York Predator DF 078 Technical Manual page 7

economizer is 2% low leakage type. 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 econo-
mizer control accepts an optional CO
ventilation.With single enthalpy input, the economizer
control monitors outdoor air. The dual enthalpy kit pro-
vides a second input used to monitor the return air. With
a dual input kit installed, the economizer control com-
pares the values of the two enthalpy or temperature
inputs and positions the dampers to provide the maxi-
mum efficiency possible
• Horizontal Economizer - (Without barometric relief) -
All features of the downflow economizer exist except you
must order the duct mount barometric relief separately.
You must order a 1EH0408 if you are installing a
power exhaust. You can order a 1RD0411 Barometric
Relief for horizontal flow economizers only.
• Slab Economizer for Energy Recovery Ventilator-
(Without barometric relief or Fresh Air Hood) - The
economizer is provided with a single enthalpy input. The
economizer is 2% low leakage type. 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 econo-
mizer control accepts an optional CO
ventilation. With single enthalpy input, the economizer
control monitors outdoor air. The dual enthalpy kit pro-
vides a second input used to monitor the return air. With
a dual input kit installed, the economizer control com-
pares the values of the two enthalpy or temperature
inputs and positions the dampers to provide the maxi-
mum efficiency possible.
You can order 1EH0409 Barometric Relief/FA Hood
for field installations without an ERV.
• Dual Enthalpy Control, Accessory - This kit contains
the required components to convert a single enthalpy
economizer to dual enthalpy.
• Barometric Relief Damper - Zero to 100% capacity
barometric relief dampers for use with horizontal flow, or
field installed slab economizers.
• Power Exhaust - This accessory installs in the unit with
a down flow economizer. Power exhaust plugs into the
connector in the unit bulkhead. You must purchase
1EH0408 barometric relief when applying to a hori-
zontal flow application.
• Manual Outdoor Air Damper - Like the motorized out-
door air damper, each manual outdoor air damper
Johnson Controls Unitary Products
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input for demand
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input for demand
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includes a slide-in damper assembly with an outdoor air
hood and filters. Customers have a choice of dampers
with ranges of 0% to 100% or 0% to 35% outdoor air
entry.
Motorized Outdoor Air Damper - The motorized out-
door air damper includes a slide-in/plug-in damper
assembly with an outdoor air hood and filters. The out-
door 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.
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.
CO Sensor - Senses CO
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overrides the economizer when levels rise above the
preset limits.
Dirty Filter Switch - This kit includes a differential pres-
sure switch that energizes the fault light on the unit ther-
mostat, indicating that there is an abnormally high
pressure drop across the filters.
Coil Guard - Field installed decorative wire coil guard.
Hail Guard - This kit includes a sloped hood which
installs over the outside condenser coil and prevents
damage to the coil fins from hail strikes. Field installed
accessory only.
Electric Heaters - The electric heaters range from 9 kW
to 54kW and are available in all the voltage options of the
base units. All heaters are dual staged. Cooling units
include an adapter panel for easy installation of the elec-
tric heaters. Necessary hardware and connectors are
included with the heaters. All heaters are intended for
single point power supply.
Metal Frame Filter Kit - Metal frame with polyester filter
medium.
Permanent Filters - Permanent filters are available.
Roof Curbs - The roof curbs have insulated decks and
are shipped disassembled The roof curbs are available
in 8" and 14" heights. For applications with security con-
cerns, burglar bars are available for the duct openings of
the roof curbs.
Roof Curb Transition - Single Piece Adapter (10" High)
- Roof curbs for transitioning from Sunline
®
Predator units. Fits 7.5 to 12.5 Sunline
only.
Burglar Bars - Mount in the supply and return openings
to prevent entry into the duct work.
Thermostat - The units are designed to operate with 24-
volt electronic and electro-mechanical thermostats. All
units (with or without an economizer) operate with two-
stage heat/two-stage cool or two-stage cooling only ther-
mostats, depending upon unit configuration.
246699-YTG-D-1208
levels and automatically
2
TM
units to
TM
roof curbs
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