Vaillant flexoTHERM exclusive VWF 117/4 Installation And Maintenance Instructions Manual page 27

12 [X100/BUS] Bus connection (VR 900)
13 [X20] Data connection to mains connection PCB and
power supply for the in-rush current limiter
14 [X14] Circulation pump connection
15 [X15] Connection for internal 3-way valve for hot
water (DHW)
16 [X13] Internal brine pump connection
17 [X16] Internal heating pump connection
18 [X11] Connection for internal 4-way valve
0020213394_01 flexoTHERM exclusive Installation and maintenance instructions
Electrical installation 8
19 [X1] 230 V supply for controller PCB
20 [F1] F1 T 4A/250 V fuse
21 [X12] Edge connector for 230 V supply for optional
VR 40
22 [X22] Connection for sensor cable harness (includ-
ing connection for internal VR 10 cylinder temperat-
ure sensor and EVI valve)
23 [X21] Connection for sensor cable harness
24 [X90] (not used)
27