TERMINAL STRIP
TERMINAL STRIP
16
15
13
12
11
10
9
6
5
3
2
1
39
36
35
33
32
31
30
29
26
25
23
22
21
20
19
OUTLET SENSOR (S9)
OUTLET SENSOR (S1)
FLUE SENSOR
FLUE SENSOR (S10)
120VAC
NEUTRAL
ON/OFF
SWITCH
GAS
VALVE
(LARGE)
GAS
VALVE
(SMALL)
CONTACTOR
BOILER PUMP
CONTACTOR
DHW PUMP
CONTACTOR
BLOWER
BLOWER
1
2
3
BAS (AS APPLICABLE)
FLUE DAMPER
TRANSFORMER
1
2
3
TRANSFORMER
FLUE DAMPER
TEST
SWITCH
LWCO
PROBE
LWCO RESET
GPS1 GPS2
BLOCKED FLUE
SWITCH
BLOCKED DRAIN
SWITCH
ALARM
CONTACTS
CONTACTS
TANK
THERMOSTAT
LOUVER
PROVING
AUX
SWITCH 1
AUX
SWITCH 2
ENABLE
R
W
FLAME
SENSE 1
FLAME
SENSE 2
SPARK
GENERATOR
SPARK
ROD
SHIELD
SHIELD
A
B
BAS
OPTION
RATE
OUT
BOILER
PUMP OUT
SENSOR
SENSOR
TANK
SENSOR
OUTDOOR
SENSOR
BMS
IN
PUMP IN
SHIELD
SHIELD
A
B
CASCADE
INLET SENSOR
GROUND
1
2
5
BLOWER
BOX DEPICTS
OPTIONAL ITEMS
BOX DEPICTS
DUAL SENSOR
SINGLE HOUSING
HIGH VOLTAGE
LOW VOLTAGE
120 VAC
"X5"
BLOCK WIRING
IS MODEL
DEPENDENT
AIR VALVE
PRESS. SWITCH
BLOWER
AIR VALVE
HIGH LIMIT
SWITCH
M
M
DISCONNECT POWER
BEFORE SERVICING
BOILER PUMP
DHW PUMP
5.0 A
3.15 A
F2
LARGE GAS
LARGE GAS
SMALL GAS
SMALL GAS
USB
INTERFACE
X11
WIFI
DONGLE
USB CABLE
SW1
LG CON BRD
OPTIONAL
ETHERNET CABLE
OPTIONAL USB/WIFI
EXTENSION CABLE
BAS
E
GND
BAS
BOARD
(AS
APPLICABLE)
SHIELDED CABLE FROM X4
TO J12 OR J23 AS APPLICABLE
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
shielded
cables
must be purchased from the factory. Use of a non-approved spark lead or
shielded
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.
LADDER DIAGRAM
100266646 REV B
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