Technical data

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Integration of the heat pump in the heating system 8.6
Electrical components :
 Switch box complete with heating contactor and connection
terminals
 Heat pump manager
(HWK 332Econ and HWK 332 Econ-E hydro towers only)
 2nd heat generator, electrical pipe heater, heat output
2 / 4 / 6 kW, secured via safety temperature limiter
 Unmixed heating circuit incl. controlled circulating pump
(infinitely adjustable or 3 stages), shut-offs and
back-pressure feature
 Primary circuit heat generation incl. circulating pump
(3 stages,), shut-offs
NOTE
The required expansion vessel and the matching pressure gauge are not
included in the scope of delivery and must be ordered separately.
Fig. 8.17: Design hydro tower HWK 332Econ
8.5.2 Field of application hydro tower HWK 332 /HWK 332 Econ/HWK 332 Econ-E
The hydro tower HWK is available in the versions HWK 332
(without heat pump manager), HWK 332 Econ (heat pump man-
ager WPM EconPlus) and hydro tower HWK 332 Econ-E (with
heat pump manager WPM EconPlus). The following table shows
the combination options for heat pumps and hydro towers.
Table 8.5: Combination options for hydro towers and heat pumps
NOTE
The hydro tower HWK 332 can also be combined with the high-efficiency
air-to-water heat pumps LA 6 to 17TU. In this case, the hydro tower must
be connected to the wall-mounted heat pump manager WPM EconPlus or
WPM EconPlus-E (with LA 6TU) in accordance with the installation in-
structions.
8.6 Buffer tank
A buffer tank connected in series is recommended for heat pump
heating systems, to ensure the minimum heat pump runtime of 6
minutes for all operating statuses.
Air-to-water heat pumps with defrosting by reverse circulation ex-
tract the energy required for defrosting from the heating system.
In the case of air-to-water heat pumps, a buffer tank connected
in series, into which the screw-in heater is installed, must be in-
stalled in the flow in mono energy systems to ensure defrosting.
With split air-to-water heat pumps, the buffer tank can be in-
stalled in the heating return, as these pumps have integrated
pipe heating.
NOTE
During the commissioning of a air-to-water heat pump the heating water
must be pre-heated to the lower operating limit of at least 18°C to ensure
defrosting.
ATTENTION!
An electric heating element which is fitted in a buffer tank must - as a heat
generator - be protected by fuse according to DIN EN 12828. It must also
be additionally equipped with an expansion vessel that cannot be shut off
as well as with a type-tested safety valve.
1 WPM EconPlus (not with HWK 332)
2 Heating return
3 Heating flow
4 Domestic hot water flow
5 Cold water inflow
6 300 litre domestic hot water cylinder
7 Electronically regulated circulating pump (M13)
8 Expansion vessel
9 Connecting pipe expansion vessel
10 100 litre series buffer tank
11 Domestic hot water circulating pump (M18)
12 Switchable pipe heater (2/4/6 kW)
13 Uncontrolled auxiliary circulating pump (M16)
9
4
5
8
6
10
1
12
7
1
1
13
2
3
Order reference For device type
HWK 332
LA 11TAS (LA 11MAS)
LA 11 to 22PS
LI 9TES, LI 11TES,LI 20TE
SI 6 to 11TU
SIH 5 to 11TE
WI 10TU, WI 14TU
HWK 332 Econ LA 9TU, LA 12TU, LA 17TU
HWK 332 Econ-E LA 6TU