Honeywell SDC - 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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