Installation - Electrical
88 RTAC-SVX01J-EN
Alarm and Status Relay Outputs
(Programmable Relays)
A programmable relay concept provides for enunciation of
certain events or states of the chiller, selected from a list of
likely needs, while only using four physical output relays,
as shown in the field wiring diagram.The four relays are
provided (generally with a Quad Relay Output LLID) as part
of the Alarm Relay Output Option.The relay’s contacts are
isolated Form C (SPDT), suitable for use with 120 VAC
circuits drawing up to 2.8 amps inductive, 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 Table 42..The relay
will be energized when the event/state occurs.
Relay Assignments Using
TechView
CH530 ServiceTool (TechView) is used to install the Alarm
and Status Relay Option package and assign any of the
above list of events or status to each of the four relays
provided with the option.The relays to be programmed
are referred to by the relay’s terminal numbers on the LLID
board 1U12.
The default assignments for the four available relays of the
R
TAC Alarm and Status Package Option are:
If any of the Alarm/Status relays are used, provide
electrical
power, 115 VAC with fused-disconnect to the
panel and wire through the appropriate relays (terminals
on 1U12 (EUR=A4-5)). Provide wiring (switched hot,
neutral, and ground connections) to the remote
annunciation devices. Do not use power from the chiller’s
control panel transformer to power these remote devices.
Refer to the field diagrams which are shipped with the unit.
Low Voltage Wiring
The remote devices described below require low voltage
wiring. All wiring to and from these remote input devices
to the Control Panel must be made with shielded, twisted
pair conductors. Be sure to ground the shielding only at
the panel.
Important: T
o prevent control malfunctions, do not run
low voltage wiring (<30 V) in conduit with
conductors carrying more than 30 volts.
Table 42. Alarm and Status Relay Output Configuration
Table
Description
Alarm - Latching
This output is true whenever there is any
active diagnostic that requires a manual reset
to clear, that affects either the Chiller, the
Circuit, or any of the Compressors on a circuit.
This classification does not include
informational diagnostics.
Alarm - Auto Reset
This output is true whenever there is any
active diagnostic that could automatically
clear, that affects either the Chiller, the
Circuit, or any of the Compressors on a circuit.
This classification does not include
informational diagnostics.
Alarm
This output is true whenever there is any
diagnostic affecting any component, whether
latching or automatically clearing. This
classification does not include informational
diagnostics
Alarm Ckt 1
This output is true whenever there is any
diagnostic effecting Refrigerant Circuit 1,
whether latching or automatically clearing,
including diagnostics affecting the entire
chiller. This classification does not include
informational diagnostics.
Alarm Ckt 2
This output is true whenever there is any
diagnostic affecting Refrigerant Circuit 2
whether latching or automatically clearing,
including diagnostics effecting the entire
chiller. This classification does not include
informational diagnostics.
Chiller Limit Mode (with
a 20 minute filter)
This output is true whenever the chiller has
been running in one of the Unloading types of
limit modes (Condenser, Evaporator, Current
Limit or Phase Imbalance Limit) continuously
for the last 20 minutes.
Circuit 1 Running
This output is true whenever any compressors
are running (or commanded to be running) on
Refrigerant Circuit 1, and false when no
compressors are commanded to be running
on that circuit.
Circuit 2 Running
This output is true whenever any compressors
are running (or commanded to be running) on
Refrigerant Circuit 2, and false when no
compressors are commanded to be running
on that circuit.
Chiller Running
This output is true whenever any compressors
are running (or commanded to be running) on
the chiller and false when no compressors are
commanded to be running on the chiller.
Maximum Capacity
(software 18.0 or later)
This output is true whenever the chiller has
reached maximum capacity or had reached its
maximum capacity and since that time has
not fallen below 70% average current relative
to the rated ARI current for the chiller. The
output is false when the chiller falls below
70% average current and, since that time,
had not reestablished maximum capacity.
Table 43. Default assignments
Relay
Relay 1 Terminals J2 -12,11,10: Alarm
Relay 2 Terminals J2 - 9,8,7: Chiller Running
Relay 3 Terminals J2-6,5,4: Maximum Capacity
Relay 4 Terminals J2-3,2,1: Chiller Limit
Table 42. Alarm and Status Relay Output Configuration
Table (continued)
Description
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