Immergas MYTHOS HP - Circulation Pump

34
INSTALLER
USERMAINTENANCE TECHNICIAN
TECHNICAL DATA
1.27 CIRCULATION PUMP
e appliance is supplied with built-in pump.
e pump works at a xed speed both in central heating and in
DHW.
Pump LED.
When the pump is powered, the LED lights up with a steady green
light.
When the pump is switched on, the green LED ashes at
higher intensity and then returns to normal intensity
with a steady green light.
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
Paragraph 3.6.
e LED, in addition to being green or red, can also re-
main o.
It is normal for the LED to be o when the pump is not
powered, whereas with the pump powered, the LED
must be lit: if switched o, it means there is a fault.
Pump release.
If aer 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 sha.
Take great care during this operation to avoid damage to the mo-
tor.
Bypass Adjustment (Parag. 1.29).
e boiler leaves the factory with the bypass open.
If necessary, the by-pass can be regulated to system requirements
from minimum (by-pass closed) to maximum (by-pass open).
Adjust using a at head screwdriver, turn clockwise and open the
by-pass, anticlockwise it is closed.
e by-pass ensures minimum circulation of the water
in the boiler and correct operation of the appliance if the
systems are divided into more than one zone.
Total head available to the system.
Head (kPa)
0,0
5,0
1
0,0
1
5,0
2
0,0
2
5,0
3
0,0
3
5,0
4
0,0
4
5,0
5
0,0
5
5,0
60,0
0
100 200 300 400 500 600 700 800 900 1000 1100 1200 1300
0,
0
5,
0
10,
0
15,
0
20,
0
25,
0
30,
0
35,
0
40,
0
45,
0
50,
0
55,
0
60,0
A
B
C
D
Circulator pump absorbed power (W)
Flow rate (l/h)
34
Key (Fig. 34):
A = Head available with by-pass excluded
B = Head available with by-pass engaged
C = Power absorbed by the pump with bypass engaged (dotted area)
D = Power absorbed by the pump with by-pass excluded (dotted area)