Vaillant ecoMAX SERIES Instructions For Installation And Servicing page 25

4.16.3 Electronic board layout (continued)
NTC
flow
X 2/4 red
X 2/10 white
X 2/15 blue
Plug-in coupling
Water Switch
Pump
X 4
1
1
13
X 6
Electronic control box
Fig. 4.16 Connection wiring ecoMAX 824/2, 828/2
Instructions for installation and servicing ecoMAX
NTC
backflow Ignition electrode
Gas valve assembly
X 2/9 red (22 VDC)
X 2/24 blue (earth)
X 2/13 red (+ 5V)
X 2/23 black (earth)
X 2/1 green (signal)
X 7
1 1
X 2
Coding resistance
Boiler installation sequence 4
X 2/12 blue (earth)
X 2/7 grey (PWM)
X 2/3 black (Hall signal)
X 2/17 red (22 VDC)
X 4/1 black A
X 4/4 blue B
X 4/3 brown C
X 4/2 pink D
Aqua sensor
24V I
230V
7 8 9
L N 3 4
Contact
therm
RT 24V
230V RT 230V
Fan unit
Priority reversing valve
NTC
Hot water outlet
X 2/19 violet (signal)
5 L N
Pump
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