14
19
FAN OPERATES, BUT BURNER CYCLES BEFORE REQUIRED TEMPERATURE IS REACHED
BRIDGE
THERMISTA-STAT
N
CHECK AIR FILTER &
RETURN AIR PATH FOR
RESTRICTIONS
SET FAN SELECTOR TO
AUTO & BRIDGE AIRFLOW
SENSOR
N
CHECK TEMPERATURE
RISE ACROSS HEATER IS
LESS THAN 60
°c
CHECK TTB, LIMIT SWITCH
& CONNECTIONS
Y
Y
CHECK MAIN
BURNER
PRESSURE SETTINGS
ARE CORRECT
SET TO CORRECT
PRESSURE SETTING
N
Y
SET FAN
BALANCING SCREW
Y
DOES
FAN
SPEED
UP?
N
Y
REPLACE
ELECTRONIC MODULE
REPLACE
ELECTRONIC MODULE
REPLACE
AIRFLOW SENSOR
IS
PAT H
CLEAR?
N
CLEAR RESTRICTIONS
AND BLOCKAGES
CHECK FAN BALANC-
ING SCREW IS
CORRECTLY SET
N
DOES
FAN
SPEED
UP?
N
Y
SET FAN SELECTOR
SWITCH TO
CONTINUOUS
DOES
BURNER
STAY
LIT?
REPLACE
THERMISTA-STAT
Y
REPLACE
ELECTRONIC MODULE
N
Y
IS
OVERHEAT
CONTROL
OK?
NON-MODAIRFLOW models:
8.9.6 Disconnect the following:
a.
Disconnect 230V connections (L/N/E) from the Fan Assembly,
b.
230V mains ‘
L
’, ‘
N
’ and ‘
E
’ from connection block terminals ‘
1
’ and ‘
3
’, and earth stud respectively,
c.
Room thermostat from connection block terminals ‘
5
’ and ‘
6
’,
d.
Limit switch ‘
LOAD
’ and ‘
COMMON
’ connections,
e.
Fan Control ‘
LOAD
’, ‘
COMMON
’ and ‘
EARTH
’ connections,
Both model types:
8.9.7
Disconnect 2 x TTB connections.
8.9.8
Disconnect the Multifunctional Control connections.
8.9.9
Disconnect the Water Circulator electrical connections (if fitted).
8.9.10 Release 4 x 4mm screws securing the Electrical assembly to the heater cabinet and remove the Electrical assembly,
releasing wiring from cable clamps and grommets as required..
8.9.11 Refitting or replacement is in reverse order.
8.10
ELECTRONIC MODULE REMOVAL (MODAIRFLOW MODELS ONLY)
8.10.1 Remove the Electrical Assembly as detailed in sect 8.9.
8.10.2 Disconnect the Electronic Module from the Electrical Assembly.
8.10.3 Release 3 x screws securing the Electronic Module to the Electrical Mssembly and remove the module.
8.10.4 Refitting or replacement is in reverse order.
8.11
TRANSFORMER REMOVAL (MODAIRFLOW MODELS ONLY):
8.11.1 Remove the Electrical Assembly as detailed in sect 8.9.
8.11.2 Disconnect the Transformer from the Electrical Assembly terminal block, and the fuse from the Earth stud,
8.11.3 Release 2 x screws and nuts securing the Transformer to the Electrical Assembly, and remove the Transformer.
8.11.4 Refitting or replacement is in reverse order.
8.12
TIME CONTROL REMOVAL:
8.12.1 Ensure that the electrical supply is isolated.
8.12.2 Release the securing screw situated on the lower face of the Time Control and remove it by partially withdrawing
bottom of the Time Control and then lifting upwards.
8.12.3 Disconnect the Time Control electrical connections from its integral terminal strip.
8.12.4 Refitting or replacement is in reverse order.
8.12.5 Set the Time Control to the required ON and OFF times.
8.12.6 Set the Time Control to the correct time.
8.13
FAN DELAY CONTROL, LIMIT SWITCH AND AIRFLOW SENSOR REMOVAL:
NOTE: Airflow sensor applies to MODAIRFLOW models only, whilst Fan Delay Control applies solely to non-MODAIRFLOW
models.
8.13.1 Ensure that the electrical supply is isolated.
8.13.2 Remove the appliance lower and upper doors.
8.13.3 Release 2 x 4mm screws securing the Limit Switch cover and withdraw the cover.
8.13.4 Disconnect the required control/switch.
8.13.5 Release 2 x securing screws and remove the required control/switch.
8.13.6 Refitting or replacement is in reverse order.
