Carrier CRECOMZR 004A01 Series User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 534-80004 Printed in U.S.A. Form 48/50-56SI Pg 1 1-01 Replaces: 48/50-49SI
Book111444
Tab 1a1b5a5a6a6b
Cancels: IIK 548-36-33 IIK 548-36-35
1/15/01
Installation Instructions
Part Numbers: CRECOMZR--004A01, CRECOMZR--005A01
CRECOMZR--006A01, CRECOMZR--007A01
TABLE OF CONTENTS
Page
GENERAL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1,2
ACCESSORIES
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . . . . . . 2
VERTICAL ECONOMI$ER INSTALLATION
. . . . . . 2-5
HORIZONTAL ECONOMI$ER
INSTALLATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ACCESSORY INSTALLATION
. . . . . . . . . . . . . . . . . . 7-12
Accessory Hinged Panels
. . . . . . . . . . . . . . . . . . . . . . . . 7
Standard Hood
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Power Exhaust Hood
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Auxiliary Sensors
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Actuator Auxiliary Switch Adjustment
. . . . . . . . . . . 11
COMMISSIONING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .12,13
CO
2
Control Set Up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Mechanical Cooling Lockout
. . . . . . . . . . . . . . . . . . . . 12
Dry-Bulb Changeover Set Up
. . . . . . . . . . . . . . . . . . . . 12
Ventilation Air (Minimum Position
Set Up)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13,14
Differential Enthalpy Switchover
Strategy
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Operating Sequence
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . . . . . . . 14-16
LED Indication
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Manual Configuration Pushbutton
. . . . . . . . . . . . . . . 14
Sensor Characteristics
. . . . . . . . . . . . . . . . . . . . . . . . . . 14
GENERAL
The accessory EconoMi$er package uses microprocessor-
based controls to sequence mechanical cooling with cool out-
door air (free cooling) to satisfy the cooling load and minimize
energy consumption. Free cooling can be used alone or in con-
junction with mechanical cooling.
The standard economizer uses a dry bulb sensor to sense
Outdoor Air Temperature (OAT). This sensor provides two
functions for the EconoMi$er controller: it determines the
availability of free cooling (EconoMi$er changeover); and it
disables compressors at low ambient temperatures (mechanical
cooling lockout).
When free cooling is available, the EconoMi$er sequences
free cooling with up to two stages of mechanical cooling to
maintain comfort in the space. When free cooling is not avail-
able, the EconoMi$er modulates to an adjustable minimum
position set point to maintain a supply of fresh air entering the
building.
Barometric relief dampers provide natural building pressur-
ization control. An optional power exhaust system is available
for jobs requiring greater relief.
The microprocessor CO
2
input terminals allow the addition
of an accessory CO
2
sensor in the space or in return air duct-
work. When the EconoMi$er recognizes the presence of the
CO
2
sensor, a ventilation control strategy automatically begins
to operate. The outdoor air damper modulates open past mini-
mum position as the CO
2
level in the space increases over the
adjustable set point.
See Fig. 1 and 2 for EconoMi$er component locations. See
Table 1 for Package Usage and Contents.
Small Rooftop Products
Gas Heating/Electric Cooling,
Electric Cooling, and Heat Pump Units
3 to 12
1
/
2
Tons
Accessory EconoMi$er Package
with Power Exhaust and Auxiliary Sensors
BAROMETRIC RELIEF DAMPERS
CONTROLLER
ECONOMI$ER
PLUG
GEAR-DRIVEN
DAMPER
OUTDOOR AIR
TEMPERATURE
SENSOR
ACTUATOR
Fig. 1 — 3 to 6 Ton EconoMi$er
Component Locations
CONTROLLER
BAROMETRIC
RELIEF DAMPERS
OUTDOOR AIR
TEMPERATURE
SENSOR
GEAR-DRIVEN
DAMPER
ACTUATOR
ECONOMI$ER
PLUG
Fig. 2 — 7
1
/
2
to 12
1
/
2
Ton EconoMi$er
Component Locations

Carrier CRECOMZR 004A01 Series Specifications

General

Brand	Carrier
Model	CRECOMZR 004A01 Series
Category	Air Conditioner Accessories
Language	English