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Legionella control programming is performed using screen 5 in the setup menu:
To enable the Legionella Control cycle set “Legionella Cycle” to “YES”
The program settings will now be displayed:
Each output can be programmed separately. The program for output 1 is set on the line labelled “OP1”
and output 2 on line “OP2”
Press the setup button briefly to advance to each setting to be adjusted and use the or buttons to
adjust to the required setting.
To disable a programme if control on only one output is needed, set the time to 00:00
The program will commence at the set starting day and time and will continue to heat the water
until the programmed temperature is reached. When the programmed temperature is reached
the cycle will terminate and normal PV optimising will resume.
If the Apollo GEM tank temperature sensor is not used, the temperature set by the electric hot
water thermostat will be used, therefore this should be set to a minimum of 60
o
C.
The legionella cycle will always heat at full power until the required temperature is reached. If
insufficient excess power is available power will be imported to complete the cycle.
To minimise energy costs is it recommended that the cycle is either programmed to start during
off peak tariff times (if you have one) or around midday when PV power is likely to be at its
highest.
GEM Installation Manual
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