Trane R Series Installation Operation & Maintenance page 45

RTAC-SVX002A-EN
Installation Electrical
When the chiller is not running the CWS
is reset immediately (within one minute)
for Return Reset and at a rate of 1
degree F every 5 minutes for Outdoor
Reset. The chiller will start at the
Differential to Start value above a fully
reset CWS or CWS' for both Return and
Outdoor Reset.
Communications Interface options
Optional Tracer Communications
Interface
This option allows the Tracer CH530
controller to exchange information (e.g.
operating setpoints and Auto/Standby
commands) with a higher-level control
device, such as a Tracer Summit or a
multiple-machine controller. A shielded,
twisted pair connection
the bi-directional communications link
Tab. IV-05 – Wire Size
Wire Size
14 AWG (2.5 mm2)
16 AWG (1.5 mm2)
18 AWG (1.0 mm2)
• 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)
CH530 provides an optional LonTalk
Communication Interface
between the chiller and a Building
Automation System (BAS). An LCI-C
LLID shall be used to provide "gateway"
functionality between
compatible device and the Chiller.
The inputs/outputs include
mandatory and optional
variables as established by the LonMark
Functional Chiller Profile 8040.
Installation Recommendations
• 22 AWG Level 4
communication wire recommended for
most LCI-C installations
• LCI-C link limits: 4500 feet, 60 devices
between the Tracer CH530 and the
building automation system.
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
accordance with the NEC and local
codes.
• Communication
must be shielded, twisted pair wiring
(Belden 8760 or equivalent). See the
table below for wire size selection:
establishes
Maximum Length of Communication Wire
5,000 FT (1525 m)
2,000 FT (610 m)
1,000 FT (305 m)
• 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
(LCI-C)
additional 4500 feet, 60 devices, 8
communication stubs
a LonTalk
both
network
unshielded
wiring must be in
link wiring
45