Trane HUV Installation Operation & Maintenance page 24

End Device Package
The direct digital control (DDC)
end device package is a prewired
control offering of selected control
components. This allows any con-
trol vendor to easily interface with
the Trane unit ventilator.
The DDC end device package con-
sists of the following components
which are factory wired to a termi-
nal strip that is located in the left
hand end pocket of the unit venti-
lator. The unit is shipped from the
factory with a UL listing. See Fig-
ure 24 for end device controls.
• A NEC Class 2 type trans-
former with a primary side
of 120 VAC and a secondary
side of 24 VAC at 90 VA. The
transformer is manually re-
settable.
• The fan start/stop relay is a
double pole/double throw
relay rated for 20-amps at
120/240 VAC.
• A 10-pole terminal block is
rated for 20-amps at 300
volts.
• An optional low temperature
detection thermostat has a
vapor pressure type element
strung along the face of the
coil. If one inch of this ele-
ment falls below 38-degrees
F, it is designed to shut the
outside air damper and turn
off the fan motor. The device
is manually reset and has a
contact rating of 8.3 FLA at
240 volts.
2 4
Controls
End Device Package
Once the basic package is select-
ed, the following options are also
available:
• Control valve(s). 3-point
floating ONLY. 2-way and 3-
way.
• Face and bypass isolation
valve. 2-position, 2-way
spring return ONLY.
• Face and bypass damper ac-
tuator. 3-point ONLY.
• OA/RA actuator. 3-point float-
ing or 2-10 V available.
• Piping package
Figure 24: End device controls
UV-PRC001-EN