![background image](http://html1.mh-extra.com/html/carrier/crecomzr072a01/crecomzr072a01_installation-instructions-manual_2563532001.webp)
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480313-01
Printed in U.S.A.
Form IIK-CRECOMZR72-03
Pg 1
8-21 Replaces: IIK-CRECOMZR72-02
Installation Instructions
Part No: CRECOMZR072A01 and CRECOMZR073A01
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Vertical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . 7
Barometric Hood Assembly . . . . . . . . . . . . . . . . . . . . 8
• BAROMETRIC HOOD (VERTICAL CONFIGURATION)
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
• SUPPLY AIR TEMPERATURE SENSOR (SAT)
• OUTDOOR AIR TEMPERATURE SENSOR (OAT)
• INDOOR AIR QUALITY (CO2) SENSOR
• ENTHALPY SENSORS AND CONTROL
• OUTDOOR AIR ENTHALPY SENSOR/ENTHALPY
• RETURN AIR ENTHALPY SENSOR (HH57AC078)
• ENTHALPY SWITCH/RECEIVER (33CSENTHSW)
• OUTDOOR ENTHALPY CONTROL REQUIRES ONLY
AN ENTHALPY SWITCH/RECEIVER (33CSENTHSW).
• DIFFERENTIAL ENTHALPY CONTROL REQUIRES
BOTH AN ENTHALPY SWITCH/RECEIVER
(33CSENTHSW) AND AN ENTHALPY SENSOR
Power Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Demand Controlled Ventilation . . . . . . . . . . . . . . . . 13
Fire and Smoke Control . . . . . . . . . . . . . . . . . . . . . . 13
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Cooling, Units with EconoMi$er 2, PremierLink
Control and a Thermostat . . . . . . . . . . . . . . . . . . 14
• ROUTINE 2 (DXCTLO < OAT < 68°F)
Heating, Units with EconoMi$er 2, PremierLink™
Control and a Thermostat . . . . . . . . . . . . . . . . . . 16
Cooling, Units with EconoMi$er2,
PremierLink Control and a Room Sensor . . . . . . 16
Heating Unit with EconoMi$er2, PremierLink Control
and a Room Sensor . . . . . . . . . . . . . . . . . . . . . . . 17
• IF HEATING PID STAGES=3 AND AUXOUT=HS3
SAFETY CONSIDERATIONS
Installation of this accessory can be hazardous due to system
pressures, electrical components, and equipment location (such as
a roof or elevated structure). Only trained, qualified installers and
service technicians should install, start-up, and service this
equipment.
When installing this accessory, observe precautions in the
literature, labels attached to the equipment, and any other safety
precautions that apply:
• Follow all safety codes
• Wear safety glasses and work gloves
• Use care in handling and installing this accessory
It is important to recognize safety information. This is the safety-
alert symbol:
. When you see this symbol on the unit and in
instructions or manuals, be alert to the potential for personal
injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which
will
result in
severe personal injury or death. WARNING signifies hazards
which
could
result in personal injury or death. CAUTION is used
to identify unsafe practices, which
may
result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which
will
result in enhanced installation, reliability,
or operation.
GENERAL
The EconoMi$er
®
2 accessories, with 4 to 20 mA actuator signal
control, do not have a built-in controller. The economizer actuator
is operated by a 4 to 20 mA signal from an existing field-supplied
controller (such as PremierLink™ control). A 12-pin plug is
provided for connection to the control.
Refer to the specific DDC (Direct Digital Controls) literature for
how to indicate
economizer alarm/errors in the building space.
Alarm/error indication may be required for local regulation
compliance.
WARNING
Electrical shock can cause personal injury and death. Shut off
all power to this equipment during installation. There may be
more than one disconnect switch. Tag all disconnect locations
to alert others not to restore power until work is completed.
CAUTION
PERSONAL INJURY HAZARD
Failure to follow this caution can result in personal injury and
damage to the unit.
Cover the duct opening as a precaution so objects cannot fall
into the return duct opening. Be sure to remove the cover when
installation is complete.
IMPORTANT: Read these instructions completely before
attempting to install the accessory economizer.
Medium Rooftop Units
Vertical and Horizontal EconoMi$er
®
2 Accessory
15 to 27.5 Tons