Space Temperature / Rh Sensor (Optional); High Temperature Sensor; Outdoor Air Temperature And Relative Humidity Sensor; Control Input (Occupied / Unoccupied) - Trane Horizon OADG Series Installation, Operation And Maintenance Manual

General Information
On dual circuit units, if the high pressure control opens,
the compressor on the affected circuit is locked out. A
manual reset for the affected circuit is required.

Space Temperature / RH Sensor (Optional)

Field installed, wall mounted combination temperature/
humidity sensor (BAYSENS036A) to control space cooling,
heating and dew point.

High Temperature Sensor

The Discharge Air Temperature Sensor (DTC) supplies a
continuous signal to the MCM. Factory setting for
Discharge Air Temperature (DTC) Discharge Air
Temperature Setpoint (MDTS) is 90°F (adj 70–100°F), the
unit will be shut down, and require a manual restart if
Discharge Air Temperature exceeds MDTS for 10 minutes
(adj 10–25 minutes). If DAT exceeds Discharge Air High
Temperature Cutoff (DHCS) of 125°F for 10 minutes, the
unit will shut down and require manual restart.
Outdoor Air Temperature and Relative
Humidity Sensor
This factory installed combination outdoor air sensor
located in the outdoor air hood is designed to sense both
outdoor air temperature and relative humidity for use by
the microprocessor controller to make required
ventilation, cooling, dehumidification and heating
decisions.

Control Input (Occupied / Unoccupied)

Terminals are provided on the terminal strip labeled
OAUTS for a field installed dry contact or switch closure to
put the unit in the Occupied or Unoccupied modes.

Hot Gas Reheat

This option shall consist of a hot-gas reheat coil located on
the leaving air side of the evaporator.
100 Percent Outdoor Air Hood with
Damper and Filters
Factory-installed and -integrated 100 percent outdoor air
hood with damper controlled by a direct coupled actuator
and 2 in. (50.80 mm) permanent and washable aluminum
mesh filters (mist eliminators) removable through a
hinged access panel. The unit can be factory provided with
an optional 100 percent return air damper controlled by a
direct coupled actuator that is electrically interlocked with
the outdoor air damper.

Modulating Indirect Fired Gas Burner

The unit will have fully modulating, high turndown,
indirect fired gas heat. The heating section will include
high turn-down burners and a stainless steel tubular heat
exchanger. The heat exchanger will be constructed of
type 439 stainless steel and be a tubular design capable of
draining internal condensate. External flue to be
constructed of type 430 stainless steel.
12
Units will be suitable for use with natural gas or Liquid
Propane (LP) gas.
Through the Base Electrical with
Disconnect Switch
Factory installed 3-pole, molded case disconnect switch
with provisions for through the base electrical connections
will be included. The disconnect switch, with integral
overcurrent circuit breaker, will be installed in the unit in a
water tight enclosure with access through a hinged door.
Factory wiring will be provided from the switch to the unit
high voltage terminal block. The switch will be UL/CSA
agency recognized.

Hinged Access Doors

Hinged access doors with hold open brackets will be
factory-installed.

Modulating Electric Heat

The unit may have four stage or fully modulating SCR
controlled electric heat. The primary heating section will
include open coil heating elements, automatic and manual
cut-outs, low voltage controls, air proving switch,
maximum 48 amps per circuit and fusing for heaters over
48 amps. For ductwork installation, refer to
p. 27.
"Ductwork,"
OAU-SVX006C-EN