Mitsubishi Electric PAAA18AA1 Installation Manual page 17

WARNING
Refrigerant leak risks
• If refrigerant gas leaks during installation work, ventilate the room and do not use the
furnace until a technician considers that it is safe to use the furnace.
– If the refrigerant gas comes into contact with a flame, poisonous gases will be re-
leased. When the odor is detected, contact a dealer, contractor or technician regard-
ing the appropriate measures to prevent the safety limit from being exceeded.
• After completing installation work, make sure that refrigerant gas is not leaking.
– If the refrigerant gas leaks and is exposed to a fan heater, stove, oven, or another
heat source, it may generate noxious gases.
• Do not use refrigerant other than R410A.
– Doing so may cause the unit or pipes to burst, or result in an explosion during use,
repair, or at the time of disposal of the unit.
– Doing so may also be in violation of applicable laws.
– The manufacturer, Mitsubishi Electric Corporation, its affiliates and suppliers, cannot
be held responsible for malfunctions or accidents resulting from the wrong type of
refrigerant used.
• When the outdoor unit service valve is left closed after installation / service, or when
the outdoor unit service valve is closed due to operation stop, the volume of the liquid
refrigerant in the refrigerant piping expands due to the heating operation in the gas
furnace, causing A-Coil or local extension piping to rupture.
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
17 © 2022 Mitsubishi Electric US, Inc.