Maintenance; Diagnostics - Trane FC Installation & Operation Manual

Unitrane fan-coil & force flo air conditioners 200 to 1,200 cfm, “zo” and later design sequence & “so” and later design sequence

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Installation, operation and maintenance manual (164 pages)

Table Of Contents

Table of Contents

Diagnostics

Table

. Tracer ZN520 Diagnostics

M-D-1

Diagnostic

Fan

Condensate overflow

Off

Low temperature detection

Off

Low air flow - fan failure

Off

Space temperature failure

Off

Entering water temp failure

Discharge air temp low limit

Off

Discharge air temp failure

Off

Fresh air temp failure

Relative humidity failure

Generic 4-20ma failure

Input failure

Maintenance required

Local fan mode failure

Local setpoint failure

Invalid unit configuration

Off

Normal – power up

Note 1: The generic binary output (TB4-1, TB4-2) state is unaffected by all unit diagnostics.

Note 2: 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 diagnostic). When the entering water

temperature sensor fails, the controller 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.

Note 3: When the outdoor air temperature sensor has failed or is not present, the Tracer ZN520 controller generates a diagnostic to indicate the sensor loss condition.

The controller automatically clears the diagnostic once a valid outdoor air temperature value is present (non-latching diagnostic). When the outdoor air temperature

sensor fails or is not present, the controller prohibits economizer operation.