Field Installed Control Wiring; Controls Using 115 Vac; Controls Using 24 Vac; Controls Using Dc Analog Input/Outputs - Trane IntelliPak CG-SVX02B-EN Installation & Operation Manual

Field Installed Control Wiring

Before installing any connecting wiring, refer to Figure 2 for
the electrical access locations provided on the unit. Install
appropriately sized control wiring for the 115 volt electrical
components as required by the application.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote discon-
nects before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be inadvert-
ently energized. Failure to disconnect power before ser-
vicing could result in death or serious injury.
Since the unit-mounted 115V control power transformer
(1T1) and the 24V control power transformers (1T2, 1T3,
1T4) is provided on all units, it is not necessary to run a
separate 115 volt control circuit power source to the unit.
A separate field provided 15 Amp maximum 115V 60 Hz or
240V 50 Hz power source is required when the unit is
equipped with heat tape. Refer to the wiring diagrams that
shipped with the unit for proper connections.
Note: All field wiring must conform to NEC
guidelines as well as state and local codes.

Controls Using 115 VAC

Install appropriately sized 115 volt control wiring for the fol-
lowing electrical components.
Circulating Pump Interlock
Pump interlock wiring is the responsibility of the installer.
During compressor operation, the solution flow through the
chiller must be maintained. The field provided; 5S1 discon-
nect switch, 5K1 pump starter, 5K1 overloads (OL's) must
be installed and properly wired as part of the system's inter-
lock circuit. Maximum contact rating @ 115 VAC is 1 amp
inductive. A Solution Pump binary output (Form A) relay is
located on the CGM which may be used to control the
chiller solution pump. Refer to the illustrations in Figures 11
and 12A for the typical "field wiring" interlock diagrams.

Controls using 24 VAC

Before installing any connecting wiring, refer to Figure 2 for
the electrical access locations provided on the unit and
Table 5 for AC conductor sizing guidelines, and;
a. Use copper conductors unless otherwise specified.
b. Ensure that the AC control wiring between the
controls and the unit's termination point does not
exceed three (3) ohms/conductor for the length of
the run.
Note: Resistance in excess of 3 ohms per
conductor may cause component failure due to
insufficient AC voltage supply.
c. Be sure to check all loads and conductors for
grounds, shorts, and miswiring.
Installation
d. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
Install appropriately sized 24 volt AC/DC control wiring for
the electrical components as required by the application.
These components may include:
Remote Running/Alarm Indicator
External Auto/Stop
Flow Control Interlock
Table 5
AC Conductors
Distance from Unit Recommended
to Control
000 - 460 feet
461 - 732 feet
733 - 1000 feet
Remote Running/Alarm Indicator (Optional)
If the remote run indication and alarm contacts are used, a
24 VAC control circuit must be provided between the Re-
mote Running/Alarm Indicator panel and the appropriate
terminals located at the UCM. Maximum contact rating @
24 VAC is 10 Amp inrush and 3.2 Amp sealed. Refer to the
"field wiring" diagrams illustrated in Figure 12A. Provide a
proper remote panel ground connection.
External Auto/Stop (Optional)
If the unit utilizes an optional remote Auto/Stop function, the
installer must provide control wiring from the remote pump
relay contacts (5S67) to the appropriate terminals on 1TB4
terminal board.
When this set of contacts opens, the UCM reads it as a
command to stop chiller operation and begin the pumpdown
cycle (if enabled).
Circuit requirements are 2-wire, 24 VDC; w/maximum con-
tact rating 12 mA. Refer to the field wiring diagram illus-
trated in Figure 12A for the termination points.
Flow Control Interlock (6S1)
The required flow switch is a binary output device and is
wired within the interlock circuit providing (required) chilled
water flow interlock diagnostic for the system. Before install-
ing the control wiring, refer to Figure 2 for the electrical ac-
cess into the control panel. Refer to the field connection
diagram for the specific connection points.
Provide a proper ground for all control circuitry at the
ground connection screws provided within the unit's control
panel.

Controls using DC Analog Input/Outputs

(Standard Low Voltage Multiconductor Wire)
Before installing any connecting wiring between the unit
and components utilizing a DC analog input\output signal,
refer to Figure 2 for the electrical access locations provided
on the unit.
a. Table 6 lists the conductor sizing guidelines that
must be followed when interconnecting the DCbinary
output devices and the system components utilizing
a DC analog input\output signal to the unit.
33
Wire Size
18 gauge
16 gauge
14 gauge