Cold Weather Operations; About Cold Weather Operation; Protection Against Sump Water Freezing; Capacity Control - BAC VCL Operating And Maintenance Instructions Manual

VCL
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COLD WEATHER OPERATIONS

About Cold Weather Operation

BAC equipment can be operated in subfreezing ambient conditions provided the proper measures are taken:
1. Protection against sump water freezing, when the system is idle.
2. Capacity control to prevent ice formation during operation.
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.

Protection Against Sump Water Freezing

To prevent sump water from freezing, either sump heaters or a remote sump located in a heated indoor area must
be installed. For a seasonal shut down during the cold weather period, it is recommended to drain the sump.
Drainage of the sump will also be needed if dry operation is anticipated, even if sump heaters are installed. These
heaters will NOT prevent sump water from freezing during dry operation at sub freezing ambient conditions.
Remote sump installations are best suited for a flexible switch from wet to dry operation, as the sump water is
protected at all times. For dry operation applications, ensure that make-up water line is shut off and make-up valve
completely drained.
Thermostats for electrical sump heaters for this equipment are set to maintain a sump water temperature of 4°C.

Capacity Control

In addition to protecting the sump water, all exposed water piping, in particular make-up water lines should be heat
traced and insulated.
Spray pumps also need to be heat traced and insulated from pump suction to the overflow level, if they can be
exposed to sub-freezing ambient conditions.
4 Cold Weather Operations
4 Cold Weather Operations
Caution
SWITCH OF HEATERS WHEN THE SUMP IS DRAINED.
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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