Overview
SDC / DHC
20 EN2H-0221GE51
R0808
3 Overview
The modular SDC / DHC control device is available in an
installable switch cabinet version and a surface-mounted wall
version with the following equipment features:
Type
Number of output relays
Burner stage 2
or
District he
ating valve
CLOSED
Burner stage 1
Direct heating circuit
Variable output 3
Mixed heating circuit 1
Mixed heating circuit 2
Tank loading pump
Variable output 2
Variable output 1
SDC 3-10
3
–
x
x
–
–
x
–
SDC 3-40
3
–
–
–
x
–
–
–
–
SDC 7-21
1)
7
–
x
x
x
–
x
–
–
SDC 9-21
2)
7
+ two
variable
relays
x
x x
x
– x x x
SDC 12-31
3)
10
+ two
variable
relays
x
x x
x x x x x
1)
DHC 43-1
2)
DHC 43-2
3)
DHC 43-3
