60 LPC-SVX01C-EN
Operation
general
information
IN8: Run/stop
This hard-wired binary input IN8 can be
used for a variety of functions to
shut down the unit. The Tracer AH540/541
controller systematically shuts down unit
operation and reports a Unit Shutdown
diagnostic upon detecting a stop input.
For example, a condensate overflow
sensor or a smoke detector can be
connected to the run/stop input to shut
down unit operation.
The run/stop input can be configured as a
latching or non-latching Unit Shutdown
diagnostic. If the input is configured as
non-latching, the unit will be returned to
normal operation when the input is in the
run state. If the run/stop input is config-
ured as latching, the input must first be
returned to the run state, and the
diagnostic must be reset in the controller
before the unit is allowed to run. See
Table O-GI-9.
Table O-GI-9. Run/Stop IN 8 Binary Input
Configuration
Contact Contact
Configuration Closed Open
Not used Run Run
Normally closed Run Stop
Normally open Stop Run
IN9: Occupancy or generic
The Tracer AH540/541 controller uses the
occupancy binary input IN9 for
two occupancy-related functions or as a
generic binary input.
Local occupancy mode request
For controllers not receiving a
communicated occupancy mode request,
the local occupancy binary input
determines the unit occupancy based on
the hard-wired signal (see Table O-GI-10).
Normally, the signal is hard-wired to a
binary switch or clock.
If the occupancy input is configured as
normally open and a hard-wired occu-
pancy signal on binary input IN9 is open,
then the unit switches to occupied mode.
If the hard-wired occupancy signal is
closed, the controller switches to unoccu-
pied mode (only if the occupied bypass
timer = 0; see “Occupied bypass mode”).
Table 11. Occupancy IN9 binary input
Configuration Contact closed Contact open
normally closed occupied unoccupied
normally open unoccupied occupied
Table O-GI-11. Fan Status Binary IN 10 Configuration
IN 10
Configuration Contact Closed Contact Open
Not used Normal Normal
Normally closed Latching diagnostic
(Note 1)
Normal
Normally open Normal Latching diagnostic
(Note 1)
Note 1: A Low Supply Fan Air Flow diagnostic is generated when the controller turns on the supply fan output, but the
supply fan status binary input indicates the supply fan is not running after the configurable fan delay time.
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 configurable 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 O-GI-11).
Table O-GI-12. Filter Status Configuration
IN 11
Configuration Contact Closed Contact Open
Not used Clean Clean
Normally closed Clean Dirty
Normally open Dirty Clean
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
applications, 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 pressure 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.
Although the filter status switch is
normally open, it is configurable
(see Table O-GI-12).
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