Carrier CRECOMZR087A00 is an accessory for rooftop units that integrates free cooling with mechanical cooling. It utilizes gear-drive technology and a direct mount spring return actuator that closes upon loss of power. The EconoMi$er2 system comes standard with an outdoor air temperature sensor and can accommodate field-installed CO2 sensors. It also features separate barometric relief dampers for natural building pressurization control and an optional power exhaust system for greater exhaust capabilities.
Carrier CRECOMZR087A00 is an accessory for rooftop units that integrates free cooling with mechanical cooling. It utilizes gear-drive technology and a direct mount spring return actuator that closes upon loss of power. The EconoMi$er2 system comes standard with an outdoor air temperature sensor and can accommodate field-installed CO2 sensors. It also features separate barometric relief dampers for natural building pressurization control and an optional power exhaust system for greater exhaust capabilities.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480393-01 Printed in U.S.A. Form IIK-CRECOMZR87-01 Pg 1 3-22 Replaces: NEW
Installation Instructions
Part No. CRECOMZR087A00
* The EconoMi$er2 assembly does not include an economizer controller.
SAFETY CONSIDERATIONS
Installation of this accessory can be hazardous due to system
pressures, electrical components, and equipment location (such as
a roof or elevated structure). Only trained, qualified installers and
service technicians should install, start-up, and service this
equipment.
When installing this accessory, observe precautions in the
literature, labels attached to the equipment, and any other safety
precautions that apply:
• Follow all safety codes
• Wear safety glasses and work gloves
• Use care in handling and installing this accessory
It is important to recognize safety information. This is the safety-
alert symbol: . When you see this symbol on the unit and in
instructions or manuals, be alert to the potential for personal
injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the safety-
alert symbol. DANGER identifies the most serious hazards which
will result in severe personal injury or death. WARNING signifies
hazards which could result in personal injury or death. CAUTION
is used to identify unsafe practices, which may result in minor
personal injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced installation,
reliability, or operation.
GENERAL
The EconoMi$er2 system utilizes the latest technology available
for integrating the use of free cooling with mechanical cooling for
rooftop units.
This system utilizes gear-drive technology with a direct mount
spring return actuator that will close upon loss of power. The
EconoMi$er2 system comes standard with an outdoor air
temperature sensor. Field-installed CO2 sensors are available.
Separate barometric relief dampers provide natural building
pressurization control. An optional power exhaust system is
available for applications requiring even greater exhaust
capabilities.
EconoMi$er2 accessories require a 4 to 20 mA actuator signal
control. These accessories do not include a controller. The
EconoMi$er2 actuator is operated by a 4 to 20 mA signal from an
existing field-supplied DDC controller. See Table 1 for package
contents and Fig. 1 for EconoMi$er2 component locations. See
Table 2 for accessories list and Table 3 for sensor usage.
ACCESSORIES AND COMPLIANCE
Accessories List
The EconoMi$er2 system has several field-installed accessories
available to optimize performance. Refer to Table 2 for authorized
parts and power exhaust descriptions.
Table 1 — Package Contents
PART NUMBER QTY CONTENTS
CRECOMZR087A00
1 Hood Assembly
1 Filter Access Door
1 Aluminum Filter
18 Screws
1 EconoMi$er2 Assembly*
1Barometric Relief Hood
Assembly
1 Hood O/A Panel
1 O/A Panel Access Door
1 O/A Small Blank Off
1 O/A Large Blank Off
1 R/A Small Blank Off
1 R/A Large Blank Off
IMPORTANT: Read these instructions completely before
attempting to install the horizontal EconoMi$er2 accessory. WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury and/
or death.
Disconnect power supply and install lockout tag before
attempting to install the accessory.
