17
Installation and maintenance manual ecoMAX 646
4.8.5 Wiring
diagram
Electronics box
Fan
230 V connection
Ignition electrode
Forward
flow NTC
Gas fitting
Water pressure switch
Return
flow NTC
9
8
7
5
4
3
N
L
N
L
Pump
Contact-
Therm
24V I
230V
RT 24V
230V
RT 230V
X 2/4 red
X 2/10 white
X 2/15 blue
X 2/8 black
X 2/20 black
X 4
X 10
X 7
X 6
X 2
X 2/9 red (22 VDC)
X 2/24 blue (earth)
X 2/12 blue (earth)
X 2/7 grey (PWM)
X 2/3 black (hall signal)
X 2/17 red (22 VDC)
X 2/23 black (earth)
X 2/6 brown (signal)
BW contact C1/C2
Cylinder NTC connection
or upper solar storage tank sensor
(plug colour: white)
Coding resistance
13
1
1
1
1
X 2/24 black (earth)
X 2/2 orange (signal)
Plug-in coupling
Plug-in coupling
Pump
Fig. 4.13 Wiring diagram ecoMAX 646
Start-up 5
