Heat Pump Operation Logic; Adjusting The Set Point Temperature - ITS Telecom ITS-3HD Product Manual

ITS Heat Pumps
Domestic Heat Pump Product Manual

7.2 HEAT PUMP OPERATION LOGIC

The "IN" temperature as displayed on the controller display is the temperature as measure by a
heat pump sensor installed in the bottom of your geyser. The controller has been programmed to
start heating the water in the geyser as soon as the "IN" temperature falls below 50°C. The heat
pump will then heat the water till the "IN" temperature reaches 53°C and automatically switch
off the heating process. Only once the water in the bottom of the geyser has again cooled down
to below 50°C will the heat pump start heating again.
Please note that due to the patented loading valve technique used on ITS heat pumps the upper
section of the geyser will already be at 60°C when the bottom of the geyser reaches 53°C.
The heat pump geyser temperature sensor is mounted in the bottom of the geyser (geyser
thermostat pocket) which is close to where the cold water inlet of the geyser is. This is ideal
since it enables to the heat pump to quickly detect when water is being used and start the
heating process.
Please note that because the geyser temperature sensor is situated close to the cold water inlet
port of the geyser it will not give an accurate temperature reading of the water at the hot outlet
of the geyser. The sensor might be reading only 20°C but the water available from the taps could
still be close to 60°C.
The following points describe in more detail the heating process:
When the "IN" temperature fall below 50°C the controller will activate the internal fan
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and water circulation pump.
After about 1 minute the compressor will start and the unit will start to generate heat.
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The heat pump will first re-circulate water through itself via the loading valve till the
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outlet water is more or less 50°C. At this stage the loading valve will start to open and
the hot water will start to move towards the geyser.
Since the heat pump is loading the geyser with hot water from the top it is normal for the
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"IN" temperature display to take long before showing any increase in temperature. This
does however not imply there is no hot water available. The ITS loading technique is
ensuring that hot water will be available within minutes from switching on.
During certain operating conditions the heat pump might switch off the fan and only let
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the compressor work.
When the "IN" temperature reaches the set point temperature (53°C) the heat pump will
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first switch off the internal compressor. The fan will run for another 30 seconds and the
circulation pump for another 60 seconds.

7.3 ADJUSTING THE SET POINT TEMPERATURE

The installer will set the set-point temperature to 53°C. As stated before, a set-point of 53°C will
result in an outlet water temperature of about 60°C. Under no circumstances should the set-
point be set higher than 53°C as this will drastically increase the chance for an EE1 error in
future and it also reduce the electrical saving you will make. The set-point may be reduced
should you find that the water is warmer than needed. Reducing the set-point temperature will
improve the electrical saving. To change the set point temperature:
Press the up arrow twice (display will show parameter "1" and the current set point
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temperature).
Press "SET" - Temperature Flashes on right hand side.
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Adjust temperature to desired degree using up/down arrow.
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SETTING THE TIME
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