Back-up operation if defrosting the outdoor unit
When the outdoor unit is undergoing defrosting, the control unit ensures
full protection of the system by starting up the back-ups if necessary.
Additional protection is provided if the water temperature falls too sharply.
In this case, the outdoor unit is shut down.
Operating principle when the outside temperature falls below
the operating threshold of the outdoor unit
If the outside temperature is below the minimum operating temperature of
the outdoor unit as defined by the HP051 parameter, the outdoor unit is
not permitted to operate.
If the system has a demand pending, the back-up or electric boiler starts
up immediately to guarantee heating comfort.
10.4.2 Setting the switch between heating and production of do
mestic hot water
The system does not allow the simultaneous production of heating and do
mestic hot water.
The switch logic between domestic hot water mode and heating mode op
erates as follows:
Fig.106 Domestic hot water temperature curve
MW-5000541-1
1
2
3
4
5
A
A
B
B
B
T
t
Cp
D
Tp
0
A DP048 Minimum heating time before Domestic Hot
Water production
B DP047 Maximum time allowed to produce Domestic
Hot Water
Cp DP070 DHW comfort temperature setpoint or DP080
DHW reduced temperature setpoint
T Temperature
Tp DM006 Domestic hot water temperature
t Time
D DP120 Hysteresis temperature relative to the DHW
temperature setpoint
Live
Operating description
1
Domestic hot water production only. When switching on, if domestic hot water production is enabled and
acceleration of domestic hot water production is not required (DP051 set to 0), a domestic hot water pro
duction cycle starts for a maximum duration that can be adjusted and set by the DP047 parameter.
In the event of insufficient heating comfort, the heat pump is running too long in domestic hot water
mode: reduce the maximum duration of domestic hot water production.
2
Heating only. Production of domestic hot water is off. Even if the domestic hot water set point is not
reached, a minimum heating period is forced. This period can be adjusted and defined with the DP048
parameter. After the heating period, tank loading is again enabled.
3
Domestic hot water production only. When the domestic hot water set point is reached, a period in heat
ing mode begins.
10 Settings
88
AWHP-2 iMPI
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