g)
If the burner fails to light the fan will stop. Initially this may be due
to air in the gas supply line. The boiler will automatically have five
attempts at ignition. It may be necessary to turn the CH
Temperature Control knob fully anti-clockwise to reset position
and repeat (d). (See section 5.4).
h)
When the boiler has lit the display will show '
H
.'. Allow the
appliance to run for at least 10 minutes and check that the gas
supply pressure measured at the appliance inlet pressure test
point is 20 ± 1 mbar for natural gas, and 37 ± 1 mbar for propane
appliances.
FINAL CHECKS
5.3
a)
Turn off the appliance and remove the manometer. Tighten the
appliance inlet pressure test point screw. Re-light the burner and
test for gas tightness.
b)
Fit the appliance casing as illustrated in Figure 24. Position and
secure both side panels and the decorative front cover with screws
at the top and bottom.
c)
Fit the appliance hinged front panel in position with two screws at
the top and bottom.
d)
Set the CH Temperature Control to the required setting. Set the
room thermostat (if fitted) to the required setting. Refer to hot water
cylinder instructions.
If the boiler is connected to a hot water cylinder the
CH temperature has to be set to high.
LOCKOUT / RESET INDICATION
5.4
In the event of failure during an ignition sequence, (5 attempts) the LED
displays fault code '
3
'. In order to reset the boiler turn the CH
Temperature Control anticlockwise to 'STANDBY' position and then back
to 'ON' within
two
seconds.
22
7
SEGMENT
DISPLAY
CH
CONTROL
KNOB
SET TO
MEDIUM
FASCIA PANEL AND CONTROLS
23
INLET PRESSURE TEST POINT
FROST PROTECTION
5.5
The appliance is fitted with a frost protection device. In the event of very
cold conditions, the external pump may operate and the appliance light
for a few minutes to protect the appliance and system from potential
frost damage. This can only function if the gas and electricity supplies
are maintained.
OVERHEAT PROTECTION
5.6
The appliance incorporates flow and return thermostats, which monitor
the operating temperature. Abnormal temperatures such as
overheating will cause the appliance to go to lockout and the LED display
will show code '
1
'. Allow the appliance to cool and turn the CH
Temperature Control knob fully anti-clockwise to the reset position to
clear.
OTHER FEATURES
5.7
The following additional features are included in the appliance
specification:
ANTI-CYCLE DEVICE:
When the appliance cycles on its central heating control thermostat, a
slow cycle device operates. The timer (set to 5 minutes) is activated after
the end of each burn cycle to prevent rapid cycling of the burner.
CH SOFT START DEVICE:
After every burner start the burner output stays at low for 3 minutes,
to ensure smooth heat up of the system and maximum efficiency.
SERVICE MODE:
The appliance enters the SERVICE mode by turning the control knob
fully clockwise. The LED displays a flashing '
H
.'. In this mode the
appliance runs at the minimum CH output. This mode allows the boiler
emissions to be measured.
GAS INLET
PRESSURE
TEST POINT
GAS SERVICE
COCK
22
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