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80
UNT-SVX07J-EN
Installation - Controls
Control Options
Available control options are:
•
Fan speed control (provided when no control package
is selected)
•
Customer-supplied terminal interface (CSTI)
•
Tracer
®
ZN010 controller
•
Tracer
®
ZN510 controller
•
Tracer
®
ZN520 controller
•
Tracer
®
UC400-B controller with Air-Fi® Wireless
Communications Interface
Fan Speed Control with Standard Adapter
Board
Customer Supplied Terminal Interface
(CSTI)
The control interface is intended to be used with a field-
supplied, low-voltage thermostat or controller. The control
box contains a relay board which includes a line voltage to
24-volt transformer, quiet contactors (for electric heat
units), and an optional disconnect switch. All end devices
are wired to a low-voltage terminal block and are run-
tested, so the only a power connection and thermostat
connection is needed to commission the unit. Entering
water temperature sensors and controls are provided
whenever a change-over coil is selected. When N.O. valves
are selected, inverting relays are provided for use with
standard thermostats.
Figure 57.
Fan speed control
The fan speed control is available for units that do not have Trane factory-
mounted control packages. This variable fan speed option is low-voltage
and has three 24-volt relays using a factory-wired transformer and relays
to control the fan motor.
The adapter allows direct customer interfacing through the use of
terminal strips. Standard interfacing includes:
Variable speed (0–10V) inputs.
The standard adapter board eliminates many separate wiring harnesses
in the panel and allows simple, mistake-proofed single-plug interfacing
of:
•
VelociTach motor control board
•
Transformers
•
Motors
•
Valves
•
Dampers
•
Electric heat control
•
Fan speed control
Figure 58.
Standard adapter board
X1361617010
X13651617020
Customer low-voltage
interface for fan speeds,
variable fan speed, and
24 Vac supply
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