Explanation of the HWC 4 Adjustment Values Cont.
Reheat Lower Adjustment Value.
The Reheat Lower makes sure the user doesn’t run out of hot water. This is measured with the Tank
Sensor.
When the Tank falls to the coldest you want the water to get, called ‘Reheat Lower’ (Adjustable from
1~70C), Holdoff Timer is overridden and the electric element turns ON. The temperatures selected will
depend on user preferences, tank size, electric element size etc.
The Reheat Lower is OFF below 1C or if Holdoff Timer = ‘thr’.
Reheat Upper Adjustment Value.
The Reheat Upper (Adjustable from 2~90C), turns the electric element OFF after Reheat Lower has turned
it on. This is measured with the Tank Sensor.
The Reheat Upper acts as a Thermostat for the Tank when Holdoff Timer has timed out and BioSafe is not
active. Refer ‘Example of Holdoff, Reheat and BioSafe Mode’.
The Reheat Upper is the temperature for the HWC override.
The Reheat Upper is OFF if Holdoff Timer = OFF and Reheat Lower = OFF.
BioSafe Adjustment Value.
This is safeguard against tepid water creating a health hazard*.
The SolaStat-Plus monitors the water temperature in the hot water tank. BioSafe must always be enabled
for Potable water installations.
If the water does not reach a preset temperature called ‘BioSafe’ (Adjustable from 50~70C) within 24 hours
at the ‘Tank’ sensor all other functions are overridden, the HWC light will flash fast and the electric element
turns ON and heats the water to a safe level. 24 hour timer is approximate only. Biosafe is OFF below 50C.
BioSafe Disclaimer
ICM Ltd makes the following observations about the BioSafe mode and bacteria in tepid water based on
published scientific articles and laws passed in some countries. ICM Ltd in no way claims this information is
a guarantee for safe practices or that the recommendations will prevent any or all forms of tepid water
infection. Neither do these recommendations extend to other parts of the plumbing other than the hot water
tank. It is recommended the entire hot water tank is heated from top to bottom to ensure no water remains
at a tepid temperature. This may be achieved by such means as a de-stratification pump.
* Dangerous organisms can multiply in tepid water (especially 30 to 45ºC) and when aerosoled (e.g. in a
shower) can cause pneumonia type symptoms.
If the water is raised to 50ºC all growth stops, when the water is above 55ºC the organisms start dying and
at 60ºC they die very quickly. Other factors will influence the level of growth or decimation. Copper pipes
and tanks help kill these organisms, as will stainless steel (to a lesser extent) and water flow will keep the
numbers down but sludge and rust deposits will enhance growth.
It is therefore prudent to ensure that any domestic hot water system storage tank is hotter than 60ºC top to
bottom at least once a day especially when the electric element is controlled. This is in line with regulations
in some countries and the strong recommendation of ICM Ltd. As such our BioSafe function will make sure
the tank is completely heated once a day to the Adjustable BioSafe Value (ICM recommends 60C), either
by Solar Hot Water or by the electric element. This BioSafe temperature is adjustable only to allow for
sensor interface errors or an even hotter target temperature for greater caution.
19.01-15
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