User Instructions for GECO GH21RA controller
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Page 24 Edition I
19.06.2013
7.6.
Boiler extinguished detection
7.6.1
Out of fuel
If, during automatic mode, the temperature of water from the boiler does not reach that set
in parameter S08 for the duration set in S09, the controller records that the boiler has gone
out and returns alarm AL13.
7.6.2
Sharp decline in temperature of water leaving the boiler
When in automatic mode the temperature of water leaving the boiler is lower than 10 C
and in a short time does not increase by 4 C, the CH pump and hot water pumps are turned off
and the controller enters boiler extinguished detection mode.
The controller waits for the time set in parameter S10, to check whether there is an
increase of 4 C.
o
When this temperature rise DOES occur, detection mode ends, and the heating and hot
water pumps are connected.
o
When this DOES NOT occur, this means that that fuel has gone out and the controller
returns alarm AL13.
7.7.
Anti-Stop function
The GH21RA controller includes an anti-stop option, a security measure which guards
against system deterioration during the summer months. The function turns on the device for
a few minutes every seven days, to ensure performance throughout the year.
There are three settings for this function:
• Standard – all devices in the system, except for the feeder tray
• Complete – all devices in the system
• Inactive – function inactive
The anti-stop function can only be activated in manual mode. When this function is active,
the user cannot control devices connected to the system. Manual control of external devices is
only possible when this function is turned off.
7.8.
Grate mode
The GH21RA controller allows the heating regulation algorithm to be changed to ‘grate
mode’, which does not support the feeder tray. It is usually used when the type of fuel is being
changed, for example to wood or green waste paper. The controller operates the boiler, fan
and pumps as normal. When this mode is activated the main screen shows the text ‘grate
mode H’ or ‘grate-mode M’ in heating mode.