Trane Tracer AH540 User Manual

Chapter 3 Input and Outputs
26 CNT-SVX05B-EN
Generic binary input
Binary input IN9 can be configured as a generic binary input for a variety
of applications with a Tracer Summit system only. The binary input does
not affect controller operation. A generic binary input can be monitored
only from Tracer Summit.
IN10: Supply fan status
The fan status binary input IN10 indicates the presence of air flow
through the supply fan of an air-handling unit. For Tracer AH540/541
applications, a differential pressure switch detects fan status, with the
high side of the differential being supplied at the unit outlet and the low
side supplied inside the unit. During fan operation, differential pressure
closes the normally open switch and confirms that the fan is operating
properly.
A Low Supply Fan Air Flow diagnostic is detected during the following
two conditions:
• The controller is commanding the fan On and the fan status switch is
not in the closed position.
• The fan status switch does not close the binary input within the con-
figurable fan On delay time limit of the controller commanding the
fan On.
Although the fan status switch is normally open, it is configurable (see
Table 12).
IN11: Filter status
The filter status switch connected to binary input IN11 detects a dirty air
filter and indicates a need for maintenance. For Tracer AH540/541 appli-
cations, a differential pressure switch detects filter status, with the high
side of the differential being supplied at the filter inlet and the low side
supplied at the filter outlet. During fan operation, filter differential pres-
sure increases as the filter becomes increasingly dirty.
A normally open filter status switch closes when the differential pressure
reaches a set threshold. This is a non-latching, informational diagnostic;
the controller will continue normal unit operation.
Table 12. Fan status binary input IN10 configuration
IN10 configuration Contact closed Contact open
Not used Normal Normal
Normally closed
Latching diagnostic
1
Normal
Normally open Normal
Latching diagnostic
1
1 A latching diagnostic, Low Supply Fan Air Flow, is generated when the controller
turns on the supply fan output, but binary input IN10 indicates that the supply fan is
not running after the fan delay time (configurable).

Trane Tracer AH540 Specifications

General

Brand	Trane
Model	Tracer AH540
Category	Controller
Language	English