Figure 14-2
Ladder Diagram
14
Diagrams
(continued)
79
Installation & Operation Manual
BK
BOX DEPICTS
OPTIONAL ITEMS
24 VAC
CN5-6
CN5-13
CN5-12
X4-2
X4-10
X4-11
INTEGRATED
CONTROL
CN5-4
X4-4
SPARK
CONNECTION
BOARD
INLET
SENSOR
OPERATING
FLUE
SENSOR
INTEGRATED
CONTROL
SHIELDED RIBBON CABLE
X7
13
6
2
1
SI
LE
NC
IN
G
SW
ITC
H
AL
AR
M
BE
LL
CN6
X6
CN6
X6
CN6
X6
CN6
X6
CN6
X6
CN6
X6
CN6
X6
CN5-2
X4-6
CN5-10
X4-13
CN5-1
X4-7
CN5-9
X4-14
CN6
X6
CN6
X6
CN6
X6
HIGH LIMIT
FLUE
SENSOR
X5-4
X5-12
X5-5
X5-13
X5-14
X5-6
CN6
X6
CN6
X6
CN8-1
X6-1
CN8-2
X6-2
CN8-3
X6-3
X4-1
X9-2
X4-2
X9-1
X4-3
X9-3
S2
S1a
S1b
S3a
S3b
3
4
1
2
M
O
D
B
U
S
9
CN5-14 X4-9
CN5-7
X4-1
13
CN5-11 X4-12
CN5-15 X4-8
CN5-5
X4-3
LOW VOLTAGE
120 VAC
HIGH VOLTAGE
CONNECTION BOARD
21
19
17
15
LWCO
CN7-3
CN7-2
CN7-4
CN7-1
24 VAC
HEAT/LOOP
DEMAND
HEAT/LOOP
DEMAND
3
2
1
HEAT/LOOP
DEMAND
TANK
THERMOSTAT
HIGH GAS
PRESSURE
SWITCH
LOW GAS
PRESSURE
SWITCH
RECIRC PUMP
RELAY COIL
24VAC
5
6
22
20
18
16
11
14
FLOW
SWITCH
120 VAC
120VAC
TERMINAL STRIP
120V SUPPLY "L"
ON / OFF
SWITCH
X1-6
X1-2
F2
NEUTRAL
TERMINAL STRIP
120V SUPPLY "N"
3.15A
F1
A
INTEGRATED CONTROL
GROUND
JUNCTION BOX
BOILER
PUMP
DHW
PUMP
SYSTEM
PUMP
BOILER
PUMP
CONTACTS
DHW
PUMP
CONTACTS
SYSTEM
PUMP
CONTACTS
L
IN
L
OUT
PUMP RELAYS
X1-1
1
2
BLOWER
SYSTEM PUMP
RELAY
DHW PUMP
RELAY
BOILER PUMP
RELAY
SYSTEM PUMP
RELAY
DHW PUMP
RELAY
BOILER PUMP
RELAY
24V DC
SUPPLY
F3
.8A
X5-1
X5-9
X1-3
X1-4
3
X2-1
GAS VALVE
GAS VALVE
RELAY
X5-7
X5-16
X5-8
X5-15
1
2
4
5
TR2
X1-7
FLAME ROD
ROD
CAUTION
HIGH VOLTAGE SPARK LEAD
BLOWER
X2-2
X5-2
X5-11
X5-10
AIR PRESSURE
SWITCH
BLOCKED
DRAIN SWITCH
OPTIONAL
ETHERNET CABLE
E
GND
SW1
J2
J9B
J9A
J12
J4
OPTIONAL USB/WIFI
EXTENSION CABLE
LCD
DISPLAY
24V
J3 J11
COMMUNICATION
CONTROL BOARD
WIFI
DONGLE
X1-7
OR
OR
BR
PR
OR
BR
BR
PR
PR
CN2-4
CN2-1
CN1-5
CN1-6
CN1-3
CN1-4
CN1-1
CN1-2
K1
K2
K3
ON/OFF
SWITCH
JUNCTION
BOX
BK
W
1 2 3 4 5
G
R
RW
R
T
W
BK
Y/BK
BL
BLOWER
-T
INLET SENSOR S2
FLUE SENSOR S3a
FLUE SENSOR S3b
INTEGRATED
CONTROL
BK
Y
GAS VALVE
@24VAC
SPARK
ROD
TRANSFORMER
TR2
G
HIGH VOLTAGE SPARK LEAD
CAUTION
FLAME SENSOR
P/BK
Y
W/R
X1-3
X1-4
X1-2
X1-6
X1-5
X1-8
X1-1
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
BLOCKED DRAIN SWITCH
O
CN2-2
CN2-3
DHW
PUMP
BOILER
PUMP
SYSTEM
PUMP
120VAC
SUPPLY
L
N
GND
L
IN
L
OUT
X-7
BOX DEPICTS
DUAL SENSOR
SINGLE HOUSING
MODBUS BOARD
MTR-01
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
BL
-T
-T
-T
-T
SHIELD
GROUNDING
JUMPER
O
GY
G
R/BK
W/BK
GY
PR
1 2
G
3
AIR PRESSURE SWITCH
P
O/BK
