00_200_202_03_01_002_AIR85-EN | www.ochsner.com 23
Machine-specific engineering and preparation
DHW sensor (TB):
OCHSNER DHW tanks are fitted with appropriate sleeves
for installing the sensor.
»
Install the DHW sensor in the top third of the DHW
tank (or at least in the top half). The lower the se-
lected position of the DHW sensor, the larger the
switching hysteresis (5-15K) will need to be.
Information
Ensure that the DHW sensor is correctly positioned
and extends beyond the tank insulation into the
interior of the DHW tank. This is the only way in
which the temperature can be measured correctly.
Mixer sensor (TMK):
If, in addition to a direct heating circuit, your system also
has a heating circuit with mixing valve, then a mixer sensor
must be installed. The mixer sensor is supplied with the
heat pump, as a contact sensor including band clamp and
heat conducting paste.
»
Install the mixer sensor immediately downstream
of the heating circuit pump for the heating circuit
with mixing valve, on a (metal) pipe made of a good
heat-conducting material.
8.4.6 Pumps and servomotors (230 VAC)
Pumps (heating circuit pumps, DHW charging pump) and
servomotors (3-way switching module, mixing valve) are
connected directly to the OTE controller (1x 230 VAC power
supply).
Material damage
A test run of the pumps and servomotors may be
conducted only on a system that has been pre-
pared for commissioning. The hydraulics must be
fully connected.
8.4.7 PSU signal contact
Voltage present at the PSU
signal contact
Status
230 V
Heat pump enabled
0 V
PSU shutdown active
Tariff switching on the heat pump system
In the case of tariff switching (with interrupted power sup
-
ply), the heat pump is temporarily shut down by the power
supply utility (PSU).
Uninterrupted tariff
In the case of tariff switching with uninterrupted power
supply, the heat pump is temporarily shut down by the
power supply utility. A PSU signal contact is provided for
this purpose on the indoor unit. To activate this function, it
is necessary to remove a cable jumper in the control box
and connect the PSU signal contact cable.
Shutdown by means of a tariff contactor
In the case of shutdown by means of a tariff contactor
installed on site (sealed by the PSU), the power supply to
the heat pump compressor is disconnected. Here, it is es-
sential to connect an auxiliary contact to the tariff contactor
of the PSU signal contact on the indoor unit.
Night tariff
Where tariff switching takes place within the meter (night
tariff), the PSU signal contact is not connected.
8.4.8 Smart grid
For the smart grid function, special descriptions are avail-
able on request from your OCHSNER Customer Service
department.
8.4.9 High limit safety cut-out
When using surface heating systems (e.g. underfloor heat
-
ing, wall heating), provide an appropriate high limit safety
cut-out. In the event of a fault, this will directly interrupt the
heat generator pump.
»
Implement the contact as N/C contact.
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