3 overview – Honeywell SDC User Manual
Page 11
SDC / DHC
Overview
EN2H-0220GE51 R0308
11
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
Nu
mber o
f ou
tput
rel
ays
Bur
n
er
stage 2
or
District he
at
ing
va
lve
CL
OSED
Bur
n
er
stage 1
Direct heating circuit
V
ari
ab
le
ou
tp
ut 3
Mixed
heating circuit 1
Mixed
heating circuit 2
Tank load
in
g
pu
mp
V
ari
ab
le
ou
tp
ut 2
V
ari
ab
le
ou
tp
ut 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
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