Weil-McLain EG 6 Series Manual page 34

EG / PEG 6
sEriEs
Troubleshooting – (EG water boilers)
– Spark-ignited pilot – FLAME light flashing and POWER light on steady
CHART 5
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 manual main shutoff valve and gas valve open?
No
to boiler at service switch or breaker.
• ▲ TURN OFF POWER ▲
• Open main manual shutoff valve and boiler gas valve (per
Operating instructions in this manual). Wait at least 45
seconds.
• Turn on power at service switch or breaker. Allow boiler to cycle .
Does FLAME light flash now?
No
• Boiler should be in • Verify inlet gas pressure at gas
normal operating
sequence.
• Observe operation
until thermostat is
satisfied and blower
has completed its
post-purge cycle.
to
• ▲ TURN OFF POWER ▲
boiler at service switch or
breaker.
• Remove base access panel.
• Verify pilot gas line is
not kinked, obstructed or
damaged and is correctly at-
tached to pilot and gas valve.
• Verify pilot ignition electrode,
electrode ceramic and spark
lead wire from control are in
good condition. Spark gap
should be approximately 1/8".
• Correct any above problems,
replacing pilot if burner or
wiring is damaged.
• Reinstall base access panel to
operate boiler for retest after
any changes or corrections.
• If none of the above corrects
problems, then replace the
control module, reinstall base
access panel, and retest.
34
EGH 5
•
sEriEs Gas
ALSO –– Troubleshooting failure to establish main flame
Yes
Yes
valve:
Natural gas – 5.0" w.c. min./14.0"
w.c. max
Propane – 11.0" w.c. min./14.0"
w.c. max
Is gas present at gas valve inlet and
within above range?
Yes No
• Contact gas supplier to correct
pressure or gas supply.
• ▲ TURN OFF POWER ▲
boiler at service switch or
breaker.
• Remove base access panel.
• Verify pilot burner is securely
attached to pilot bracket, bracket
is securely attached to cross-tie,
and there is no corrosion on the
ground path for flame sense.
• Verify that pilot flame rod, flame
rod ceramic and lead wire from
control module to flame rod are in
good condition.
• Correct any above problems,
replacing pilot if burner or wiring
is damaged.
- — C
firEd boilErs
• Is pilot flame visible through inspection ?
No
• Check the voltage across
main gas valve terminals
of the gas valve.
Is 24VAC present there?
Yes
• If the wiring from the
control module to gas valve
is intact, replace the control
module.
• Retest.
• Verify inlet gas pressure at gas valve:
Natural gas – 5.0" w.c. min/14.0" w.c. max.
Propane – 11.0" w.c. min./14.0" w.c. max.
Is gas present at gas valve inlet and within above range?
No
• ▲ TURN OFF POWER ▲
• Check flame signal – Detach lead from ignition control
(Figure 15, Item 8, page 29).
to
• Connect negative lead of MICROAMMETER to control sense
terminal (Figure 15, Item 8, page 29). Connect positive
lead of MICROAMMETER to sense wire.
• DISCONNECT red wire connected to main gas valve terminal
of the gas valve.
• Turn on power to boiler and allow to cycle. As soon as pilot
is burning, the MICROAMMETER should read at least 1.0
microamp.
Is flame signal at least 1.0 microamp ?
No
• If, none of the previous steps
(including replacing pilot)
corrects problem, then replace
the control module, reinstall
base access panel and retest.
s
ontrol uPPlEmEnt
continued
Yes
• Make sure ground wire
terminal is securely fastened
to control module mounting
screw.
No
• Check the voltage across
main gas valve terminals
of the gas valve.
Is 24VAC present there?
No
Yes
to boiler at service switch or breaker.
Yes
• If the wiring from the
control module to gas valve
is intact, replace the control
module and retest.
Part Number 550-142-304/1220
Yes