19.01-14
Examples and Explanation of the HWC 4 Modes of Operation.
Example of Holdoff, Reheat and BioSafe Mode.
Holdoff Timer = 4 hours. Reheat Lower = 40C. Reheat Upper = 55C. BioSafe = 60C.
The BioSafe ensures the Tank reaches 60C approximately every 24 hours either from Solar Hot Water or
from the electric element turning ON.
From the
last pump operation, the electric element will be OFF for approximately 4 hours (each time the
pump operates the Holdoff Timer Resets to 0 hours and starts counting up to 4 hours), unless the Tank falls
to 40C and then the electric element turns ON. When the Tank reaches 55C the electric element turns OFF.
After 4 hours has elapsed from the
last pump operation, the Reheat Upper acts as a Thermostat for the
Tank. When the Tank reaches 55C the electric element turns OFF and when the Tank falls to 50C the
electric element turns ON. (Note this function has a 5C Hysteresis similar to an Electromechanical
Thermostat.)
Example of Thermostat and BioSafe Mode.
Holdoff Timer = thr. Reheat Lower = OFF. Reheat Upper = 55C. BioSafe = 60C.
The BioSafe ensures the Tank reaches 60C approximately every 24 hours either from Solar Hot Water or
from the electric element turning ON.
When the Tank reaches 55C the electric element turns OFF and when the Tank falls to 50C the electric
element turns ON. (Note this function has a 5C Hysteresis similar to an Electromechanical Thermostat.)
Example of Reheat and BioSafe Mode.
Holdoff Timer = OFF. Reheat Lower = 40C. Reheat Upper = 55C. BioSafe = 60C.
The BioSafe ensures the Tank reaches 60C approximately every 24 hours either from Solar Hot Water or
from the electric element turning ON.
When the Tank falls to 40C the electric element turns ON. When the Tank reaches 55C the electric element
turns OFF.
Example of BioSafe Mode.
Holdoff Timer = OFF. Reheat Lower = OFF. Reheat Upper = OFF. BioSafe = 60C.
The BioSafe ensures the Tank reaches 60C approximately every 24 hours either from Solar Hot Water or
the electric element turning ON.
Explanation of the HWC 4 Adjustment Values.
There are 4 adjustable values that are used to give us a wide range of options and intelligent control.
Holdoff Timer Adjustment Value.
Simulates a smart 24 hour timer. Needs no human intervention for long term accuracy or to adjust to
changing conditions. Timer is approximate only.
From the
last pump operation, a programmed period of time called ‘Holdoff Timer’ (Adjustable from 1 to 23
hours), must elapse before the element can turn ON. This stops the HWC electric element coming on when
solar heated water is being pumped into the tank during the day. Refer ‘Example of Holdoff, Reheat and
BioSafe Mode’.
Below 1 hour the SolaStat-Plus operates in Thermostat Mode, (‘thr’ on display.)
Above 23 hours the SolaStat-Plus operates in Reheat Mode, (‘OFF’ on display.)
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