 litres of condensed
water being produced each time.
Condensed water that forms during operation must be
drained off frost-free. The heat pump must be mounted
on a level surface to guarantee proper drainage. The
condensate such drain onto a surface such as gravel.
If a tray is used to funnel the condensate, the drainage
pipe must have a minimum diameter of 50mm and
should be fed into a frost free trap and then a sewer for
rain water to ensure that large quantities of water can
be drained off.
Flushing the system
It is advisable to fit specific connections for flushing
and filling as shown in the plumbing schematics.
Before connecting the heating water system to the
heat pump, the heating system must be flushed to
remove any impurities and residue from sealants, etc.
Any accumulation of deposits in the condenser could
reduce the heat pumps performance. Do not use worn
out piping that may have become blocked over time.
Ensure that impurities are not flushed though
the heat pump since they could block the
channels in the condenser.
The condensate must drain on to an surface
that is freely draining. It must not drain on to
footpaths or patios as it could refreeze and
become a hazard.