Ochsner AQUA 54, Operating Instructions & Installation Instructions

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BA OCHSNER AQUA TERRA_EN_V01.1.docx Page 13 of 72
5.3.2 Passive cooling version
In water/water heat pumps with passive
cooling applications,
it is essential that each cooling circuit has its
own mixing valve as well as
a room remote control to limit the dew point.
The diverting valve in the passive cooling
mode MUST be installed in the heat
pump's evaporator outlet.
Corresponding
circuit diagrams are part of the scope of sup-
ply of every heat pump.
5.4 Sizing fundamentals
Please observe the following sizing fundamentals.
The flow rate in the pipe-network must not
exceed 0.8 m/s. (noise/resistance)
.
In order to ensure a comfortable and disturbance-
free operation, a temperature difference of 5K be-
tween the heating system flow and return is to be
maintained.
Fig. 7: Hydraulic heat pump connection
When sizing the heating system
pump/buffer charge pump, the internal
pressure differential of the heat pump
condenser is to be taken into consider-
ation (see technical data Pet seq)!
If this is not done, there is a danger that the heat
pump will not reach the specified catalogue rating
and under certain conditions will be shut off by
means of the high-pressure switch,
→
ERROR re-
port (see operation instructions OTE).
Integrated heating system circulation pumps are
sized as buffer charge pumps (technical data
– see
annex).
It is recommended to install a decoupling tank
(separation tank, buffer tank) or a header tank
with the heat pump. A bleeder valve (manual
bleeding) must be fitted at the highest point in the
pipework system.
It must be ensured that no foreign bodies can en-
ter the pipework (dust, dirt, etc.). A filter sieve can
be mounted in the return pipework to the heat
pump in order to collect any dirt. Make sure that
the dirt collector is easy to clean for maintenance
purposes.
A clogged sieve affects the heat transfer consider-
ably and can lead to a switch off via the high-pres-
sure safety switch! Valves and thermometers are
to be fitted to the flow and return pipework so
that the water flow and the running condition of
the heat pump can be monitored at all times. A
drain pipe is to be installed at the lowest point in
the pipework so that the system can be drained.
The heating system pipework is to be sized ac-
cording to the technical data of the heat pump.