Seasonal Shutdown
ICE CHILLER® Thermal Storage Units installed indoors in a heated space (or outdoors where subfreezing
temperatures do not occur) do not require special attention or preparation for a seasonal or winter shutdown.
However, if subfreezing conditions do occur, please refer to section "About Cold Weather Operation" on page 21
ICE LOGIC
TM
Ice Quantity Controller
ANALOGUE ICE THICKNESS TRANSMITTER AITT-420-R (RADAR TYPE SENSOR)
When ice is build in the TSU the water level will increase in the tank. The water level rise is proportional to the % of
ice present in the tank. The new radar type Ice Logic measures the water level by the principle of guided wave
radar. It measures the level using electromagnetic pulses. The pulses are transmitted by the sensor head and
guided along a rod. When they hit the medium to be detected (in our case water), they are reflected and guided
back to the sensor. The time between transmitting and receiving the pulse directly relates to the travelled distance
and the current level.
The sensor has no moving parts, is not sensitive to pollution and is independent of the fluid properties.
Prior to setting the controller, make sure the ice tank is filled with water and the radar type sensor in connected to
the control box according to the wiring diagram below and the 230V supply voltage is present. The zero level
markings on the sensor should correspond with the zero level (water without ice) in the tank.
When properly set, the control box will provide a passive 4-20 mA output signal where 0 mA stands for 0% ice and
20mA corresponds with 100% ice (full ice build).
W W W . B A L T I M O R E A I R C O I L . E U
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