Trane HUV Installation, Operation And Maintenance Manual page 46

ECM Overview and Setup
• Wall-mounted low-voltage fan speed switch inputs to
the adapter boards' terminal strips and 24 Vac tap to
field-installed fan speed switch.
• Field-supplied controllers/thermostats to the adapter
boards' terminal strips and 24 Vac power tap to
field-supplied controller/thermostat.
• Adjustment and calibration of the variable speed
inputs (VSP/0–10V) on the system.
• Adjustment, calibration or disabling of the optional
auto-changeover function on CSTI units.
Otherwise, proceed with the mechanical, electrical and
controls installations as defined in other sections of this
manual, while obeying the warnings communicated in this
section.
Proceed with the power on after installation, as defined in
the other sections of UNT-SVX07B-EN.
Wall Mounted Low Voltage Fan Speed Switch/
Customer-Supplied Controller/Thermostat
Instructions
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by Trane
or others, refer to the appropriate manufacturer's
literature for allowable waiting periods for discharge of
capacitors. Verify with an appropriate voltmeter that all
capacitors have discharged. Failure to disconnect
power and discharge capacitors before servicing could
result in death or serious injury.
WARNING
Safety Alert!
You MUST follow all recommendations below. Failure
to do so could result in death or serious injury.
• Hook ups to the adapter boards should be made only
with the power off to the unit.
• Only connect Class 2 voltages to the terminal blocks
on the adapter boards that share a common with the
unit mounted low-voltage transformer.
• Secure low voltage connections firmly to terminal
strips, and strain-relieve all low voltage connection to
prevent accidental detachment and possible short-
circuiting of high voltage components. Care should
be taken to avoid contact of low voltage wiring to the
back side of the adapter boards, which contain high
voltage.
46
Note: Specifications subject to change without notice.
Consult the unit submittals and unit schematics
before determining hookup requirements to the
fan-coil unit. Terminal block positions, polarities
and assignments are determined for specific unit
configurations only. Signal assignments are
indicated, for reference only.
Both adapter boards come equipped with integrated
terminal blocks to hook up to the field supplied/mounted
Fan Speed Switches and external controls. Connections
should be made to the screw terminals with wires between
16 AWG and 24 AWG, with a ~4–5-mm wire strip length.
The terminal blocks have 5-mm spacing, and are equipped
with 3-mm screws. The field-supplied wires should have
an insulation rating of 600V.
Standard Adapter Board Field Connections
Figure 43. Standard adapter board field connections
3 2 1
1. VSP 10V
2. VSP 0–10V
3. VSP DC COM
All customer connections to the two adapter boards are
made to the terminal strips on both adapter boards.
Screw terminal blocks provide convenient access to fan
controls for High, Medium, Low, and Variable speed. In
addition, a courtesy 10 Vdc supply is provided for use with
an external potentiometer or rheostat. The 10 Vdc supply
supports up to 10 mA draw.
TB3 (right five positions) is normally used to provide 24V
hookup to a wall mounted fan speed switch, and to accept
the returns from the switch for High, Medium, and Low
requests.
TB4 (left three positions) is normally used to control the
system with a 0–10 Vdc output from a thermostat/
controller, or a fan control rheostat/potentiometer.
The terminal block functional assignments and polarity
are shown for reference only, and the schematics that ship
with each unit should be consulted before wiring. Wiring
assignments are configured for each unit.
5 4 3 2 1
1. 24 Vac Y (gnd)
2. 24 Vac B (com)
3. High
4. Medium
5. Low
UV-SVN02C-EN