66
12
Diagram
JUNCTION BOX
TERMINAL STRIP
208V 3
O
SUPPLY
TERMINAL STRIP
208V SUPPLY "N"
NEUTRAL
INTEGRATED CONTROL
ON/OFF
SWITCH
F2
3.15 A
F4
5.0 A
SYSTEM PUMP
RELAY
BOILER PUMP
RELAY
DHW PUMP
RELAY
X1-1
X1-2
X1-4
X1-8
BLOWER
CONTACTOR
GAS
VALVE RELAY
X1-6
X10-1
X10-2
GAS
VALVE RELAY
X10-5
X10-4
GAS
VALVE
TERMINAL STRIP
SYSTEM PUMP
CONTACTOR
BOLIER PUMP
CONTACTOR
DHW PUMP
CONTACTOR
BLOWER
CONTACTOR
BLOWER
X6-10
X6-1
4
BAS
2
-
1
X
1
-
1
X
X1-3
24V
TRANSFORMER
X6-3
X1-12
X1-3
LWCO
BOARD
TEST
SWITCH
LWCO
PROBE
LWCO RESET
J3-6
J3-3
J2-1
J2-2
J3-5
J3-2
J3-4
X6-5
X6-12
X13-1
X6-6
X3-3
X3-4
X3-1
X3-2
X6-11
X6-2
X6-14
INTEGRATED
CONTROL
GPS1
GPS2
AIR PRESSURE
SWITCH
BLOCKED FLUE
SWITCH
BLOCKED DRAIN
SWITCH
SMALL
CONNECTION BOARD
X6-13
X1-5
X1-7
X1-10
FLAME
SENSE 1
SPARK
GENERATOR
SPARK
ROD
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
SHIELD
SHIELD
A
B
BAS
OPTION
+
-
RATE
OUT
SYSTEM RETURN
SENSOR
SYSTEM SUPPLY
SENSOR
0-10V
TANK
SENSOR
OUTDOOR
SENSOR
+
+
-
-
0-10V
0-10V
BMS
IN
SYSTEM
PUMP IN
SHIELD
SHIELD
A
B
CASCADE
LARGE
CONNECTION BOARD
CN6-1
CN3-6
CN3-14
CN3-13
CN3-11
CN3-9
CN3-8
CN3-1
CN3-2
CN3-3
CN3-4
CN6-2
CN6-3
CN3-10
CN3-12
BAS
BOARD
X4-1
X4-2
X4-3
X6-
3
X6-1
X6-2
X8-20
X8-10
X7-8
X8-13
X8-14
X8-12
INTEGRATED
CONTROL
X8-5
X8-15
X8-11
X8-6
X8-16
X8-7
X8-17
X8-18
-T
-T
-T
-T
INLET SENSOR
OUTLET SENSOR (S9)
OUTLET SENSOR (S1)
FLUE SENSOR
X8-3
X8-8
X8-2
X8-4
GROUND
X6-18
X6-9
X6-17
X6-8
1
5
SMALL BLOWER
1.5A EACH MAX
X11
X4
X5-1
X5-7
X5-2
X5-8
X5-3
X5-9
X5-4
X5-10
X5-5
X5-41
X5-6
X5-12
BOX DEPICTS
OPTIONAL ITEMS
BOX DEPICTS
DUAL SENSOR
SINGLE HOUSING
HIGH VOLTAGE
LOW VOLTAGE
120 VAC
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.
USB
INTERFACE
"X5"
BLOCK WIRING
IS MODEL
DEPENDANT
L1 L2 L3
1
2
3
LADDER DIAGRAM
100273959 REV A
X8-1
CN3-4
OPTIONAL
ETHERNET CABLE
1
4
2
5
SMALL BLOWER
E
GND
WIFI
DONGLE
SW1
J2
8
43
J6
J9
J17
J23
J12
J11
LG CON BRD
J8
LCD
DISPLAY
USB CABLE
LCD
DISPLAY
J10
J7
BAS
CN6-1
CN6-3
24V
CN6-2
OPTIONAL USB/WIFI
EXTENSION CABLE
LCD
DISPLAY
X6-4
HIGH LIMIT
SWITCH
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
ALARM
CONTACTS
RUN-TIME
CONTACTS
TANK
THERMOSTAT
LOUVER
PROVING
24 VAC LOUVER
RELAY COIL
ENABLE
R
W
CN1-4
CN1-5
CN1-6
CN1-12
CN1-10
CN1-11
CN1-9
CN1-8
CN1-7
CN1-1
CN1-2
Notes:
3 WAY
VALVE
GROUND
OPEN SWITCH 1
CLOSE SWITCH
24 VAC
X6-7
X6-16
CN1-3
Installation & Operation Manual
Figure 12-5 Ladder Diagram_3.5 & 4.0 Models