Baltimore Aircoil Company ICE CHILLER TSC-C-D, Operating And Maintenance Instructions Manual

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5 Cold Weather Operations
5 Cold Weather Operations
W W W . B A L T I M O R E A I R C O I L . E U
17
COLD WEATHER OPERATIONS
About cold weather operation
BAC equipment can be operated in subfreezing ambient conditions provided the proper measures are taken:
1. Insulation of piping.
2. Protection against coil freezing.
3. Elimination of ice due to sub-freezing ambient.
Listed below are general guidelines which should be followed to minimize the possibility of freeze-up. As these
guidelines may not include all aspects of the anticipated operation scheme, system designer and operator must
thoroughly review the system, location of the equipment, controls and accessories to ensure reliable operation at
all times.
Insulation of piping
Precautions must be taken to protect the associated piping from freezing conditions. Heat tracing and insulation
should be installed on all piping connected to the unit to prevent cracking.
Protection against coil freezing
When operated with a fluid as heat transfer medium, TSU Ice Thermal Storage coil(s) must be protected from
damage by freezing of the fluid inside the coil(s) when in operation. Freeze protection must be obtained by the use
of ethylene or propylene glycol or other anti-freeze solutions in appropriate concentrations.
TSU Ice Thermal Storage units typically use a 25% (by weight) solution of industrially inhibited ethylene glycol for
both corrosion and freeze protection. The systems lowest operating temperature should be at least 3°C to 4°C
above the anti-freeze solution freeze point. Uninhibited ethylene glycol and automotive antifreeze solutions are
NOT to be used in TSU Ice Thermal Storage coil(s).
The table below indicates the freeze protection range for various ethylene glycol concentrations (% by volume).
% Ethylene Freeze protection
20% -10°C
30% -16°C
40% -25°C
50% -39°C
Freeze protection of ethylene glycol solutions
TSC-C-D
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