Mitsubishi Electric PAA-A18AA1 Manual De Mantenimiento página 34

9. Test mode and emergency mode
Using DIP switch SW01 settings on the relay board, you can select one of two modes—Test or Emergency
—to operate in.
If DIP switch SW01-4 is set to ON, the PAA unit enters Test mode. While in Test mode, the installer can
use the push buttons on the control box user interface to set W1 and W2 to ON or OFF. See the "Control
box user interface" image below.
WARNING
To ensure proper and safe operation of the unit, do not leave the home while the Test
mode is running. Otherwise, results such as electric shock, fire or explosion may occur.
You can configure the initial (ON or OFF) state of the Test W1 and W2 heat signals in Test mode. Setting
DIP switch SW01-2 to ON turns the Test W1 signal ON immediately once the furnace is powered on.
Otherwise, the Test W1 signal will be OFF.
Setting DIP switch SW01-3 to ON turns the Test W2 signal ON immediately once the furnace is powered
on. Otherwise, the Test W2 signal will be OFF.
Steps to check the furnace operation in Test mode:
Step 1: Power off system if not already off.
Step 2: Wait for 3 minutes; this ensures that
the unit is completely powered down.
Step 3: Set SW01-4 to ON for Test mode.
Step 4: Turn the furnace breaker ON. Ensure
that the outdoor unit system breaker is OFF.
You are now in Test mode. Verify the Test
mode indicator (red color) on the control box
user interface is ON.
NOTE
• The PAA unit system enters emergency mode if power is still applied to the furnace and
(a) the outdoor unit loses power or (b) there is an error state that does not allow full
system control. The PAA unit remains in emergency mode until power is restored to the
outdoor unit or the error is resolved.
• If DIP switch SW01-4 is set to OFF, the NAT connected to the PAA unit control box
controls the heat applied to the furnace during an emergency mode failover.
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 and all-
Step 5: Press W1 ON on the control box user
interface to turn on the first stage of furnace heat.
Verify that the furnace fan turns on along with
furnace heat.
Step 6: Press W2 ON on the control box user
interface to turn on the second stage of furnace heat.
Verify that the furnace output increases. This is only
applicable for furnaces with two stages. Single-stage
furnace shows no difference.
Step 7: Power down the furnace.
Step 8: Set SW01-4 to OFF to disable Test mode.
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