18
6.7
AUTOMATIC CONTROLS CHECK
6.7.1
Ignite the Pilot and Main burners and allow to operate for 15 minutes to ensure stability.
6.7.2
Set the TIME CONTROL (if fitted) to
‘ON’.
6.7.3
Turn the Thermista-stat or room thermostat slowly clockwise until the Main burner ignites.
6.7.4
Ensure that the fan starts to operate after a short period (approx. 1-2 minutes).
SYSTEM E-T models
:
6.7.5
Ensure that the fan speed increases to full speed.
6.7.6
When the temperature reaches the control setting, check that the main burner cycles ON and OFF, at
approximately 75 to 120 seconds.
BASIC CONTROL models
:
6.7.7
When the temperature reaches the control setting, ensure that the Main burner extinguishes followed by the fan
switching off after a short period.
6.7.8
When the temperature falls below the control setting, ensure that the Main Burner re-ignites followed by fan
operation.
6.8
SAFETY CHECKS
:
6.8.1
On the Multifunctional control, rotate OPERATING CONTROL clockwise to the ‘
’ position and ensure that the
OPERATING CONTROL fully resets, and both Pilot and Main Burners are extinguished.
6.8.2
Switch OFF the electrical supply to the air heater.
6.8.3
Release the securing screw and hinge down the fan chamber door.
6.8.4
Disconnect the air circulation fan as follows:
a.
System E-T models:
disconnect the 2 x red conductors at the terminal block terminals
‘30’
and
‘31’
b.
Basic control models:
disconnect the 2 x black conductors at the terminal block terminals
‘16’
and
‘18’
6.8.5
Switch ON the electrical supply to the air heater.
FAN CONTINUES TO RUN, OR CYCLES AFTER HEATING IS TURNED OFF
DISCONNECT
TERMINALS ‘17’ &’18’
Y
N
REPLACE FAN DELAY/
LIMIT CONTROL
REPLACE
ELECTRONIC
MODULE
DOES
FAN
RUN ?
N
CHECK FOR
VOLTAGE AT
TERMINALS
30 & 31
MAIN BURNER ON, BUT FAN NOT RUNNING
Y
N
BRIDGE OUT
FAN DELAY AT
TERMINALS 21 & 22
Y
REPLACE FAN
DELAY/LIMIT
CONTROL
REPLACE
ELECTRONICS
MODULE
DISCONNECT FAN LEADS
FROM CAPACITOR, AND
CONNECT DIRECT TO FAN
DOES
FAN
START?
DOES
FAN
START?
REPLACE
CAPACITOR
Y
REPLACE
FAN
N
MAIN BURNER NOT CYCLING
(
ROOM TEMPERATURE TOO HIGH)
REPLACE
MULTIFUNCTIONAL
CONTROL
N
Y
REPLACE
ELECTRONICS
MODULE
DISCONNECT
MULTIFUNCTIONAL
CONTROL AT
TERMINAL 15
N
DOES
BURNER
GO OUT?
DISCONNECT
THERMISTA-STAT
REPLACE
THERMISTA-STAT
Y
DOES
BURNER
GO OUT?
1
Operating control
2.
Burner Pressure Adjuster
3.
Outlet Pressure test point
7
Sit
E V
2
PI-
LOT
E
A
1
2
3
Fig. 4
Multifunctional Control
