7
Cooling of the
heat pump
Cooling via the heating cycle floor
(surface heating cycle )
If the WSP heat pump series is to be cooled via
the cooling mode available as an accessory, this is
possible via the mixed heating cycle. The hydraulic
connection is identical to the connection for the
heating cycle. If the cycle is used for heating and
cooling, it is connected as shown in Fig. 15. The
probes S12 and S11 measure the inlet and return
temperatures.
Cooling via a separate cooling circuit
If a separate cooling circuit should be used with
the system in addition to the heating cycles, then a
changeover valve (A14), which is activated with
230 V, must be installed in the inlet pipe. This is
attached to the controller on A14. In cooling mode,
the valve is switched to the cooling circuit AB/A. If
no cooling mode is operated, the valve is de-ener-
gised at AB/B heating cycle.
Dewpoint control via the Smart Control cable
remote control
If the series WSP heat pump is to be used to
implement surface cooling, the Smart Control cable
remote control must be installed in the selected
reference room (e.g. living room). It is recom-
mended to mount it on an accessible wall in the
living area. In doing so it must be ensured that the
room air can freely flow over the remote control.
The remote control measures the room tempera-
ture and room humidity. From these it calculates
the nominal dewpoint and correspondingly adjusts
the cooling water temperature with a sufficient
safety margin so that the temperature on the acti-
vated room surface as well as the exposed pipes
does not fall below the dewpoint.
The water temperature in the pipes is main-
tained above the nominal dewpoint temperature
by the controller, in order to prevent the forma-
tion of condensation on the exposed pipes as
well as those concealed under the plaster we
recommend the use of a dew point monitor
(accessory).
It is also recommended to install a 230 V dewpoint
monitor with the associated pipe humidity sensors
to the feed pipes outside the heat pump. The loca-
tion should be selected so that it does not favour
the temperature falling below the dewpoint. The
switching contact of the dew point monitor must be
connected electrically in such a way that,
depending on the system layout, it interrupts the
power supply of the individual room controllers and
the heating cycle pumps or switches the valves of
the cooling mode.
Cooling without installed cable remote control
in the room
If no additional remote control apart from the heat
pump is to be installed in the room, the regulation
of the minimum inlet temperature is via the outside
temperature minus 6 K. It is then essential to
mount an additional 230 V dewpoint monitor with
associated pipe humidity sensors on the inlet
pipes. The location should be selected so that it
does not favour the temperature falling below the
dewpoint. The dewpoint monitor is wired so that it
divides the connector in the feed line to the utility
company switch to the controller (input S16) in
order to switch of the heat pump.
Cooling via a parallel buffer tank as a system
limit
If the system is operated using a parallel buffer
tank that acts as a system limit on the consumer
circuit, no remote control must be installed in the
living room if the regulation of the consuming
cooling circuit is operated via a third-party con-
troller.
Cooling via setpoint
If no additional remote control is installed in the
room, the cooling system can be operate at a set-
point that is above the dewpoint. It is recom-
mended to avoid inlet temperatures below 20 °C.
NOTICE!
Minimum water volume
If the system/water volume in the cooling circuit
provided by the customer is less than 5L/kW
cooling capacity, an additional buffer tank is rec-
ommended to increase the volume. This can be
incorporated as a serial buffer in the return flow
or as a hydraulic compensator. The KPS series
buffer tank can be supplied by REMKO for this.
REMKO series WSP
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