Baltimore Aircoil Company ICE CHILLER TSU-M, Operating And Maintenance Instructions Manual

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On multiple unit installations, once the initial ice build cycle has been completed, check all the sight tubes to verify
the water levels in each tank are equal. If the inventories are significantly out of balance, the flow rates of the
glycol solution to each of the thermal storage units should be checked and balanced. Then, after the next ice build
cycle, check the sight tubes once again to ensure balance has been achieved
Daily Operating Guidelines
BUILD CYCLE
For the most energy-efficient operation of the system, the controls should be designed to operate the build cycle as
follows:
Once the ice build cycle has been initiated, the glycol chiller(s) should run at full capacity without cycling or
unloading until the storage device is fully charged (recharged). At that point, the chiller and the glycol circulating
pump should be turned off and not allowed to restart until the discharge (cooling) cycle is initiated. Additionally, a
build cycle should not be re-initiated until approximately 15% of the ice has been melted.
DISCHARGE (COOLING) CYCLE
Ice Chiller
®
Thermal Storage Units can be discharged in a variety of ways depending upon the system
configuration and objectives of the system designer. Consult the project drawings and specifications for direction
on how the system is to operate during the discharge (cooling) cycle.
It is recommended to completely melt-out the ice during each cooling cycle by pumping the warm glycol solution
through the coils. If complete melt-out cannot be accomplished, try to melt out as much ice as possible.
CAUTION
Unmelted ice is wasted energy.
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 23
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.
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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