6
19
6.3
IGNITION OF PILOT AND MAIN BURNERS:
WARNING:
If the pilot burner is extinguished either intentionally or unintentionally, no attempt should be made to
relight the gas for a minimum of 3 minutes. Ensure that the Electrical supply, time control and Selector switches are set
to
‘OFF’.
6.3.1
Set the Thermista-stat/room thermostat to lowest or
OFF
setting.
6.3.2
On the Multifunctional control, remove the Outlet Pressure test point cover, and fit a pressure test gauge (refer
Fig. 4).
6.3.3
Turn the heater Gas supply
ON
, test for gas soundness and purge the whole gas pipe as described in BS6891.
6.3.4
Referring to Fig. 4, partially depress the OPERATING CONTROL and set the control
1
/
4
turn anti-clockwise to
the ‘SPARK’ symbol. Press and hold the OPERATING CONTROL, and whilst observing the Pilot Burner,
repeatedly press the Piezo igniter button until the Pilot burner ignites.
6.3.5
After 20 seconds release the OPERATING CONTROL and let it spring out; ensure that the Pilot burner remains
alight. If the Pilot burner extinguishes, rotate the OPERATING CONTROL clockwise to the ‘
’ position and
ensure that the OPERATING CONTROL is fully reset. Wait three minutes and repeat steps 6.3.4 and 6.3.5,
holding the OPERATING CONTROL depressed for a longer period, until the Pilot burner remains alight.
6.3.6
Ensure that the pilot flame envelops thermocouple tip, if not, check that the pilot orifices is free from
obstruction. The pilot is factory set and is non-adjustable.
6.3.7
With the Pilot burner lit, depress the OPERATING CONTROL and turn it to the position indicated by the flame
symbol.
6.3.8
Set the air heater Electricity supply
ON
.
6.3.9
Set the Time control to required Heating On periods.
6.3.9
Set the Selector switch to ‘TIMED’.
6.3.10 Set the Thermista-stat or room thermostat to MAXIMUM.
6.3.11 Ensure that the main burner has now ignited.
6.3.12 Test for gas leakage at the supply, Multifunctional control, Pilot and Main burners using proprietary detection
fluid and sealing any leaks found.
6.3.13 Allow the heater to operate for a minimum of 15 minutes to ensure stability.
6.4
MAIN BURNER PRESSURE TEST:
NOTE: AIR HEATER BURNERS ARE FACTORY SET TO PROVIDE A NOMINAL HIGH PRESSURE OUTPUT AS
DETAILED IN SUB PARA 1.2
6.4.1
Referring to Table 2 and Fig. 4 below, ensure that the pressure test gauge indicates the correct burner pressure,
resetting if required as follows:
a.
At the Multifunctional control:
i.
Remove the Burner Pressure Adjuster cover.
ii.
Set the Burner Pressure Adjuster to provide a pressure test gauge indication for the correct burner
pressure as detailed in Table 2.
iii.
Refit the Burner Pressure Adjuster cover.
6.4.2
Apply the pressure set arrow to indicate the appropriate burner pressure on the data badge.
6.5
EXTINGUISHING OF PILOT AND MAIN BURNERS:
6.5.1
On the Multifunctional control, rotate the OPERATING CONTROL clockwise to the ‘
’ position and ensure that
the OPERATING CONTROL fully resets, and both the Pilot and Main Burners are extinguished.
6.5.2
On the Multifunctional control, remove the pressure test gauge and refit the Outlet Pressure test point cover.
6.6
TEMPERATURE RISE CHECKS:
6.6.1
Ignite the Pilot and Main burners and allow 15 minutes for stability before continuing.
6.6.2
Check that the temperature rise across the heater is between 45
o
C - 55
o
C, setting the fan speed as follows:
i.
SYSTEM E-T heaters: System E-T provides a fan speed corresponding to the above temperature rise, if
the appliance is to be set to operate at the minimum rate and the ducting has been sized accordingly, set
the ‘RATE SWITCH’ to ‘
MIN
’, thus reducing the fan speed.
ii
BASIC Control heaters, the fan speed is adjusted by selecting the fan speed at control panel
(decrease voltage selection to decrease fan speed).
Fig. 6a, SYSTEM E-T FUNCTIONAL DIAGRAM
r
