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Trane RTAC 140-500 ton units (60 Hz) manual Low Voltage Wiring, Relay Assignments Using TechView

Models: RTAC 140-400 ton units (50 HZ) RTAC 140-500 ton units (60 Hz) Series R Air-Cooled Helical Rotary Liquid Chillers

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Installation - Electrical

 

 

 

 

 

Table 21

Alarm and Status Relay Output Configuration Table

 

 

 

 

 

 

 

Description

 

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

This output is true whenever the chiller has been running in one of the Unloading types of limit modes

 

(with a 20 minute fil- (Condenser, Evaporator, Current Limit or Phase Imbalance Limit) continuously for the last 20 minutes. ter)

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

This output is true whenever the chiller has reached maximum capacity or had reached its maximum

(software 18.0 or

capacity and since that time has not fallen below 70% average current relative to the rated ARI current

later)

for the chiller. The output is false when the chiller falls below 70% average current and, since that time,

 

had not reestablished maximum capacity.

 

 

 

Relay Assignments Using TechView

 

 

 

CH530 Service Tool (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 RTAC Alarm and Status

 

 

Package Option are:

 

 

 

Table 22

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 (software 18.0 or later)

 

 

Relay 4 Terminals J2-3,2,1:

Chiller Limit

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.

To prevent control malfunctions, do not run low voltage wiring (<30 V) in conduit with conductors carrying more than 30 volts.

Emergency Stop

CH530 provides auxiliary control for a customer specified/installed latching trip out. When this customer-furnished remote contact 5K14 is provided, the chiller will run normally when the contact is closed. When the contact opens, the unit will trip on a manually resettable diagnostic. This condition requires manual reset at the chiller switch on the front of the control panel.

Connect low voltage leads to terminal strip locations on 1U4. Refer to the field diagrams that are shipped with the unit.

RTAC-SVX01F-EN

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Trane RTAC 140-500 ton units (60 Hz) manual Low Voltage Wiring, Relay Assignments Using TechView, Default Assignments Relay
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RTAC 140-400 ton units (50 HZ), RTAC 140-500 ton units (60 Hz), Series R Air-Cooled Helical Rotary Liquid Chillers specifications

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