Service Interval Feature Expalined
The Service Interval (Si)
feature on a programmable room thermostat is designed to help
landlords comply with current gas regulations. When activated, the
Si feature will give a warning message to the
householder that their boiler is due to be serviced. If the boiler
has not been service by the Service Due date then
the programmable room thermostat will enter
"Setback" mode. The Setback mode
forces the set temperature of the programmable room thermostat to a
fixed, lower than normal temperature (usually around 14°C), meaning
that the building is uncomfortable for the occupants but is
protected from extremely low temperatures. When the boiler has been
serviced the Service Engineer will normally reset the
Si feature, meaning the unit will return to normal
operation until the next service is due.
When resetting or activating the Si feature the service engineer
will be prompted to enter two numbers. The first number is
the number of days before the Service Due date
that the landlord wishes the service due warning message ("Ser") to
be displayed on the screen of the unit. In the case of the
SunStat
Si & SunStatRF
Si this number is between 30 and 60 days. The
second number the service engineer will then be prompted to enter
is the number of days (between 0 and 365 days) until the next
service is due.
The SunStatRF
Si & SunStat
Si are supplied with this feature disabled and must be
selected by the installer. Once selected this feature cannot be
disabled by the householder unless they have access to a hidden key
sequence.