User Instructions
Page 5
Cylinder Digital Stat
Grant Hot Water Boost Kit
In addition to the programmer and cylinder thermostat, to control the ON and
OFF times of the water heating, you may also have a Grant Automatic DHW
Boost Kit 2 control fi tted.
This optional control allows the cylinder immersion heater to periodically
raise the water temperature in the cylinder to 60°C to prevent Legionella. It
incorporates a timer allowing it to be pre-set to automatically operate the
immersion heater for the required period on either a daily or weekly basis.
Refer to the Installation and User Instructions supplied with the Boost Kit for
further information.
If fi tted, the Boost Kit timer should have been set by the installer to suit your
installation when your heat pump was commissioned. Refer to Section 5.4 of
the Installation Instructions supplied with your Aerona³ heat pump for further
details if required.
NOTE
When setting the stat please set no higher than
47°C for most effi cient running of domestic hot
water
NOTE
The Immersion heater switch or switched
isolator usually located on the wall next to
your hot water cylinder, MUST be switched ON
for the Boost Kit to automatically operate the
immersion heater.
WARNING
WARNING
If either the Immersion heater switch (on the
wall), or the timer override, is set to OFF the
anti-legionella function will not operate.
Do not set above 53°C at any stage without
consulting Grant Engineering as it will affect
your heating system
