Relay Assignments Using Tracer Tu - Trane Ascend ACS 140 Installation, Operation And Maintenance Manual

I I n n s s t t a a l l l l a a t t i i o o n n E E l l e e c c t t r r i i c c a a l l
7.2 amps resistive, or 1/3 HP and for 240 VAC circuits
drawing up to 0.5 amp resistive.
The list of events/states that can be assigned to the
programmable relays can be found in the following
table. The relay will be energized when the event/state
occurs.
Table 15. Alarm and status relay output
configurations
Description
This output is true whenever there is any
Alarm active latching shutdown diagnostic that
(Latching) targets the Unit, Circuit, or any of the
Compressors on a circuit.
This output is true whenever there is any
Alarm active non-latching shutdown diagnostic that
(Non-Latching) targets the Unit, Circuit, or any of the
Compressors on a circuit.
This output is true whenever there is any
active latching or non-latching shutdown
Alarm
diagnostic that targets the Unit, Circuit, or
any of the Compressors on a circuit.
This output is true whenever there is any
active latching or non-latching shutdown
Alarm Ckt 1
diagnostic that targets Circuit 1, or any of the
Compressors on Circuit 1.
This output is true whenever there is any
active latching or non-latching shutdown
Alarm Ckt 2
diagnostic that targets Circuit 2, or any of the
Compressors on Circuit 2.
This output is true whenever a circuit on the
unit has been running in one of the limit
modes continuously for the Limit Relay
debounce time. A given limit or overlapping of
Unit Limit Mode
different limits must be in effect continuously
for the debounce time prior to the output
becoming true. It will become false if no limits
are present for the debounce time.
Compressor The output is true whenever any compressor
Running
is running.
Circuit 1 The output is true whenever any compressor
Running of Circuit 1 is running.
Circuit 2 The output is true whenever any compressor
Running of Circuit 2 is running.
This output is true when Ice Building status is
Ice Making
active.
The output is true whenever the unit has
reached maximum capacity continuously for
Maximum
the Max Capacity Relay debounce time. The
Capacity
output is false when the unit is not at
maximum capacity continuously for the filter
debounce time.
38
Table 15. Alarm and status relay output
configurations (continued)
Description
This relay output is energized any time either
the Low Evaporator Water Temperature – Unit
Off or the Low Evaporator Temperature Ckt x
– Unit Off diagnostics are active. This relay is
intended for use as an external interlock for a
field engineered and provided solution to
mitigate the freeze danger implied by these
diagnostics. Generally, this would be used in
Evaporator cases where operation of the evaporator
Water Freeze water pump is unacceptable due to the
Avoidance system constraints, (i.e. such as mixing
Request unconditioned warm water with controlled
supply water as provided by other parallel
chillers. The relay's output can provide the
method to close bypass valves so the
circulation becomes local to the evap and
excludes the load, or can be used to defeat
the evap pump override entirely while
initiating an independent source of heat / flow
to the evap.
This selection is desirable to provide an easy
way for a customer to defeat the effect of the
relay, if it has already been wired. For
instance, if the relay was normally
None
programmed as an "alarm" relay, and was
wired to a claxon, it may be desirable to
temporarily defeat the feature without
changing wiring.
Service This relay will be energized when at least one
Request Maintenance alert condition (refer to Service
(for unit required message specification) occurs, as
compressor or long as at least one of associated
water pump) informational diagnostic(s) will be active.
The output is true if capacity control is in Hot
Water Control mode (water temperature
being controlled to the Active Hot Water
Hot Water
Setpoint). The output is false in any other
Control
capacity control mode (Chilled Water Control,
Ice Making, etc.)
Relay Assignments Using Tracer
TU
Tracer® TU Service Tool is used to install the
Programmable Relay Option package and assign any of
the above list of events or status to each of the four
relays provided with the option. (See Tracer® TU
section of Controls chapter for more information on
this service tool.) The relays to be programmed are
referred to by the relay's terminal numbers on the LLID
board 1A18.
The default assignments for the four available relays of
the Programmable Relay option are show in the table
below.
AC-SVX002D-EN