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CNT-SVX05A-EN
Troubleshooting
Manual output test can be overridden by the following sequences:
• Power up sequence
• Manufacturing test
• Emergency override
Test sequence
The procedure for testing is:
• Press and hold the Test push button for at least two seconds. The green Status
LED turns off, confirming the Test button has been pressed. The Test push
button is located on the right top board edge of the Tracer
™
AH.540 controller
• Release the Test button to start the manual output test mode. The manual
output test is then in Step 1. The green Status LED blinks in one of two
patterns. If the Status LED blinks once, no diagnostics are present. If the
Status LED blinks twice, diagnostics are present
• Press the Test button (no more than once per second) to advance through
the test sequence
The manual output test can also be controlled over the communications
network using Rover. When conducting the manual output test via the
communications network, the sequence must start with Step 1 (Off), as shown
in Table 53. However, subsequent steps may be conducted in any order.
Table 54 — Manual output test sequence
Note 1:
The following diagnostics cause the Tracer AH.540 to exit manual output test:
• Duct Static Pressure High Limit
• Low Supply Fan Air Flow
• Low Temp Detect
• Unit Shutdown
Note 2:
Upon entering manual output test mode, all outputs are turned off or closed. The Status LED blinks in a one-
blink pattern in the manual output test, or the Status LED blinks in a two-blink pattern if in the manual output test and
a diagnostic is present.
Note 3:
At the beginning of Step 2, the controller attempts to reset all present diagnostics. If the controller is
unsuccessful clearing all diagnostics, the controller exits manual output test.
Note 4:
After the last step, the test sequence performs an exit. This initiates a reset and attempts to return the controller
to normal operation.
Note 5:
If the controller is configured to operate in variable air volume control, the controller runs duct static pressure
(DSP) control during Steps 3-6.
Note 6:
If an exhaust fan status diagnostic occurs, the controller turns off the exhaust fan on this step.
Step (Note 1)
Supply fan
Cool
output
Heat output
Face and
bypass
damper
Outdoor air
damper
Exhaust fan
1:
Off (Note 2)
Off, 0%
Close
Close
Bypass
Close
Off
2: Supply fan on,
slowest speed (Note 3)
Face and bypass full
face
On, 0%
Close
Close
Face
Close
Off
3: Supply fan on, duct
static pressure control
On, DSP
(Note 5)
Close
Close
Face
Close
Off
4: Cool output open
Outdoor air damper
open to occupied
minimum position
On, DSP
(Note 5)
Open
Close
Face
Occupied
minimum
position
Off
5: Heat output open
Face and bypass
full face
Outdoor air damper
open to occupied
minimum position
On, DSP
(Note 5)
Close
Open
Face
Occupied
minimum
position
Off
6: Exhaust fan on
Outdoor air damper
full open
Face and bypass
full bypass
On, DSP
(Note 5)
Close
Close
Bypass
Open
On
(Note 6)
7: Exit (Note 4)
