HAMWORTHY HEATING LTD
20
WESSEX 100 M
500001080/F
waterways. Results should be compared with
previously measured values to establish possible
loss of efficiency.
Note:
Should remedial work be carried out on a
module, then the 2A control fuse
MUST
be removed
from the non-firing module so as to prevent
accidental operation in the event that the installation
is required for ongoing heating requirements.
13.2 Annual Service
The procedure detailed relates to a single module
and
MUST
be carried out on ALL individual modules
which constitute a unit. Before servicing the boiler,
the following procedure must be carried out :-
WARNING: Isolate all electrical supplies and
turn off the gas service valve.
1)
Remove the front casing door by using a
screwdriver to rotate the ¼ turn latches.
2)
Remove the two bottom screws securing the
control panel to the casing sides and swing the
panel up. Secure the panel in the up-swung position
by locating one of the mounting screws into the
hank bush located on the left hand side panel
approximately 80mm above the position from which
the screw was originally removed.
3)
Disconnect the flame probe lead at the probe,
and the igniter lead at the plug and socket. Unplug
the fan and solenoid cables from the bottom left of
the control panel. Disconnect the pressure sensing
tubes from the air flow sensing venturi, noting the
relative positions.
4)
Remove the gas pipe (refer Figure 14.5 p26) by
unscrewing the fitting at the base of the gas valve.
Push the pipe into the fan case, then drop down and
remove. Discard sealing washer.
5)
Remove the 4xM5 nuts securing the fan motor
plate to the fan case and withdraw the motor
complete with the fan impeller. Check the condition
of the impeller and clean with a soft brush taking
care not to dislodge any balance weights.
6)
Remove the 2 x M6 nuts securing the fan case /
burner assembly and carefully withdraw the burner
from the heat exchanger. Remove the two nuts
securing the swirler to the burner and the four bolts
securing the fan case to the swirler. Check the
condition of the swirler and clean if necessary with a
soft brush taking care not to disturb the swirler
blades. Similarly check and clean the fan casing /
damper assembly taking care not to disturb the
damper positioning.
7)
Remove the single socket cap head screws
securing the igniter and flame probe to the burner
flange. Carefully withdraw the igniter and probe.
Remove the loose flange and Mica sight glass
Pressure switches are fitted to monitor the correct
operation of the fan and air inlet damper assembly
at both High and Low fire. They ensure sufficient
airflow through the boiler to facilitate correct
combustion at all times.
Should the position of the
air inlet damper be tampered with, the
performance of the air pressure switches will be
affected. Refer to Hamworthy Heating Ltd.
The
control circuit is configured to establish a light/dark
check thereby ensuring the switch is open (no air)
before starting the fan. Once started, the circuit then
checks that the switch has changed position (air
proved) thus allowing the boiler to light and continue
firing. Should the air supply fail at any time, the
burner will immediately shut down and attempt a re-
light, which if unsuccessful results in lockout.
Restoration of the power supply after an
interruption, results in a full light up sequence to
safely restart the burner. Power failure after a
lockout, will not interfere with this condition when the
supply has been restored.
To ensure safe operation, an optional low gas
pressure switch is available. Should the gas
pressure fall below the pre-set level, the appliance
will not operate. Refer to kit instructions for details.
12.2 Fault Finding Procedures
General fault finding is shown in Figure 12.2 (p21/22).
If the boiler still cannot be operated satisfactorily after
following the chart, consult your local office of
Hamworthy Heating for assistance.
12.3 Possible Causes of Boiler Lockout
1) Ignition failure due to no power at the hot surface
igniter.
2) Ignition failure due to faulty gas valve.
3) Ignition failure due to broken igniter or flame probe
lead.
3) No or low gas supply pressure.
4) No ignition due to faulty controller.
13.0 SERVICING
A competent person registered for working on non
domestic gas appliances should check and ensure
that the flue, its support and terminal, the ventilation
to the boiler house, safety valve, drain, water filter if
fitted, pressure gauge, etc.; are in a serviceable and
working condition and still comply with the relevant
standards and codes of practice - see
Section 3
(p5).
13.1-Regular annual servicing is recommended
,
preferably by a Hamworthy appointed person, to
ensure trouble free operation. Although cleaning of
flueways may not be necessary on a yearly basis, it
is important that all controls and safety features are
checked for correct operation.
NOTE!
Measuring
flue gas CO
2
and gas temperatures will give an
indication of the state of the boiler flueways and
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