Bryant 580J*04--12 User Manual

Page 37

SUPPLY AIR

TEMPERATURE

SENSOR

MOUNTING

LOCATION

SUPPLY AIR

TEMPERATURE

SENSOR

C06033

Fig. 44 -- Supply Air Sensor Location

The temperature sensor looks like an eyelet terminal with

wires running to it. The sensor is located in the “crimp

end” and is sealed from moisture.
Outdoor Air Lockout Sensor
The EconoMi$er IV is equipped with an ambient

temperature lockout switch located in the outdoor

airstream which is used to lock out the compressors below

a 42_F (6_C) ambient temperature. (See Fig. 38.)
EconoMi$er IV Control Modes
IMPORTANT: The optional EconoMi$er2 does not

include a controller. The EconoMi$er2 is operated by a 4
to 20 mA signal from an existing field-supplied controller.
See Fig. 42 for wiring information.
Determine the EconoMi$er IV control mode before set up

of the control. Some modes of operation may require

different sensors. (See Table 17.) The EconoMi$er IV is

supplied from the factory with a supply--air temperature

sensor and an outdoor--air temperature sensor. This allows

for operation of the EconoMi$er 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 EconoMi$er IV and unit.
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 setpoint selected

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

setpoint, the EconoMi$er IV will adjust the outside air

dampers to minimum position. If the outdoor-air

temperature is below the setpoint, the position of the

outside air dampers will be controlled to provided free

cooling using outdoor air. When in this mode, the LED

next to the free cooling setpoint potentiometer will be on.

The changeover temperature setpoint is controlled by the

free cooling setpoint potentiometer located on the control.

(See Fig. 45.) The scale on the potentiometer is A, B, C,

and D. See Fig. 46 for the corresponding temperature

changeover values.

C06034

Fig. 45 -- EconoMi$er IV Controller Potentiometer

and LED Locations

LED ON

LED OFF

95 100

DEGREES FAHRENHEIT

C06035

Fig. 46 -- Outside Air Temperature Changeover

Setpoints

0.13 0.20 0.22 0.25 0.30 0.35 0.40 0.45 0.50

STATIC PRESSURE (in. wg)

FLOW

CUBIC

FEET

PER

MINUTE

(cfm)

C06031

Fig. 47 -- Outdoor--Air Damper Leakage

Differential Dry Bulb Control
For differential dry bulb control the standard outdoor dry

bulb sensor is used in conjunction with an additional

accessory

dry

bulb

sensor

(part

number

CRTEMPSN002A00). The accessory sensor must be

mounted in the return airstream. (See Fig. 48.) Wiring is

580J