Filter
Top Products
55
X1-7
ON/OFF
SWITCH
1 2 3 4
5
G
R
R
W
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 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 re
sult in non-repairable damage to the integrated controller or o
ther components.
3. Actual connector block locations may vary from those shown on
diagrams. Refer to actual components for proper connector blo
ck locations when using
diagrams to troubleshoot unit.
WIRING DIAGRAM
LBL20127 REV E
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
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
3
HEAT/LOOP
DEMAND
2
HEAT/LOOP
DEMAND
1
CN6
Figure 10-2 Wiring Diagram
10 Diagrams (continued)
Outdoor Knight Boiler Installation & Operation Manual