Technical data

Control and Regulation 7.5.2
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PAY SPECIAL ATTENTION TO:
With reversible brine-to-water heat pumps, even higher brine
inlet temperatures may be expected since the brine temperature
could rise significantly during cooling operation in the summer. At
higher heat source (brine) temperatures, the heat pump
generates a significantly higher heating output which must then
be transferred to the domestic water during hot water
preparation. This must especially be kept in mind in warmer
regions where more cooling than heating takes place.
Hydraulic integration via three-way reversal valve
(DWUS 25)
When the heat pump is used for hot water preparation, the
hydraulic integration of the hot water cycle must be achieved by
using a three-way reversal valve. This three-way reversal valve,
e.g. DWUS 25, must be ordered separately as an accessory.
Thermostat in the hot water cylinder (KRRV 003)
The hot water cylinder used must also be equipped with a
thermostat which generates the hot water request. When the
thermostat issues a hot water request to the control of the heat
pump, the latter switches the three-way reversal valve and hot
water preparation is enabled hydraulically. Switching the valve
sets the return set temperature to the maximum value for the
duration of hot water preparation.
7.5.2 Dew point monitoring in cooling operation
To prevent dew formation in the system during cooling operation,
a dew point monitor can be connected instead of bridge A1. This
dew point monitoring halts cooling operation in the entire system
if condensation forms at vulnerable points in the distribution
system. It can be used, for example, to monitor the heating circuit
manifolds.
NOTE
The shut-down by the dew point monitoring represents a safety cut-off;
the heat pump operation is only started again when the dew point
monitoring releases the heat pump again.
Dimplex accessories:
TPW WPM dew point monitor and
TPF 341 dew point sensor
The TPW WPM dew point monitor can be connected as a
monitoring unit to the regulation of the heat pump. Depending on
the demand, a connection of up to 5 dew point sensors on the
dew point monitor is possible. This interrupts the cooling
operation of the entire system if condensation forms at a dew
point sensor.
NOTE
The heat pump regulation has a 230 V AC supply. A power supply of 24 V
AC must be ensured via a transformer when using the TPW WPM dew
point monitor!
The supply lead of the dew point sensor to the dew point monitor
can be extended to 20 m using a "standard cable" (e.g. 2 x 0.75
mm) and up to 150 m when using a shielded cable (e.g. I(Y) STY
2 x 0.8 mm). Installation must always be carried out separately
from live cables.
PAY SPECIAL ATTENTION TO:
If condensate develops on one of the dew point sensors, the
cooling operation is interrupted until the dew point sensor has
dried again.