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EX17DT and EX22DT Installation and Operation Manual 53
9.3 Ladder Diagram
Mark Parts Name
MS Main Switch
R.TH Room Thermistor
TF Thermal Fuse
F Fuse
ER Electrode
POV Modulating Solenoid Valve
FR Flame Rod
CF Convection Fan
FM Convection Fan Motor
SP Sparker
Mark Parts Name
OHS Over Heat Switch
OH.TH1,2 Over Heater Thermistor 1,2
SV1,2 Solenoid Valve 1,2
MAIN CPU Central Processing Unit
SUB CPU Central Processing Unit for Safety
MB Main Burner
PS Pressure Sensor
W.TH Wall Thermostat
BL Combustion Fan Motor
FCC Fan Control Circuit
Figure 61: Ladder Diagram
A: DC5V
B: DC12V
C: DC15V
D: DC24V
E: DC170V
F: AC24V
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