Glow-worm Betacom C - Manual (Page 6)

6
Boiler Design
Boiler Design
These boilers are designed for use as part of a sealed water
central heating system with fully pumped circulation. The
pump, expansion vessel and associated safety devices are all
fitted within the boiler.
The appliance has a built in frost protection device that
protects the boiler from freezing.
Once the controls are set the boiler operates automatically.
Electrical Supply Failure
The boiler will not work without an electrical supply.
Normal operation of the boiler should resume when the
electrical supply is restored.
Reset any external controls, to resume normal operation of
the central heating.
If the boiler does not resume normal operation reset the
appliance. If the boiler does not resume normal operation
after this call your Installation/Servicing company or
Glow-worm service.
Overheating Safety
The boiler software is designed to recognise the potential for
an overheat (Boiler Lockout). The temperature of the water
flowing from the primary heat exchanger is monitored by an
overheat thermostat located on the outlet pipe. If the water
temperature gets too hot the switch opens, cutting off the
electrical supply to the gas valve and causing the boiler to
‘Lockout’. Once activated the boiler has to be manually re-set
by switching the control knob off (for 15 seconds) and on
again.
Low Water Pressure
A hydraulically operated primary pressure sensor monitors
water pressure or water shortage in the primary hydraulic
circuit and will switch the boiler off if the pressure is below
0.3bar. The boiler will not operate until the circuit has been
re-pressurised.
Flue Blockage
For HK type; an air pressure switch situated in the boiler’s
fan compartment monitors the boiler’s flue operation. If a
partial obstruction within the flue occurs the fan will continue
operating but the boiler’s burner will shut down until the
blockage is cleared.
Safety Devices
Frost protection
The boiler’s control unit has in-built frost protection device
that fires the boiler’s burner when the temperature of primary
hydraulic water falls below 6°C. The device works irrespective
of any room thermostat setting and will protect the complete
heating system. On reaching a water temperature of 15°C the
boiler reverts to normal operation.
NOTE: If the boiler will not be used for long periods of time
during cold weather, in order to avoid freezing the electric
supply must be left ON and all the central heating isolation
valves must be left open. The internal frost protection device
will then operate the boiler if the temperature falls too low.
However, if the electrical supply is to be turned off the boiler,
the heating system and domestic hot water circuit must be
drained.
Safety Discharge Valve
A safety discharge valve and discharge pipe are fitted to the
boiler. This valve must not be touched. Should there be any
discharge from the pipe, isolate the boiler electrical supply and
call your installer or Glow-worm’s own service organisation
using the telephone number on the inside front cover of this
booklet.
Condensate Drain Blockage
As a safety feature the boiler will stop working if the
condensate drain becomes blocked. During freezing
conditions this may be due to the forming of ice in the
condense drain external to the house. Release an ice
blockage by the use of warm cloths on the pipe, the boiler
should then restart.
NOTE: If the boiler fails to resume normal operation and
all external controls are calling for heat, then call your
Installation/Servicing company or Glow-worm service.
Condensate Drain
A plastic drain pipe must be fitted to allow discharge of
condensate to a drain. Condensate should, if possible, be
discharged into the internal household draining system. If
this is not practical, discharge can be made externally into
the household drainage system or a purpose designed soak
away, see section 9 for more details.
Pluming from flue terminal
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.
This is normal and not an indication of a fault.