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WARNING
DO NOT adjust any dipswitch settings on PC board except dip switch number 1, if required, for vent
length or unless instructed to do so.
RELAY 1
IG
FROST SENSING
SWITCH
ANTI-FROSTHEATER
IGNITION
COMBUSTION
FAN
3A(FUSE)
HOT
NEUTRAL
VARISTOR
DC12.6V
SOLENOID
DRIVING
CIRCUIT
CPU
CENTRAL
PROCESSING
UNIT
FAN
REMOTE
CONTROLLER
POV
FAN
CONTROL
CIRCUIT
BY-PASSFLOW
CONTROL DEVI CE
CIRC UIT
THERMAL FUSE
OVER HEAT
SWITCH
MODULATING
SOLENOID
VALVE
DC40V
DC5V
A B C
SG
SWITCHING
POWERSUPPLY
THERMISTOR
CIRCUIT
B
SG
RELAY 1
A
WATER FLOW
SENSOR
CIRC UIT
WATER FL OW
CONTROL DEVI CE
CIRCUIT
A
SG
A
SG
SG
A
QS
SG
FR
FLAME
DETECTING
CIRCUIT
FLAME ROD
GND
SG
A
REMOTE
CONTROLLER
CIRCUIT
A B
E
PG
A BC
SG
SG
B
VARISTOR
ARRESTER
GND
SG
WATER FLOW
SENSOR
WATER FLOW
CONTROL DEVI CE
BY-PASSFLOW
CONTROLDEVICE
M
M
DC12V
DC170V
D
E
PG
SV3
SV2
SV1
SV0
RELAY
DRIVING
CIRCUIT
D
BY-PASS SERVOMODEL ONLY
OUTGOING WATER
THERMISTOR
HEAT EXCHANGER
THERMISTOR
AIR TEMPERATURE
THERMISTOR
INDOORMODELONLY
MODULATING
VALVE POWER
CONTROL
CIRCUIT
Figure 41. Ladder Diagram.