Test Mode And Emergency Mode - Mitsubishi Electric PAA-A18AA1 Service Manual

8. 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 technician 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.
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: Turn the power to the system 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 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.
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
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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