31
11.7
LADDER DIAGRAM
S3
S1
S2
S5
S4
S6
CN2-9
CN2-8
CN2-7
INTERFACE
PC
CN2-5
CN2-6
CN2-7
CN2-8
CN1-12
CN1-11
CN1-10
CN1-9
CN1-8
CN1-7
CN1-6
CN1-5
CN1-4
CN1-3
CN1-2
X4-2
CN3-2
CN1-1
CONTROL
EXTERNAL
SHIELD
SHIELD
B
A
RS485
-
+
0-10V
SENSOR
OUTDOOR
SENSOR
AUXILIARY
SENSOR
SYSTEM
X8
X4-5
CN3-5
RIBBON CABLE
X3
X5-9
X5-2
X5-1
X5-8
X3-2
X3-4
X3-3
X3-1
CONTACTS
RUN-TIME
CONTACTS
ALARM
CN4-4
CN4-10
CN4-12
CN4-11
CONTROL
INTEGRATED
X4-10
X4-1
X4-3
X4-4
X4-6
X4-9
X4-7
X4-8
SENSOR
FLUE
SENSOR
OUTLET
SENSOR
INLET
CONNECTION BOARD
DISPLAY
CN3-10
CN3-1
CN3-3
CN3-4
CN3-6
CN3-9
CN3-7
CN3-8
2. See wiring diagram for additional notes.
are connected or a fault condition is present.
vary from those shown on diagrams depending upon whether utilities
electricity) connected to the unit. As such, actual switch states may
1. Where possible, switches are shown without utilities (gas, water or
NOTES:
CN4-14
X6-2
GND
GND
GND
X2-2
CN2-4
CN2-13
CN2-14
CN2-15
CN2-16
CN2-11
CN2-3
CN2-1
CN2-12
CN2-10
CN2-2
CN2-9
STRIP
TERMINAL
STRIP
TERMINAL
FAN
HIGH VOLTAGE SPARK LEAD
CAUTION
HIGH VOLTAGE
LOW VOLTAGE
230 VAC
CONTROL
INTEGRATED
JUNCTION BOX
GROUND
INTEGRATED CONTROL
ROD
SPARK
FLAME ROD
X1-7
TR1
1.25A
F3
3.5A
F2
3.5A
F4
5A
5
4
2
1
X5-12
X5-6
X5-13
X5-5
RELAY
GAS VALVE
GAS VALVE
X2-1
X5-4
X5-10
X5-3
X5-11
HI-LIMIT
AUTO RESET
SWITCH
DRAIN
BLOCKED
X6-10
CN4-2
PROVING
AUX. DEVICE
24VAC
PILOT SUPPLY
AUX. DEVICE
SWITCH
PRESSURE
HIGH GAS
SWITCH
PRESSURE
LOW GAS
BOARD
CONNECTION
X6-4
CN4-9
X5-14
HIGH LIMIT
MANUAL RESET
CONTROL
INTEGRATED
X6-5
X6-1
X6-6
X6-9
CN4-3
CN4-5
CN4-13
CN4-6
BOARD
CONNECTION
BOARD
CONNECTION
THERMOSTAT
DHW
ZONE CONTROL
ROOM THERMOSTAT
CN5-4
CN5-2
LWCO
CN5-3
BOARD
CONNECTION
SWITCH
FLOW
X1-8
BOX
JUNCTION
230V SUPPLY "N"
TERMINAL STRIP
CN5-1
CN4-7
BOARD
CONNECTION
CN4-1
CN4-8
NEUTRAL
X6-7
X5-7
F5
X6-3
X6-8
X1-5
JUNCTION BOX
FAN
3
2
1
PUMP "N"
SECONDARY
PUMP "N"
DHW
PUMP "N"
PRIMARY
PUMP
SECONDARY
PUMP
DHW
PUMP
PRIMARY
PUMP "L"
SECONDARY
PUMP "L"
DHW
PUMP "L"
PRIMARY
X1-1
X1-2
X1-3
X1-4
RELAY
PUMP RELAY
SECONDARY
RELAY
DHW PUMP
RELAY
PRIMARY PUMP
X1-6
SWITCH
ON / OFF
230V SUPPLY "L"
TERMINAL STRIP
230VAC
24 VAC
230 VAC
OPTIONAL ITEMS
BOX DEPICTS
FAN
FIGURE 11.5
LADDER DIAGRAM