ALARM
CONTACTS
RUN-TIME
CONTACTS
24 VAC RECIRC
PUMP RELAY COIL
24 VAC LOUVER
RELAY COIL
LOUVER
PROVING SWITCH
FLOW
SWITCH
TANK
THERMOSTAT
13
14
15
16
17
18
19
20
21
22
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
1
2
3
4
5
6
7
8
9
10
35
36
37
38
39
40
41
42
43
44
45
46
CN7-1
CN7-2
CN7-3
CN7-4
CONNECTION BOARD
C
N
8-1
C
N
8-2
C
N
8-3
R
G
BE
LL
J
U
M
PE
R
AL
AR
M
B
EL
L
SI
LE
N
C
IN
G
S
W
IT
C
H
HEAT/LOOP
DEMAND
3
HEAT/LOOP
DEMAND
2
HEAT/LOOP
DEMAND
1
CN5-1
CN5-9
CN5-2
CN5-10
CN5-16
CN5-11
CN5-3
CN5-5
CN5-4
CN5-12
CN5-15
CN5-13
CN5-6
CN5-14
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
CN6
X6
CN9
BL
Y
OPTIONAL
ETHERNET CABLE
E
GND
J2
J9B
J9A
J12
J4
J8
OPTIONAL USB/WIFI
EXTENSION CABLE
LCD
DISPLAY
24V
J3 J11
COMMUNICATION
CONTROL BOARD
WIFI
DONGLE
SHIELDED CABLE
DAMPER
RELAY
FLUE DAMPER
3
2
1
M
ALARM
CONTACTS
RUN-TIME
CONTACTS
Notes:
1. All wiring must be installed 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 appliance must be replaced, then it must be replaced with wire having same wire gauge (AWG) and rated for a minumum 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 trouble shoot.
4. Where possible, switches are shown without utilities (gas, water, electricity) connected to the unit. As such, actual switch states may vary from those shown on diagrams depending upon whether utilities are connected or
fault condition is persent.
100329773 REV C
RELAY
BLOWER
RELAY
BLOWER
FAN
RELAY
PUMP RELAYS
6.3
CN5-3
X4-5
DAMPER RELAY
M
1
2
3
FLUE DAMPER
OUTLET SENSOR:
OUTLET SENSOR:
OUTLET SENSOR:
OPERATING S1a
OUTLET SENSOR:
HIGH LIMIT S1b
SYSTEM
SENSOR
OUTDOOR
SENSOR
TANK
SENSOR
CASCADE
A
B
SHIELD
SHIELD
DHW RECIRC
SENSOR
0-10V
+
-
BMS
0-10V
+
-
0-10V
+
-
0-10V
+
-
IN
A
B
SHIELD
SHIELD
SYS PUMP
IN
BLR PUMP
OUT
RATE
OUT
MODBUS
GA
23
24
25
26
27
28
29
30
31
32
33
34
S PRESSURE
SWITCH
11
12
CN5-7
LOUVER
PROVING SWITCH
9
10
LOUVER
RELAY COIL
24VAC
7
8
CN5-16
X5-3
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
CN6
X6
CN6
X6
CN6
X6
3A
SYSTEM
SENSOR
OUTDOOR
SENSOR
TANK
SENSOR
CASCADE
A
B
SHIELD
SHIELD
DHW RECIRC
SENSOR
X4-5
X4-7
X4-14
X4-6
X4-13
X4-12
X4-11
X4-4
X4-3
X4-8
X4-10
X4-2
X4-9
X4-1
3A
X5-3
12
CN6
X6
NOTES:
1. Where possible, switches are shown without utilities (gas, water or
electricity) connected to the unit. As such, actual switch states may
vary from those shown on diagrams depending upon whether utilities
are connected or a fault condition is present.
2. See wiring diagram for additional notes.
100329773 REV C
