11
14
8.5
PILOT BURNER ASSEMBLY REMOVAL:
8.5.1
Remove Burner and Controls assembly as detailed in 8.2.
8.5.2
Disconnect the pilot gas feed pipe from the Multifunctional control and Pilot Assembly.
8.5.3
Disconnect the thermocouple from the Multifunctional control, taking care to avoid damage to the capillary.
8.5.4
Release the 4 x screws securing the Pilot Assembly to the Burner and Controls assembly, and withdraw the Pilot
Assembly.
8.5.5
Withdraw the Pilot injector from the Pilot Assembly.
8.5.6
Release the Thermocouple lock nut from the Pilot Assembly and withdraw the Thermocouple, taking care to avoid
damage to the capillary.
8.5.7
Release the Igniter electrode lock nut from the Pilot Assembly and withdraw the electrode.
8.5.8
Refitting or replacement is in reverse order, ensuring that the Pilot Assembly gaskets are not damaged and that the
Pilot Assembly firmly seals with the Burner and Controls assembly. DO NOT over tighten the thermocouple
connection at the Multifunctional control, (finger tight plus 1 flat).
8.6
MULTIFUNCTIONAL CONTROL REMOVAL:
8.6.1
Remove the Burner and Controls Assembly as detailed in 8.2
8.6.2
Disconnect the Thermocouple at the Multifunctional control, avoiding damage to the capillary.
8.6.3
Disconnect the Pilot gas feed pipe from the Multifunctional control.
8.6.4
Disconnect the Multifunctional control input and output supply feeds.
8.6.5
Refitting or replacement is in reverse order.
NOTE:
When refitting or replacing the Multifunctional control, the ‘O’ ring seal is to be replaced.
8.7
PIEZO UNIT REMOVAL:
8.7.1
Disconnect the 2 conductors from Piezo unit.
8.7.2
Release the retaining nut and remove the Piezo unit from its mounting bracket.
8.7.3
Refitting or replacement is in reverse order.
8.8
AIR CIRCULATING FAN, REMOVAL AND CLEANING:
8.8.1
Ensure that the electrical supply is isolated.
8.8.2
Remove the appliance front door, release the securing screw and hinge down the electrical panel.
8.8.3
Remove the 3 x insulator covers and disconnect the fan flying leads, noting their position for subsequent
reconnection.
8.8.4
Withdraw the fan flying lead cable tie from the fan chamber floor.
8.8.5
Release the Fan Assembly securing screw and withdraw the Fan Assembly from the Heater cabinet, avoiding
damage to the fan blades.
8.8.6
Remove all dust from both the impeller and motor, taking care to not disturb the balance of the fan.
8.8.7
Refitting or replacement is in reverse order.
8.9
ELECTRICAL ASSEMBLY REMOVAL:
8.9.1
Ensure that the electrical supply is isolated.
8.9.2
Remove the appliance front door, release the securing screw and hinge down the electrical panel.
SYSTEM E-T models:
8.9.3
Disconnect the following
a.
Air circulation fan flying leads from the capacitor,
b.
230V mains ‘
L
’,
‘
N
’ and ‘
E
’ from connection block terminals ‘
1
’ and ‘
2
’, and
Earth stud
respectively,
c.
Thermista-stat connections from connection block terminals ‘
7
’ and ‘
8
’,
d.
Limit switch from connection block terminals ‘
13
’ and
‘
14
’,
e.
Fan Delay Control from connection block terminals ‘
18
’ and
‘
17
’,
f.
Multifunctional Control from connection block terminals ‘
16
(N) and ‘
15
’ (L), and
Earth stud.
g.
Water heater from connection block terminals ‘
10
’ (L) and ‘
9
’ (N),
h.
Water Pump from connection block terminals ‘
12
’ (L) and ‘
11
’ (N),
i.
Cleanflow from connection block terminals ‘
19
’ (24V) and ‘
20
’ (0V),
j.
Earth lead from the fan chamber floor,
d.
Main burner opera-
i. Gas rate or burner pressure
Check gas rate and burner pressure
ting intermittently
setting high.
setting.
with fan running.
ii. Temperature rise excessive.
Adjust fan speed or gas rate accordingly.
iii. Air filter or return air path
Check filter is clean and air path is clear.
restricted.
iv. Excessive number of outlets
Open additional outlets.
closed.
e.
Main burner opera-
i. Gas rate or burner pressure
Check gas rate and burner pressure
ting with intermittent
setting too low.
setting.
fan operation.
ii. Fan delay control faulty
Replace.
f.
Fan runs for excessive
i. Fan delay control faulty.
Replace.
period or operates
intermittently after
main burner shuts down.
g.
Noisy operation.
i. Gas pressure too high.
Check burner pressure setting.
ii. Noisy fan motor.
Replace fan assembly.
iii. Fan speed setting too high.
Adjust fan speed.
SYSTEM E-T models:
h.
Incorrect operation
Fault related to SYSTEM E-T
Consult diagnostic chart and follow
of fan or main burner.
Control system (refer to pages 15 - 18) recommended procedure.
Basic control models:
j.
Pilot alight but main
i. Mains electrical supply not
Check mains supply.
burner not igniting.
connected to heater.
ii. Controls not demanding heat
Check that time control (if fitted) and
room thermostat are operating correctly.
iii. T3.15A fuse failed.
Replace. If failure occurs again, check
wiring for short circuits.
iv. Loose connection to room thermo-
Check connections.
stat, limit switch, multifunctional
control lead, time control, relay
module or 24V transformer.
v. 230V/24V transformer failure.
Check 24V side with test meter, if voltage
missing, replace transformer.
vi. Faulty relay module
Check 230V at white wire from switch S5
vii. Multifunctional control faulty.
Replace Multifunctional control.
viii.Limit control faulty.
Short circuit control and replace if necessary.
ix. Room thermostat or external
Fit temporary loop in heater thermostat
wiring faulty.
socket. If heater ignites, external circuit
or room thermostat is faulty.
9.3
The SYSTEM E-T module is fitted with a diagnostic light emitting diode (LED) which is visible through a hole in the
module cover, as shown in Fig. 5 below. If the LED is flashing, this means that :
9.3.1
The fan is not connected, or
9.3.2
The capacitor is not connected, or
9.3.3
There is a short circuit in the fan supply.