Trane BCVC User Manual

BCXC-SVX01B-EN

Diagnostics

Translating Multiple Diagnostics

The controller senses and records each diagnostic independently of other diagnostics. It is possible
to have multiple diagnostics present simultaneously. The diagnostics are reported in the order they
occur.

Possible diagnostics include:

Table 39. Tracer ZN010 and ZN510 test sequence for 1-heat/1-cool configurations

Steps

Fan

Cool output

(a)

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

Heat output

Damper

J1-1, J1-3

J1-

1. Off

Off

Closed

2. Fan high

High

Off

Closed

3. Exhaust fan

(b)

(b) Tracer™ ZN010 and ZN510 have a binary output default as “none” on J1-X from the factory. If the unit has a 2-speed fan,

step 3 will energize the low fan speed. If the unit has a single speed fan, step 3 will continue to energize the high fan speed.

This binary output can be reconfigured as an exhaust fan, with the use of Rover™ software.

Off

Closed

4. Fan

Low

Off

Closed

5. Cool

High

Off

Closed

6. Heat

High

Off

Closed

7. Two-position damper

(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.

High

Off

Open

8. Exit

(d)

(d) For all 1-heat/1-cool applications including 2-pipe changeover, the cooling and heat test stage energize. This occurs even

though during normal 2-pipe changeover operation binary output controls the unit valve for both cooling and heating.

Note: The 2-position damper energizes during this step if the controller is configured for a 2-position damper.

Table 40. Tracer ZN520 test sequence

Step

Fan

Main
valve

Electric heat or

aux. valve

Fresh air
damper

Generic/baseboard heat

J1-1

J1-2

J1-3

J1-5

J1-6

J1-9

J1-10

J1-11

J1-12

TB4-1

1. Off

(a)

Off

On
EH: off

Off

aux: on

Off

2. Fan high

(b)

High

Off

(c)

Off

4. Fan low

Off

Low

Off

5. Main open

High

Off

6. Main close, EH1 on

High

Off

7. Aux. open

High
EH1 on

Exh

(d)

Off

8. Aux. close, damper open

High

Off

Off
EH1 off

On
EH2 on

Off

9. Damper close

High

Off

10. Generic/baseboard heat energized High

Off

11. Exit

(e)

Exit

(a) Upon entering manual output test mode, the controller turns off all fan and electric heat outputs and drives.

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

(c) The low fan speed output energizes at step 3. If the unit is configured for a 1 speed fan, the fan remains on high speed at step 3.

(d) If the unit is configured for a 1- or 2-speed fan, and BOP2 is configured for an exhaust fan, the exhaust fan output energizes on step 7. The exhaust

fan output is shared with medium speed.

(e) After step 10, the test sequence performs an exit. This initiates a reset and attempts to return the controller to normal operation.