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12
Diagrams
Figure 12-6 Wiring Diagram_5.0 Model
MODBUS
OPTION
RATE
OUT
BOILER
PUMP OUT
SYSTEM RETURN
SENSOR
SYSTEM SUPPLY
SENSOR
SENSOR
OUTDOOR
SENSOR
BMS
SYSTEM
PUMP IN
CASCADE
ALARM
CONTACTS
RUN-TIME
CONTACTS
THERMOSTAT
ENABLE
LOUVER
PROVING
24 VAC LOUVER
RELAY COIL
SWITCH 1
SWITCH 2
(continued)
MODBUS
BOARD
X1-1
LARGE CONNECTION BOARD
X1-2
X1-3
17
CN6-3
G
Y
X6-3
SHIELD
18
CN6-2
R
X6-1
A
19
CN6-1
P
R
X6-2
B
20
X4-1
SHIELD
+
21
X4-2
0-10V
-
22
X4-3
CN3-4
+
23
0-10V
CN3-6
-
24
CN3-7
25
CN3-14
26
CN3-13
27
CN3-12
28
CN3-11
29
TANK
CN3-10
30
CN3-9
31
CN3-8
32
CN3-1
+
33
0-10V
CN3-2
IN
-
34
CN3-3
+
35
0-10V
CN3-5
-
36
SHIELD
37
38
A
INLET SENSOR
B
39
SHIELD
40
OUTLET SENSOR (S9)
OUTLET SENSOR (S1)
FLUE SENSOR
FLUE SENSOR (S10)
LCD
DISPLAY
PRE-MIX SENSOR 1 (S11)
PRE-MIX SENSOR 1 (S13)
PRE-MIX SENSOR 2 (S12)
PRE-MIX SENSOR 2 (S14)
CN3
DU941
CN1
SMALL CONNECTION BOARD
1
2
3
CN1-4
4
CN1-5
5
CN1-6
TANK
6
CN1-12
R
7
CN1-10
W
8
CN1-11
9
CN1-9
10
CN1-8
11
CN1-7
12
CN1-1
HIGH LIMIT
13
CN1-2
AUX
SWITCH
14
CN1-3
R
15
AUX
16
LWCO
BOARD
J3-6
J3-5
LWCO
TEST
J3-4
PROBE
SWITCH
OR/BK
OR/BK
J3-3
J3-2
LWCO RESET
O
R
J2-1
O
R
J2-2
O
R
O
R
GPS1
GPS2
O
R
BLOWER PROVING
SWITCH (LARGE)
T
BLOWER PROVING
SWITCH (SMALL)
P
R
BLOCKED FLUE
SWITCH
B
K
BLOCKED DRAIN
SWITCH
"X5"
BLOCK WIRING
IS MODEL
DEPENDANT
Notes:
1. All wiring must be installed in accordance with: local, state, provincial and national code requirements per either N.E.C. in USA or C.S.A. in Canada.
2. If any original equipment wire as supplied with the appliance must be replaced, it must be replaced with wire having same wire gauge (AWG) and rated for a
minimum of 105° C. Exceptions: Replacement high vo ltage spark lead and ribbon cables must be purchased from the factory. Use of a non-approved spark lead
or ribbon cables can lead to operational problems which could result in non-repairable damage to the integrated controller or other components.
3. Actual connector block locations may vary from those shown on diagrams. Refer to actual components for proper connector block locations when using
diagrams to troubleshoot unit.
OPTIONAL ITEMS
INTEGRATED CONTROL
B
K
X8-20
T
X8-10
B
L
X7-8
R
X7-7
B
L
X8-13
R
X8-14
B
R
X8-12
W
X8-11
O
R
X8-5
OR/W
X8-15
P
X8-6
W
X8-16
B
L
X8-7
B
K
X8-17
Y/BK
X8-18
X8-1
-T
B
L
X8-3
-T
X8-8
/ R
W
-T
R
X8-2
-T
W
X8-4
-T
G
Y
X8-9
X1-6
X1-3
-T
X1-12
G
Y
X7-1
X10-1
X10-4
-T
B
R
X7-5
X1-1
P
R
X1-2
T
X1-4
O
R
-T
B
K
X7-2
X10-2
O
R
-T
B
L
X10-5
T
X7-6
R
X10-3
X10-6
B
L
X6-18
R
X6-8
B
K
X1-8
G
Y
R
1
X4
R
X3-3
R
X3-4
X6-9
W
O
R
X3-1
X6-17
T
O
R
X3-2
B
L
X6-1
X2-4
T
B
K
X6-11
R
2
B
R
X6-2
R
X6-14
Y
X6-10
O
R
X6-13
B
L
X6-4
R
X13-2
W
B /
K
X13-3
T
X2-3
R
X1-7
R
SPARK
GENERATOR
X1-10
R
O
R
X6-3
X1-5
P
FLUE DAMPER
TRANSFORMER
X2-5
B
K
B
R
X6-5
GPS3
X6-15
X13-4
X6-12
X13-1
X6-6
X5-1
X5-7
X5-2
X11
X5-8
X5-3
USB
INTERFACE
X5-9
X5-4
X5-10
X5-5
X5-41
X5-6
X5-12
Installation & Operation Manual
BOX DEPICTS
BOX DEPICTS
DUAL SENSOR
SINGLE HOUSING
LOW VOLTAGE
120 VAC
HIGH VOLTAGE
208V 3
1.5A EACH MAX
L1 L2 L3
N
SYSTEM PUMP
CONTACTOR
BOILER PUMP
CONTACTOR
DHW PUMP
CONTACTOR
JUNCTION
BOX
BK
R BL
ON/OFF
SWITCH
B
K
W
G
GAS VALVE
(SMALL)
GAS VALVE
(LARGE)
G
N
R
1
1
2 3
BLOWER
(SMALL)
1 2
3
4 5
R
2
R/W
1
2 3
BLOWER
(LARGE)
1 2
3
4 5
BK/W
FLAME SENSE 2
SPARK ROD
FLAME SENSE 1
GND
FLUE DAMPER
B
L
1
M
Y
2
O
R
3
24V
TRANSFORMER
BL
Y
WIRING DIAGRAM
LBL20271 REV A
63
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