A.O. Smith DRE 52 Installation And User Instructioins page 16

Electrical diagram –
3 phases – 9 elements
A = Network connection
B = Fuses
C = Relay
D = Fuse
E = Transformer
F = Safety relay
G = Float switch
H = Maximum thermostat
K = Regulation thermostat
L = Electrical heating
element
X1 = Terminal block
1 = Black / Zwart / Schartz / Noir
2 = Red / Rood / Rot / Rouge
3 = Blue / Blauw / Blau / Bleu
4 = Brown / Bruin / Braun / Brun
5 = Yellow / Geel / Gelb / Jaune
DIAGRAM C: Electrical diagram – 9 elements
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