Immergas MAGIS M4-30 Use And Installation page 32

8.1.1 With Indoor unit backup heater.
Outdoor
Code
1 Main unit
2 Control panel
3 Sv1: 3-way valve
4 Balance tank
4.1 Automatic air purge valve
4.2 Discharge valve
5 P_o: External circulation pump
7 P_d: Pump for DHW pipes
8 T5: DHW temperature sensor (accessory)
9 T1: Total water flow temperature sensor (optional)
10 Expansion vessel
11 Domestic hot water tank
IBH (Indoor unit backup heater) control.
The IBH function is set on the main hydronic board (Chap. 10.1 Overview of DIP switch settings).
1) When the IBH is set so as to be valid only for heating mode, the IBH can be activated as follows:
a. Activate IBH by means of the BACKUP HEATER function on the control panel;
b. The IBH will be activated automatically if the initial temperature of the water is too low or if the target water temperature
is too high at a low room temperature.
P_o keeps running as long as IBH is ON, SV1 remains OFF.
2) When IBH is set so as to be valid for heating mode and DHW mode.
In heating mode, the IBH control is equal to part 1).
In DHW mode, IBH will be activated automatically if the initial temperature of the domestic hot water T5 is too low or the
target domestic hot water temperature is too high at a low room temperature.
P_o stops, SV1 remains set at ON.
Modbus
Assembly unit
Indoor
Code
11.2 Coil, heat exchanger for heat pump
12 Filter (accessory)
13 Control valve
14 Cut-off valve
15 Filling valve
16 Discharge valve
17 Tap water inlet pipe
18 Hot water cock
19 Manifold/distributor
20 Bypass valve
FHL
Floor heating circuit
1... n
IBH Indoor unit backup heater
32
Assembly unit