Table 2 — EconoMi$er2 Field-Installed Accessories
PART NUMBER DESCRIPTION
CRPWREXH028A01 Small And Large Cabinet Power
Exhaust 208-230v 1Ph
CRPWREXH029A01 Small And Large Cabinet Power
Exhaust 460-v 3Ph
33ZCT55SPT Return Air Dry Bulb
CRHUMDSN001B00
or
33CSENTHSW
Outdoor Air Enthalpy Sensor
CRHUMDSN001B00
or
33CSENTSEN
Return Air Enthalpy Sensor
33ZCSENCO2 CO2 Room Sensor
33ZCASPCO2 Aspirator Box For Duct Mount
CO2 Sensor
33ZCT55CO2 Space Temperature And CO2
Room Sensor With Override
33CZT56CO2
Space Temperature And CO2
Room Sensor With Override
And Setpoint
Small Rooftop Units
Accessory Horizontal Ultra-Low Leak
EconoMi$er2
7-1/2 to 12-1/2 Tons
2
NOTES:
CO2 Sensors (Optional):
1. 33ZCSENCO2- Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
2. 33ZCASPCO2- Aspirator box used for duct-mounted CO2 room sensor.
3. 33ZCT55CO2- Space temperature and CO2 room with override.
4. 33ZCT56CO2- Space temperature and CO2 room sensor with override and setpoint.
INSTALLATION
1. Turn off unit power supply(s) and install lockout tag.
2. Remove the existing unit filter access panel. Raise the panel
and swing the bottom outward. The panel is now disengaged
from the track and can be removed and discarded. (See
Fig. 2.)
3. Remove the indoor coil access panel and discard. (See
Fig. 2.)
4. The EconoMi$er2 hood assembly is shipped assembled. Alu-
minum filter must be installed on some models. See Step 15
on page 3.
5. Slide the EconoMi$er2 assembly into the rooftop unit. (See
Fig. 3.)
6. Slide the EconoMi$er2 assembly all the way back and into
the horizontal R/A opening. (See Fig. 3.)
7. Attach O/A (Outside-air) sensor panel over the panel open-
ing, then lift the economizer. Match the ID (inside dimension)
of the panel with the ID of the economizer, then attach using
provided screws. (See Fig. 4.)
8. Remove and save the 12-pin jumper plug from the unit wir-
ing harness (located in the upper left corner of the unit). Insert
the EconoMiSer2 plug into the unit wiring harness. (See
Fig. 5.) Refer to page 5 for wiring diagram.
NOTE: The 12-pin jumper plug should be saved for future use, in
the event that the EconoMiSer2 assembly is removed from the
unit. The jumper plug is not needed as long as the EconoMiSer2
assembly is installed.
Fig. 1 — EconoMi$er2 Component Locations
Table 3 — Sensor Usage
APPLICATION OUTDOOR AIR
TEMPERATURE SENSOR
RETURN AIR
TEMPERATURE
SENSOR
OUTDOOR AIR
ENTHALPY SENSOR
RETURN AIR
ENTHALPY SENSOR
DRY BULB TEMPERATURE Included
HH79NZ039 ———
DIFFERENTIAL DRY BULB
TEMPERATURE
Included
HH79NZ039
Required
33ZCT55SPT ——
SINGLE ENTHALPY Included
Not Used —
Required
CRHUMDSN001B00
or
33CSENTHSW
—
DIFFERENTIAL ENTHALPY Included
Not Used —
Required
CRHUMDSN001B00
or
33CSENTHSW
Required
CRHUMDSN001B00
or
33CSENTSEN
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury and/
or death.
Disconnect power supply and install lockout tag before
attempting to install the accessory.
Wiring
Harness
Actuator
HH79NZ039
Outside Air
Temperature
Sensor
Outside Air
Dampers (Blades)
3
Fig. 2 — Typical Filter Access Panel View Locations
Fig. 3 — Economizer Installed in R/A Section
Fig. 4 — Attach O/A Panel
Fig. 5 — Fig 7 Top View of EconoMi$er2 Installed in
Unit
9. While everything is open install and wire any other accesso-
ries and/or sensors as applicable and convenient, per their
installation instructions. Some accessories require that unit
ducting already be installed.
10. Attach filler panel above O/A panel. Slide under RTU
(packed rooftop unit) top flange then drop down until bottom
mount holes align with top holes on O/A panel. Fasten with
provided sheet metal screws. (See Fig. 6.)
