Trane CG-PRC007-EN - Manual (Page 30)

CG-PRC007-EN 30
Controls
(Interface with
Other Control
Systems)
Stand-Alone Unit
Interface to stand-alone units is very
simple; only a remote auto-stop or chilled
water flow interlock signal for scheduling
is required for unit operation. Signals
from the chilled water pump contactor
auxiliary or a flow switch are wired to the
chilled waterflow interlock. Signals from a
time clock or some other remote device
are wired to the external auto-stop input.
Unit controls do not provide an output to
turn pumps on and off.
Required Features
1
External Auto/Stop (Standard)
- or -
2
Chilled Waterflow Interlock (Standard)
Trane Integrated Comfort™ System
Interface
A single twisted pair of wires tied directly
between the CGA unit and a Tracer
system provides control, monitoring and
diagnostic capabilities. Control functions
include auto/stop, compressor operation
lockout for kw demand limiting. In
addition, the Tracer system can provide
sequencing control for two or three CGA
units on the same chilled water loop.
Pump sequencing control can be
provided from the Tracer system also.
Sequencing of two CGA’s can be
accomplished with the DDC Chiller
Sequencer.
Required Features
1
Unit Temperature Controller (Standard)
2
ICS Interface Panel
External Trane Devices Required
1
Tracer
Figure C-2 —Tracer ICS System Interface Schematic
Time clock, manual switch or chilled
water pump contactor auxiliary.
Figure C-1 — Stand-Alone Unit