RLC-SVX02G-E4
54
Installation – Electrical
LonTalk® Communications
Interface for Chillers
(LCI-C)
CH.530 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 0.5 mm² Level 4
unshielded communication wire
recommended for most LCI-C
installations
• LCI-C link limits: 1400 m, 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, 15 m each
(maximum)
• One repeater can be used for an
additional 1400 m, 60 devices, 8
communication stubs
LonTalk Points List
Inputs Variable type SNVT_Type
Chiller Enable/Disable binary start(1)/stop(0) SNVT_switch
Chilled Water Setpoint analog temperature SNVT_temp_p
Current Limit Setpoint analog % current SNVT_lev_percent
Chiller Mode (1) SNVT_hvac_mode
Outputs
Chiller On/Off binary on(1)/off(0) SNVT_switch
Active Chilled Water Setpoint analog temperature SNVT_temp_p
Percent RLA analog % current SNVT_lev_percent
Active Current Limit Setpoint analog % current SNVT_lev_percent
Leaving Chilled Water Temperature analog temperature SNVT_temp_p
Entering Chilled Water Temperature analog temperature SNVT_temp_p
Entering Condenser Water Temperature analog temperature SNVT_temp_p
Leaving Condenser Water Temperature analog temperature SNVT_temp_p
Alarm Description (2) SNVT_str_asc
Chiller Status (3) SNVT_chlr_status
(1) Chiller Mode is used to place the chiller into an alternate mode; Cool or Ice Build
(2) Alarm Description denotes alarm severity and target.
Severity: no alarm, warning, normal shutdown, immediate shutdown
Target: Chiller, Platform, Ice Building (Chiller is refrigerant circuit and Platform is control circuit)
(3) Chiller Status describes Chiller Run Mode and Chiller Operating Mode.
Run Modes: Off, Starting, Running, Shutting Down
Operating Modes: Cool, Ice Build
States: Alarm, Run Enabled, Local Control, Limited, CHW Flow, Cond Flow
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