22
24
THE APPLIANCE
5.4
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.
5.3
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 24 using
locating lugs at the top and screws underneath.
d)
Set the heating contr
ol to the required setting. Set the room
thermostat (if fitted) to the required setting.
Allow the appliance to cool and turn the control knob fully anti-
clockwise to reset.
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, 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.
SOFT ST
ART DEVICE:
After ever
y burner start, the burner output stays at low for 10 seconds,
to ensure smooth heat up of the system and maximum efficiency.
SUMMER MODE:
T
o avoid resetting the control knob temperature to ‘standby’ in
summer when CH is not required, switch the programmer or room
thermostat to
OFF
.
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 CO
2
emissions to be measured. To
increase the output to maximum turn the control knob back on and
return to Service within two seconds.
5.5
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 external time clock (if fitted) can be switched to the OFF setting.
5.6
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’.
5.7
USERS INSTRUCTIONS
Upon completion of commissioning and testing the system, the
installer must instruct the user in how to operate the appliance by
drawing the user’s attention to the following.
a)
Give the ‘Users Instr
uctions’ to the householder and
emphasise their responsibilities under the ‘Gas Safety (Installation
and Use) Regulations or rules in force.
b)
Explain and demonstrate the lighting and shutdown pr
ocedures.
c)
Advise the householder on the ef
ficient use of the system,
including the use and adjustment of all system controls for CH.
d)
Advise the user of the pr
ecautions necessary to prevent
damage to the system, and to the building, in the event of the
system remaining inoperative during frost conditions.
e)
Explain the function of the contr
ol knob, and how to reset the
appliance. Emphasise that if cut-outs persists, the appliance should
be turned off and the installer or service engineer consulted.
f)
Str
ess the importance of an annual service by a registered
heating engineer.
g)
The electrical mains supply to the appliance must r
emain ON
for the frost protection circuit to operate.
5.8
APPLIANCE LOG BOOK
A logbook is supplied with this appliance to r
ecord installation
and commissioning details and to make future servicing of the
appliance easier.
This logbook forms part of the industry’s Benchmark code of
practice for the installation, commissioning and servicing of
central heating systems.
Please ensure that the logbook is fully completed and left with the
customer for future reference, along with Users Instructions and
this Installation and Servicing Instruction manual.
