Mitsubishi Electric PAA-A18AA1 Service Manual page 33

Relay board SW01 DIP switch
settings
SW01
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
SW01-1 Power to non-
adjustable thermostat
• ON (default): Power
from the furnace is
supplied to the NAT.
• OFF: Power supply
from the furnace to the
NAT is disconnected.
WARNING
If SW01-2 and SW01-4 is set to ON, the
furnace will start heating immediately upon
a loss of power to the outdoor unit.
Therefore, during gas furnace test
operation or maintenance, be sure to
power up the outdoor unit prior to
powering up the furnace. Conversely,
when powering down the system, the
furnace should be powered down prior
to powering down the outdoor unit. If
operated improperly, it may result in gas
leakage/poisoning, fire or explosion due to
unexpected gas furnace operation.
SW01-3 W2 initial state
in Test mode
• ON: W2 is initially
switched on when
entering Test mode.
• OFF (default): W2 is
initially switched off
when entering Test
mode.
NOTE
To enable W2, W1 must be ON.
Otherwise, W2 will not operate.
33
SW01-2 W1 initial state
in Test mode
• ON: W1 is initially
switched on when
entering Test mode.
• OFF (default): W1 is
initially switched off
when entering Test
mode.
SW01-4 Mode operation
• ON: Test mode
operation, which is
controlled by push
buttons on the PAA
unit control box user
interface.
• OFF (default):
Emergency mode
operation, which is
controlled by the NAT.
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