X. Heat Exchanger Features
City Water Backup
Purpose: The heat exchanger is designed to provide emergency backup cooling to the MRI magnet’s
helium compressor.
Method: A solenoid valve at the city water inlet opens, and city water is passed directly to the helium
compressor, then back to the heat exchanger’s tank, then out to drain through the overflow drain
line.
Operation: City water backup automatically activates on any fault condition, on loss of power, and
when the unit is switched OFF. If manual operation is preferred, implement a manual ball valve in the
external piping at the city water inlet. Leave the manual valve closed during normal operation, and
open the manual valve when city water backup is required.
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