SolaStat™-1-3 Installation Guide
Version 1.1 – April 2013 Page 16
ABOUT THE PUMP SETTINGS
Introduction
The SolaStat™ works by turning the pump when the difference between the
temperature at the solar hot water Collector (ROOF) and the temperature in
the TANK, is at a certain level.
The pump turns on when the difference between these two temperatures is
high (i.e. the temperature at the solar hot water Collector is significantly
higher than the temperature at the tank sensor (TANK).
The pump turns off again when the difference gets less (i.e. the water in the
tank has been heated up.
For example, using the standard settings:
PUMP ON = 12°C [21°F] and PUMP OFF = 6°C [10°F]:
When the solar hot water collector (ROOF) water temperature is 12°C
[21°F] higher than the TANK, 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 [10°F[, the
pump switches off, allowing the water in the collector to heat up again.
About the
setting
For standard domestic hot water systems, the recommended settings are
relatively large (e.g. PUMP ON = 12°C [21°F] and PUMP OFF = 6°C [10°F].
This causes the pump to transfer hotter water over shorter periods of time.
For lower temperature systems (like swimming pools or under-floor
heating), these temperatures settings should be set lower (e.g. PUMP ON =
5°C [9°F] and PUMP OFF = 2°C [3°F].
This causes the pump to transfer more water at lower temperatures.
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