User Guide

28
Operation InstructionsAppendix B
Standby
(No heating)
Melting
(Heating)
Post-heating
(Heating)
Measuring
temperature
(No heating)
Temperature < Melting temperature and Moisture > Moisture limit Moisture < Moisture limit
After 3 hours 0-20 minutes Post-heating time elapsed
Temperature > Melting temperature
B: How it works Roof system The roof system is fully automated. It gathers information on moisture and temperature via digital sensors continuously. The sensors are placed on strategic spots in gutters or down pipes (for further information on the sensor please refer to the sensor manual). By combining measure- ments of both moisture and tem- perature a reliable detection of the situation is achieved. Hence it is known whether heating is required to prevent ice and snow from covering the roof area. Standby The system is on standby and awaits heating of the roof area. Heating of the roof area will start when the following conditions are fulfi lled: • Measured moisture is higher than the chosen setpoint for moisture. • Measured temperature is lower than the chosen melting temperature. Temperature and moisture are measured continuously by the sensors. Melting ice and snow The roof area is heated in periods of 3 hours. Within that period a decrease in mois- ture will stop the heating and activate post-heating. The post-heating function can be disabled. Measuring temperature The heating function is suspended every third hour meaning that the heating cables are turned off . This is done in order to allow the sensors to measure the temperature, without being infl uenced by the heated cables. The temperature measurement may last up to 20 minutes. If the measured temperature is higher than the chosen melting temperature the heating period is ended; if not, heating of the roof area is resumed after the temperature measurement. Post-heating If the reason for ending a heating period is a decrease of moisture to below the cho- sen level the post-heating period will start. Post-heating ensures that no ice and snow is left on the roof.
Operation Instructions
5
General use The GX™ 850 is operated via 3 buttons and an alpha numeric display capable of display- ing information in various languages. Buttons The functions of the 3 buttons are:
Info Shows additional information / help (only active when lit)
Next Next menu entry / next line / next letter
Enter Confi rm / select
Besides the normal function of the buttons, some special combinations are important to the user: Return to home: Hold for 2 seconds: Return to home of menu system Master reset: Hold for 8 seconds: Restore factory defaults AND delete installed systems. (In case of unsolvable problems due to a wrong choice of language, etc.)
Display The following icons have a special meaning:  This animated icon is shown, when the system is heating.
If icon is blinking the system wants to heat, but is paused (system has low priority)
 This icon is shown, when the system has detected moisture, and the tempera-
ture is above the melting temperature.
 This icon is shown, when the system has detected snow or ice, and the tem-
perature is below the melting temperature.
The GX™ 850 can simultaneously control up to 2 diff erent systems. These 2 systems are referred to as System A and System B. The GX™ 850 gives the user the opportunity to view the current status of the systems. The status can be shown in 2 diff erent ways.
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