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Design of the hydraulic circuit
The ATW Mini heat pump is designed with respect to the easiest way of installation. All important elements of
the hydraulic circuit are integrated in the indoor unit. The indoor unit contains an efficient circulation pump, an
exchanger and a flow sensor. The design of the hydraulic circuit must take high demands of heat pumps
into consideration for sufficient flow of the heating water (see Fig. 1).
The heat pump can operate without an accumulation tank. In this case, the following requirements must be
kept: the heat pump mustn´t be disconnected from the heating system; the heat pump must have sufficient
amount of thermal energy, which is taken back during the defrosting of the outdoor unit.
We do not recommend using thermostatic valves or mixing tools (typically 4-way valve). The heating water
temperature regulation in the heating system is determined by the heating curve regulation included in the
controlling system of the indoor unit. If there is a need to use regulation components which are regulating more
than 50% of the heating water flow, the storage tank must be used. In no case do we recommend using the
hydraulic compensator of dynamic pressures (balancing vessel) for connection of the heat pump to the heating
system. When it is used, the efficiency of the heat pump is significantly worsened owing to its temperature drop.
The balancing vessel is used only for connection of the bivalent source (if necessary) to the heating water circuit.
Low flow
Parameters of hydraulic capacity of the indoor unit (unit with equipment)
Flow capacity m /h
3
Fig. 1
33
Sufficient flow
MINI 5
MINI 8, 11
MINI 14, 16 (HP)
Pipe dimensions:
D = inside diameter
mm
(mm)
P= capacity (kW)
Copper piping (flow
0,7 m/s, temp. drop 6°C)
D =( P*0,00127) * 200
mm
Lead piping (flow
1 m/s, temp. drop 6°C)
D =( P*0,00181) * 200
mm
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