York R-410A User Manual download pdf (Page 6)

528194-YTG-F-1210

6 Johnson Controls Unitary Products

•Slab Economizer for Energy Recovery Ventilators-

(With barometric relief and Fresh Air Hood) - The

economizer is provided with a single enthalpy input. The

economizer is 2% low leakage type, and is shipped

installed and wired. The economizer has spring return,

fully modulating damper actuators and is capable of

introducing up to 100% outdoor air. As the outdoor air

intake dampers open, the return air dampers close. The

changeover from mechanical refrigeration to economizer

operation is regulated by the standard single enthalpy

input. There is an optional input dual dry bulb available.

To meet regulated air standards, the economizer control

accepts an optional CO

input for demand

ventilation.With single enthalpy input, the economizer

control monitors outdoor air. The dual enthalpy kit

provides a second input used to monitor the return air.

With a dual input kit installed, the economizer control

compares the values of the two enthalpy or temperature

inputs and positions the dampers to provide the

maximum efficiency possible.

• Power Exhaust (Downflow only) - This accessory

installs in the unit with a down flow economizer.

• Motorized Outdoor Air Damper - The motorized outdoor

air damper includes a slide-in/plug-in damper assembly

with an outdoor air hood and filters. The outdoor air

dampers open to the preset position when the indoor fan

motor is energized. The damper has a range of 0% to

100% outdoor air entry. Factory installed option or field

installed accessory.

• Alternate Indoor Blower Motor - For applications with

high static restrictions, units are offered with optional

indoor motors that provide higher static output and/or

higher airflow, depending upon the installer’s needs.

• Variable Air Volume (VAV); 6-1/2 through 12-1/2 ton -

A factory-installed variable frequency drive (VFD),

mounted in the Blower Access compartment, is used to

control the speed of the indoor blower motor in order to

maintain a constant static pressure in the supply duct. A

pressure transducer and VAV control board are mounted

inside the control box. The drive comes completely wired

and preprogrammed from the factory.

An optional, factory-installed manual bypass switch

available with factory-installed VFD can be found in the

Blower Motor Access compartment. The switch can be

used to either route power to the VFD for modulating

control of the blower motor, to bypass the drive and

operate the motor at full speed, or to power the drive (and

not the motor) for diagnostic purposes.

Due to space limitations, VAV is not available with any of

the factory-installed BAS options, but is available with

‘BAS-ready’ models. Terminal blocks are provided in the

control box for field wiring of the customer-installed BAS

A ‘VFD-ready’ option provides the provisions for a

customer-installed drive. The unit comes with a mounting

bracket installed in the Blower Access compartment which

may accommodate other vendor’s drives depending on

their size. In order to utilize the unit’s mounting bracket,

the maximum recommended drive dimensions are limited

to approximately 9” H x 5” W x 7.5” D.

If the drive will not fit in the allotted space, then it will have

to be mounted elsewhere; either within the building on a

perpendicular wall which is not subjected to excessive

temperature, vibration, humidity, dust, corrosive gas,

explosive gas, etc., or within an appropriate enclosure

rated for outside installation to safeguard against

moisture, dust and excessive heat. A terminal block

located in the control box is provided for field connection

of the VFD controls.

• Aluminized Steel Gas Heat Exchanger - For

applications in non-corrosive environments.

• Stainless Steel Gas Heat Exchanger - For applications

in corrosive environments, this option provides a full

stainless steel heat exchanger assembly.

• Stainless Steel Drain Pan - An optional rust-proof

stainless steel drain pan is available to provide years of

trouble-free operation in corrosive environments.

• Electric Heaters - The electric heaters range from 9kW to

54kW and are available in all the voltage options of the

base units. All heaters are dual staged. All heaters are

intended for single point power supply.

• Disconnect Switch - For gas heat units and cooling units

with electric heat, a HACR breaker sized to the unit is

provided. For cooling only units, a switch sized to the

largest electric heat available for the particular unit is

provided. Factory installed option only.

• Convenience Outlet - (Non-Powered/Powered) - This

option locates a 120V single-phase GFCI outlet with cover,

on the corner of the unit housing adjacent to the

compressors. The “Non-powered” option requires the

installer to provide the 120V single-phase power source and

wiring. The “Powered” option is powered by a stepdown

transformer in the unit. Factory installed option only.

• Smoke Detectors - The smoke detectors stop operation

of the unit by interrupting power to the control board if

smoke is detected within the air compartment. Available

for both the supply and/or return air configurations.

• Filters – 2” Pleated MERV 7 or 4” Pleated MERV 13 are

available to meet LEED requirements. A 2” Throwaway is

shipped as standard.

• Phase Monitors - Designed to prevent unit damage. The

phase monitor will shut the unit down in an out-of phase

condition. (Standard on units with Scroll Compressors.)

• Coil Guard - Customers can purchase a coil guard kit to

protect the condenser coil from damage. Additionally, this

kit stops animals and foreign objects from entering the

space between the inner condenser coil and the main

cabinet. This is not a hail guard kit.

Factory-installed smoke detectors may be subjected to

extreme temperatures during "off" times due to outside air

infiltration. These smoke detectors have an operational

range of -4 °F to 158°F. Smoke detectors installed in areas

that could be outside this range will have to be relocated to

prevent false alarms.

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York R-410A User Manual Page 6

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