Filter

Clips

Aluminum

Filter

A09704

Fig. 35 - Filter Installation (See through view)

Top filter

rack

Evaporator Coil

CONFIGURATION

Economizer Standard Sensors

OUTDOOR AIR TEMPERATURE (OAT) SENSOR— The outdoor air temperature sensor (HH57AC080) is a 10 to 20mA device used to measure the outdoor-air temperature. The outdoor-air temperature is used to determine when the Economizer can be used for free cooling. The operating range of temperature measurement is

40to 100_F (4.4 to 37.8_C). The sensor has 8 selectable temperature changeover setpoints. The temperature changeover is set using 3 dip switches on the sensor. The ABCD potentiometer on the controller should be set to the “D” position. See Fig. 39.

SUPPLY AIR TEMPERATURE (SAT) SENSOR—The supply

 

 

air temperature sensor is a 3 Kthermistor located at the inlet of the

 

 

indoor fan. See Fig. 37. The operating range of temperature

 

 

measurement is 0_ to 158_F (-17.8_to 70_C). See Table 15 for

 

 

sensor temperature/resistance values. The temperature sensor looks

 

 

 

-- A

like an eyelet terminal with wires running to it. The sensor is located

 

in the “crimp end” and is sealed from moisture.

 

--

 

604D

Table 15 – Supply Air Sensor Temperature/Resistance Values

 

 

 

 

 

TEMPERATURE

CELSIUS (_C)

RESISTANCE (OHMS)

 

 

(_F)

 

 

 

 

 

 

 

 

 

 

 

---22

---30

53,010

 

 

 

 

 

 

 

---4

---20

29,091

 

 

 

 

 

 

 

14

---10

16,590

 

 

 

 

 

 

 

32

0

9,795

 

 

 

 

 

 

 

50

10

5,970

 

 

 

 

 

 

 

68

20

3,747

 

 

 

 

 

 

 

77

25

3,000

 

 

 

 

 

 

 

86

30

2,416

 

 

 

 

 

 

 

104

40

1,597

 

 

Screw

(Note 4 and 5)

Bottom filter rack

RIGHT SIDE

122

50

1,080

 

 

 

140

60

746

 

 

 

158

70

525

Supply Air Temperature

Sensor (SAT)

BENT COIL

Top filter rack

Evaporator

Coil

Bottom filter rack

STRAIGHT COIL

A09714

Fig. 36 - Indoor Coil with Filter Rack

Indoor

Blower

A09707

Fig. 37 - SAT Location

39

Page 39
Image 39
Bryant 604D--A Configuration, Economizer Standard Sensors, Supply AIR Temperature SAT SENSOR-The supply

604D--A specifications

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