Bryant 604D--A Vertical Economizer Factory Installed Option, General, Accessories, Installation

604D-- -- A

VERTICAL ECONOMIZER

(FACTORY INSTALLED OPTION)

GENERAL

Economizers are recommended for only commercial packaged products that have X13 motors. The Economizer system utilizes the latest technology available for integrating the use of free cooling with mechanical cooling for rooftop units. The solid state control system optimizes energy consumption, zone comfort, and equipment cycling by operating the compressors when the outdoor air temperature is too warm, integrating the compressor with outdoor air when free cooling is available, and locking out the compressor when outdoor air temperature is too cold. Demand ventilation is supported.

The Economizer system utilizes gear-drive technology with a direct-mount spring return actuator that will close upon loss of power. The Economizer system comes standard with an outdoor air temperature sensor, a supply air temperature sensor, and low temperature compressor lockout switch. Indoor enthalpy, outdoor enthalpy, and CO2 sensors are available for field installation.

Barometric relief dampers provide natural building pressurization control. Barometric relief dampers are built into the design and are standard. See Table 10 for Hood Package contents. See Table 11 for sensor usage.

Table 10 – Package Contents

	SMALL CHASSIS		LARGE CHASSIS
	(Sizes 30 and 36)		(Sizes 42, 48, and 60)
Qty	Content Description	Qty	Content Description
1	Hood Side, Right	1	Hood Side, Right
1	Hood Side, Left	1	Hood Side, Left
2	Angle, Filter	2	Angle, Filter
1	Aluminum Filter	1	Aluminum Filter
	(20---1/2” x 16---1/2 x 1”)		(20---1/2” x 16---1/2 x 1”)
	(521 x 419 x 25 mm)		(521 x 419 x 25 mm)
18	Screws	18	Screws
	(#10 --- 14 x 5/8” w/Seal		(#10 --- 14 x 5/8” w/Seal
	Washer)		Washer)
2	Screws	2	Screws
	(#8 --- 18 x 3/4” Type B Pan		(#8 --- 18 x 3/4” Type B Pan
	Head)		Head)
		1	Bracket, Sensor

Table 11 – Economizer Sensor Usage

	ECONOMIZER WITH OUTDOOR AIR DRY BULB
APPLICATION		SENSOR
	Accessories Required
Outdoor Air Dry Bulb	None, The outdoor air dry bulb sensor is factory
		installed.
Single Enthalpy	HH57AC078
Differential Enthalpy	HH57AC078 and CRENTDIF004A00*
CO2 for DCV Control
Using a Wall---Mounted	33ZCSENC02 or CGCDXSEN004A00
CO2 Sensor
CO2 for DCV Control	33ZCSENC02 or
	CGCDXSEN004A00{		or	CRCBDIOX005A00{ {
Using a Duct---	and 33ZCASPCO2 or
Mounted CO2 Sensor
	CGCDXASP00100**

*CRENTDIF004A00 accessory is used on many different base units. As such, these kits may contain parts that will not be needed for installation.

{33ZCSENCO2 and CGCDXSEN004A00 are accessory CO2 sensors. **33ZCASPC02 AND CGCDXASP00100 are accessory aspirator boxes required for duct---mounted applications.

{{CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2 AND 33ZVASPC02 accessories.

ACCESSORIES

The economizer has several field-installed accessories available to optimize performance. Refer to Table 12 for authorized parts.

Table 12 – Accessory List

DESCRIPTION	PART NUMBER
Outdoor Air Enthalpy Sensor	HH57AC078
Indoor Air Enthalpy Sensor	CRENTDIF004A00
Return Air CO2 Sensor (4---20 mA)	CRCBDIOX005A00
CO2 Room Sensor (4---20 mA)	33ZCSENX02 Or
	CGCDXSEN004A00
Aspirator Box for duct Mount CO2 Sensor	33ZCASPC02 Or
(4---20 mA)	CGCDXASP001A00
Space Temperature and CO2 Room	33ZCT55C02
Sensor with Override (4---20mA)
Space Temperature and CO2 Room	33ZCT56C02
Sensor with Override and Set Point
(4---20mA)
Heat Pump Relay Package	CPRLYKIT001A00

INSTALLATION

Small Chassis

To install the Vertical Economizer on the small chassis perform the following procedure:

1. Turn off unit power supply and install lockout tag.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Before installing or servicing system, always turn off main power to system and install lockout tag. There may be more than one disconnect switch. Turn off accessory heater power switch if applicable.

2.Remove economizer hood top panel from the return side of the unit. See Fig. 22. Keep screws and panel next to the unit.

3.Open economizer hood package found on the top skid.

4.Remove red shipping tape that attaches the outside air temperature (OAT) sensor to the economizer assembly. Using two #8 fasteners, found in the hood package, attach the OAT sensor to the economizer according to Fig. 23.

NOTE: See label attached to economizer for OAT installing details.

5.Remove horizontal return duct cover panel and cut the wire ties that hold the hood divider to the economizer assembly. Slide hood divider off from the two slots holding it in place and place next to the unit. See Fig. 24.

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