Installation manual

69
This allows the installer to programme both upper and
lower temperature limits. It may limit the upper and lower
temperature that you are able to set on the thermostat.
Temperature range limitation
This allows the installer to limit the number of degrees
that you can override the programmed temperature by,
it also allows the installer to set rules regarding how
long a temperature override will remain in place.
Temperature override limitation
This allows the installer to limit or lock the keyboard to
prevent unauthorised changes to programme values
and limits overrides.
Keyboard lock
If batteries are not changed within 15 days of a low
battery warning, the unit shuts down. In normal
circumstances the thermostat turns off the valve or the
boiler it is controlling. In extreme climates turning off the
heating is likely to result in the building freezing up. To
prevent this, the installer can set up the unit to turn the
heating ON rather than turn OFF on battery failure. This
will consume more fuel but will prevent damage occurring
to the building. If appropriate please check that the
installer has set this function correctly.
Please note: If you replace the batteries and the LCD
does not come on immediately please check battery
orientation. Do not leave batteries in the product if
the display is not active.
If, after changing the batteries, the screen remains
blank it is necessary to carry out a partial reset. See
below for details.
What happens to the unit when batteries fail
• If the property is owned by a
landlord he may, for gas safety
reasons, have instructed the
installer to set the service interval
timer.
• If set, 28 days prior to the service
due date, a visual and audible
warning will start each day at
noon. The audible warning will
last for 10 seconds and will be
repeated every hour until a button
is pressed to cancel it. If cancelled
the alarm will recommence the
following day at noon.
• If the boiler is not serviced before the due date, a
visual and audible warning will start each day at
noon. The audible warning will last for 1 minute and
will be repeated every hour until a button is pressed
to cancel it. If cancelled the alarm will recommence
the following day at noon.
• In addition, all overrides and programming buttons
will be disabled and the heating may operate for a
limited amount of time each hour.
• The installer may cancel or reset the service interval
timer as part of the boiler service.
• This is a gas safety feature that can only be
accessed by an installer.
Service Interval Timer
Service Interval
Partial reset: Press RESET (used to restart micro-
computer) if display freezes for any reason. This does
not reset any programme, clock or date. It is
recommended that this is done at time of installation.
User full reset: Press RESET whilst holding down PROG
button. This resets event times and any User Advanced
Programme setting, but does not reset time or date.
Installer full reset: This is only available to the
installer. In addition to the above all of the Installer
Advanced Programming settings are returned to
factory settings, however, time, date and service due
date are not reset.
Resetting the unit
Programmable room stat