7
Diagrams
(continued)
Figure 7-2 Wiring Diagram
23
ModBus Instructions
-T
-T
-T
-T
-T
-T
-T
-T
-T
1
3
2
1 2
4 5
3
1
3
2
1 2
4 5
3
M
1
2
3
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 voltage 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.
WIRING DIAGRAM
LBL20181 REV A
BOX DEPICTS
OPTIONAL ITEMS
BOX DEPICTS
DUAL SENSOR
SINGLE HOUSING
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CN1-12
CN1-5
CN1-10
CN1-11
CN1-6
CN1-9
CN1-8
CN1-7
CN1-1
CN1-2
CN1-3
CN1-4
17
CN3-6
CN6-2
CN3-7
CN3-14
CN6-1
CN3-13
CN3-12
CN3-11
CN3-10
CN3-9
CN3-8
CN6-3
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
CN3-1
CN3-2
CN3-4
CN3-3
X3-2
X3-4
X6-1
X6-11
X3-1
X6-2
X6-14
X6-10
X6-13
X6-4
X3-3
X7-8
X7-7
X8-14
X8-13
X8-12
X8-11
X8-15
X8-5
X8-6
X8-16
X8-7
X8-17
X8-18
X8-1
ALARM
CONTACTS
RUN-TIME
CONTACTS
TANK
THERMOSTAT
LOUVER
PROVING
24 VAC LOUVER
RELAY COIL
AUX
SWITCH 1
AUX
SWITCH 2
SHIELD
SHIELD
A
B
MODBUS
OPTION
+
-
-
+
RATE
OUT
BOILER
PUMP OUT
SYSTEM RETURN
SENSOR
SYSTEM SUPPLY
SENSOR
0-10V
0-10V
TANK
SENSOR
OUTDOOR
SENSOR
+
+
-
-
0-10V
0-10V
BMS
IN
SYSTEM
PUMP IN
SHIELD
SHIELD
A
B
CASCADE
R
R
OR
OR
BL
BK
BR
R
Y
OR
HIGH LIMIT
SWITCH
R
R
X6-1
X6-2
X6-3
GY
R
PR
MODBUS
BOARD
BL
R
BL
R
BR
W
OR
OR/W
P
W
BL
BK
Y
J3-5
J3-4
J3-6
LWCO
BOARD
J3-3
J3-2
J2-1
J2-2
X6-3
OR
OR/BK
OR/BK
TEST
SWITCH
LWCO
PROBE
OR
OR
LWCO RESET
X6-5
GPS1
GPS2
GPS3
BR
OR
OR
X6-15
BLOWER PROVING
SWITCH (LARGE)
OR
X6-12
BLOWER PROVING
SWITCH (SMALL)
T
X13-1
BLOCKED FLUE
SWITCH
PR
X6-6
BLOCKED DRAIN
SWITCH
BK
ENABLE
X8-3
X8-8
X8-2
X8-4
X8-9
X7-1
X7-5
X7-2
X7-6
INLET SENSOR
OUTLET SENSOR (S9)
OUTLET SENSOR (S1)
FLUE SENSOR
FLUE SENSOR (S10)
PRE-MIX SENSOR 1 (S11)
PRE-MIX SENSOR 1 (S13)
PRE-MIX SENSOR 2 (S12)
PRE-MIX SENSOR 2 (S14)
R
W
X4-1
X4-2
X4-3
X8-20
X8-10
X5-8
X5-7
X5-3
X5-9
X5-2
X5-4
X5-10
X5-5
X5-41
X5-6
X5-12
X5-1
"X5"
BLOCK WIRING
IS MODEL
DEPENDANT
BK
T
BL
R/W
R
W
GY
GY
BR
T
X10-1
X1-3
X10-4
X1-1
X1-12
X1-2
X1-4
X10-2
X10-5
X10-3
X10-6
X1-6
L
N
GND
120V
SUPPLY
ON/OFF
SWITCH
GND
GAS VALVE
(SMALL)
GAS VALVE
(LARGE)
BK
W
PR
T
OR
OR
BL
R
BL
X6-18
X6-8
X1-8
G
X6-9
X6-17
SMALL
BLOWER
RELAY
LARGE
BLOWER
RELAY
X2-4
X13-2
X13-3
BLOWER
(SMALL)
BLOWER
(LARGE)
R
BK
GY
W
T
T
W/BK
T
BK
BK/W
G/W
R/W
BK/W
X2-3
X1-7
X1-10
X1-5
FLAME SENSE 2
FLAME SENSE 1
SPARK
GENERATOR
SPARK ROD
X2-5
FLUE DAMPER
TRANSFORMER
X13-4
FLUE DAMPER
24V
TRANSFORMER
BL
R
R
R
P
BK
BL
Y
OR
BL
Y
BK
X1-2
X1-3
X1-1
INTEGRATED CONTROL
LARGE CONNECTION BOARD
SMALL CONNECTION BOARD
JUNCTION
BOX
X11
X4
CN3
CN1
DU941
USB
INTERFACE
LCD
DISPLAY
BOILER PUMP
CONTACTOR
SYSTEM PUMP
CONTACTOR
DHW PUMP
CONTACTOR
BK
HIGH VOLTAGE
LOW VOLTAGE
120 VAC
1.5A EACH MAX