Glow-worm Xtrafast 96-120 - Manual (Page 6)

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Clock-timer instructions for use
The boiler must be conected to the electrical supply and
switched on.
Setting the time
Rotate the clock actuater mechanism clockwise, by hand, until
the current time is indicated by the arrow, see diagram 2.
Note: The time is set in 24 hour format, for example, 1300 for
1pm.
Setting the programme "On" and "Off" times
• Select the "On" times by pushing the white tappets to the
outside, see diagram 2.
• Select the 'Off' times by pushing the white tappets to the inside,
see diagram 2.
The clock shown in diagram 2 is set as follows:
ON - 07.00am to 09.00am (7-9)
OFF - 09.00am to 4.00pm (9-16)
ON - 4.00pm to 10.00pm (16-22)
OFF - 10.00pm to 07.00am (22-7)
Reg 049
Diagram 2 Diagram 3
To override or advance the
clock
The clock has a manual On/
Off switch, see diagram 3,
which operates as follows :
Reg 050
Upper position
Heating On/Off as set by the
tappets.
Middle position
Heating Off continuously
Lower position
Heating On continuously
Draining
Safety Devices
Protection against freezing
If the boiler is to be out of use for any long periods during severe
weather conditions, it is recommended that the whole system,
including the boiler, be drained to avoid the risk of freezing.
If in doubt, consult your servicing company.
Draining and filling
Caution: The boiler is installed as part of a sealed system which
must only be drained and filled by a competent person.
Air flow rate safety device
If an obstruction, even partial, of the flue occurs, for any reason,
the built in safety system of the boiler will turn the boiler OFF and
the fan will continue to run. The boiler will be ready to operate
when the fault has been cleared.
Overheat safety
In case of boiler overheating, the overheat thermostat will turn
the boiler off. The thermostat, located on the heat exchanger
flow pipe, will need to be manually reset. To have this done call
a qualified service engineer or Heatcall (Glow-worm’s own
service organisation) using the telephone number behind the
controls cover door or on the front cover of this booklet.
In case of power supply failure
The boiler no longer operates. As soon as power supply is
restored, the boiler will be automatically restarted.
Frost protection
The XTRAFAST has a built in frost protection device that
protects the boiler from freezing. If the boiler is to be left and
there is a risk of frost, ensure that the gas and electrical supplies
are left connected. The frost protection device will light the boiler
when the temperature of the boiler water falls below 6
° C. When
the temperature reaches 16 ° C, the boiler stops.
Note : This device works irrespective of any room thermostat
setting and will protect the complete heating system.
Heating safety valve
CAUTION: A heating safety valve with a discharge pipe is fitted
to this boiler.
The valve MUST NOT BE TOUCHED except by a qualified
registered person. If the valve discharges at any time, switch the
boiler off and isolate it from the electrical supply. Contact your
installation/service company.
Pressure relief valve
CAUTION: A domestic hot water pressure relief valve, with a
discharge pipe is fitted to this boiler.
The valve MUST NOT BE TOUCHED except by a qualified
registered person. If the valve discharges at any time, switch the
boiler off and isolate it from the electrical supply. Contact a
qualified service engineer or Heatcall (Glow-worm’s own service
organisation) using the telephone number behind the controls
cover door or on the front cover of this booklet.