Vertical Economizer; General; Accessories; Installation - Bryant Legacy 574D----A Installation Instructions Manual

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 CO sensors are available for field installation.
2
Barometric relief dampers provide natural building pressurization
control. Barometric relief dampers are built into the design and are
standard. See Table 15 for Hood Package contents. See Table 16
for sensor usage.
Table 15 – Package Contents

SMALL CHASSIS

(sizes 30 and 36)
Qty Content Description
1
Hood Side, Right
1 Hood Side, Left
2 Angle, Filter
Aluminum Filter
1
(20--- 1/2" x 16--- 1/2 x 1")
(521 x 419 x 25 mm)
Screws
18 (#10 --- 14 x 5/8" w/Seal
Washer)
Screws
2
(#8 --- 18 x 3/4" Type B Pan
Head)
Table 16 – Economizer Sensor Usage
ECONOMIZER WITH OUTDOOR AIR DRY BULB
APPLICATION
None, The outdoor air dry bulb sensor is factory
Outdoor Air Dry Bulb
Single Enthalpy
Differential Enthalpy HH57AC078 and CRENTDIF004A00*
CO for DCV Control
2
Using a Wall--- Mounted 33ZCSENC02 or CGCDXSEN004A00
CO Sensor
2
33ZCSENC02 or
CO for DCV Control
2
CGCDXSEN004A00{
Using a Duct---
and 33ZCASPCO2 or
Mounted CO Sensor
2
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 CO
**33ZCASPC02 AND CGCDXASP00100 are accessory aspirator boxes
required for duct---mounted applications.
{{CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2
AND 33ZVASPC02 accessories.
LARGE CHASSIS
(sizes 42, 48, and 60)
Qty Content Description
1
Hood Side, Right
1 Hood Side, Left
2 Angle, Filter
Aluminum Filter
1
(20--- 1/2" x 16--- 1/2 x 1")
(521 x 419 x 25 mm)
Screws
18 (#10 --- 14 x 5/8" w/Seal
Washer)
Screws
2
(#8 --- 18 x 3/4" Type B Pan
Head)
1 Bracket, Sensor
SENSOR
Accessories Required
installed.
HH57AC078
or CRCBDIOX005A00{ {
sensors.
2

ACCESSORIES

The economizer has several field- -installed accessories available to
optimize performance. Refer to Table 17 for authorized parts.
Table 17 – Accessory List
DESCRIPTION
Outdoor Air Enthalpy Sensor
Indoor Air Enthalpy Sensor
Return Air CO Sensor (4--- 20 mA)
2
CO Room Sensor (4--- 20 mA)
2
Aspirator Box for duct Mount CO
(4--- 20 mA)
Space Temperature and CO
2
Sensor with Override (4--- 20mA)
Space Temperature and CO
2
Sensor with Override and Set Point
(4--- 20mA)
Heat Pump Relay Package

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
power switch if applicable.
2. Remove economizer hood top panel from the return side of
the unit. See Fig. 23. 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. 24.
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. 25.
NOTE: Gas units have a flue hood attached to the hood divider.
Unscrew the fastener holding the flue hood in place and dispose
the screw. Follow unit's literature for flue hood installations.
40
PART NUMBER
HH57AC078
CRENTDIF004A00
CRCBDIOX005A00
33ZCSENX02 Or
CGCDXSEN004A00
Sensor 33ZCASPC02 Or
2
CGCDXASP001A00
Room
33ZCT55C02
Room
33ZCT56C02
CPRLYKIT001A00
heater