Johnson & Starley 42-451-09, Инструкции по установке, пусконаладке и обслуживанию

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16. DEFECT DIAGNOSIS
16.1 IMPORTANT: If an electrical defect occurs after installation of the appliance; preliminary earth continuity,
polarity, and resistance to earth checks should be carried out with a multimeter. On completion of any
maintenance/fault-finding task that has required the breaking and remaking of electrical connections,
then checks of continuity, polarity, and resistance to earth must be repeated.
16.2 WARNINGS
16.2.1 When purging or checking gas supplies, ensure that ventilation to the room or cupboard is adequate,
and that all naked lights are extinguished.
16.2.2 SYSTEM E-T models
a. When carrying out any electrical testing, a test meter MUST be used, since low resistance
test devices can cause damage to the Electronics module.
b. Before commencing defect diagnosis, ensure that the Thermista-stat is set to maximum,
mains supply is ‘ON’ and the time control is at an ‘ON’ position.
c. Care is to be taken during the replacement and handling of electronic assemblies, (i.e.,
electronic panel, airflow sensor or Thermista-stat). It is not practical to rectify defects on these
assemblies, except at the manufacturer, and any attempt to do so may render the guarantee
or factory replacement arrangement invalid.
DEFECT DIAGNOSIS
ITEM SYMPTOM POSSIBLE CAUSE REMEDY
1
Pilot will not light.
No gas supply to heater.
Check for gas at inlet pressure test
point on Multifunctional Control.
Gas supply pipe not purged.
Purge gas supply pipe in accordance
with BS 6891.
Pilot orifice restricted.
Clear pilot orifice or replace pilot
injector.
Piezo system faulty. Check igniter, lead, and electrode.
Excessive gas supply pressure.
Check that mains gas pressure is
20mbar, and reduce if necessary
2
Pilot lights but goes out on
releasing START
Connection between thermo couple
and Multifunctional button during initial
light-up, or after normal operation.
Check connection is secure.
Faulty Multifunctional Control Control not secure.
Faulty Thermocouple. Replace Thermocouple
3
Main burner operating
intermittently with fan running
Gas rate or burner pressure setting
high
Check gas rate and burner
pressure setting
Temperature rise excessive
Adjust fan speed or gas rate
accordingly.
Air filter or return air path restricted
Check filter is clean and air path is
clear
Excessive number of outlets closed Open additional outlets
Spillage of flue gases. Carry out spillage test and rectify.
Spillage monitor device (TTB)
faulty
Replace Spillage device (TTB)
SYSTEM E-T
4
Incorrect operation of fan or
main burner.
Fault related to SYSTEM E-T
Control system (refer to pages
17-21)
Consult diagnostic chart and
follow recommended procedure.