Immergas MAGIS M4-30 Use And Installation page 45

NOTE
Wiring of the room thermostat S20-1 (for fan coils) and S20-2 (for floor supply circuits) must follow "method C" as
described in Chap. 9.7.6 Connection for other components/For the room thermostat, and the thermostat that is con-
nected to input "C" must be positioned in the zone where the floor heating circuits are installed (zone B), the other
connected to input "H" must be positioned in the zone where the fan coils are installed (zone A).
NOTE
• The volume of the balance tank (8) must be greater than 40 L. The drain valve (6) must be installed in the lowest posi-
tion of the water system. The pump (10) and pump (23.1) must be controlled by the heat pump and connected to the
corresponding port of the unit (Chap. 9.7.6 Connection for other components/For the external circulation pump P_o
and the feed pump P_c).
• The advantage of the double setpoint control is that the heat pump can operate at the lowest required water flow tem-
perature when there is only the floor heating demand. Higher water flow temperatures are only required when the fan
coils are operating. This makes the heat pump more efficient.
• Operation of the pump and space heating.
The pump (1.7) and (10) will operate when there is a heating demand from A and/or B. The pump (23.1) will only operate
when there is a heating demand from B. The heat pump will start running to reach the nominal water flow temperature.
The water outlet temperature depends on which room thermostat demands heating. When the room temperature of both
zones is higher than the setpoint of the thermostat, the compressor and circulation pumps stop.
NOTE
• Make sure to configure installation of the room thermostat correctly on the control panel. Chap. 10.5 Settings on field/
ROOM THERMOSTAT
• The installer is in charge of making sure that no unwanted situations occur (for example high-temperature water go-
ing to the floor heating circuits, etc.).
• The double setpoint control gives you the option of using only two setpoints.
• When only zone A requires heating, zone B will be fed with water at a temperature equal to the first setpoint. This
could lead to unwanted heating in zone B.
• When only zone B requires heating, the mixing kit will be fed with water at a temperature equal to the second setpoint.
Depending on the mixing kit control, the floor heating circuit can still receive water at a temperature equal to the
setpoint of the mixing kit.
• Keep in mind that the actual temperature of the water passing through the floor heating circuits depends on the control
and setting of the mixing kit.
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