Electric Heating Section; Unit Operating Characteristics; Additional Factory Installed Options; Factory Installed Optional Outdoor Air - York Predator ZF120 Technical Manual

bustion with post purge logic, energy saving direct spark igni-
tion, and redundant main gas valve. The heat exchanger shall
be of the tubular type, constructed of T1-40 aluminized steel for
corrosion resistance and allowing minimum mixed air entering
temperature of 40 ºF. Burners shall be of the in-shot type, con-
structed of aluminum-coated steel. All gas piping shall enter the
unit cabinet at a single location, through either the side or bot-
tom, without any field modifications. An integrated control board
shall provide timed control of evaporator fan functioning and
burner ignition. Heating section shall be provided with the fol-
lowing minimum protection:
a. Primary and auxiliary high-temperature limit switches.
b. Induced draft pressure sensor.
c. Flame roll out switch (manual reset).
d. Flame proving controls.
e. All two stage units shall have two independent stages of
st
capacity (60% 1 stage, 100% 2
ELECTRIC HEATING SECTION (IF EQUIPPED)
An electric heating section, with nickel chromium elements,
shall be provided in a range of 9 thru 54 KW, offering two states
of capacity all sizes. The heating section shall have a primary
limit control(s) (automatic reset) to prevent the heating element
system from operating at an excessive temperature. The Heat-
ing Section assembly shall slide out of the unit for easy mainte-
nance and service. Units with Electric Heating Sections shall be
wired for a single point power supply with branch circuit fusing
(where required).

UNIT OPERATING CHARACTERISTICS

Unit shall be capable of starting and running at 125 ºF outdoor
temperature, exceeding maximum load criteria of AHRI Stan-
dard 340/360. The compressor, with standard controls, shall be
capable of operation down to 0 ºF outdoor temperature. Unit
shall be provided with fan time delay to prevent cold air delivery
before heat exchanger warms up. (Gas heat only)
ELECTRICAL REQUIREMENTS - All unit power wiring shall
enter unit cabinet at a single factory provided location and be
capable of side or bottom entry to minimize roof penetrations
and avoid unit field modifications. Separate side and bottom
openings shall be provided for the control wiring.
STANDARD LIMITED WARRANTIES - Compressor – 5 Years,
Heat Exchanger – 10 Years, Elect. Heat Elem. – 5 Years,
Parts – 1 Year
FACTORY INSTALLED OPTIONAL OUTDOOR AIR (Shall be
made available by either/or):
• DRY BULB AUTOMATIC ECONOMIZER - Outdoor and
return air dampers that are interlocked and positioned by
a fully-modulating, spring-return damper actuator. The
maximum leakage rate for the outdoor air intake dampers
shall be designed to meet ASHRAE 90.1-2010, AMCA
511 Class 1A damper, and the International Energy
Conservation Code (IECC) certification requirements by
achieving leakage rates of 3 cfm/sq. ft. at 1" of static
Johnson Controls Unitary Products
nd
stage).
pressure. Changeover from compressor to economizer
operation shall be provided by an integral electronic
enthalpy control that feeds input into the basic module.
The outdoor intake opening shall be covered with a rain
hood that matches the exterior of the unit. Water
eliminator/filters shall be provided.
Simultaneous economizer/compressor operation is also
possible. Dampers shall fully close on power loss.
Available with barometric relief and power exhaust.
• MOTORIZED OUTDOOR AIR DAMPERS - Outdoor and
return air dampers that are interlocked and positioned by
a 2- position, spring-return damper actuator. A unit-
mounted potentiometer shall be provided to adjust the
outdoor and return air damper assembly to take in the
design CFM of outdoor air to meet the ventilation
requirements of the conditioned space during normal
operation. Whenever the indoor fan motor is energized,
the dampers open up to one of two pre-selected positions
- regardless of the outdoor air enthalpy. Dampers return to
the fully closed position when the indoor fan motor is de-
energized. Dampers shall fully close on power loss.

ADDITIONAL FACTORY INSTALLED OPTIONS

• ALTERNATE INDOOR BLOWER MOTOR – For
applications with high restrictions, units are available with
optional indoor blower motors that provide higher static
output and/or higher airflow.
• Variable Air Volume (VAV) – The VAV option using a
variable frequency drive (VFD) shall be available on 6.5
through 12.5 ton, models for applications requiring a
constant supply-duct static pressure. Units equipped for
VAV shall be controlled by a duct pressure transducer
with a 0 - 5" WC pressure range. The pressure transducer
shall provide a 0 - 5 VDC output signal to a VAV control
board which, in turn shall provide a 2 - 10 VDC speed
reference signal to the VFD. The VAV control board shall
operate using factory-installed Supply Air, Return Air and
Outside Air Temperature Sensors with a nominal
resistance of 10,000 Ohms. Units equipped with VFD's
shall have factory-installed manual bypass as an option.
• CONVENIENCE OUTLET (POWERED/NON-POWERED)–
Unit can be provided with an optional 120VAC GFCI outlet
with cover on the corner of the unit housing the compressors.
• ELECTRIC HEAT - Electric Heaters range from 9 kW to
54 kW and are available in all the voltage options of the
base unit.
• PHASE MONITOR - Designed to prevent damage in out-
of-phase condition.
• COIL GUARD - Designed to prevent condenser coil
damage.
• BAS CONTROLS HARDWARE - Include supply air
sensor, return air sensor, dirty filter indicator and air
proving switch.
• 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.
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