Crown Boiler CWI207, CWI172, CWI345, CWI310 Standing Pilot Ignition System Troubleshooting Chart

Standing Pilot Ignition System Troubleshooting Chart

START

(24 VOLTS PRESENT ACROSS TH AND TR ON GAS VALVE, BUT MAIN BURNERS DO NOT LIGHT)

Caution: Read page 36 before

attempting to use this chart

Y

Ensure knob

Main

Y

Does pilot

Y

Pilot lit?

on gas valve is

burners

END

stay lit?

set to ON

light?

N

N

N

Turn control on

*Loose

gas valve to

Turn control

thermocouple

PILOT. Depress

connection at

red button and

on gas valve

*Defective gas

gas valve.

light pilot. Hold

to ON.

valve

button for at

*Defective

least one

thermocouple.

minute.

*Condensation

Y

Disconnect

quenching pilot.

thermocouple from

*Low line

gas valve. Connect a

Does pilot

pressure.

Y

N

volt meter to the

Does pilot

stay lit when

thermocouple. Light

light?

red button is

the pilot and hold

released?

down the red button

N

while reading the

voltage across the

Line pressure

thermocouple.

within the range

N

indicated on

boiler's rating

Is voltage at

Y

plate?

least 18mV?

Y

Consult gas

supplier.

N

*Pilot tubing

blocked, kinked

or leaking

*Defective thermocouple

*Loose or defective

thermocouple

*Pilot orifice

*Pilot improperly

connection at gas valve

blocked

adjusted

*Defective gas valve

*Gas line not

*Pilot tube blocked, kinked, or

purged of air

leaking

*Pilot improperly

*Pilot orifice partially plugged

adjusted.

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