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ZN010, ZN510, and ZN520 Controllers
Table 76. Test sequence for 1-heat/1-cool configurations for Tracer ZN010, ZN510, and ZN520
Steps
1. Off
2. Fan High
3. Fan Medium
4. Fan Low
5. Cool
6. Heat
7. Fresh Air Damper
8. Exit
1
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
Notes:
stage.This occurs even though during normal 2-pipe changeover operation BOP4 controls the unit valve for both cooling and heating.
2
At the beginning of the Fan High step, the controller attempts to clear all diagnostics
3
The fresh air damper (BOP6) only energizes during this step if binary output 6 has been configured as a fresh air damper.
4
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
Table 77.
Tracer ZN520 test sequence
Step
1
1.
Off
2
2.
Fan high
3
3.
4.
Fan low
5.
Main open
6.
Main close, EH1 on
7.
Aux. open
8.
Aux. close, damper open
9.
Damper close
10. Generic/baseboard heat
energized
5
11. Exit
1
Upon entering manual output test mode, the controller turns off all fan and electric heat outputs and drives.
Notes:
2
At the beginning of
Step
3
The low fan speed output energizes at
4
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
exhaust fan output is shared with medium speed.
5
After
Step
10, the test sequence performs an exit. This initiates a reset and attempts to return the controller to normal operation.
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:
•
Low coil temperature detection
•
Condensate overflow
•
Low air flow—fan status
•
Discharge air temp limit
•
Space temperature failure
•
Entering water temp failure
•
Discharge air temp failure
•
Outdoor air temp failure
1
Non-latching diagnostics automatically reset when the input is present and valid.
2
Does not apply to the Tracer UC400 controller.
138
Fan BOP1-3
Off
High
Medium
Low
High
High
High
4
Main
Fan
Valve
J1-1
J1-2
J1-3
Off
Off
Off
High
Off
Off
Off
Off
Off
Off
Low
High
Off
Off
High
Off
Off
High
4
Exh
Off
EH1 on
High
Off
Off
High
Off
Off
High
Off
Off
Exit
2, the controller attempts to clear all diagnostics.
Step
3. If the unit is configured for a 1-speed fan, the fan remains on high speed at
1
1
1
1
Cool Output BOP4
Heat Output BOP5
Off
2
Off
Off
Off
On
Off
Off
Electric Heat or
Fresh Air
Aux. Valve
Damper
J1-5
J1-6
J1-9
On
Off
Off
EH: off
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
On
On
Off
Off
On
Off
Off
Off
EH1 off
Off
Off
Off
Off
Off
Off
•
Local setpoint failure
•
Local fan mode failure
•
CO
sensor failure
2
•
Generic AIP failure
•
Humidity input failure
•
Defrosting compressor lockout
•
Maintenance required
•
Invalid Unit Configuration
•
Generic temperature failure
•
Discharge air low limit
Resetting Diagnostics
There are seven ways to reset unit diagnostics:
•
Automatically by the controller
•
By initiating a manual output test at the controller
(Tracer ZN010, ZN510, or ZN520 only)
Damper BOP6
Off
Closed
Off
Closed
Off
Closed
Off
Closed
Off
Closed
On
Closed
Off
Open
Generic/Baseboard Heat
J1-10
J1-11
J1-12
aux: on
Off
On
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
On
Off
EH2 on
Off
Off
On
Off
Off
Off
Step
3.
Step
1
1
1
1
1
1
2
2
2
UNT-SVX07E-EN
3
TB4-1
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
7. The
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Troubleshooting
