York DM 078 manual Additional Factory Installed Options

outdoor and return air damper assembly to prevent the supply air temperature from dropping below 55 ºF. Changeover from compressor to economizer operation shall be provided by an integral electronic enthalpy con- trol 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 or power exhaust.

2.MOTORIZED OUTDOOR AIR DAMPERS – Outdoor and return air dampers that are interlocked and posi- tioned by a 2-position,spring-return damper actuator. The maximum leakage rate for the outdoor air intake dampers shall not exceed 2% when dampers are fully closed and operating against a pressure differential of 0.5 IWG. 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 ventila- tion 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 posi- tions – 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 appli- cations with high restrictions, units are available with optional indoor blower motors that provide higher static output and/or higher airflow.

•CONVENIENCE OUTLET (POWERED/NON-POW- ERED) – 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 - 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 elec- tric heat available.

•STAINLESS STEEL HEAT EXCHANGER – For applica- tions in a corrosive environment, this option provides a full stainless steel heat exchanger assembly.

•STAINLESS STEEL DRAIN PAN – Provides years of trouble-free operation in corrosive environments.

•SMOKE DETECTOR – A smoke detector can be factory mounted and wired in the supply and/or return air com- partments.

OTHER PRE-ENGINEERED ACCESSORIES AVAILABLE

•ROOF CURB - 14” and 8” 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.

•–60 ºF GAS HEAT KIT – Provides an electric heat kit for the gas compartment for use in extreme low ambient conditions.

•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.

Subject to change without notice. Printed in U.S.A.	246645-YTG-C-0708
Copyright © 2008 by Johnson Controls, Inc. All rights reserved.	Supersedes: 246645-YTG-B-0606

Johnson Controls Unitary Products

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Norman, OK 73069