System Pre-Start Procedures

Table 12. Zone Thermostat (6U37) “Voltage Output” ramps

 

Nominal Operating Points and Throtting Ranges

 

 

 

 

 

Measured

 

 

 

 

 

 

 

 

between

1U11

Pull-In

Drop-Out

Throtting

these 1U11

Function

Voltage*

Voltage

Range

Terminals

 

 

 

 

 

HEAT 1

4.63 VDC

4.0 VDC

 

 

 

 

 

 

 

HEAT 2

5.88 VDC

5.25 VDC

 

Terminal 5 (heating)

 

 

 

 

HEAT 3

7.13 VDC

6.50 VDC

 

&

 

 

 

 

Terminal 1 (common)

HEAT 4

8.38 VDC

7.75 VDC

 

 

 

 

 

 

 

 

COOL 1

4.58 - 5.42 VDC

3.44 - 4.56 VDC

 

 

 

 

 

 

Terminal 4 (cooling)

COOL 2

5.43 - 6.34 VDC

4.69 - 5.81 VDC

 

 

&

 

 

 

 

COOL 3

6.63 - 7.63 VDC

5.90 - 7.10 VDC

 

 

Terminal 1 (common)

 

 

 

 

COOL 4

7.84 - 8.92 VDC

7.11 - 8.39 VDC

 

 

 

 

 

 

 

Economizer

 

 

2.75 - 4.00 VDC

 

*"Pull-In" and "Drop-Out" valves are ± 0.25 VDC

**If Applicable

Discharge Air Sensor Checkout (Honeywell 6RT1)

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

1.Turn the control circuit switch 1S2, in the unit control panel, to the “OFF” position.

2.At the Master Energy Controller, disconnect the wire connected to Terminal T1. Use a digital ohmmeter to measure the resistance between Terminal T and the wire removed from Terminal T1.

3.Use the conversion chart in Figure 37 to convert the measured resistance to an equivalent temperature.

4.Measure the actual temperature at the sensor location. If the measured resistance in step 2 is not within ± 10.0 ohms of the actual temperature, the 6RT1 is out of range; replace it.

Note: Before condemning the sensor, verify that the connecting cable resistance is not excessive. Refer to the “Field Installed Control Wiring” section.

5.Make all necessary repairs and reconnect the duct sensor lead to terminal T1 on the controller.

6.Turn switches 1S2, 5S1, & 5S2 to the “ON” position to restore power to the control system.

80

SS-SVX09A-EN

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Trane RAUC-C60, RAUC-C50, RAUC-C30, RAUC-C20, RAUC-C40, RAUC-C25 manual Zone Thermostat 6U37 Voltage Output ramps, Terminals
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