Carrier CRECOMZR087A00 Small Rooftop Units Accessory Horizontal Ultra-Low Leak Instruction Manual

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**Carrier CRECOMZR087A00 Small Rooftop Units Accessory Horizontal Ultra-

Low Leak**

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IMPORTANT: Read these instructions completely before attempting to install the horizontal EconoMi$er2 accessory.

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 that 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 that 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 the accessories list and Table 3 for sensor usage.

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.

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 2 — EconoMi$er2 Field-Installed Accessories

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

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

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.
   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.

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.

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.)

Economizer performance charts are shown in Fig. 12 and 13. See base unit installation manual to make adjustments to meet building ventilation requirements.

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