Carrier 50PG03-07 Especificações descarregar pdf (Página 23)

Mixed-Air Temperature (MAT) Sensor -- The mixed-air

temperature sensor is a 3 K thermistor located at the discharge

of the indoor fan. The sensor is mounted through the side plate

of the blower The sensor is a probe and has blue leads. This

sensor is factory installed. The operating range of temperature

measurement is 0° to 158 E

Outdoor Air Lockout Sensor -- The EconoMi$er IV is

equipped with a temperature limit switch located in the outdoor

airstream which is used to lock out the compressol,s below a

50 F ambient temperature.

ECONOMI$ER IV CONTROLLER WIRING AND OPER-

ATIONAL MODES -- Determine file EconoMi$er IV control

mode before inst_ling sensol_ and accessories. Diffelent sensol_

ale required for different control modes, and a number of

accessories m_eav_dlable. Refer to _tble 3. The EconoMiSer IV

is supplied from the factory with a mixed air temperature

sensor and an outdoor air temperatme sensor. This _dlows for

operation of the EconoMiSer IV with outdoor air dry bulb

changeover control. Additional accessories can be added to

allow for different types of changeover control and operation

of the EconoMiSer IV and unit. See Fig. 14 for wiring.

Outdoor Dry Bulb Changeover -- The stan&trd controller is

shipped from the factory configmed for outdoor dry bulb

changeover control. The outdoor<dr and mixed-air temperature

sensors are included as stan&trd. For this control mode, the out-

door tempel_tture is comptu_ed to an adjustable set point selected

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

point, the EconoMi$er IV will adjust the outside air d_tmpel_ to

minimum position. If the outdoor-air tempel_ture is below the

set point, the position of the outside _tir dampers will be con-

trolled to provided free cooling using outdoor air. When in this

mode, the LED next to the free cooling set point potentiometer

will be on. The changeover temperature set point is controlled

by the free cooling set point potentiometer located on the con-

troL The scale on the potentiometer is A, B, C, and D. See

Fig. 15 for the conesponding temperature changeover values.

Differential Dry Bulb Control -- For differential cay bulb

control the stan&trd outdoor dry bulb sensor is used in conjunc-

tion with an additional accessory ca-y bulb sensor (part number

CRTEMPSN002A00). The accessory sensor must be mounted

in the return _drstream. Connect the return air temperature

sensor to the SR terminal (after lemoving the 620-ohm lesistor)

and to the + terminal on the controllel: See Fig. 16.

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

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

turn ttir stmtu_l is used for cooling. When using this mode of

changeover control, turn the enthalpy set point potentiometer

fully clockwise to the D setting. See Fig. 17.

Outdoor Enthalpy Changeover -- For enthalpy control, ac-

cessory enth_flpy sensor (part number HH57AC078) is

required. Replace the standard outdoor dry bulb temperature

sensor with the accessory enthalpy sensor in the stu_le mount-

ing location. When the outdoor air enthalpy rises above the

outdoor enth_dpy changeover set point, the outdoor<dr dtu_lper

moves to its minimum position. The outdoor enth_dpy

changeover set point is set with the outdoor enthalpy set point

potentiometer on the EconoMi$er [V controller The set points

tue A, B, C, and D. See Fig. 18. The factory-inst_dled 620-ohm

jumper must be in place across terminals SR and + on the

EconoMi$er IV controllel: See Fig. 16.

Differential Enthalpy Control -- For differential enthalpy

control, the EconoMi$er IV controller uses two enfllalpy sen-

sors (CRENTDIF004A00), one in the outside air and one in the

return air duct. The EconoMi$er IV controller compares the

outdoor air enthalpy to the return air enth_dpy to determine

EconoMi$er IV use. The controller selects the lower enth_dpy

ttir (return or outdoor) for cooling. For example, when the out-

door _fir has a lower enthalpy than the return ail: the

EconoMi$er IV opens to bring in outdoor tdr for free cooling.

Replace the stan&trd outside air d U bulb temperature sensor

with the accessoq enthalpy sensor in the same mounting loca-

tion. Mount the return air enthalpy sensor in the return air duct.

The return air enth_flpy sensor is wiled to terminals SR and + on

the EconoMi$er IV controllel: See Fig. 16. The outdoor

enthalpy changeover set point is set with the outdoor enthalpy

set point potentiometer on the EconoMi$er IV controllel: When

using this mode of changeover control, turn the enthalpy set

point potentiometer fully clockwise to the D setting.

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Fig. 14 J EconoMi$er IV Wiring

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