Weil-McLain CGA25SPDN manual Item 8

GOLD CGa Gas-Fired Water Boiler — Boiler Manual

11c Troubleshooting — spark-pilot boilers (continued)

CHART 6 — Spark-ignited pilot — FLAME light flashing and POWER light on steady ALSO — Troubleshooting failure to establish main flame

Electrical shock hazard — Wherever you see TURN OFF POWER

, follow the instructions. Failure to follow

instructions could result in severe personal injury, death or substantial property damage.

• Are main manual shutoff valve and boiler gas valve open?

•

Is pilot flame visible through inspection port?

No

Yes

No

Yes

• sTURN OFF POWERs to boiler at service switch or breaker.

• Open main manual shutoff valve and boiler gas valve (per

•

Check the voltage across

•

Make sure ground wire

Operating instructions in this manual). Wait at least 45

main gas valve terminals of

terminal is securely fastened

seconds.

the gas valve.

to control module mounting

• Turn on power at service switch or breaker. Allow boiler to cycle.

Is 24 VAC present there?

screw.

Does FLAME light flash now?

Yes

No

No

Yes

• Boiler should be in

•

Verify inlet gas pressure at gas

•

If the wiring from the

•

Check the voltage across

valve:

control module to gas

main gas valve terminals of

normal operating

Natural gas — 5.0" w.c. min/14.0"

valve is intact, replace the

the gas valve.

sequence.

w.c. max

control module.

Is 24 VAC present there?

•

Observe operation

•

Retest.

Propane — 11.0" w.c. min/14.0"

No

Yes

until thermostat is

w.c. max

satisfied and blower

Is gas present at gas valve inlet and

has completed its

post-purge cycle.

within above range?

• Verify inlet gas pressure at gas valve:

Yes

No

Natural gas — 5.0" w.c. min/14.0" w.c. max

Propane — 11.0" w.c. min/14.0" w.c. max

•

TURN OFF POWER

to

Is gas present at gas valve inlet and within above range?

boiler at service switch or

• Contact gas supplier to correct

breaker.

No

Yes

pressure or gas supply.

• Remove base access panel

(see Figure 32, item 4,

page 62 for location).

•

TURN OFF POWER to

•

TURN OFF POWER to boiler at service switch or breaker.

boiler at service switch or

•

Check flame signal — Detach sense lead from igntion control

• Verify pilot gas line is not

breaker.

kinked, obstructed or damaged

•

Remove base access panel (see

(Figure 30, item 8, page 53).

and is correctly attached to

Figure 32, item 4, page 62 for

•

Connect negative lead of MICROAMMETER to control sense

pilot and gas valve.

location).

terminal (Figure 30, item 8, page 53). Connect positive lead of

• Verify pilot ignition electrode,

MICROAMMETER to sense wire.

electrode ceramic and spark

• Verify pilot burner is securely

•

DISCONNECT red wire connected to man gas valve terminal of

lead wire from control are in

attached to pilot bracket, bracket

the gas valve.

good condition. Spark gap

is securely attached to cross tie,

•

Turn on power to boiler and allow to cycle. As soon as pilot is

should be approximately 1/8".

and there is no corrosion on the

burning, the MICROAMMETER should read at least 1.0

• Correct any above problems,

parts which would affect the

microamp.

replacing pilot if burner or

ground path for flame sense.

Is flame signal at least 1.0 microamp?

wiring is damaged.

• Verify that pilot flame rod, flame

No

Yes

• Reinstall base access panel to

rod ceramic and lead wire from

operate boiler for retest after

control module to flame rod are in

any changes or corrections.

good condition.

•

If none of the previous steps

• If the wiring from the

• If none of the above corrects

• Correct any above problems,

(including replacing pilot)

control module to gas

problem, then replace the

replacing pilot if burner or wiring

corrects problem, then replace

valve is intact, replace the

control module, reinstall base

is damaged.

the control module, reinstall

control module and retest.

access panel, and retest.

base access panel and retest.

58

Part Number 550-101-009/0107