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Chapter 11: Refrigeration
Section MC 1101: General
Section MC 1102: System Requirements
Section MC 1103: Refrigeration System Classification
Section MC 1104: System Application Requirements
Section MC 1105: Machinery Room, General Requirements
1105.1 Design and construction.
1105.2 Openings.
1105.3 Refrigerant detector.
1105.4 Tests.
1105.5 Fuel-burning appliances.
1105.6 Ventilation.
1105.6.1 Discharge location.
1105.6.2 Makeup air.
1105.6.3 Ventilation rate.
1105.6.3.1 Quantity-normal ventilation.
1105.6.3.2 Quantity-emergency conditions.
1105.7 Termination of relief devices.
1105.7.1 Discharge of Group A2, B2, A3 and B3 refrigerants.
1105.7.2 Certificate of qualification.
1105.8 Ammonia discharge.
1105.9 Emergency pressure control system.
1105.9.1 Automatic crossover valves.
1105.9.1.1 Overpressure limit setpoint.
1105.9.1.2 Manual operation.
1105.9.1.3 System design pressure.
1105.9.2 Automatic emergency stop.
1105.9.2.1 Automatic crossover valves.
1105.9.2.2 Overpressure in low-pressure zone.
1105.10 Remote control.
1105.11 Emergency signs.
1105.12 Storing refrigerant.
Section MC 1106: Machinery Room, Special Requirements
Section MC 1107: Refrigerant Piping
Section MC 1108: Field Test
Section MC 1109: Periodic Testing
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1104.4.2 Communicating spaces.
Where an evaporator or condenser is located in an air duct system, the volume of the smallest, enclosed occupied space served by the duct system shall be used to determine the maximum allowable quantity of refrigerant in the system.
   Exception: If airflow to any enclosed space cannot be reduced below one-quarter of its maximum, the entire space served by the air duct system shall be used to determine the maximum allowable quantity of refrigerant in the system.
1104.4.3 Plenums.
Where the space above a suspended ceiling is continuous and part of the supply or return air plenum system, this space shall be included in calculating the volume of the enclosed space.
Section MC 1105: Machinery Room, General Requirements
1105.1 Design and construction.
Machinery rooms shall be designed and constructed in accordance with the New York City Building Code and this section.
1105.2 Openings.
Ducts and air handlers in the machinery room that operate at a lower pressure than the room shall be sealed to prevent any refrigerant leakage from entering the airstream.

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