Honeywell AC-220-7, AC-140-7 manual Checkout, Power Loss, Temperature Sensor Calibration

Page 18

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

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Contents FP-4 Freeze Protection KIT Section IntroductionInstallation SectionInstalling the Conduit Section Installation Control BOX Component Layout and Wiring DiagramSetting the Controller OperationSection Troubleshooting Troubleshooting ProceduresSection Replacement Parts Replacement PartsSection Warranty PER VAN AIR Terms and Conditions of SaleProduct Description Temperature Sensorsa Controller DimensionsAccessories Wiring Before InstallationInstallation and Setup MountingTemperature Sensor Wire Type and Size Wiring Connections AccessTemperature Sensor Wiring Multiple Parallel SensorsController Wiring Controller Wiring MethodDescription of Wiring Terminal Connections Terminal Label Wiring Applications ExamplesController Wiring Details Connection Terminal Label Description SensorsWiring for four-stage control 24 Vac input 24 Vac load Wiring for ML7984 valve actuator Wiring for three Series 90 Modutrol Motors Checkout Power LossTemperature Sensor Calibration Foota MΩ/ft Rating 200 ft 500 ft 000 ftUsing the LCD Panel Interface Interface OverviewHome Screen Setup Menu Accessing the MenusUsing the Menus Programming, Scheduling, and Summary MenusProgramming Heating Mode Setpoint and DifferentialCooling Mode Setpoint and Differential Setpoint and DifferentialEntering Program Mode Programming the T775A/B/M ControllerProgram Menu for Outputs Differential or Throttling Range SensorHEAT/COOL Exiting Program Mode SetbackProgram Next Output Mod or Relay Entering Setup Mode Setup Advanced OptionsSetup Procedure Setting up the SensorsCalibrate the sensor Sensor aUnits F or C Label the sensor inputCalibrate Exit Sensor a SetupSensor B LabelHI Limit or LOW Limit Sensor B only Limit Sensor B onlySetting up the Outputs Setting up the Modulating OutputsThrottling Range Sensor B only Type of output signal MIN OUT %Integral Schedule ExitOptions USE SchedMIN OFF minimum off time for all relays DI Options digital input optionsShow RT show run time hours Exit Options Setup Setting up the RelaysType standard or floating Floating Relay Menu Reset RT run time hours Derivative modulating/floating relay onlyExit Setup Mode Setup Outputs Relay ExitEntering Schedule Mode SchedulingCreating a Schedule SET Time SET DateDaylight daylight saving time Setting Individual Schedules Mon-Fri Schedule Defaults1. E1 Setpt setpoint for event 2. E1 Time time for event Exiting Scheduling ModeExit exit from selected time period settings 3. E2 Setpoint setpoint for eventError Message TroubleshootingErrors and Diagnostics Diagnostic MessagesImmunity Compliance Safety ComplianceEmissions Compliance FCC Compliance StatementDOC T775A/B/M Series 2000 Controller

AC-220-7, AC-140-7 specifications

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