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// CODE SNIPPET

1112.4 Evaporators

California Mechanical Code 2019 > 11 Refrigeration > 1112.0 Pressure-Relief Devices > 1112.4 Evaporators
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Heat exchanger coils located downstream, or upstream within 18 inches (457 mm), of a heating source and capable of being isolated shall be fitted with a pressure-relief device that discharges to another part of the system in accordance with Section 1112.5 through Section 1112.5.2 or outside any enclosed space in accordance with Section 1112.10. The pressure relief device shall be connected at the highest possible location of the heat exchanger or piping between the heat exchanger and its manual isolation valves.

Exceptions:
  1. Relief valves shall not be required on heat exchanger coils that have a design pressure more than 110 percent of refrigerant saturation pressure when exposed to the maximum heating source temperature.
  2. A relief valve shall not be required on self-contained or unit systems where the volume of the lowside of the system, which is shut off by valves, is more than the specific volume of the refrigerant at critical conditions of temperature and pressure, as determined in accordance with Equation 1112.4.
V1/[W1 - (V2 - V1)/ Vgt]
Shall be more than Vgc (Equation 1112.4)

Where:

V1 = Lowside volume, cubic foot (m3).
V2 = Total volume of system, cubic foot (m3).
W1 = Total weight of refrigerant in system, pounds (kg).
Vgt = Specific volume of refrigerant vapor at 110°F (43°C), cubic feet per pound (m3/kg).
Vgc = Specific volume at critical temperature and pressure, cubic feet per pound (m3/kg). [ASHRAE 15:9.4.4]

Related Code Sections


1112.4 Refrigeration, Evaporators
Evaporators located downstream, or upstream within 18 inches (457 mm), of a heating coil shall be fitted with a pressure-relief device discharging ...
California Mechanical Code 2016 > 11 Refrigeration > 1112.0 Pressure-Relief Devices > 1112.4 Evaporators
1112.4 Refrigeration, Evaporators
Heat exchanger coils located downstream, or upstream within 18 inches (457 mm), of a heating source and capable of being isolated shall be fitted ...
California Mechanical Code 2019 > 11 Refrigeration > 1112.0 Pressure-Relief Devices > 1112.4 Evaporators
933.0 Installation of Specific Appliances, Evaporative Cooling Systems
Evaporative cooling systems, including air ducts and fire dampers that are a portion of an evaporative cooling system, shall be in accordance ...
California Mechanical Code 2019 > 9 Installation of Specific Appliances > 933.0 Evaporative Cooling Systems
934.0 Installation of Specific Appliances, Evaporative Cooling Systems
Evaporative cooling systems, including air ducts and fire dampers that are a portion of an evaporative cooling system, shall be in accordance ...
California Mechanical Code 2016 > 9 Installation of Specific Appliances > 934.0 Evaporative Cooling Systems
405.0 Ventilation Air, Evaporative Cooling System for Health Care Facilities
[For OSHPD 1, 1R, 2, 3, 4 & 5] Direct evaporative cooling systems where the air directly contacts the wetted surface or spray shall be limited ...
California Mechanical Code 2019 > 4 Ventilation Air > 405.0 Evaporative Cooling System for Health Care Facilities
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