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13.
COMMISSION THE
APPLIANCE
After the appliance has been finally connected and the heating
system flushed out (See Section 1 Paragraph 2 Installation
Warning). check that the electricity supply is off, gas service
cock is off and the appliance thermostat knobs are turned to
maximum und the system controls are calling for heat.
1 .
Open all radiators and lockshield valves and fill the system.
Vent as necessary. See Section 9.3. Check for water
soundness.
2.
Switch electrical supply on at mams socket.
NGTE: Immediately mains electriCity is applied to the
boiler the pump delay timer is energised causing the pump
to run for about 5 minutes, this occurs whether or no' the
controls are calling for heat. The pump will subsequently
only run in the course of the normal operation of the boiler.
3.
Position the User's Operating Switch to HEATING AND
WATER. If a programmer is fitted, set the HW and CH
select buttons to OFF. Leave the system to work in a cold
state for about 20 minutes, venting as necessary. Position
the User's Operating Switch or programmer to OFF.
4.
Turn the gas on at the gas service cock.
5.
PtJsh hard on the gas valve l1utton and keep it pressed in.
At the same time, separately push in the rerl igniter button.
Wh:~n
it clicks, the pilot--seen
th~ouqll
the tnspect1on
window-- should light !f the pilot does not light
immediately, press the 1gniter button repeatediy until it
does. Vlhen the pilot lights, continue to hold the gas valve
button
Ii-I
for a further 1 5 seconds, then release it slowly.
CAUTION: If the pilot does not stay alight, twist the gas
valve button in the direction of the arrow. Wa11 for three
minutes and repeat operation 5 until tht> r;:;)t is lit.
Cont1nue to hold the gas valve button in for a
ic;ll~1er
period,
then release it slowly. Check the pilot flame length is
i-l~o
indicated in Fig. 17.1f it is not, then adju<:i_ L:sing the pilct
throttle {see Fig. 12), clockwise to reduce ti:o :,iz:e or anti-
clockwise to increase the size of the pilot flume.
NOTE: Minimum recommended therrnocouple output is
SmV closed circuit.
6.
Loosen the burner pressure test po1nt screw one
tur~
.=md
connect a pressure gauge. See Fig. 12.
7.
Position the Users Operating Switch to HEATING AND
WATER, or if a programmer is fitted set the CHand HW
select buttons to ON. Check the main burner igni:es
smoothly.
8.
Test for gas soundness around the boiler gas components
using leak detection fluid. Refer to Section 16, Paragraph
6(c) for details on the method of checking the burner
manifold joint for gas soundness.
Turn off the boiler and replace the br::iler inner cas1ng
immediateley after checking the gas soundness. Check
the ma1n bur·ner through the viewing window.
Check the burner setting pressures. See Technical Data.
ADJUSTING DHW !HIGH) GAS PRESSURE
Refer to Fig. 12.
(a)
Allow the boiler to fire for at least 10 minutes before
making any adjustments.
(b)
Turn the DHW thermostat to maximum. Turn the
HEATING thermostat OFF.
{c)
If DHW service gas pressure needs adjustment refer to
TECHNICAL DATA. Using a 10 mrn blade width screw-
driver, turn the screw 'A' clockwise to increase and
counter-clockwise to decrease pressure until the desired
setting is achieved.
(d)
Check several times if main burner ignites smoothly, by
operating the DHW thermostat, before proceeding to
check the HEATING (LOW) gas pressure.
ADJUSTMENT OF HEATING I LOW) GAS PRESSURE
Refer to Fig. 12.
(e)
Turn the DHW thermostat to OFF. Set the HEATING
thermostat to maximum.
13
{f)
If the HEATING gas pressure requires adj ..
;:;;tll1t!',
TECHNICAL DATA.
(g)
Using a small screwdriver turn the screw 'D
~:lo:
··=:,:
increase and counter-clockwise to decreaf:e pres:;,!re t_.r.·
the desired setting is achieved.
(h)
Operate the HEATING thermost;-;t ::;cvcraltirnes tn .;r:st•r'"
the main burner ignites smoothly hcfore che,-king
tl-idl
gas valve switches from HIGH to LOW correctly
{i)
Using the DHW and HEATING control thermo:;tats :;wild,
the boiler from HIGH to LOW and back
~;evernl
trmes to
ensure correct gas pressures. Replace the plastic cap 'C'.
9.
Position the Users
Opcratin~J
Svvrtch
!tl
OFF, or, i" a
programmer is fitted set CH ond H.W
~;elect
buttons to
OFF. Disconnect the pressure
~JilU~p
and
reti~htr=on
the
test point screw.Test for soundness mound the screw
10. Check the operation of the flame failure device Lo ensure
that it will shut off the gas to the rna in burner withi,-r 60
seconds, by switching off the electricity supply
id
the:
mains and turning off the gas supply at the· gas cock.,-\ f .-"'
60 seconds, check for the correct operation ot tJ1e firlt nt'
failure device by turning the gas back on at the gas cock
and attempting to re-light the pilot without depre.',· s1ng the
gas valve button. If the pilot can be lit tn this way, tur·rr off
the gas supply and contact Worcester Herlt Svstems
Service Dept.
11. Position the Users Operating Sw1tch to HEJ\TING :'UH)
WATER. or, if a programmer is fitted. set sclc;_-.! bL:do;,
to ON. Re-light the appliance and ollm" it
-.
Cif!
:r
:t·'
venting as necessary.
NOTE: It will take about 12 minutes for
d11
t,
be satisfied before the central hedtlng ;.,yst..crr-. ,,,,, 11 r
cc- .
•;t
hr=oat.
Check for water soundness.
Important: The complete applicmce must be
ci-,d_.kt
:1
I i'l'
water leaks. Should any leaks be found tr·,ey
n'~tst
t,c
rectified before proceeding further.
Check for spillage from the
divertc~.-
(JLJtlet .:Jt the rtr;l-t :- il'•' ·
srdc of the
:;p~ltance
as spccifil .-]
•!-\
l3.S.
~).;.L:j(,
1 )
1~78
12. ?ositiOil
th~_:
Users
Operatin~J
S'J'iltCh
10
0/ r
,_,
programmer is fitted set select
bt1t1an~;
to (HT ·
the electrical supply off at the
ma~n~;.
Tun tht :;tl·_, ..
off at the gas valve as stated in paragr;:ph 5. C
'':1 .
1·
water from the appliance and the sysL:rn from thf.: ut ,-··r
point~,;
while the water is still hot.
'13. Ref1ll rhe appliance and system (see
ln~truction
:)
repeat
lnstructi~ms
2 Jnd 3.
14. Light the pilot (see Instruction 5) and repeat lnstrliCtlon /
15. Check for correct operation of the user controls !nr::
the room thermostat (if fitted) and IP-ave
~-;';(
t:.
customers requirements.
Fig. 12. Gas Control Valve
I
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