Fig.
30.
Gas control valve.
Ga
s
service
tap
Fig. 31
Governor
ad
j
us
te
r
under
plastic
c
ap
.
Gas
man
i
fold
to
bu
rner.
Burner
sett
i
ng
pressu
re
test
point.
Pressure
ad
j
us
tm
ent
12
. Position the Users Operating
Sw
itch to HEATING
AND
WATER or,
if
a programmer is fitted, f8posit4on
th
e
cent
ra
l
heating
se
lector
switc
h
to
24hrs
. Check
th
at
aU
theradiator
va~ve
s
are
fu
lly open and t
he
boiler temperature co
nt
rol is
at maximum.
The
boiler will modulate at the dictates
of
the
c
ent
ral heating sensor i
nit
ially operating at
an
output
of 8. 8
kW
(30
,
000
Btu/h). see
Tab
le 1
for
the equivalent burner
pr
essure. The o
ut
put
wil
l
inc
rease up t o the
fac
tory set
output
of
15
kW
151,200
Btu
/h), see Table 1
fo
r the
equ
i
va
lo
nt
bur
ner
pressure
. Balance the
system
as
described
in Section 9,
instruction
4.
1t
may
be necessary
to
remove the
two
yell
ow
leads from
thegasto
ensure
that
the
valve
does
not
modu
la
te
and
mainta
i
ns
a
fixed
maximum burner pressure, for the purposes
of
balanci
ng
the system.
lftheh
ea
t load
is
in eKcessof
15
kW {51
.200
B
tu
/h) then reset the
contro
ls to the
maximum
of
l9
kW
( 64,
800
Btu
/h
) by
carefully
ro
tat
ing
the
adjustmen
t
potentiomete
r
anti
-c
l
ockwise.
See Fig.
31
_
Ac
cess
is
gain
ed
to
the
adjustment
po
i
nt
hy
lowe
ring the electrical
cont
rol panel.
1 3 _
Shut
dow
n all the radiators
but
one and observe the burner
press
ur
e fall in response to
the
lower
output
requirements.
Open
1111
the radiators and check
that
the burner pressure
ri
se
s.
29
14.
Witl'l the boiler o
pe
r
at
ing in the central heating mode,
ensure the room thermostat, if
fitted
, is set to maximum.
Check
the
operation
of
the flame failure device and boiler
thermostat.
(a)
Turn the pi
lot
throttle screw on the gas valve cl
ockwise
until
fu
lly
closed. See Fig.
30
.
(b) Observe through the
viewing
wind
ow
the
pil
ot
a
nd
main
bu
rner
to
go out and
cont
in
uou
s sparking from the spark
el
ect
rode.
kl
Unsc
rew
the pil
ot
thrott
le screw t
wo
fu
ll
turns. Observe
the pil
ot
to re-light and
th
e main burner
to
re-ignite.
(d)
All
ow
t
he
central h
ea
ti
ng
system time
to
warm
up
.
Tum
the
the
rm
os
tat
k
nO
Q
towards
the minimum setting and
observe the
ma
in burner
to
go out. Turn the the
rm
ostat
knub
to
max
i
mum
and
repe~:~t
the
operation.
15
. Position
the
U
ser
Operati
ng
Sw
i
tch
to
OFf
,
or
if
a
program
mer
is f
itted,
switch
to OFF_ Disconnect t
he
pr
essure gauge and retighten the test poi
nt
screw. T
es
t
fo
r
gas soundness around
screw.
16.
Stick the
arrow
on the
da
ta badge in the space
provi
dsd
indicating the heat
output
and
bu
rner
sett
ing pressure.
1 7.
Rep
lace the a'ec
tr
ical tray in reverse order (
see
In
struct
ion
12).
Pos
ition the Users Sw i
tch
to OFF o
r,
if
a programmer
is
fitte
d. position
th
e selector
switc
h
cs
to OFF.
Rep
lace the
wh
ite cabi
net
fmn
t
cove
r.
18
. Position the room thermos
tat
if fi
tted
to the desired settinQ.
14.
USER'S
INSTRUCTIONS
Hand the Users In
st
ructi
ons
to
t
he
user or purchaser for
relention and instru
ct
in the e
ff
i
cient
and safe operation
of
t
he
applia
nce
e
nd
heating/
hot
water
system.
A
dv
ise
the
user or purchaser of the p
re
cautions necessa
ry
to
prevent damage to
the
heati
ng
/h
ot
wa
t
er
syst
em a
nd
to the
buildingintheevento
fth
eheatingsystemremaininginoperal
iv
e
during
fmst
condi
tio
ns.
In
form the User
of
the
syst
em pressure on a sealed sy
st
em
installation and advise them
not
to operate the unit
if
a
drop
in
pressure is observed on the pressure gauge i
nd
ic
at
i
ng
a loss of
wa
ter
from
the
system.
Finally advi
se
the u
se
r or purchaser that for continued
eif
ici
ent
and safe operatton
of
the appliance it is important that adequate
servicing
is carried
out
at
i
nte
rvals
re
commended by the Local
Gas Region.
Worcester
Heat
Systems
Ltd. will be pleased
to
discuss and
offer
a comprehensive
maintenance
contract.
15.
ROUTINE
CLEANING
AND
INSPECTION
1 . T
he
fot
l
owing
should
be
carr
ie
d o
ut
at
peri
ods
not
exceeding one year.
(a
I
Ca
r
ry
out
a pre-servi
ce
che
ck
and
note
any operal'ional
fau
l
ts
. ·
(bl Clean
the
fan.
l
cl
Clean
the
burner.
(d) Clean
the
heat
elCchao
ger.
(el
Clean
the
burner and
pilot
injec
tors
.
(f) Check the condi
tion
of the spark ele
ctr
ode
tg)
Chec
k
the
cond
it
i
on
of
the
com
bust
io
n
chambe
r
insulati
on
.
(h
1 Check
that
the
fl
ue
te
rminal
is
un
o
bstructed
and
that
the
flue
sy
st
em
, including t
he
flue can
opy
assemb
ly
, is sealed
co
rr
ect
l
y.
m If the Dppliance has been i
nsta
lled in a
compartment
,
check
that
the
ven
tilat
ion areas are clear .
SOME
OF
THE SERVICING
POI
N
TS
ARE COVERED MORE
FULLY
~N
THE
FOLLOW~NG
lNSTRUCTIONS.
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