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Ladder Diagram
HOT
FROST SENSING
3A(FUSE)
SWITCH
ARRESTER
VARISTOR
GND
PG
A
WATERFLOW
SENSOR
WATERFLOW
SENSOR
QS
CIRCUIT
A
WATERFLOW
SG
CONTROL DEVICE
WATERFLOW
M
CONTROL DEVICE
CIRCUIT
A
BY-PASSFLOW
SG
CONTROL DEVICE
BY-PASS FLOW
M
CONTROL DEVICE
CIRCUIT
SG
BY-PASS SERVO MODEL ONLY
RELAY 1
A
SV0
THERMAL FUSE
SV1
OVERHEAT
SWITCH
SV2
SV3
OUTGOING WATER
THERMISTOR
HEAT EXCHANGER
THERMISTOR
THERMISTOR
CIRCUIT
AIR TEMPERATURE
THERMISTOR
INDOOR MODEL ONLY
305, 505, 705 Indoor Manual
ANTI-FROST HEATER
VARISTOR
IGNITION
RELAY 1
IG
SWITCHING
POWER SUPPLY
DC170V
DC12V
DC40V
DC12.6V
DC5V
A
B
C
SG
B
A
MODULATING
VALVE POWER
CONTROL
CIRCUIT
SG
CPU
D
CENTRAL
PROCESSING
FAN
UNIT
CONTROL
CIRCUIT
PG
RELAY
DRIVING
CIRCUI T
A
SOLENOID
DRIVING
FLAME
CIRCUIT
DETECTING
CIRCUIT
SG
SG
B
A
REMOTE
CONTROLLER
CIRCUIT
SG
SG
SG
NEUTRAL
3A(FUSE)
E
D
B
C
MODULATING
SOLENOID
VALVE
POV
E
COMBUSTION
FAN
FAN
FLAME ROD
FR
GND
B
REMOTE
CONTROLLER
37
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