Installation and Maintenance Manual

Diagnostics
UV-SVN02C-EN 89
Output Testing and Diagnostics
(Tracer ZN520)
Room too cool X Room sensor is not properly set. Reset room sensor temperature.
X Clogged filter. Replace filter.
X Face and bypass damper, or coil valve is
malfunctioning.
Replace malfunctioning component, or
contact the control’s contractor, or if Trane
controls, see CNT-SVX04A-EN for more
information concerning Tracer controls.
X OA damper is in the open position. Ensure OA damper is in the closed or
minimum outside air position.
X Boiler pressure or temperature design
requirements not being met.
On hot water and steam type units, check the
boiler pressure or temperature to ensure that
the requirements are being met.
Room too cool
Unit utilizes Wall Fin auxiliary
radiation:
X Radiation controls malfunctioning. Check the operation of the wall fin controls.
Room too hot X Room sensor is not properly set. Reset room sensor temperature.
X Clogged filter. Replace filter.
X Face and bypass damper, or coil valve is
malfunctioning.
Replace malfunctioning component, or
contact the control’s contractor, or if Trane
controls, see CNT-SVX04A-EN for more
information concerning Tracer controls.
X OA damper is in the open position. Ensure OA damper is in the minimum outside
air position.
X Chiller temperature design requirements not
being met.
Check the temperature of the water leaving
the chiller to ensure that it meets design
requirements.
Motor X If the motor fails to start, and other motors
on the same circuit are functioning.
Check the unit switch to ensure it is in the ON
position.
X If the motor fails to start, and other motors
on the same circuit are functioning.
Check for loose switch or motor connection.
Unit
265 and 460 volt unit
X X If the unit fails to start. Check fuse in right-hand end pocket inside the
transformer mounting box. Replace with
Trane fuse X1311057435 (ABC type 6A
250V).
Problem Heating Cooling Cause Correction
Table 29. Tracer ZN520 diagnostics
Diagnostic Fan Other Outputs
(a)
Condensate
overflow
Off Valves Closed, Fresh air damper Closed, Electric
heat Off, Baseboard heat Off
Low temperature
detection
Off Valves Open, Fresh air damper Closed, Electric heat
Off, Baseboard heat Off
Low air flow - fan
failure
Off Valves Closed, Fresh air damper Closed, Electric
heat Off, Baseboard heat Off
Space
temperature
failure
Off Valves Closed, Fresh air damper Closed, Electric
heat Off, Baseboard heat Off
Entering water
temp failure
On Valves Enabled
(b)
, Fresh air damper Enabled
(b)
,
Electric heat Enabled
(b)
, Baseboard heat Off
Discharge air
temp low limit
Off Valves Open, Fresh air damper Closed, Electric heat
Off, Baseboard heat Off
Discharge air
temp failure
Off Valves Closed, Fresh air damper Closed, Electric
heat Off, Baseboard heat Off
Fresh air temp
failure
On Valves Enabled, Fresh air damper Minimum
position
(c)
, Electric heat Enabled, Baseboard heat
Enabled
Relative humidity
failure
On Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled, Baseboard heat Enabled
Generic 4–20mA
failure
On Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled, Baseboard heat Enabled
CO
2
Input failure On Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled, Baseboard heat Enabled
Maintenance
required
On Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled, Baseboard heat Enabled
Local fan mode
failure
On Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled, Baseboard heat Enabled
Local setpoint
failure
On Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled, Baseboard heat Enabled
Invalid unit
configuration
Off Valves Disabled, Fresh air damper Disabled,
Electric heat Disabled, Baseboard heat Disabled
Normal—power
up
On Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled
(a) The generic binary output (TB4-1, TB4-2) state is unaffected by all unit
diagnostics.
(b)When the entering water temperature is required but not present, the
Tracer ZN520 controller generates a diagnostic to indicate the sensor
loss condition. The controller automatically clears the diagnostic once
a valid entering water temperature value is present (non-latching di-
agnostic). When the entering water temperature sensor fails, the con-
troller prohibits all hydronic cooling operation, but allows the delivery
of heat when heating is required. In the Cool mode, all cooling is locked-
out, but normal fan and outdoor air damper operation is permitted.
(c) When the outdoor air temperature sensor has failed or is not present,
the Tracer ZN520 controller generates a diagnostic to indicate the sen-
sor loss condition. The controller automatically clears the diagnostic
once a valid outdoor air temperature value is present (non-latching di-
agnostic). When the outdoor air temperature sensor fails or is not pres-
ent, the controller prohibits economizer operation.
Table 29. Tracer ZN520 diagnostics
Diagnostic Fan Other Outputs
(a)
UV-SVN02_-EN.book Page 89 Thursday, January 24, 2013 4:48 PM