Instruction Manual
35
6.1.7 Ionisation current measurement
To measure ionisation current, perform the following actions:
•
switch boiler to STANDBY mode
•
disconnect the cable from the electrode
•
connect an ammeter (μA range) according to the illustration in Fig. 6.1.7.1
•
switch the boiler to C.H. mode
•
read the value of the ionisation current
Fig. 6.1.7.1 Wiring diagram for ionisation current measurement
NOTE!
The ionisation current should be equal to or higher than 2 μA.
6.2 REPLACING A DAMAGED CONTROL BOARD IN THE CONTROL PANEL
If the control board needs to be replaced, follow the installation instructions attached to each board assigned as a spare part.
Parameters of components for X BOILER 23 and 38
Item on the scheme
Name
Parameters
Supply voltage from the
controller
5
Fan NG40m
Power:75W(max)
230V AC
7
Pump Yoyos Para PWM
Power: 45W
230V AC
8
Gas unit SIT SIGMA 848
Valve coil resistance: 3-4EV1:
0,9kΩ 1-3EV2: 6,4 kΩ
230V AC
18
NTC sensor of CH water
temperature
10K@25ºC ß=3977
SELV
19
Heating water pressure
transducer
The output voltage: 0,5V to
2,5V (0 bar - 4 bar)
5V DC
26
Domestic water flow sensor
pin
SELV
27
NTC sensor of DHW water
temperature
10K@25ºC ß=3977
SELV
28
NTC sensor of CH water
temperature - return
10K@25ºC ß=3977
SELV
42
NTC sensor of out door
temperature
10K@25ºC β=3977
SELV
15
Temperature limiter 95C
pin
SELV
16
Thermal fuse
pin
SELV
12
3-way valve
3-way valve
230V AC
