York WR300, WR240 warranty Factory-Installedoptions, Single Input Electronic Enthalpy

	262292-YTG-B-0107
FACTORY-INSTALLED OPTIONS	A ‘VFD-ready’ option provides the provisions for a cus-
• SINGLE INPUT ELECTRONIC ENTHALPY	tomer-installed drive. The unit comes with a mounting
	bracket installed in the Blower Access compartment which
ECONOMIZERS - Includes a slide-in / plug-in damper	may accommodate other vendor’s drives depending on
assembly with fully modulating spring-return motor	their size. In order to utilize the unit’s mounting bracket,
actuator capable of introducing up to 100% outdoor air	the maximum recommended drive dimensions are as fol-
with nominal 1% leakage type dampers.	lows:
The enthalpy system contains one sensor that monitors	For 5-hp motor applications ........................13” H x 6” W x 7” D
the outdoor air and determines when the air is cool
	For 7.5 thru 15-hp motor applications .........13” H x 8” W x 8” D
enough and dry enough to provide free cooling.
The rainhood is painted to match the basic unit and must	If the customer-installed drive will not fit in the allotted
be field-assembled before installing.	space, then it will have to be mounted within a NEMA-4
• POWER EXHAUST - Our single economizer options are	enclosure for outside installation or inside the building on
	a perpendicular wall not subjected to excessive tempera-
available with power exhaust. Whenever the outdoor air
	ture, vibration, humidity, dust, corrosive gas, explosive
intake dampers are opened for free cooling, the exhaust
	gas, etc.
fan will be energized to prevent the conditioned space
from being over-pressurized during economizer operation.	A terminal block located in the control box is provided for
The exhaust fan, motor and controls are installed and	field connection of the VFD controls.
wired at the factory. The rain hood must be assembled	• HOT GAS BYPASS - To allow for low cooling load opera-
and installed in the field.
	tion, a direct-acting pressure-modulating bypass control
• MOTORIZED OUTDOOR AIR INTAKE DAMPER -
	valve installed on the system #1 discharge line is used to
Includes a slide-in / plug-in damper assembly with a 2-
	divert high temperature, high pressure refrigerant around
position, spring return motor actuator which opens to a
	the TXV in order to maintain a desired minimum evaporator
pre-set position whenever the supply air blower is
	pressure. HGBP is standard on all units with VAV and
operating and will drive fully closed when the blower unit
	optional with CV units.
shuts down.
	• FILTER OPTIONS - Standard units are shipped with 2”
The rain hood is painted to match the basic unit and must
	throw-away filters installed. 2” pleated and 4” pleated
be field assembled before installing.
	filters are offered as a factory installed option.
• PHENOLIC COATED EVAPORATOR, REHEAT, AND
	• CONVENIENCE OUTLET - This 110 volt outlet can be
CONDENSER COILS - Special coating process that
	“powered” by the unit with a stepdown transformer or you
utilizes Technicoat 10-1" processes. Coating is applied by
	may order the unit with a “non-powered” convenience
total immersion of the complete coil for maximum
	outlet that can be wired in the field.
protection.
	• DISCONNECT SWITCH - For gas heat units and cooling
• ELECTRIC HEATERS wired for single point power
	units with electric heat, a HACR breaker sized to the unit
supply. These nickel chromium heater elements are
	is provided. For cooling only units, a switch sized to the
provided with limit and automatic reset capability to
	largest electric heat available for the particular unit is
prevent operation at excessive temperatures.
	provided. Factory installed option only.
• VARIABLE AIR VOLUME (VAV) - A factory-installed
	• DOUBLE WALL CONSTRUCTION - Optional double wall
variable frequency drive (VFD), mounted in the Blower
	construction is available to provide smooth inner surfaces
Access compartment, is used to control the speed of the
	for easy and effective cleaning to reduce risk of dirt and
indoor blower motor in order to maintain a constant static
	bacterial accumulation. Fiberglass insulation is
pressure in the supply duct. A pressure transducer and
	sandwiched between heavy gauge steel sheets to form a
VAV control board are mounted inside the control box.
	durable, rigid casing to withstand higher working
The drive comes completely wired and pre-programmed
	pressures and impact forces. The heavy-duty construction
from the factory.
	provides excellent acoustic and thermal insulation and
An optional, factory-installed manual bypass switch avail-
	eliminates erosion of insulation material and
able with factory-installed VFD can be found in the Blower	contamination of the air stream.
Motor Access compartment. The switch can be used to	• BAS - Building Automation System Controls
either route power to the VFD for modulating control of the
	(available on two-system cooling product only).
blower motor, to bypass the drive and operate the motor
	Simplicity® INTELLI-Comfort™ CONTROL - The York®
at full speed, or to power the drive (and not the motor) for
diagnostic purposes.	Simplicity® INTELLI-Comfort™ control is factory installed.
	It includes a supply air sensor, a return air sensor, and an
Due to space limitations, VAV is not available with any of
	outside air sensor. There are provisions for a field installed
the factory-installed BAS options described below, but is	dirty filter indicator switch, an air-proving switch, an Out-
available with ‘BAS-ready’ models. Terminal blocks are	side Air Humidity sensor, a Return Air Humidity sensor, an
provided in the control box for field wiring of the customer-	Inside IAQ sensor, and an Outside Air IAQ sensor. Con-
installed BAS.

8 Unitary Products Group