York ZJ Series, Technical Manual

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251933-YTG-B-0806
6 Unitary Products Group
and stainless steel tubular heat exchangers carry a 10-
year warranty.
Factory Installed Options
• Single Input Electronic Enthalpy Economizers -
Includes a slide-in / plug-in damper assembly with fully
modulating spring-return motor actuator capable of
introducing up to 100% outdoor air with nominal 1%
leakage type dampers.
The enthalpy system contains one sensor that monitors
the outdoor air and determines when the air is cool
enough and dry enough to provide free cooling.
The rain hood is painted to match the basic unit and must
be field-assembled before installing.
• Motorized Outdoor Air Intake Damper -Includes a slide-
in / plug-in damper assembly with a 2-position, spring
return motor actuator which opens to a pre-set position
whenever the supply air blower is operating and will drive
fully closed when the blower unit shuts down.
The rain hood is painted to match the basic unit and must
be field assembled before installing.
• Phenolic Coated Evaporator And Condenser Coils -
Special coating process that utilizes Technicoat 10-1
™
processes. Coating is applied by total immersion of the
complete coil for maximum protection.
• Electric Heaters - Wired for single point power supply.
These nickel chromium heater elements are provided with
limit and automatic reset capability to prevent operation at
excessive temperatures.
• Filter Options - Standard units are shipped with 1" throw-
away filters installed. 2" pleated filters are offered as a
factory installed option.
• Convenience Outlet - This 110 volt outlet can be
“powered” by the unit with a stepdown transformer or the
unit may be ordered with a “non-powered” convenience
outlet that can be wired in the field.
• 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.
• Smoke Detectors - (supply air & return air) The smoke
detectors stop operation of the unit by interrupting power
to the control board if smoke is detected within the air
compartment.
• Coil Guard - Customers can purchase a coil guard kit to
protect the condenser coil from damage. This is not a hail
guard kit.
• Stainless Steel Heat Exchanger - For applications in
corrosive environments, this option provides a full
stainless steel heat exchanger assembly.
• Stainless Steel Drain Pan - An optional rustproof
stainless steel drain pan is available to provide years of
trouble-free operation in corrosive environments.
• Bottom Drain Connection - An optional bottom drain
connection is available for inside the curb connections for
applications in cold environments to reduce freezing drain
lines.
• Phase Monitors - Designed to prevent unit damage. The
phase monitor will shut the unit down in an out-of phase
condition.
• Dirty Filter Switch - This kit includes a differential
pressure switch that energizes the fault light on the unit
thermostat, indicating that there is an abnormally high
pressure drop across the filters. Factory installed option or
field installed accessory.
• Hinged Filter Door/”Toolless” Blower And Access
Panels (Not Hinged)
- This option allows for easy access
and maintenance.
NOTE: Knobs are shipped inside the unit to prevent shipping
damage. These must be field installed for tool-less
operation.
Control Options
• BAS - Building Automation System Controls
Simplicity
®
INTELLI-Comfort™ Control - The York® Simplicity
®
INTELLI-Comfort™ control is factory installed. It includes a
supply air sensor, a return air sensor, and an outside air
sensor. There are provisions for a field installed dirty filter
indicator switch, an air-proving switch, an Outside Air
Humidity sensor, a Return Air Humidity sensor, an Inside
IAQ sensor, and an Outside Air IAQ sensor. Construction
mode operation, 365-day real time clock with 7 day
programming plus holiday scheduling is built-in. Two
different modes of demand ventilation are achieved through
the INTELLI-Comfort™ using CO
2
sensors. It uses an
inside CO
2
sensor to perform Demand Ventilation. It can
also use an Outside CO
2
sensor to perform Differential
Demand Ventilation. It uses a Patented Comfort Ventilation
algorithm to provide comfortable ventilation air
temperature. The patented economizer-loading algorithm
will protect the equipment when harsh operating conditions
exist. Humidity in the occupied space or return duct can be
monitored and controlled via humidity sensors and the on-
board connection for hot gas re-heat system. It uses the
INTELLI-Start™ algorithm to maximize energy savings by
recovering the building from the Unoccupied Setpoints to
the Occupied Setpoints just in time for the Occupied Time
Period to begin. The
Simplicity
®
INTELLI-Comfort™
balances space temperature, ventilation air temperature,
CO
2
and humidity for ultimate comfort.
Factory installed smoke detectors in the return air, may
be subjected to freezing temperatures during “off” times
due to out side air infiltration. These smoke detectors
have an operational limit of 32°F to 131°F. Smoke
detectors installed in areas that could be out side those
limitations will have to be moved to prevent having false
alarms.
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