Mitsubishi Electric PAAA18AA1 Installation Manual page 89

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 thermostat
• ON (default): Power from the furnace is supplied to the NAT.
• OFF: Power supply from the furnace to the NAT is disconnected.
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.
WARNING
If set to ON, the furnace will start heating immedi-
ately 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. Converse-
ly, when powering down the system, the furnace
should be powered down prior to powering down
the outdoor unit. If operated improperly, it may re-
sult 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.
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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