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A condensate switch is another essential component to a properly
functioning HVAC system
5
IMC 307.2.3 Auxiliary and secondary drain systems
In addition to the requirements of Section 307.2.1, where damage
to any building components could occur as a result of overflow from
the equipment primary condensate removal system, one of the
following auxiliary protection methods shall be provided for each
cooling coil, or fuel-fired, appliance that produces condensate:
1. An Auxiliary Drain Pan (Secondary/Overflow) with a separate Drain
Line
shall be provided under the coils on which condensation will occur....
2. A separate Overflow Drain Line shall be connected to the drain pan
provided with the equipment
(Primary Drain Pan)
3. An Auxiliary Drain Pan without a separate drain line shall be provided
under the coils on which condensate will occur. Such pan shall be
equipped with a water level detection device (added ‘06) conforming to
UL508 that will shut off the equipment served prior to overflow of the
pan.
Required by the
International Mechanical Code