Installation - Electrical
92 RTAC-SVX01J-EN
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 forTrane "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
BACnet Communications Interface (BCI-C)
Optional BACnet Communication Interface for Chillers
(BCI-C) is comprised of aTracer UC400 controller with
interface software. It is a non-programmable
communications module that allows units to
communicate on a BACnet communications network.
BACnet Data Points and Configuration
Property Definitions
The BCI-C device allows certain models ofTrane chillers
with CH530 controls to communicate with BACnet
systems and devices using BACnet MS/TP.This section
includes information about:
• BACnet protocol implementation conformance
statement
(PICS)
• Object types: descriptions and configuration (refer to
Table 46, p. 94)
• BACnet protocol: data link layers, device address
binding,
networking options, and character sets
• Object data points and configurations
BACnet Protocol Implementation
Conformance Statement (PICS)
Standardized Device Profile (Annex L)
Table 45. LonTalk points list
LonTalk Communications Interface
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 See note 1 SNVT_hvac_mode
Outputs
Variable
type SNVT_Type
Outputs
Variable
type
SNVT_Type
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
Notes:
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 Mode: off, starting, running shutting down. Operating Modes:
cool, ice build. States: alarm, run enabled, local control, limited,
CHW flow, cond flow.
Leaving
Condenser Water
Temperature
analog temperature SNVT_temp_p
Alarm
Description
See note 2 SNVT_str_asc
Chiller Status See note 3 SNVT_chlr_status
Profile Description
Supported
Profile
BACnet Advanced Application Controller (B-AAC)
BACnet Application Specific Controller (B-ASC) ü
BACnet Building Controller (B-BC)
BACnet Operator Workstation (B-OWS)
BACnet Smart Actuator (B-SA)
BACnet Smart Sensor (B-SS)
Table 45. LonTalk points list (continued)
LonTalk Communications Interface
Notes:
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 Mode: 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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