1110.2 More Than 110 Pounds of Refrigerant

Systems containing more than 110 pounds (49.9 kg) of refrigerant shall have stop valves installed at the following locations:

1. The suction inlet of a compressor, compressor unit, or condensing unit.
2. The discharge outlet of a compressor, compressor unit, or condensing unit.
3. The inlet of a liquid receiver, except for self-contained systems or where the receiver is an integral part of the condenser or condensing unit.
4. The outlet of a liquid receiver.
5. The inlets and outlets of condensers where more than one condenser is used in parallel in the systems.

Exception: Systems that have a refrigerant pumpout function capable of storing the refrigerant charge, or are equipped with the provisions for pumpout of the refrigerant or self-contained systems. [ASHRAE 15:9.12.5]