Mitsubishi Electric PAA-A18AA1 Manuel D'installation page 81

• On furnaces that only have a W and do not have a W2, connect W1 from the terminal block to the W of
the furnace and make no connection with the W2 signal wire.
• On furnaces that do not have Y, configure for 1‑speed mode and make no connection with the Y/Y2
signal wire. On furnaces that have Y (but not Y2), configure for 1‑speed mode and connect G/Y1 to G of
the furnace and Y/Y2 to Y of the furnace.
• On furnaces that have Y1 and Y2, using the 2-speed mode utilizes two fan speeds while heating or
cooling with the heat pump. These furnaces may also be configured for one fan speed operation, which
turns on only G in Dry mode, lowering the fan speed and removing more humidity in the Dry mode. To
configure in 1-speed mode set mode 23=1 and connect G/Y1 to G of the furnace and Y/Y2 to Y1 and
Y2 of the furnace. To configure in 2-speed mode set mode 23=2 and connect G/Y1 to G and Y1 of the
furnace and Y/Y2 to Y2 of the furnace.
In addition:
• The TH02 and TH05 thermistor wires from the IDU coil must be plugged in to the CN44 connector on the
control board.
• The TH01 thermistor wires must be connected to connections 23A and 24A on the terminal block in the
PAA unit control box.
(See images "Field-installed connectors" and "Terminal block pins (out)" in the "PAA unit control box"
section.)
WARNING
Ensure that you comply with the following requirements. Otherwise, results such as
electric shock, fire or explosion may occur.
• Terminate all unused wires with individual wire nuts to prevent inadvertent short
circuits.
• Do not connect the unused lines together or to anything.
15.6. PAA unit control options
• MA remote controller
• IT terminal connection options
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
81 © 2022 Mitsubishi Electric US, Inc.