NOTE: This sensor uses a resistance temperature device (RTD) element. Polarity is not a consideration.

When space does not allow working inside the duct, mount as follows (Fig. 22):

1.Open a duct penetration on the opposite side of the sen- sor junction box.

2.Wrap the element around a 3¤4-in. PVC pipe, cut holes near the center of the duct on both sides and feed the pipe with sensor element through the hole.

3.Secure the seal around the PVC pipe.

NOTE: If local codes do not permit the use of PVC, use EMT instead.

Refer to Field Wiring Connections section, page 52 for wiring instructions and details. See Table 5 for RTD resis- tance vs temperature values.

Table 5 Ð RTD Resistance vs Temperature Values

for Mixed-Air Temperature Sensor

RESISTANCE

TEMP

RESISTANCE

TEMP

RESISTANCE

TEMP

(Ohms)

(F)

(Ohms)

(F)

(Ohms)

(F)

693

−40

940

50

1223

140

719

−30

970

60

1257

150

745

−20

1000

70

1290

160

772

−10

1031

80

1325

170

799

0

1062

90

1360

180

827

10

1093

100

1395

190

854

20

1125

110

1430

200

883

30

1157

120

Ð

Ð

912

40

1190

130

Ð

Ð

 

 

 

 

 

 

Enthalpy Switch (Fig. 23) Ð The enthalpy switch and mounting template are located in a box shipped inside the fan section.

The enthalpy switch is normally mounted in a horizontal position with the sensing element exposed to freely circu- lating outdoor air.

DO NOT install enthalpy switch in locations where ex- cessive moisture, corrosive fumes, and/or vibration are present.

Fig. 21 Ð Mixed-Air Temperature Sensor

(P/N HH79NZ021) Installation

Fig. 22 Ð Alternate Mixed-Air Temperature

Sensor Installation

Mount the switch as follows:

1.Position mounting template on duct. Remove adhesive backing and press template onto outside air duct.

2.Drill four 1¤8-in. mounting holes as indicated on the template.

3.Cut out center portion of duct as outlined on template.

4.Mount controller to duct using screws provided.

If no outside air duct is present, mount the enthalpy switch on a ®eld-supplied and installed plate upstream of the out- side air damper.

Connect the red and blue wires of the enthalpy switch to the PIC control box terminals. Refer to Field Wiring Connections section, page 52 for further details.

CONTROL RANGES Ð See Fig. 24 for control settings and intermediate settings.

MOUNTING HOLES

Y

E

L

R

ED D

B

C

L

 

U

 

B

A

Fig. 23 Ð Enthalpy Switch (P/N HH57AC076)

43

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Image 43
Carrier 39L specifications Mixed-Air Temperature Sensor HH79NZ021 Installation

39L specifications

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