Circulation Pump - Immergas MAGIS COMBO PLUS V2 Series Instructions And Recommendations For The Installer

1.36 CIRCULATION PUMP

The indoor unit is supplied with two circulator pumps, one for the
heat generator and another for the heat pump mode.
Circulator pumps run at variable speeds and operate as follows:
- Fixed ("A 05" = 0): The heat circulator pump speed is fixed and
corresponds to parameter "A 04". The heat generator circulator
pump speed is fixed and corresponds to parameter "A 19".
- ΔT constant ("A 05" = 5 K): the heat circulator pump speed var-
ies to maintain ΔT = 5 K constant between the system flow and
return. Also, you can adjust the pump operating range, by set-
ting the maximum speed "A 04" and the minimum speed "A 03".
The heat generator circulator pump speed varies to maintain ΔT
= "A 05" constant between the system flow and return. Also, you
can adjust the pump operating range, by setting the maximum
speed "A 19" and the minimum speed "A 18".
For proper system operation, make sure that the mini-
mum flow rate in operating conditions never drops be-
low 500 l/h.
Head available to system (Heat generator circuit)
80
70
60
50
Y1
40
30
20
10
0
0
Key (Fig. 45):
X1 = Flow rate (l/h)
Y1 = Head (kPa)
Y2 = Circulator pump absorbed power
(W)
1
A
2
200 400 600
1 = Maximum speed (100%)
2 = Minimum speed (70%)
Pump LED.
The LED flashes green when the pump is powered and the pwm
control signal is connected.
The LED lights up steady green when the pump is pow-
ered and the signal cable disconnected. In these condi-
tions the pump works at maximum and without control.
If the pump detects an alarm, the LED switches from green to red;
this can mean one of the following failures:
- low supply voltage;
- rotor seized;
- electrical error.
For a detailed description of the meaning of the red LED, refer to
(Parag. 3.13).
The LED, in addition to being green or red, can also re-
main off.
It is normal for the LED to be off when the pump is not
powered, whereas with the pump powered, the LED
must be lit: if switched off, it means there is a fault.
Pump release.
If after a long period of inactivity, the circulator is blocked, adjust
the screw in the centre of the head in order to manually release the
motor shaft.
Take great care during this operation to avoid damage to the mo-
tor.
B
800 1000 1200
X1
80
70
60
50
Y2
40
30
20
10
0
1400 1600
A = Head available to the system
B = Power absorbed by the circulator
pump (dotted area)
45
41