Installation and Maintenance Manual

Diagnostics
UNT-SVX07D-EN 123
If the LED is off, either the power is off, an abnormal
condition is present or the TEST button is pressed.
Yellow COMM LED (Tracer ZN520)
If the LED is off continuously, the controller is not detecting
any communication. This is normal for units in standalone
applications.
If the LED blinks, the controller detects communication.
If the LED is on continuously, this indicates an abnormal
condition.
Manual Output Test (Tracer ZN520)
The purpose of the manual output test sequence is to
verify output and end device operation. Use the manual
output test to:
• Verify output wiring and operation without using
Rover, service tool
• Force the water valve to open and balance the hydronic
system
Note: T
he manual output test is not an automatic cycle.
You must press the TEST button to proceed
through each step.
The controller observes all diagnostics that occur during
the test sequence. Although an automatic diagnostic reset
sequence exists as part of the controller’s normal
operation, the automatic diagnostic reset feature is not
active during the test sequence.
If left in an individual test step, the controller remains in
test mode for 60 minutes and then exits to normal
operation.
Many service calls are due to unit diagnostics. The test
sequence resets unit diagnostics and attempts to restore
normal unit operation prior to testing the outputs. If the
diagnostics remain after a reset, the STATUS LED indicates
the diagnostic condition is still present (two blinks).
Manual Output Test Procedure (Tracer ZN010,
ZN510, and ZN520)
Follow the procedure below to test the Tracer ZN010,
ZN510, and ZN520 controllers.
1. Press and hold the TEST button for at least two
seconds (not exceeding 5 seconds), and then release,
to start the test mode.
2. The test sequence will turn of
f all outputs and then
attempt to clear all diagnostics.
3. Press the TEST button sever
al more times (no more
than once per second) to advance through the test
sequence.
The outputs are not subject to minimum times during the
test
sequence. However, the test sequence only permits
one step per second which limits minimum output time.
The green LED is turned off when the TEST button is
pressed. To begin the manual output test mode, press and
hold the TEST button (turning off the green LED) for at least
two seconds.The green LED will begin to blink, indicating
the controller is in test mode.
Table 54. Test sequence for 1-heat/1-cool configurations
(Tracer ZN010, ZN510, and ZN520)
Steps
Fan
BOP1-3
Cool
Output
BOP4
(a)
(a)At the beginning of the Fan High step, the controller attempts to clear
all diagnostics.
Heat
Output
BOP5
Damper
BOP6
1. Off Off Off Off Closed
2. Fan High High Off Off Closed
3. F a n M e d i u m M e d i u m O f f Off C l o s e d
4. Fan Low Low Off Off Closed
5. Cool High On Off Closed
6. Heat High Off On Closed
7. Fresh Air Damper
(b)
(b)The fresh air damper (BOP6) only energizes during this step if binary
output 6 has been configured as a fresh air damper.
High Off Off Open
8. Exit
(c)
(c) After the Fresh Air Damper step, the test sequence performs the Exit
step.This initiates a reset and attempts to return the controller to normal
operation.
Note: For all 1-heat/1-cool applications including 2-pipe changeover, BOP4
energizes in the cooling test stage and BOP5 energizes in the heat
test stage.This occurs even though during normal 2-pipe changeover
operation BOP4 controls the unit valve for both cooling and heating.
UNT-SVX07_-EN.book Page 123 Friday, April 27, 2012 9:40 AM