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