HAMWORTHY HEATING LTD
LILLIPUT HE
500001047/F
14
Smoke Number
less than 2
Flue gas exit temp. 200 deg. C
Temp. rise across
boiler
less than 20 deg. C
n.
Switch off boiler. Remove oil pressure gauge
and replace sealing plug complete with
gasket.
o.
Restart boiler and cycle it on and off several
times to ensure reliable burner ignition and
boiler operation.
Check for oil and water leaks.
Check all cleaning door, burner mounting and
flue hood joints for flue gas leakage and
tighten all fixings.
p.
Set boiler control thermostat to required
setting, and check operation of heating
control system.
q.
Fully familiarise the user with the boiler
operating controls, the main component
functions and the safety features.
THESE INSTALLATION AND SERVICING
INSTRUCTIONS SHOULD BE LEFT WITH THE
USERS OF THE BOILER FOR THEIR FUTURE
REFERENCE.
8.3
Gas fired Boilers
a.
Check that ignition electrode and ionization
probe are correctly positioned. Refer to
manufacturer's technical information supplied
with the burner.
b.
Check that ignition electrode and ionization
probe leads are connected.
c.
Check blast tube is correctly located, and
securely fastened in place, and internal
combustion chamber baffle is correctly
located.
d.
Check burner seats correctly onto burner
mounting plate and is securely fastened in
place.
e.
With firing head separate from burner adjust
air and gas settings, as specified in the
manufacturer's technical information supplied
with the burner.
f.
Determine minimum burner gas pressure
which corresponds to required burner output
(boiler input), as follows:
From the manufacturer's technical information
(supplied with the burner) take burner
pressure corresponding to required burner
output.
Add combustion resistance (in mbar), given in
Section 2.1 for boiler in question, to obtain
gas pressure value to be measured at burner
test point.
g.
Open main isolating valve in gas supply to
boiler. Check for leaks throughout gas train
and pipework to burner.
h.
Adjust gas supply governor to achieve at least
17.5 mbar (7.0 in wg) at inlet to boiler gas
train. Ensure that maximum pressure of gas
train governor is not exceeded.
i.
Adjust start and main output gas rates as
detailed in the manufacturer's technical
information supplied with the gas train.
j.
Check that overheat thermostat manual reset
is set, and that boiler control thermostat and
control system are set to call for heat.
k.
Close main isolating valve in gas supply,
switch the boiler on and start the burner. The
burner control will first operate the fan to pre-
purge the boiler, then produce an ignition
spark and attempt to ignite the burner. The
flame should fail to ignite and the burner
should go to lockout.
l.
Open main isolating valve in gas supply. If
gas train has separate pilot gas line, open
pilot gas isolating valve and close main gas
isolating valve. Restart boiler/burner. The
burner control will pre-purge, produce an
ignition spark and ignite pilot flame. The main
flame should fail to light, and burner will
continue running on ignition flame only. The
pilot gas rate can be checked and adjusted.
IF BURNER FAILS TO LIGHT, BOILER MUST BE
PRE-PURGED BEFORE ATTEMPTING TO
RESTART BURNER. IF BURNER REPEATEDLY
FAILS TO LIGHT, A FULL INVESTIGATION TO
FIND CAUSE SHOULD BE MADE.
m.
Stop boiler/burner. Open main gas isolating
valve and restart burner. The burner will pre-
purge, ignite pilot flame and, after a short
delay of several seconds, the main flame will
light.
n.
After allowing burner to reach stable firing
conditions for approximately 15 minutes, carry
out combustion gas check.
Measure
CO
2
, CO, flue gas temperature, and
circulating water temperature rise across the
boiler. The readings obtained should be as
follows:
CO
2
9-10%
CO
Less than 100 ppm
Flue gas exit temp. 190° C
Temp. rise across boiler. Less than 20° C
o.
After all other adjustments have been made,
set burner air pressure switch as instructed in
manufacturer's technical information supplied
with burner.
p. Check gas pressure at burner head
corresponds with value determined from
burner manufacturer's technical information -
as detailed in (f) above.
q.
Check gas flow rate at meter. Ensure that all
other appliances served by the meter are
isolated whilst flow rate is checked.
r.
Cycle boiler on and off several times to
ensure reliable burner ignition and boiler
operation. Check for gas and water leaks.
