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17
LINE
K1
COMB
BLOWER
K5
IGNITER
ELEMENT
24
VAC
ECO/VENT
SWITCH
SWITCH
PRESSURE
GAS
VALVE
RLY 1
GAS
VALVE
RLY 2
GAS
VALVE
CONTROL
HEALTH
WATER
TEMPERATURE
K1
K5
K3
K4
K4K3
CONTROL
ELECTRONICS
LINE
K1
COMB
BLOWER
K5
IGNITER
ELEMENT
24
VAC
ECO/VENT
SWITCH
SWITCH
PRESSURE
GAS
VALVE
RLY 1
GAS
VALVE
RLY 2
GAS
VALVE
CONTROL
HEALTH
WATER
TEMPERATURE
K1
K5
K3
K4
K4K3
CONTROL
ELECTRONICS
LINE
K1
COMB
BLOWER
K5
IGNITER
ELEMENT
24
VAC
ECO/VENT
SWITCH
SWITCH
PRESSURE
GAS
VALVE
RLY 1
GAS
VALVE
RLY 2
GAS
VALVE
CONTROL
HEALTH
WATER
TEMPERATURE
K1
K5
K3
K4
K4K3
CONTROL
ELECTRONICS
LINE
K1
COMB
BLOWER
K5
IGNITER
ELEMENT
24
VAC
ECO/VENT
SWITCH
SWITCH
PRESSURE
GAS
VALVE
RLY 1
GAS
VALVE
RLY 2
GAS
VALVE
CONTROL
HEALTH
WATER
TEMPERATURE
K1
K5
K3
K4
K4K3
CONTROL
ELECTRONICS
LINE
K1
COMB
BLOWER
K5
IGNITER
ELEMENT
24
VAC
ECO/VENT
SWITCH
SWITCH
PRESSURE
GAS
VALVE
RLY 1
GAS
VALVE
RLY 2
GAS
VALVE
CONTROL
HEALTH
WATER
TEMPERATURE
K1
K5
K3
K4
K4K3
CONTROL
ELECTRONICS
LINE
K1
COMB
BLOWER
K5
IGNITER
ELEMENT
24
VAC
ECO/VENT
SWITCH
SWITCH
PRESSURE
GAS
VALVE
RLY 1
GAS
VALVE
RLY 2
GAS
VALVE
CONTROL
HEALTH
WATER
TEMPERATURE
K1
K5
K3
K4
K4K3
CONTROL
ELECTRONICS
STATUS INDICATIONS UNDER NORMAL OPERATING CONDITIONS
4. Pressure Switch Closes,
Pre-purge Cycle Starts
5. Igniter Element Warmup
6. Burner Light-off
7. Water Heating
8. End Call for Heat
Start Post-purge Cycle
9. End of Sequence, Idle State