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L 503.4.4 Heat Recovery for Service Water Heating
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Condenser heat recovery systems shall be installed for heating or preheating of service hot water provided the following are true:
- The facility operates 24 hours a day.
- The total installed heat rejection capacity of the water-cooled systems exceeds 6 000 000 Btu/h (1758 kW) of heat rejection.
- The design service water-heating load exceeds 1 000 000 Btu/h (293 kW). [ASHRAE 90.1:188.8.131.52.1]