DATE
REV.
NAME
CHANGES
REVISION
LOCATION:
Document created with version :
CONTRACT N° :
SCHEME
04
L1
Main Panel
BCB Layout
1
2016.0.0.114
User data 2
1
0
Brian
Brian
11/15/2017
10/10/2017
Updated wire colors & AWG
X2
1
1
X2
1
X7
1
1
1
X1
3
X4
X5
X22
SG
E-Stop
Safety
Add
Sensor
Tank
(B
) O
ut
1
1
X3
X15
1
X1
7
1
1
X9
1
1
X16
X25
1
1
X8
X2
6
X1
2
1
1
X6
X1
0
(B
) I
n
(A
)
In
Therm
Room
Demand
Heat
Fault
(+)
0-10 Vdc
(-)
Sensor
Outdoor
Sensor
External
Cascade
(A
) O
ut
Hi
gh
L
im
it
&
Ou
tle
t S
ens
or
Ga
s
Pre
ss
ure
Tr
an
sd
uc
er
Flue
Se
ns
or
Ret
ur
n
Se
ns
or
Fa
n
Pre
ss
ure
Tr
an
sd
uc
er
Out
let
P
re
ss
ur
e
Tr
an
sd
uc
er
Bl
oc
ke
d
Dr
ai
n
Tr
an
sd
uc
er
Inl
et
P
re
ss
ur
e
Tr
an
sd
uc
er
SW
1
L
N
3
Ignition Transformer
03-11
03-12
03-13
03-14
03-3
03
-2
03
-3
Optional
3-Way Valve
J15
CN12
Fan
Optional
PWM Pump
03-2
BDB
+
-
B/OT A/OT
04
-4
04-
13
04
-4
04-
13
04
-4
04-
13
04
-4
04-
13
04
-6
04-
12
04
-6
04-
12
04
-6
04-
12
04
-6
04-
12
Rear Wall Limit Switch
Door Limit Switch
LW
CO
Optional
See LWCO Wire
Diagram For Details
04
-4
04-
13
18
Yellow
18
Ye
llo
w
22
Black
22
Brown
22
Black
18
Red
18
Red
18
Red
22
Blue
22
Blue
22
Brown
22
White
18
Red
22
Green
22
Red
22
Black
18
Black
18
White
18
Black
18
White
18
White
18
Black
18
Black
18
White
18
Black | White
18
Bl
ac
k
18
W
hi
te
18
Gr
een
22
Red
22
Green
18
Black
22
Black
22
Green
22
Red
22
Green
22
Black
22
Red
18
Green
22
Blue
22
Red
22
Black
22
Re
d
| B
lac
k
22
Re
d
| B
lac
k
22
Ye
llo
w
|
Bl
ac
k
22
Ye
llo
w
|
Bl
ac
k
22
Vi
ol
et
22
Vi
ol
et
18
Ye
llo
w
18
Ye
llo
w
18
Ye
llo
w
18
Ye
llo
w
18
Bl
ac
k
18
Bl
ue
|
W
hi
te
18
Bl
ue
|
W
hi
te
22
Gr
ey
22
Gr
ey
22
Orange
22
Orange
22
Green
22
Black
22
Red
22
White
22
Red
18
Red
03-3
11
PART 2. ELECTRICAL
B. INTERNAL WIRING CONNECTION (continued)
(FIGURE 2-1) .2 FIELD WIRING CONNECTIONS
A. Outdoor Sensor — outdoor air
sensor, set point will adjust
based on outdoor air temperature
(not needed if 0-10 VDC output is
connected)
B. External Sensor Connection —
system temperature sensor,
senses water temp in a heating
loop.
C. Tank Sensor — Sensor for indirect
or direct DHW. An aquastat may
also be connected here.
D. 0–10 VDC — connect a 0–10
VDC output here to vary set point
temperature.
E. Additional Heat Demand —
dry contacts that will close a
thermostat on an extra heater/
boiler if the boiler is at 100% of
capacity.
F. Fault Service — alarm bell or light
may be connected here to indicate
that the boiler is a hard lockout.
G. Room Thermostat — normally
jumped. A room thermostat may
be connected here to enable/
disable the heater/boiler.
H. Cascade Connection —
communication cables get
connected here and “daisy
chained” to all heaters/boilers in a
cascade. This is polarity sensitive.
I. 3-Way Diverter Valve — Used
in a boiler system with both
Heating and Indirect Hot Water.
J. P2 — Pump for indirect. Used in
a boiler system with both
Heating and Indirect Hot Water.
K. P1 — Wire to primary pump for
boilers and heaters.
L. P3 — Wire to system pump
for boilers.