Viessmann WB2B 45 - Page 61

Additional Information
61
Ladder Diagram
Legend
-X1 [40] power supply 120 VAC
-X1 [20A] pump, HTG system w/o
mixing valve, 120 VAC
-X1 [21] pump DHW tank 120 VAC
-X1 [20] pump boiler 120 VAC
-X1 [50] fault alarm 120 VAC
-X2 [28] pump, DHW recirculation,
120 VAC
Total max. output current 8A
-X3 boiler power supply 230
VAC
-K1, -K2,
-K3, -K4,
-K5 operating contacts
-F1, -F2 fuses (slow blow)
-T transformer
H1 communication board
Fig. 55
T3.5A
300VA
5418 909 v1.6
IMPORTANT