Output Testing And Diagnostics (Tracer Zn520) - Trane HUV Installation, Operation And Maintenance Manual

Problem
Room too cool
Room too cool
Unit utilizes Wall Fin auxiliary
radiation:
Room too hot
Motor
Unit
265 and 460 volt unit
Output Testing and Diagnostics
(Tracer ZN520)
Table 29. Tracer ZN520 diagnostics
Diagnostic Fan Other Outputs
Condensate Off Valves Closed, Fresh air damper Closed, Electric
overflow heat Off, Baseboard heat Off
Low temperature Off Valves Open, Fresh air damper Closed, Electric heat
detection Off, Baseboard heat Off
Low air flow - fan Off Valves Closed, Fresh air damper Closed, Electric
failure heat Off, Baseboard heat Off
Space Off Valves Closed, Fresh air damper Closed, Electric
temperature heat Off, Baseboard heat Off
failure
Entering water On Valves Enabled
temp failure Electric heat Enabled
Discharge air Off Valves Open, Fresh air damper Closed, Electric heat
temp low limit Off, Baseboard heat Off
Discharge air Off Valves Closed, Fresh air damper Closed, Electric
temp failure heat Off, Baseboard heat Off
Fresh air temp On Valves Enabled, Fresh air damper Minimum
(c)
failure position
Enabled
Relative humidity On Valves Enabled, Fresh air damper Enabled, Electric
failure heat Enabled, Baseboard heat Enabled
Generic 4–20mA On Valves Enabled, Fresh air damper Enabled, Electric
failure heat Enabled, Baseboard heat Enabled
UV-SVN02C-EN
Heating Cooling Cause
X Room sensor is not properly set.
X Clogged filter.
X Face and bypass damper, or coil valve is
malfunctioning.
X OA damper is in the open position.
X Boiler pressure or temperature design
requirements not being met.
X Radiation controls malfunctioning.
X Room sensor is not properly set.
X Clogged filter.
X Face and bypass damper, or coil valve is
malfunctioning.
X OA damper is in the open position.
X Chiller temperature design requirements not
being met.
X If the motor fails to start, and other motors
on the same circuit are functioning.
X If the motor fails to start, and other motors
on the same circuit are functioning.
X X If the unit fails to start.
(a)
(b)
, Fresh air damper Enabled
(b)
, Baseboard heat Off
, Electric heat Enabled, Baseboard heat
Table 29. Tracer ZN520 diagnostics
Diagnostic Fan Other Outputs
CO Input failure On
2
Maintenance On
required
Local fan mode On
failure
Local setpoint On
failure
Invalid unit Off
configuration
Normal—power On
up
(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
(b)
,
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.
Diagnostics
Correction
Reset room sensor temperature.
Replace filter.
Replace malfunctioning component, or
contact the control's contractor, or if Trane
controls, see CNT-SVX04A-EN for more
information concerning Tracer controls.
Ensure OA damper is in the closed or
minimum outside air position.
On hot water and steam type units, check the
boiler pressure or temperature to ensure that
the requirements are being met.
Check the operation of the wall fin controls.
Reset room sensor temperature.
Replace filter.
Replace malfunctioning component, or
contact the control's contractor, or if Trane
controls, see CNT-SVX04A-EN for more
information concerning Tracer controls.
Ensure OA damper is in the minimum outside
air position.
Check the temperature of the water leaving
the chiller to ensure that it meets design
requirements.
Check the unit switch to ensure it is in the ON
position.
Check for loose switch or motor connection.
Check fuse in right-hand end pocket inside the
transformer mounting box. Replace with
Trane fuse X1311057435 (ABC type 6A
250V).
(a)
Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled, Baseboard heat Enabled
Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled, Baseboard heat Enabled
Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled, Baseboard heat Enabled
Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled, Baseboard heat Enabled
Valves Disabled, Fresh air damper Disabled,
Electric heat Disabled, Baseboard heat Disabled
Valves Enabled, Fresh air damper Enabled, Electric
heat Enabled
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