Immergas MAGIS M4-30 Use And Installation page 41

• Operation of the circulation pump.
The circulation pump (1.7) and (10) runs as long as the unit is on for space heating.
The circulation pump (1.7) runs as long as the appliance is on for domestic hot water (DHW) heating.
• Space heating.
1) The unit (1) will run to reach the water flow temperature set on the control panel.
2) The bypass valve must be selected so as to always guarantee the minimum water flow as indicated in Chap. 9.4 Water
pipes.
• Domestic hot water heating.
1) When domestic hot water heating mode is enabled (both manually by the user and automatically by the schedule) the
target temperature of the domestic hot water will be reached by a combination of coil heat exchanger and electric booster
heater (when the booster heater (TBH) in the tank is set at YES).
2) When the domestic hot water temperature is lower than the setpoint configured by the user, the 3-way valve is activated
to allow the heat pump to heat the domestic hot water. If there is an enormous demand for hot water or a high temperature
of the hot water, the booster heater (12.3) can supply auxiliary heating.
CAUTION
Make sure to install the 3-way valve correctly. For further details, see Chap. 9.7.6 Connection for other components/
For 3-way valve SV1.
NOTE
The unit can be configured so that, at low outdoor temperatures, the water is only heated by the booster heater. This
allows the heat pump to be available at full capacity for space heating.
Details on the configuration of the storage tank of domestic hot water for low outdoor temperatures (T4DHWMIN)
can be found in 10.5 Settings on field/DHW mode setting.
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