Carrier 48TM016-028

ECONOMI$ERIV CONTROL MODES

Determine the EconoMi$erIV control mode before set up of

the control. Some modes of operation may require different sen-

sors. Refer to Table 12. The EconoMi$erIV is supplied from the

factory with a supply air temperature sensor, a low temperature

compressor lockout switch, and an outdoor air temperature sen-

sor. This allows for operation of the EconoMi$erIV with out-

door air dry bulb changeover control. Additional accessories

can be added to allow for different types of changeover control

and operation of the EconoMi$erIV and unit.

Table 12 — EconoMi$erIV Sensor Usage

*CRENTDIF004A00 and CRTEMPSN002A00 accessories are

used on many different base units. As such, these kits may con-

tain parts that will not be needed for installation.

†33ZCSENCO2 is an accessory CO2sensor.

**33ZCASPCO2 is an accessory aspirator box required for duct-

mounted applications.

††CRCBDIOX005A00 is an accessory that contains both

33ZCSENCO2 and 33ZCASPCO2 accessories.

Outdoor Dry Bulb Changeover — The standard controller is

shipped from the factory configured for outdoor dry bulb

changeover control. The outdoor air and supply air temperature

sensors are included as standard. For this control mode, the

outdoor temperature is compared to an adjustable set point

selected on the control. If the outdoor-air temperature is above

the set point, the EconoMi$erIV will adjust the outdoor-air

dampers to minimum position. If the outdoor-air temperature is

below the set point, the position of the outdoor-air dampers will

be controlled to provide free cooling using outdoor air. When

in this mode, the LED next to the free cooling set point potenti-

ometer will be on. The changeover temperature set point is

controlled by the free cooling set point potentiometer located

on the control. See Fig. 38. The scale on the potentiometer is A,

B, C, and D. See Fig. 39 for the corresponding temperature

changeover values.

Differential Dry Bulb Control — For differential dry bulb

control the standard outdoor dry bulb sensor is used in conjunc-

tion with an additional accessory return air sensor (part number

CRTEMPSN002A00). The accessory sensor must be mounted

in the return airstream. See Fig. 40.

In this mode of operation, the outdoor-air temperature is

compared to the return-air temperature and the lower tempera-

ture airstream is used for cooling. When using this mode of

changeover control, turn the free cooling/enthalpy set point

potentiometer fully clockwise to the D setting. See Fig. 38.

IMPORTANT: The optional EconoMi$er2 does not include

acontroller.TheEconoMi$er2isoperatedbya4to20mA

signal from an existing field-supplied controller (such as

PremierLink™ control). See Fig. 37 for wiring information.

APPLICATION

ECONOMI$ERIV WITH OUTDOOR AIR

DRY BULB SENSOR

Accessories Required

Outdoor Air

Dry Bulb

None. The outdoor air dry bulb sensor

is factory installed.

Differential

Dry Bulb CRTEMPSN002A00*

Single Enthalpy HH57AC078

Differential

Enthalpy

HH57AC078

and

CRENTDIF004A00*

CO2for DCV

Control using a

Wall-Mounted

CO2Sensor

33ZCSENCO2

CO2for DCV

Control using a

Duct-Mounted

CO2Sensor

33ZCSENCO2†

and

33ZCASPCO2**

CRCBDIOX005A00††

Fig. 38 — EconoMi$erIV Controller Potentiometer

and LED Locations

LED ON

LED OFF

40 45 50 55 60 65 70 75 80 85 90 95 100

DEGREES FAHRENHEIT

Fig. 39 — Outside Air Temperature

Changeover Set Points

IAQ

SENSOR

RETURN AIR

TEMPERATURE

OR ENTHALPY

SENSOR

TR1

24 Vac

COM

Vac

HOT

EFEF1

EXH

2V10V

EXH

Set

2V10V

DCV

Free

Cool

SO+

SR+

AQ1

DCV

Min

Pos

Open

Max

Fig. 40 — Return Air Temperature or

Enthalpy Sensor Mounting Location