Trane UNT-SVX07A-EN, UniTrane Fan-Coil & Force Flo Air Conditioners Maintenance troubleshooting

Maintenance troubleshooting

•Verify output wiring and operation without using Rover™, service tool

•Force the water valve to open and balance the hydronic system

Note: The 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 diagnos- tic 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 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 off all outputs and then attempt to clear all diagnostics.

3.Press the TEST button several 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 M-T-1. Test sequence for 1-heat/1-cool configurations

steps	fan	cool output	heat output	damper
	BOP1-3	BOP4 (1)	BOP5	BOP6
1. off	off	off	off	closed
2. fan High	high	off	off	closed
3. fan medium	medium	off	off	closed
4. fan low	low	off	off	closed
5. cool	high	on	off	closed
6. heat	high	off	on	closed
7. fresh air	high	off	off	open
damper (3)
8. exit	(2)

Notes:

(1)At the beginning of step 2, the controller attempts to clear all diagnostics.

(2)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.

(2)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.

(3)The fresh air damper (BOP6) only energizes during this step if binary output 6 has been configured as a fresh air damper.

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