REMKO CMF-80 v.2 - Manual (Page 9)

Defrost by circulation reversal
At temperatures under approx. 5°C
atmospheric moisture freezes on
the evaporator which can lead to
the formation of an ice layer. This
can cause the heat transfer from
the air to the refrigerant and the air
flow to be reduced.
In this case, the ice must be removed.
A four-way valve serves to reverse
the refrigerant circuit, so that the
hot gas from the compressor flows
through the original evaporator and
the ice that has formed there can
melt.
The defrost process is not initiated
after a predetermined time, rather it
is carried out as required in order to
save energy.
Cooling mode with models
CMF 90, CMF 150, CMT 100
and CMT 150
Due to the circulation reversal sys-
tem, a number of REMKO inverter
heat pump models also offer cool-
ing operation.
Cooling mode utilises the refriger-
ant components in order to produce
cold water, in order that heat can
be removed from the building.
This can either take the form of
dynamic cooling or passive cooling.
Under dynamic cooling the re-
frigerating capacity is actively
transferred to the indoor air. This
is undertaken by means of water-
based fan convectors. In doing so,
it is desirable that the inlet temper-
atures are under the dewpoint, in
order to transfer a higher refrigerat-
ing capacity and to dehumidify the
indoor air.
Passive cooling refers to the ab-
sorption of heat via cooled floors,
walls or ceiling surfaces. In doing
so, water-carrying pipes make the
structural sections into thermi-
cally effective heat exchangers. In
order to achieve this, the refriger-
ant temperature has to lie above
the dewpoint, in order to avoid the
formation of condensation. Dew-
point monitoring is required for this
purpose.
We recommend dynamic cooling
with fan convectors, in order to
achieve increased thermal perform-
ance and in order to dehumidify the
air on muggy summer days. The
advantage here is that dewpoint
monitoring is not required.
Versions
We offer two different indoor unit
designs.
The wall-mounted CMF Series is
equipped with a circulation pump
and a safety module on the up-
stream face. In addition, an electri-
cal heating coil can be integrated.
The CMT Series of indoor modules
is additionally equipped with a stor-
age tank and an expansion vessel.
The storage tank has a capacity of
150 litres.
We recommend an external storage
tank for the CMF Series in order to
avoid short operating times for the
heat pump and in order to ensure
that sufficient energy is available to
bridge off-periods.
The comfort zone shows which values for temperature and humidity
are considered comfortable for people. This range should ideally be met
when heating or air-conditioning buildings.
Relative air humidity in %
Uneasily humid
Uneasily dry
Still comfy
Comfy
Room air temperature in °C
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