User Manual
Installation & Operation Manual
12 Diagrams
Figure 12-2 Ladder Diagram_Part 2
BOX DEPICTS
OPTIONAL ITEMS
120 VAC
24
VA
C
120VAC
TERMINAL STRIP
120V SUPPLY "L"
ON / OFF
SWITCH
X1-6
B
O
ILER PU
MP
R
E
LA
Y
D
HW PUM
P
R
ELAY
SYS
T
EM
P
U
MP
R
EL
A
Y
BL
O
WER
R
ELA
Y
X
1-4
X1-2
X
1
-
1
12
3
BLOWER
X
1
-
5
X
6
-
8
X6-3
F5
X5-7
X6
-
7
NEUTRAL
TERMINAL STRIP
120V SUPPLY "N"
J
UNC
TIO
N
BOX
X1-8
CONNECTIO
N
BOAR
D
5A
F4
3.5
A
F2
3.5A
F3
1.25A
CONTROL MODULE 1
GROUND
JUNCTION BOX
120 VAC
LOW VOLTAGE
HIGH VOLTAGE
5
9
X6-2
NOTES:
1. Where possible, switch
es
are shown without utilities (gas, water or
electricity) connected
t
o the unit. As such, actual sw
itch
st
ates may
v
a
ry from those sho
wn on diagrams depending upon whether utilities
are co
nn
ected or a faul
t cond
i
tion is present.
2. See wiring dia
gram for
add
itional notes.
BOILER
PUMP
BOILER
PUMP
H
EX 1
BO
ILER PU
MP
R
EL
A
Y
SYSTEM PUMP
RELAY
HEX 1
BOILER PUMP
C
ONT
A
CTS
H
EX 2
BOILER PUM
P
C
ONTA
CT
S
SYS
TE
M
P
U
M
P
CONTACT
S
L1
N
120 V
AC
24 VAC
O
N / OFF
SW
ITC
H
X
1-6
BOILE
R
PU
MP
R
ELAY
D
HW PUM
P
R
ELAY
SYSTEM PU
MP
R
ELAY
BLOWER
R
ELAY
X
1
-
4
X
1
-
2
X1-1
12
3
BLOWER
X6-8
F5
X5-7
X
6-7
J
UNC
TIO
N
BOX
X1-8
5A
F4
3.5A
F2
3.5A
F3
1.25A
CONTROL
M
ODULE 2
X6
-
2
H
EX
2
BOILER
PUMP
R
ELAY
JUNC
TION BO
X
LWCO
J3-2
7
1
1
1
3
LWCO
J
3
-
4
LOUV
E
R
PROVING
H
EX
1
F
LOW
SW
ITC
H
H
EX
2
FLOW
SW
ITC
H
H
W
THE
R
MOST
AT
E
N
ABLE
CONNECTIO
N
BO
A
R
D
CONTROL
MO
DUL
E 1
X6
-
1
0
CO
N
TROL
MODULE 2
X6-9
X6-1
X
6
-6
X
6
-
1
0
X6-9
LOW GAS
PRESSURE
SW
ITC
H
CON
TROL
M
ODULE 2
X6-5
CON
TROL
MODUL
E 1
X6-5
D
HW PU
MP
R
ELAY
(
FI
E
L
D
SU
PP
LIED
)
D
HW
PU
MP
D
HW
PUM
P
D
HW
PU
MP
CON
TA
C
TS
(FIEL
D SUPPLIED)
X1-3
X1-3
J
3-5
J
3-6
RUN TIME
CON
TACTS
RUN TIME
CON
TACTS
A
LAR
M
CON
TA
C
TS
X3-2
X
3
-4
X
3
-1
X3-3
X
3-2
X3-4
X
3-1
X3-3
3
JUNCTION BOX
HIGH GAS
P
R
ESSURE
SW
ITC
H 1
HIGH GAS
PRESSURE
S
W
ITCH
2
CN1-4
CN1-12
CN1-13
6
1
0
8
12
1
4
4
3
1
2
CN1-7
CN1
-
8
CN1-1
0
CN1-15
CN1
-11
CN1
-
3
CN1
-6
CN1
-
5
CN1-6
TEST SWITCH
PROB
E
J
3-3
LOUVER
CONTACTS
SYSTEM
PUMP
LOUVER
MOTOR
LADDER DIAGRAM
L
BL20046 REV G
64