Installation Guide for the SolaStat™-Plus-ET
Version 1.2 – July 2011
Page 2
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The SolaStat
TM
-Plus-ET is a solar hot water controller that efficiently
manages your hot water system. It measures water temperatures at three
different places in the system and turns on a water pump at the optimum
time. The pump moves hot water from the solar collector into the hot water
tank. This controller also allows intelligent control heat transfer of excess
stored hot water.
The SolaStat
TM
–Plus-ET has advanced features that protect the system from
damage, run self diagnostics, self correction of some problems. It will also
keep you informed of the measurement and the decisions it is making.
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There are three key things to remember:
1. The solar collector sensor is called ROOF.
2. The upper hot water tank sensor is called TANK.
3. The lower hot water tank sensor is called INLET.
The controller measures the temperature at the ROOF and compares that to
the INLET temperature. If the difference is too great, then, during normal
operation, the pump turns on and transfers heated water from the solar
collector to the tank and replaces this with cooler water from the bottom of
the tank. When the heat difference is reduced to acceptable levels the pump
turns off.
This cycle repeats continuously to heat up the tank.
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