User Instructions for GECO GH21TA controller
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Page 29 Edition I
19.06.2013
9.4
Automatic mode – DHW/Mixer pump
The DHW pump is activated when the temperature of water from the boiler is higher than
40
0
C and higher than the temperature of the water in the boiler (so as not to cool the water in
the boiler), and lower than the temperature set by the user in the parameter ‘set DHW
temperature’. When the DHW pump is connected and operating, this is indicated by a DHW
pump icon in the negated backlit position in system operation preview
. When the pump
is disabled, this is indicated by a DHW pump icon, without negated backlight in the system
operation preview
.
9.5
Maintain mode – fan and feeder
The controller enters this mode, if the temperature of the boiler reaches the value set by
the user in the parameter ‘set boiler temperature’. The fuel feeder and fan are disabled in this
mode, for the time set by the user in the parameter ‘maintain time’. After this time, the
controller turns on the fan and feeder for the time set by the manufacturer in parameter S20.
The fan will operate for longer than the time set for the fuel feeder in parameter 18, in
order to light the fuel. The controller exits ‘maintain mode’ and returns to ‘heat mode’, if the
boiler temperature drops to a value equal to ‘set boiler temperature’ - boiler hysteresis. The
CH pump works the same as in the heating mode.
