Glow-worm ASCOT 1.4S - Page 9

4.5 Slow
lgnition Device
When thc
pilot is lit and the
watcr
throttle
adjusted
to the
desired
flow ratc it
may
bc
necessary to
adjust
thc slow
ignition device.
This is
donc by
adjusting
the
screw on
thc
diaphragm housing,
sec diagram
ll. Turn IN to
dclal'
OUT
to advancc the ignition.
Check
that
after
adjustment
the
ignition is
Smooth
'
but
rr'ithout
unduc delay.
4.6 Checking the Burner Pressure
When ignition adjustrnents have
been
completcd
atnch a
pressure
gauge
to the
pressure
tcst
point
after removing the
scrcw and sealing
ring,
see
diagram
I
l.
Light thc
pilot
and
fully
opcn
the
HOT drarv-off
tap furthcst
from
thc
hcatcr.
Chcck the burncr
prcssurc
acainst the
valucs
givcn
in
Section
1.3.
4.7 Checking Summer/Winter Control
The
SummerfiVintcr
control may
be checkcd
for
correct
opcraLion
as
follorvs.
Set the control
in
the
"Winter"
position.
Incrcasc
u'atcr
fio*,
until maximum
burncr
prcssurc
is
obLaincd, 16.5mbar
(6.6in
wg)
nominal.
Gradually
reduce
watcr
flow
until
burner
pressurc
just
bcgins
to
fall,
that
is
the
prcssure
is
bctu'ccn
maximurn
and
15.Smbar
(6.3in
u,g).
Without
altering he
*'atcr
flow, tum
control [o
"Surnmcr"
position.
Thc
burncr
prcssure
should
drop
b1'
about
2.5mbar
(lin
rvg)
when
thc srvitch
is
functioning
corrcctli, and
thc
grs
inlct
prcssurc is
corrcc
t.
Rcscuing
thc control to thc
"Wintcr"
position *ill
nol
rcturn prcssurc
to thc original
valuc.
To rcpcat
thc tcsr.
sct up
as in
Scction
4.6.
Turn
ol-l' thc HOT
\\,atcr
[lrp.
Rcrnovc
prcssrlrc
girusc,
rcplacc scaling
rinq ancl
scrc\\'.
Rcfit controls
tral'.
4.8 Instruct the User
Irnportunt. Inslruct
thc uscr
in
thc corrcct
and
safc
opcration
oi thc
hcatcr.
Hlntl thc Instruct.ions
for
Usc
to
thc
uscr
for
thcir
rctcntion.
Lcavc thc
Instlllation Instructions
with
thc uscr
for
usc during [uturc scrvicc
calls.
SLOW
IGNITION
DEVICE
SETTING SCREW
PRESSURE
TEST POINT
Diagram
11
zuo{
I
o