Bosch SSB255 - Electrical Wiring Diagram

SSB 6720818454 (2016/02) US
Installation | 21
4.5.5 Electrical wiring diagram
Fig. 21 Wiring diagram
bl
24 V
24V
L
N
brn
brn
brn
brn
brn
blu
w
blu
blu
brn
blu
brn
blu
bl
bl
brn
w
w
w
9
7
8
CASCADE
LINK
65
12
10
11 12
Room
brn
blu
brn
blu
brn
blu
brn
blu
N
118
L
116
117
13
14
brn
blu
w bl
N
L
103101102
106104105
115113114
NL
113114115
SSB512 ONLY
SSB255 ONLY - SSB399 ONLY
NL
brn
w bl
w
w
bl
w
bl
brn
blu
NL NL
NL L
109107108
112
110
111
GND
GND
GND
bl w
bl
w
w
bl
bl w
w
w
w
bl
bl
w
bl
bl
w
bl
blubrn
blblugbrn
34
bl
bl
blu
brn
o
blu
GND
Ther-
mostat
Manual Reset Switch
(Normally Closed,
Opens to Reset)
Alternate Chassis
Ground Connection
External Test Switch
(Normally Closed,
Opens to Test)
RESET
GND
AC COMMON
TEST
24 VAC HOT
PROBE
P
CHASSIS
GROUND
(Via Boiler / Piping)
AR1
AR1
120V
24V
210
210
210
208
208
208
209
209
209
214
214
214
HIGH VOLTAGE
LOW VOLTAGE
IN / OUT
HIGH
Tank
Sensor
OUT
DOOR
MOD
BUS
GAS
SWITCH
120 V
MAIN IN
Supply
Sensor
HIGH VOLTAGE
OUT
MAIN PUMP
120 V AUX
PRESSURE
SWITCH
MIN
PRESSURE
SWITCH
MAX
ALLARM
VOLTAGE
PRESSURE
SWITCH
FLUE
PUMP CH
3 WAY
PUMP DHW
DHW
brn= CABLE BROWN
blu= CABLE BLUE
bl= CABLE BLACK
w= CABLE WHITE
o= CABLE ORANGE
g= CABLE GRAY
L= LINE
N= NEUTRAL
grn/yel = Ground