Trane RTAC 150 Series

RTAC-SVX002A-EN 45
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 establishes
the bi-directional communications link
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 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:
Tab. IV-05 – Wire Size
Wire Size Maximum Length of Communication Wire
14 AWG (2.5 mm2) 5,000 FT (1525 m)
16 AWG (1.5 mm2) 2,000 FT (610 m)
18 AWG (1.0 mm2) 1,000 FT (305 m)
• The communication link cannot pass
between buildings.
• All units on the communication
link can be connected in a “daisy
chain”conguration.
LonTalk Communications Interface for
Chillers (LCI-C)
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 Prole 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