User Instructions for GECO GH21TA controller
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Page 20 Edition I
19.06.2013
Display selection –
The user can set a
personal profile screen, and customise the type of
information that will be shown. The settings menu offers several choices, with ‘standard’ set by
default.
7.
Description of additional functions
7.1.
DHW priority (hot water)
The GH21TA controller can be set to pump hot water as a priority. If you select this mode,
water heating becomes the primary function of the controller, with heating (CH) secondary.
This is only available in the second configuration. To enable this function, set the value to
"yes" in the menu
.
To enable this function, set the value to ‘
YES
’ in the main menu.
7.2.
Summer function
The GH21TA controller is equipped with a summer mode, which can be used in the
summer to turn off the CH pump so that the boiler only heats water. For this function to work,
a system installation supporting a DHW pump must be selected. This is only available in the
second configuration.
To enable this function, set the value to ‘
YES
’ in the main menu.
7.3.
Anti-legionella function
The controller is equipped with an Anti-legionella function, aimed at limiting the growth of
bacteria of the genus legionella pneumophila in the hot water.
Legionella bacteria develop in aqueous environments, and the optimum temperature for
their growth is from 38-42 C. These bacteria also contribute to blockages in hot water
systems, hot water heaters and tanks. Legionella bacteria cause a non-specific variant of
pneumonia known as Legionnaires' disease, or legionellosis. Legionellosis has been officially
recognised by the Ministry of Health as an infectious disease.
The anti-legionella function performed by the GH21TA controller aims to ensure that the
hot water tank is not a favourable environment for legionella bacteria.
To activate the function, set the value to ‘yes’ in the menu.
