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Installation & Operation Manual
12
Diagrams
(continued)
Figure 12-5 Ladder Diagram_5.0 Model
NEUTRAL
JUNCTION BOX
L1 L2 L3 TERMINAL STRIP
208V 3
BOX DEPICTS
OPTIONAL ITEMS
TERMINAL STRIP
208V SUPPLY "N"
SUPPLY
BOX DEPICTS
DUAL SENSOR
SINGLE HOUSING
INTEGRATED CONTROL
X1-3
MODBUS
BOARD
1.5A EACH MAX
ON/OFF
SWITCH
X1-12
3.15 A
5.0 A
SYSTEM PUMP
RELAY
BOILER PUMP
RELAY
SYSTEM PUMP
CONTACTOR
X1-2
INTEGRATED
CONTROL
BOLIER PUMP
CONTACTOR
X1-4
DHW PUMP
RELAY
X8-20
DHW PUMP
CONTACTOR
X1-8
X2-4
SMALL GAS
VALVE RELAY
X10-1
LOW VOLTAGE
120 VAC
HIGH VOLTAGE
X1-1
X10-2
LARGE GAS
VALVE RELAY
SMALL BLOWER
CONTACTOR
LARGE BLOWER
CONTACTOR
X10-3
LARGE GAS
VALVE RELAY
X10-6
SMALL GAS
VALVE RELAY
X10-5
GAS
VALVE
(LARGE)
X6-1
F4
X6-3
F2
GROUND
X4-1
X4-2
X4-3
X6-2
X1-6
TERMINAL STRIP
GAS
VALVE
(SMALL)
LARGE
CONNECTION BOARD
CN6-3
X8-10
CN6-2
X8-1
CN6-1
X7-8
CN3-6
X7-7
CN3-7
X8-13
CN3-14
X8-14
CN3-13
X8-12
CN3-12
X8-11
CN3-11
X8-5
CN3-10
X8-15
CN3-4 CN3-9
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
X10-4
FLAME
SENSE 2
X1-3
X8-6
X1-7
X1-10
SPARK
GENERATOR
SPARK
ROD
FLAME
SENSE 1
X2-5
CN3-8
X8-16
CN3-1
X8-7
CN3-2
X8-17
CN3-3
SHIELD
A
B
MODBUS
OPTION
SHIELD
0-10V
0-10V
+
+
-
RATE
OUT
BOILER
PUMP OUT
SYSTEM RETURN
SENSOR
SYSTEM SUPPLY
SENSOR
TANK
SENSOR
OUTDOOR
SENSOR
0-10V
+
-
BMS
IN
0-10V
+
-
SYSTEM
PUMP IN
SHIELD
A
B
CASCADE
SHIELD
X6-3
X8-18
X6-1
CN3-4
X6-10
X11
X2-5
X8-3
USB
INTERFACE
SMALL BLOWER
CONTACTOR
-T
X13-4
INLET SENSOR
X8-8
-T
OUTLET SENSOR (S9)
SMALL BLOWER
X8-2
1
2
3
-T
OUTLET SENSOR (S1)
X8-4
LARGE BLOWER
CONTACTOR
4
-T
FLUE SENSOR
LARGE BLOWER
X8-9
1
2
3
-T
FLUE SENSOR (S10)
X7-1
4
-T
PRE-MIX SENSOR 1 (S11)
X7-5
MODBUS
X1-1
-T
X1-2
PRE-MIX SENSOR 1 (S13)
X1-3
X7-2
FLUE DAMPER
TRANSFORMER
-T
PRE-MIX SENSOR 2 (S12)
X7-6
-T
PRE-MIX SENSOR 2 (S14)
FLUE DAMPER
1
M
X6-18
1
X6-9
2
X6-17
4
X6-8
5
2
SMALL BLOWER
3
24V
TRANSFORMER
1
LWCO
PROBE
LARGE BLOWER
J3-6
J3-5
X13-2
2
TEST
SWITCH
J3-3
J3-2
X13-3
4
LWCO RESET
J2-1
LWCO
BOARD
J3-4
5
X4
J2-2
RIBBON CABLE
INTEGRATED
CONTROL
CN1
CN3
LCD
DISPLAY
X6-5
GPS1
GPS2
X6-15
X6-12
BLOWER PROVING
SWITCH (SMALL)
X13-1
BLOCKED FLUE
SWITCH
X6-6
BLOCKED DRAIN
SWITCH
X3-3
CN1-4
X3-4
CN1-5
X3-1
CN1-6
X3-2
CN1-12
CN1-10
X5-1
X5-7
X6-11
CN1-11
X5-2
X6-2
CN1-9
X5-8
X6-14
CN1-8
CN1-7
X5-3
"X5"
BLOCK WIRING
IS MODEL
DEPENDANT
X5-9
X6-13
X5-4
X6-4
X5-10
DU941
SMALL
CONNECTION BOARD
GPS3
BLOWER PROVING
SWITCH (LARGE)
CN1-1
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
R
W
ENABLE
LOUVER
PROVING
24 VAC LOUVER
RELAY COIL
AUX
SWITCH 1
AUX
SWITCH 2
CN1-2
CN1-3
X5-5
X5-41
X5-6
X5-12
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.
LADDER DIAGRAM
LBL20272 REV A
62