Lontalk Communications Interface For Chillers (Lci-C) Option - Trane CGWF Installation Operation & Maintenance

52
Installation Electrical
To prevent control malfunctions, do not run low voltage wiring (<30 V) in
conduit with conductors carrying more than 30 volts.
Field wiring for the communication link must meet the following requirements:
• All wiring must be in accordance with the NEC and local codes.
• Communication link wiring must be shielded, twisted pair wiring (Belden 8760 or
equivalent). See the table below for wire size selection
:
Table 14 Wire Size
Wire Size
14 AWG (2.5 mm
16 AWG (1.5 mm
18 AWG (1.0 mm
• The communication link cannot pass between buildings.
• All units on the communication link can be connected in a "daisy chain"
configuration.

LonTalk Communications Interface for Chillers (LCI-C) Option

CH530 provides an optional LonTalk Communication Interface (LCI-C) between the
chiller and a Building Automation System (BAS). An LCI-C LLID shall be used to
provide "gateway" functionality between a LonTalk compatible device and the Chiller.
The inputs/outputs include both mandatory and optional network variables as
established by the LonMark Functional Chiller Profile 8040.
Installation Recommendations
• 22 AWG Level 4 unshielded communication wire recommended for most LCI-C
installations
• LCI-C link limits: 4500 feet, 60 devices
• Termination resistors are required
– 105 ohms at each end for Level 4 wire
– 82 ohms at each end for Trane "purple" wire
• LCI-C topology should be daisy chain
• Zone sensor communication stubs limited to 8 per link, 50 feet each (maximum)
• One repeater can be used for an additional 4500 feet, 60 devices, 8
communication stubs
Table 15 LonTalk Points List
Inputs
Chiller Enable/Disable Command
Chilled Water Setpoint
Current Limit Setpoint
Chiller Mode (i.e. Heat, Cool, Free Cool, Ice)
Outputs
Run Modes (i.e. Off, Starting, Running, Shutting Down)
Operating Modes (i.e.Heat, Cool, Free Cool, Ice)
State (Alarm, Run Enabled, Local Control, Limited)
Active Chilled/Hot Water Setpoint
Actual Capacity (Percent Rated Load Amps)
Active Current Limit Setpoint
Evaporator Leaving Water Temperature
Evaporator Entering Water Temperature
Condenser Entering Water Temperature
Condenser Leaving Water Temperature
Maximum Length of Communication Wire
2
)
2
)
2
)
5,000 FT (1525 m)
2,000 FT (610 m)
1,000 FT (305 m)
CGWF-SVX01A-EN