Additional Factory-Installed Options; Other Pre-Engineered Accessories Available - York ZT SERIES Technical Manual

5167821-YTG-K-1118
• 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, 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 in. of static 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

• MagnaDry dehumidification system- removes humidity while maintaining comfort cooling. Available on 6.5 to 12.5 ton units
only.
• 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.
• Convenience outlet (powered or 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 3kW to 54kW 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.
• Breaker – An HACR breaker can be factory installed on gas heat units or cooling units with electric heat.
• Disconnect switch - A disconnect can be factory installed on a cooling only units sized for the largest electric heat available.
• Stainless steel heat exchanger – For applications in a corrosive environment, this option provides a full stainless steel heat
exchanger assembly.
• Smoke detector – A smoke detector can be factory mounted and wired in the supply and/or return air compartments.

Other pre-engineered accessories available

• Roof curb - 14-inch and 8-inch high, full perimeter knockdown curb, with hinged design for quick assembly.
• Barometric relief damper – (Unit mounted – Downflow, Duct Mounted – Horizontal) – Contains a rain hood, air inlet screen, exhaust
damper and mounting hardware. Used to relieve internal air pressure through the unit during economizer operation.
• Propane conversion kit – Contains new orifices and gas valve springs to convert from natural to L.P. gas.
• Economizer (Downflow and Horizontal flow)
• Power exhaust – (Unit mount – Downflow, Duct mount – Horizontal flow)
• Dual enthalpy kit - Provides a second input to economizer to monitor return air.
16 Johnson Controls Ducted Systems