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Installation & Operation Manual
78
X1-7
ON/OFF
SWITCH
1 2
3 4
5
G
R
RW
R
T
W
BK
Y
BL
BLOWER
-T
HIGH LIMIT SENSOR S1b
OPERATING SENSOR S1a
INLET SENSOR S2
FLUE SENSOR S3a
FLUE SENSOR S3b
INTEGRATED
CONTROL
BK
Y
GAS VALVE
@24VAC
SPARK
ROD
TRANSFORMER
TR2
G
HIGH VOLTAGE SPARK LEADCAUTION
FLAME SENSOR
ALARM
CONTACTS
RUN-TIME
CONTACTS
24 VAC LOUVER
RELAY COIL
LOUVER
PROVING SWITCH
GAS PRESSURE
SWITCH
FLOW
SWITCH
TANK
THERMOSTAT
11
12
13
14
15
16
17
18
19
20
SYSTEM
SENSOR
OUTDOOR
SENSOR
TANK
SENSOR
CASCADE
A
B
SHIELD
SHIELD
0-10V
+
-
BMS
IN
0-10V
+
-
SYS PUMP
IN
0-10V
+
-
BLR PUMP
OUT
0-10V
+
-
RATE
OUT
MODBUS
OPTION
A
B
SHIELD
SHIELD
LOW
WATER
CUT-OFF
24 VAC
COM
P/BK
Y
W/R
1
2
3
4
5
6
7
8
9
10
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
CN7-1
CN7-2
CN7-3
CN7-4
CN5-1
CN5-8
CN5-2
CN5-9
CN5-3
CN5-10
CN5-11
CN5-4
CN5-5
CN5-14
CN5-12
CN5-6
CN5-13
CN5-7
X5-7
X5-16
X5-8
X5-15
X5-9
X5-1
X5-2
X5-10
X5-11
X5-4
X5-12
X5-6
X5-5
X5-13
X5-14
X2-2
X2-1
BK
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 purchase
d from the factory. Use of a non-approved spark le
ad
or ribbon cables can lead to operational problems w
hich could result in non-repairable damage to the integrated controller or other components.
3. Actual connector block locations may vary from t
hose shown on diagrams. Refer to actual components
for proper connector block locations when using
diagrams to troubleshoot unit.
WIRING DIAGRAM
LBL20127 REV C
BOX DEPICTS
OPTIONAL ITEMS
X4-7
X4-14
X4-6
X4-13
X4-5
X4-12
X4-11
X4-4
X4-3
X4-8
X4-10
X4-2
X4-9
X4-1
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
CONNECTION BOARD
CN6
X6
HIGH VOLTAGE
LOW VOLTAGE
120 VAC
X-7
BOX DEPICTS
DUAL SENSOR
SINGLE HOUSING
MODBUS BOARD
MTR-01
CN8-1
CN8-2
CN8-3
X6-3
X6-2
X6-1
X6-4
X9-1
X9-2
X9-3
X9-4
X4-1
X4-2
X4-3
X4-4
X5-1
X5-2
X1-1
X1-2
X1-3
BK
W
G
R
BL
G
-T
-T
-T
-T
SHIELD
GROUNDING
JUMPER
O
GY
G
R/BK
W/BK
GY
PR
1
2
G
3
BELL JUMPER
ALARM BELL
SILENCING SWITCH
JUNCTION
BOX
DHW
PUMP
BOILER
PUMP
SYSTEM
PUMP
BOX DEPICTS
OPTIONAL
ITEMS
G
G
G
L
GND
N
120V
SUPPLY
X1-3
X1-4
X1-2
X1-5
X1-6
X1-8
X1-1
BK
OR
W
W
W
BR
PR
W
L
N
L
N
L
N
L
N
KB ONLY
O-TEMP HEX SW
BLOCKED DRAIN SWITCH
O
AIR PRESSURE SWITCH
P
O/BK
KB 286 ONLY
HEAT/LOOP
DEMAND
1
HEAT/LOOP
DEMAND
2
HEAT/LOOP
DEMAND
3
Figure 13-2 Wiring Diagram
13 Diagrams