Glow-worm EnergySaverCombi 100 - Manual (Page 24)

24 221854B
The operating sequence of the appliance during central heating
and domestic hot water production can be checked against the
following two tables.
DISPLAY ACTION
(Operating
function)
No demand.
Create demand by turning on
a hot water tap.
Pump and fan start.
Fan running up to speed.
Gas valve opens
and ignitor sparks for 3 seconds.
Burner ignites.
Hot water supplied to thermal
store.
End of hot water demand
i.e. hot water turned off.
Burner modulates to bring thermal
store to correct temperature.
Burner shuts down and
pump overrun commences.
No demand.
DOMESTIC HOT WATER SEQUENCE TABLE
6573
11 Commissioning
DISPLAY ACTION
(Operating
function)
No demand.
Create demand by switching on
timer or room thermostat.
Three way valve switches to
central heating
(approx. 15 seconds).
Pump and fan start.
Fan running up to speed.
Gas valve opens
and ignitor sparks for 3 seconds.
Burner ignites.
Burner runs at ignition rate (70%)
for 10 seconds.
Rate drops to minimum for
60 seconds.
Input adjusts according to heating
option selected.
End of heating demand
i.e. room thermostat satisfied.
Burner shuts down and timed
pump overrun commences.
No demand.
3 way valve switches back
to domestic position
(approx 15 seconds).
CENTRAL HEATING SEQUENCE TABLE
6572
11.13 Pump Exercise Program
After a power cut or every 24 hour in holiday mode the three way
valve will switch and the pump will run for one minute to prevent
the components from sticking. This will also occur during
normal operating if there is no domestic or central heating
demand for more than 24 hours.
11.14 Frost Protection
During periods of no demand the boiler is protected by a frost
protection procedure. If the heating outlet temperature falls to
7
°
C the pump will start. If the heating outlet temperature
continues to fall to 3
°
C the burner is ignited. The burner is
extinguished when the heating outlet reaches 10
°
C, the pump
will run for a further 15 minutes. This function primarily protects
only the boiler.
If an additional frost thermostat is fitted, switching of this will
operate the boiler.
11.15 Instruct the User
Instruct and demonstrate the lighting procedure and advise the
user on the safe and efficient operation of the boiler.
Instruct on and demonstrate the operation of any heating
system controls.
Advise the user on the use and maintenance of any scale
reducer and pass on any relevant instructional documents.
Advise that to ensure the continued efficient and safe operation
of the boiler it is recommended that it is checked and serviced
at regular intervals. The frequency of servicing will depend upon
the installation conditions and usage, but in general, once a
year should be enough.
Draw attention, if applicable, to the current issue of the Gas
Safety (Installation and Use) Regulations, Section 35, which
imposes a duty of care on all persons who let out any property
containing a gas appliance.
It is the Law that any servicing is carried out by a competent
person.
Advise the user that, like all condensing boilers this appliance
will produce a plume of condensation from the flue terminal in
cool weather. This is due to the high efficiency and hence low
flue gas temperature of the boiler.
Advise the user of the precautions necessary to prevent damage
to the system, boiler and the building, in the event of the heating
system being out of use during frost or freezing conditions.
Advise the user that the permanent mains electrical supply
SHOULD NOT be switched off, as the built in frost protection
and pump/valve saver program would not be operable.
Reminder, leave these instructions and the ‘Benchmark’ logbook
with the user.