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IM 474-3
discourage this practice. Instead, we recommend that the LWC be given a separate, dedicated
connection to the BAS. The reason is that the BAS must coordinate loop water alarm control for the
heat pumps regardless of how the LWC is connected. By providing a separate connection to the BAS,
the response time can be speeded up significantly, reducing the risk of heat pump alarms, mechanical
safety trips, or even equipment damage.
For example, if the loop pumps fail, the LWC will generate an alarm. The BAS must immediately
detect this alarm and then send out a command to stop all heat pump compressors.
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