Glow-worm Energysaver Combi 80-100 - Manual (Page 22)

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Control Options
There are two control options available: Normal mode and
Holiday mode, see diagram 11.4.
Normal mode uses the domestic hot water and central heating
temperatures selected.
Holiday mode shuts down the domestic hot water and central
heating. However, frost protection and pump exercise
programme remain active. To resume normal operation after a
holiday period, select ‘Normal Mode’,
.
Note: If an external frost thermostat is fitted ‘Holiday Mode’
should
not be selected during periods of cold weather.
Alternatively select setting to turn off the domestic hot
water and turn the central heating off at the programmer or
reduce the room thermostat temp to a low setting.
11.9 Servicing Options
There are four options available to the service engineer,which
are not to be used by the user, see diagram 11.4. They are as
follows.
Installation Mode
This allows interrogation of the appliance by an authorised
engineer, via the connection of a P.C.
After using the installation mode, normal operation of the
appliance can be resumed by reselecting
'Normal mode',
.
Operating Function
The current function that the boiler is performing is shown by a
number with a flashing decimal point, see table below.
DISPLAY ACTION
No demand.
Boiler fan is purging the system.
Ignition phase.
Boiler is suppyling central heating.
Boiler is supplying domestic hot water.
Waiting for the fan to run up to speed.
Boiler is off after reaching temperature.
Central heating pump overrun.
Domestic hot water pump overrun.
Boiler safety shut down.
OPERATING FUNCTION
Minimum Input Lock
This function allows the service engineer to lock the appliance
into delivering minimum heat input to enable accurate combustion
analysis.
Maximum Input Lock
This function allows the service engineer to lock the appliance
into delivering maximum heat input to enable accurate
combustion analysis.
See section 12.6 for details of checking combustion.
Both input locks are not permanent and revert to normal
operation after approximately 15 minutes. The boiler can be
manually reverted at any time by pressing the ‘Reset’ button.
NOTE: If left the display automatically reverts to display
temperature after approximately two minutes.
11.10 Adaptive Control
Adaptive Control is an advanced control feature that requires
the interaction of a room thermostat. It is used in two out of the
four central heating options and allows the boiler to optimise the
heat output. This enables the boiler to operate at much lower
temperatures and hence be more fuel efficient.
If a room thermostat is not fitted when using these modes the
boiler will revert to standard modulation at the temperatures
given in diagram 11.4.
NOTE: When the boiler fires from cold with the adaptive control
active, it fires at low rate for ten minutes before ramping up to
full rate.
For details of wiring in a room thermostat refer to section 10.2
and diagram 10.3.
11.11 Outside Sensor
If an outside sensor is fitted the boiler adjusts the flow temperature
to compensate for variations in external temperature. Only two
central heating options are available which are different to those
in diagram 11.4, these are:
The outside sensor optimises the boiler
flow temperature to suit demand. Normal on/off control is
retained but a room thermostat is required. This is the preferred
option.
For use in systems with a programmer but no room
thermostat. Sets the boiler flow temperature depending on
external temperature. During “off” periods on the programmer
the flow temperature is reduced by 10
O C.
11.12 Operating Sequence
Refer to diagram 11.4 and press the ‘Mode’ button until the
Operating function is displayed.
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11 Commissioning