AM, EM, AQ, BA, ASW - IOM
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í Jiránek
5.9 Preparation of Domestic Hot Water (DHW)
There are several ways to prepare DHW using the heat pump. Following table lists options for
individual heat pumps.
heat pump
type/model
3 way valve
tank in tank
3 way valve
tank with heat
exchanger
charging pump
tank with heat
exchanger
partial heating in
buffer,
supplementary
electric
AM AKU, LM
no
no
yes
yes
AM MINI, EM
yes
no
(yes***)
yes
yes
AQ
yes
yes*
yes
yes
BA, BAxxI(C),
yes
yes**
yes
yes
* minimum heat transfer area of 2-3m
2
/10kW of the heating output of the heat pump
** deactivation of DHW in defrost mode must be activated in heat pump controller
***it is possible with pCO5 controller, although it is not recommended, deactivation of DHW in
defrost mode must be activated
5.9.1 3 way valve tank in tank
This type of heating is universal for all MINI units. The advantage is higher temperature of DHW
achieved than in the non-direct heating boiler, typically 50 to 55°C. Another advantage is easy
connection to hot water solar collectors and using the higher temperature of heating water for
the circuit of towel radiators or seasonal heating of a pool.
tap water inlet / DHW outlet
DHW internal tank
optional high temperature pump circuit
3 way valve
from heat source
optional solar thermal
heating water
heat exchanger
5.9.2 3 way valve with tank with heat exchanger (indirect, non-direct)
Using the heat pump with non-direct heating tank can usually achieve temperature 45 to 50°C.
The limiting factor is mainly the heat transfer area of the exchanger which must be sufficient for
heating output of the heat pump. The minimum area is 2-3m
2
/10kW of heating output of the heat
pump. Therefore the usage is limited for commonly available types of exchangers. For heat
pumps
AM, EM, BoxAir
a
BoxAir Inverter
deactivation of DHW in defrost mode must be
activated in heat pump controller.
