Glow-worm ASCOT 1.4S - Page 17

Water filter
blocked.
Venturi
or
high
and
Slou, ignition
valve
Diaphragm damaged.
Valve
spindle sticking.
Throttle inconectly
set.
Main
gasways
or injector
blocked.
7.4 Slow
lgnition
of Main Burner
or
CAUSE
Reduced
gas pressure
at
burner:
sr.iff.
low
pressure
tubes
blocked.
--
not
adiusted correctlv
or blocked.
-
Low
Clean or
change
watcr filtcr.
Check that.
venturi
and
pressure tubes are clear.
Readjust
or clean
as
necessary.
Inspect
and
renew diaphragm
if
necessary.
Check
valve
spindle
is
undamaged,
lubricate
or
renew as necessary.
Check throttle,
resel as
necessary.
Inspect
and
clear any
obsuuction.
Outlet Temperature.
REMEDY
(a)
Gas service
cock
not
fully
open.
(b)
Obstruction
in main
gas \\,ays.
(c)
Reduced inlet
pressure
Insufficient water
flow
(a)
\\/arer
service cock not.
to fully
open
gas valve.
fulli'open
(b)
\\/ater filter
blocked.
(c)
Insufficient pressure
from u,arer
(d)
Heat
exchanger fouled
by
scale.
supply.
Excessive waler
flow
throueh heater.
SIo*, isnition
valve
incorrectly
sct.
_
Diaphragm
defective.
Automaric
gas
spindle
7.5 Main
Burner
Remains
Alight
after Tap is
CAUSE
Automatic
gas
valvc
hcld
opcn by foreign
body.
Diaphraurn
defcctive.
Automatic gas
valvc
spindlc
stiff.
Turn
gas
cock
fully
on.
Inspect for and clear any
obstruction.
Ensure
that
gas
supply
is clear of
any
obstructions
and that
it
is adequate
for the
heater
when
other
gas
appliances
are in
use.
Turn
water
cock fully
on.
Clean
u'ater
filter or
rene\\' as necessary.
See Section7.3.
Descale
or
replace heal exchanger.
Check
waler
flow
rate
through
the
heater.
Reset throttle heater
as necessary,
if
stiff,
examinc throttlc
lor
obstruction.
Clean
and adjust slow
ignition
valvc.
Examine and rcncw diaphragm
as
nccessary.
Examine
spindle,
rcnov
if nccessary.
Lubricate spindlc.
turned
off.
REMEDY
Aul.omatic
Low
and
Ball
sruck
Dcad
lcg
Automa[ic
gas
valvc
spring
u,cak
or damagcd.
high
prcssurc
tubcs blockcd.
in
slow
ignition valvc.
in
wirtcr
supply crcating
an air
lock.
Clcan
gas valvc
scat, chcc:k
nutin
gls l'iltcr.
BIow out
fccd tubcs.
Examinc and rcplircc ils
ncccssilry.
Examinc
spindlc, rcnov
il-
ncccssllr)'.
Lubricatc spintllc.
Rcncw spring.
Rcmovc and blow
through.
Clcln
or
rcncrv
ball.
Rcrnovc dcad
lcg.
In.spcct.
scal
antl rcncrv il'
ncccssary.
gas
valvc
scll
damagcd
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