T775A/B/M SERIES 2000 CONTROLLER

CHECKOUT

Inspect all wiring connections at the controller terminals, and verify compliance with the installation wiring diagrams.

WARNING

Electrical Shock Hazard.

Can cause severe injury, death or property damage.

Disconnect power supply before beginning wiring or making wiring connections, to prevent electrical shock or equipment damage.

If any wiring changes are required, first be sure to remove power from the controller before starting work. Pay particular attention to verifying the power connection (24, 120, or 240 Vac).

After the controller is installed and wired, apply power.

Power Loss

The date and time settings are retained for 24 hours after a power outage. After a power loss of more than 24 hours, the date and time settings may need to be reentered. All other settings are stored permanently.

Temperature Sensor Calibration

As wire length increases, resistance increases and thus the temperature reading increases. If necessary, calibrate the sensor input by reducing the value by the amount shown in the Table 3. For example, a wire run with 18 gauge wire of 1,000 feet, requires a calibration offset of -6.0°F.

IMPORTANT

If the calibration value in the table exceeds the controller’s calibration limits of +/-10°F (+/-6°C), you must use a heavier gauge wire.

For example, with a wire run of 1,000 feet you must use 20 AWG wire or heavier in order to cal- ibrate for wire loss within the limits of the control- ler.

See “2.2.2.2. CALIBRATE (the sensor)” on page 18 for the instructions to enter the calibration value.

CHECKOUT

Table 3. Temperature Sensor Calibration for

Resistance Loss due to Wire Length.

 

 

 

 

 

 

 

 

Temperature Offset in

AWG

 

 

°F (Foot)a

 

mΩ/ft

 

 

 

 

Rating

200 ft

500 ft

 

1,000 ft

 

 

 

 

 

 

14

2.5

0.46

1.14

 

2.28

 

 

 

 

 

 

16

4.0

0.72

1.82

 

3.64

 

 

 

 

 

 

18

6.4

1.16

2.90

 

5.82

 

 

 

 

 

 

20

10.2

1.86

4.64

 

9.28

 

 

 

 

 

 

22

16.1

2.92

7.32

 

14.64

 

 

 

 

 

 

 

 

 

 

 

 

Temperature Offset in

AWG

 

 

°C (Meter)a

 

mΩ/m

 

 

 

 

Rating

100 m

200 m

 

300 m

 

 

 

 

 

 

14

8.3

0.44

0.86

 

1.30

 

 

 

 

 

 

16

13.2

0.68

1.38

 

2.06

 

 

 

 

 

 

18

21.0

1.10

2.18

 

3.28

 

 

 

 

 

 

20

33.5

1.74

3.48

 

5.22

 

 

 

 

 

 

22

52.8

2.74

5.48

 

8.22

 

 

 

 

 

 

aThis is the distance from the controller to the sensor (already accounts for round trip distance).

Fig. 21 shows how sensor resistance varies with temperature for a sensor having a positive temperature coefficient (PTC) of 2.1 Ohms per degree F (3.85 Ohms per degree C).

RESISTANCE (OHMS)

1489

1403

1317

1231

1145

1059

 

1097 ± 0.08 OHMS

 

 

 

AT 77°F (25°C)

 

 

 

 

 

973

1

 

887

 

801

-40

-20

0

20

40

60

80

 

100

120

140

160

180

200

220

 

250 °F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-40

-30

-20

-10

0

10

20 30

40

50

60

70

80

90

100 110

120 °C

TEMPERATURE (DEGREES)

1POSITIVE TEMPERATURE COEFFICIENT (PTC) OF 2.1 OHMS PER °F

M24304

Fig. 21. Sensor Resistance vs. Temperature.

62-0254–03

10

Page 17 Page 19
Page 18
Image 18
Honeywell AC-220-7, AC-140-7 Checkout, Power Loss, Temperature Sensor Calibration, Foota MΩ/ft Rating 200 ft 500 ft 000 ft
Page 17 Page 19

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