20
5.3
DHW FLOW RATE
A flow r
egulator is supplied factory fitted to the appliance to
ensure that no adjustment is necessary. Should the mains flow rate
be below the minimum required, it is possible to remove the flow
regulator from the appliance as instructed in section 9. The
nominal pre-adjusted flow rate may vary by ± 5 % due to factory
tolerances and mains water pressure fluctuation.
21
THE APPLIANCE
5.5
LOCKOUT INDICATION AND RESET
In the event of failur
e during an ignition sequence, (5 attempts), the
Digital display shows fault code ‘3’. In order to reset the boiler, turn
the control knob anticlockwise to ‘STANDBY’ position and then back
to ‘ON’ within
two
seconds.
5.4
FINAL CHECKS
a)
T
urn the control knob to standby.
b)
Remove the manometer and tighten the appliance inlet
pressure test point screw. Re-light the burner and test for gas
tightness.
c)
Fit the appliance fr
ont casing as illustrated in Figure 21. Fit
the front panel in position using locating lugs at the top and
screws underneath.
d)
Set the heating and hot water contr
ol to the required setting.
Ensure that the clock override switch is in the timed position and
check that the time clock is set at the desired time periods. Set the
room thermostat (if fitted) to the required setting.
5.6
FROST PROTECTION
The appliance is fitted with a fr
ost protection device. In the event
of very cold conditions, the 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 and the appliance is left ON.
The time clock can be switched to the OFF setting.
5.7
OVERHEAT PROTECTION
The appliance incorporates flow and r
eturn thermisters, which
monitor the appliance’s operating temperature. Abnormal
temperatures 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.
5.8
OTHER FEATURES
The following additional featur
es are included in the appliance
specification:
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.
ANTI PUMP SEIZURE DEVICE:
Pr
oviding that a power supply is maintained and the appliance
ON/OFF switch is ON, the pump will operate for at least 20
seconds in every 23 hours (regardless of heat demand) to
prevent pump seizure during periods where the appliance is not
used.
CH SOFT ST
ART DEVICE:
After ever
y burner start, in CH mode, the burner output stays at
low for 10 seconds, to ensure smooth heat up of the system and
maximum efficiency.
KEEP-HOT F
ACILITY:
This featur
e is designed to provide hot water very quickly without
wasting too much water. Therefore you may notice that after
EVERY hot water draw-off the burner may stay on for a short
period of a few seconds. This is to pre-heat the hot water circuit
and prepare the appliance for the next hot water draw-off.
SUMMER MODE:
T
o avoid resetting the control knob temperature to ‘standby’ in
summer when CH is not required, switch the clock over-ride
switch to the
OFF
position.
SER
VICE MODE:
The appliance enters the SER
VICE mode by turning the control
knob to ‘SERVICE’ (full clockwise). The LED displays a flashing
‘C’. In this mode the appliance runs at the minimum CH output.
This mode allows the gas valve offset and CO2 emissions to be
measured. To increase the output to maximum turn the control
knob back on and return to Service within two seconds.
