SolaSmart™ Plus Installation Guide
Version 1.1 – Mar 2012 Page 16
ABOUT THE PUMP SETTINGS
Introduction
The SolaSmart™ works by turning the pump on when the difference between
the temperature at the solar hot water collector (ROOF) and the INLET is at a
high level (i.e. the temperature at the solar hot water Collector is significantly
higher than the temperature at the bottom of the tank (INLET).
The pump turns off again when the difference is lower (i.e. the water in the
tank has been heated up).
For example, using the standard settings:
PUMP ON = 12°C and PUMP OFF = 6°C:
When the solar hot water collector (ROOF) water temperature is 12°C higher
than the INLET, the pump turns on. This transfers hot water from the
collector to the tank, and transfers cooler water from the bottom of the tank to
the collector.
This makes the temperature in the Tank heat up; and the temperature in the
collector on the ROOF cool down.
When the difference in the two temperatures reduces to 6°C, the pump
switches off, allowing the water in the collector to heat up again.
FROST
Function
The FROST function is designed to protect your collector and hot water
system from freezing and bursting. When this temperature is reached, the
pump will come on just enough to raise the temperature of water by 2-3°C
Only a small amount of warm water is needed to protect the collector and
plumbing.
When the unit is in Frost Mode, the PUMP light will come on.
PWM Pump
Function
The PWM output is a signal that can communicate with an intelligent variable
speed pump such as the Grundfos Solar PM 15-85. This is a signal only and
not a power source.
A PWM pump uses less electricity to pump the same amount of water as a
standard induction pump and will harvest solar energy more efficiently with
the SolaSmart controller using a control method that self adjusts to maximum
energy transfer.
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