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HWK 332HC
7
Assembly
7.1 General
The following connections need to be made on the hydro tower
Flow / return of the heat pump
Flow / return of the heating system
Safety valve outflow
Voltage supply
Hot water pipe
Circulation pipe
Cold water pipe
NOTE
i i i i
When removing the unit cover, it must be taken into account
that the length of the connecting cable between the control
panel in the unit cover and the controller on the contact plate
is only 1.5 m. If the device cover can only be placed further
away than this when it has been removed, the plug
connection on the controller or on the control panel must first
be disconnected.
7.2 Heating system connection
The heating system connections on the hydro tower have a
1 1/4" flat-sealing external thread. A spanner must be used to
firmly grip the transitions when making the connections.
A dimensionally stable ¾" plastic hose (inner diameter approx.
19 mm) must be affixed to the hose nozzle, e.g. with a pipe
clamp, and guided outside the building in the area behind the
heat pump return.
Before the heating water system is connected, it must be
flushed to remove any impurities, residue from sealants, etc.
Any accumulation of deposits in the liquefier may cause the
heat pump to completely break down. For systems in which the
heating water flow can be shut off via radiator or thermostat
valves, the infinitely adjustable circulating pump carries out a
demand-related adjustment of the delivery height. The initial
filling and start-up must be carried out by an authorised spe-
cialist company. The entire system, including all factory-assem-
bled components, should be inspected to ensure that
everything is working properly and that there is no leakage.
The buffer tank and heating system must be filled via the filling
and drain cock on the hydro tower. The cylinder must be de-
aerated using the air-relief cock on the upper pipe connection
to the cylinder.
The isolation ball valve above the heat circulating pump (M13)
is equipped with a check valve with an "air lock". This makes it
possible for air to escape from the HWK's pipe system via the
check valve and into the connected heating circuit when the
ball valve is open. A suitable means of de-aeration must also be
installed in the heating circuit on site.
It is additionally recommended that an isolation device be in-
stalled in the heating return before integration into the HWK is
carried out. This isolation device should prevent excessive heat-
ing water loss if it becomes necessary to replace the "auxiliary
circulating pump" (M16).
If it is necessary to connect heating connection pipes to the
rear of the cylinder, these can also be laid underneath the cylin-
der.
It is possible to connect a second or third heating circuit (acces-
sory component "Manifold bar VTB). For this extension to be
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made, the heat circulating pump (M13) in the HWK must be re-
moved and replaced with a suitable adaptor (inner micrometer
180 mm).
The following pre-wired heating circuit modules (heating or
heating/cooling (C)) can be connected to the HWK 332HC:
Unmixed heating circuits: MHU(C) 25 with pump
Mixed heating circuits:MHM(C) 25 with pump
MHMC 25Flex without pump with fitting piece 180 mm
The installation of the heating circuits then takes place on-site
outside the HWK.
The condensate tray installed as standard means that the
Hydro-tower can also be used for cooling.
In this case, a drain hose must be installed on the tray.
NOTE
i i i i
If the pipes are more than 10 m long, the free compression
values stated in the device information must be observed
(minimum pipe diameter for volume flows of more than 1.5
m³/h: DN 32)
Minimum heating water flow
The minimum heating water flow of the heat pump is ensured
by the dual differential pressureless manifold in all operating
states of the heating system.
A method of manual drainage must be provided for heat pumps
which are exposed to frost. The frost protection function of the
Heat pump manager is active whenever the heat pump man-
ager and the heat circulating pump are ready for operation. The
system has to be drained if the heat pump is taken out of ser-
vice or if a power failure occurs. The hydraulic network should
be operated with suitable frost protection if heat pump systems
are implemented in buildings where a power failure cannot be
detected (vacation homes etc.).
7.3 Temperature sensor
7.3.1 Hydro tower HWK 332HC
The following temperature sensors are already installed or must
be installed additionally:
External temperature sensor (R1) supplied (NTC-2)
Return temperature (R2.1) installed (NTC-10)
Domestic hot water temperature (R3) installed (NTC-10)
452162.66.25-EN · FD 0402
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