11. Attach R/A (return air sensor) blank off panel. (See Fig. 7.)
The grommet must be installed before duct work is installed.
12. Install the EconoMiSer2 hood over the EconoMiSer2 assem-
bly. Use screws provided. (See Fig. 6.) Insert screw through
right side flange of hood into EconoMiSer2 flange.
13. Install provided barometric relief hood on field-installed R/A
duct ensuring it is water tight. (See Fig. 8.)
14. Check all wiring for safety then reapply power to the unit.
Verify correct operation and setting of the accessory. Refer to
page 5 for unit wiring diagram.
15. Install the filter by opening the filter clips which are located
underneath the hood top. Insert the aluminum filter into the
bottom filter rack (hood divider). Push the filter into position
past the open filter clips. Close the filter clips to lock the filter
into place. (See Fig. 9.)
16. To adjust economizer minimum position and other settings,
refer to instructions provided with specific Economizer DDC
Controller.
17. Relocate the Outdoor Air Temperature (OAT) sensor if
needed. The OAT is not used with all DDC controls for Econ-
omizer operations. Check specific control used in the unit. If
the control does need OAT sensor, insulate from the metal
surface and move out into the intake hood for a more accurate
read of the outside air. (See Fig. 10.)
Filter Access Panel
Indoor Coil Access Panel
Economizer
O/A Panel
Filters
Screw EconoMi$er2
Plug
EconoMi$er2
Actuator
4
Fig. 6 — Attach Filter Panel and Hood
Fig. 7 — Attach Front R/A Blank Off installation
Panel
Fig. 8 — Attach Relief Damper Hood Assembly to
Return Duct
Fig. 9 — EconoMi$er2 Hood Detail
Fig. 10 — Relocate the Sensor to the Hood
Filler Panel
Filter Access
R/A Blank Off Panel
Attach R/A blank off
using 4 screws provided.
Ductwork not shown.
B
A
HOOD
ALUMINUM
FILTER
FI LT ER
CLIP
Relief Air
Outside Air
Cleanable
Aluminum Filter
Wires Back To
Economizer
Right
Hood
Side
Left Hood
Side
Economizer
Hood
Hole In
Hood Side
OAT
Sensor
RELOCATE OUTSIDE AIR TEMPERATURE SENSOR
(Sensor attaches to the right hood side on horizontal economizer.)
2-3/8 in.
5
Fig. 11 — EconoMi$er2 Wiring
24-v
GRND
LOW
HIGH
Optional
Field Installed
Enthalpy Sensor
Red 1
2
3
4
5
6
7
8
9
10
11
12
Blue
Black
Violet
Pink
Orange
White
Yellow
Outside Air
Temperature
Sensor
500 Ohm
Resistor
White
Green
Black
Re d
Actuator
Assembly
Direct Drive
Actuator
NOTE: The control signal will come from the unit controller harness. See specific unit controller documentation for its
Installation or when using a relative humidity sensor.
EconoMi$er
Plug
6
Economizer performance charts are shown in Fig. 12 and 13. See
base unit installation manual to make adjustments to meet building
ventilation requirements.
Fig. 12 — Barometric Flow Capacity Fig. 13 — Return Air Pressure Drop
0
1000
2000
3000
4000
5000
6000
7000
8000
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Relief Flow (cfm)cfm)
RETURN DUCT STATIC PRESSURE (in.wg)
0
1000
2000
3000
4000
5000
6000
7000
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
RETURN AIR FLOW (cfm)cfm)
RETURN AIR PRESSURE DROP (in.wg)
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480393-01 Printed in U.S.A. Form IIK-CRECOMZR87-01 Pg 8 3-22 Replaces: NEW
© Carrier 2022
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Carrier CRECOMZR087A00 is an accessory for rooftop units that integrates free cooling with mechanical cooling. It utilizes gear-drive technology and a direct mount spring return actuator that closes upon loss of power. The EconoMi$er2 system comes standard with an outdoor air temperature sensor and can accommodate field-installed CO2 sensors. It also features separate barometric relief dampers for natural building pressurization control and an optional power exhaust system for greater exhaust capabilities.
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