Trane CSRA025FAF0, Installation Operation & Maintenance

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44 CSRA-SVX02A-EN
Installation
Remote Running/Alarm Indicator (Optional)
If the remote run indication and alarm contacts are used, a 24 VAC control
circuit must be provided between the Remote Running/Alarm Indicator panel
and the appropriate terminals located at the UCM. Maximum contact rating
@ 24 VAC is 10 Amp in-rush and 3.2 Amp sealed. Refer to the “Field Wiring”
diagrams illustrated in Figure 20A. Provide a proper remote panel ground
connection.
External Auto/Stop (Optional)
If the unit utilizes an optional remote Auto/Stop function, the installer must
provide control wiring from the remote pump relay contacts (5S67) to the
appropriate terminals on 1TB4 terminal board.
When this set of contacts opens, the UCM reads it as a command to stop
chiller operation and begin the pump down cycle (if enabled).
Circuit requirements are 2-wire, 24 VDC; w/maximum contact rating 12 mA.
Refer to the field wiring diagram illustrated in Figure 20A for the termination
points.
Flow Control Interlock (6S1)
The flow switch is a binary output device and is wired within the interlock
circuit if a chilled water flow interlock diagnostic is desired for the system.
Before installing the control wiring, refer to Figure 4 for the electrical access
into the control panel. Refer to the field connection diagram for the specific
connection points.
Provide a proper ground for all control circuitry at the ground connection
screws provided within the unit's control panel.
Controls using DC Analog Input/Outputs
(Standard Low Voltage Multiconductor Wire)
Before installing any connecting wiring between the unit and components
utilizing a DC analog input\output signal, refer to Figure 4 for the electrical
access locations provided on the unit.
A. Table 6 lists the conductor sizing guidelines that must be followed when
interconnecting the DC Installation binary output devices and the system
components utilizing a DC analog input\output signal to the unit.
Note: Resistance in excess of 2.5 ohms per conductor can cause deviations
in the accuracy of the controls.
B. Ensure that the wiring between the binary and analog controls and the
unit's termination point does not exceed two and a half (2.5) ohms/conduc-
tor for the length of the run.
C. Do not run the electrical wires transporting DC signals in or around conduit
housing high voltage wires.