York D3CE, D3CG manual Field-Installedaccessories, Table Of Contents

530.26-TG3YI

FIELD-INSTALLED ACCESSORIES

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.

On units built prior to January 1995 an accessory field harness must be installed.

Power exhaust is not available as a field installed option.

DUAL 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.

This enthalpy system contains one sensor that monitors the outdoor air and one sensor that monitors the return air. The logic module compares the two values and modulates the dampers, providing the maximum efficiency of the economizer system.

The rain hood is painted to match the basic unit and must be field-assembled before installing.

On units built prior to January 1995 an accessory field harness must be installed.

Power exhaust is not available as a field installed option.

MOTORIZED OUTDOOR AIR INTAKE DAMPER - Includes a slide-in /plug-in damper with a 2-position,spring-return motor actuator which opens to a pre-set position whenever the supply air blower is operating and drives fully closed when the blower shuts down.

On units built prior to January 1995 an accessory field harness must be installled.

Power exhaust is not available as a field installed option.

BAROMETRIC RELIEF DAMPER - This damper accessory can be used to relieve internal air pressure on units with an economizer. This accessory includes a rain hood, a bird screen and a fully assembled damper. With bottom duct connections, the damper should be mounted over the opening in the return air panel. With horizontal ductwork, the accessory should be mounted on the return air duct.

ROOF CURBS - Roof curbs, 356mm (14 in.) high, provide a water-tight seal between the unit and the finished roof. These full perimeter curbs meet the requirements of the National Roofing Contractors Association (NRCA) and are shipped knocked-down for field assembly. They’re designed to fit inside the base rails of the unit and include both a wood nailing strip and duct hanger supports.

SIDE DUCT FLANGES - Twenty-five millimeter (1 in.) flanges replace the supply and return air panels on the rear of the unit to accommodate horizontal duct connections. These flanges can also be used individually for bottom supply/horizontal return or horizontal supply/bottom return.

HIGH SPEED DRIVE - A smaller blower pulley, a larger motor pulley (including a replacement belt) increase the speed of the supply air blower for applications with a higher airflow and/or static pressure requirement.

ANTI-RECYCLE TIMERS - Two solid state timers prevent the compressors from short-cycling. Once a compressor is de-energized, it remains de-energized for approximately five minutes.

LOW AMBIENT CONTROLS TO 18°C (0°F) - An autotransformer and a thermostat maintain stable system operation by reducing the speed of the #1 condenser fan motor at low oudoor temperatures. The kit also includes a 1-phase motor to replace the unit’s standard 3-phase condenser fan motor. Standard units can operate down to 4 °C (25 °F).

TABLE OF CONTENTS

Description	1	Electrical Data - Cooling and Gas Heat	13
Field-Installed Accessories	2	Electrical Data - Units with Electric Heat	14
Ratings	3	Physical Data	14
Cooling Capacities	4
		Unit Dimensions	15
Blower Performance	8
		Roof Curb Dimensions	18
Blower Motor and Drive Data	12
		Typical Applications	18
Static Resistances	10
Field Wiring	13

2 Unitary Products Group