Carrier RTU OPEN 11-808-427-01 Especificaciones descargar pdf (Pagina 14)

Installation

8 RTU Open

Using the rooftop equipment control power transformer

1 Remove power from the 24 Vac transformer.

2 Remove connector assembly from RTU Open's

connector.

3 If the rooftop equipment has thermostat connection terminals, connect wiring harness

wire 1 to R,

and

wire 3 to C. Alternately, connect the control power transformer wires to

connector wires 1 (24

Vac) and 3 (Gnd).

4 Apply power to the rooftop equipment.

5 Measure the voltage at the RTU Open’s

terminals 1 and 3 to verify that the voltage is within the

operating range of 21.6–26.4 Vac.

6 Attach harness to RTU Open connector

NOTE

The harness and connector are keyed and must be oriented properly for correct installation.

7 Verify that the

Power

LED is on and the

Run

LED is blinking.

Using an auxiliary control power transformer

If you use a separate control power transformer, it is essential that the auxiliary transformer and the rooftop

transformer are in-phase. You

must

verify this prior to connecting the auxiliary transformer to the RTU Open.

Follow these steps:

1 Verify the available primary voltage at the rooftop equipment.

2 Remove power from the rooftop equipment and install the appropriate auxiliary transformer. Follow the

manufacturer’s installation instructions.

3 Ground one leg of the auxiliary transformer’s secondary wiring.

4 Apply power to the rooftop equipment. Measure the potential between the rooftop equipment control

power and auxiliary transformer's secondary hot (non-grounded) legs. If the voltage measured is less

than 5 volts, the transformers are in-phase; proceed to step 7. If you measure a voltage greater than 24

Vac, then the phases are reversed.

5 Correct the phase reversal by either of the following methods:

○ Remove the ground from the secondary at the auxiliary transformer and connect it to the other

secondary

○ Reverse the primary wiring at the auxiliary transformer

6 Repeat step 4 to rewire.

7 Remove connector assembly from RTU Open's

connector.

8 Connect the auxiliary transformer wires to

wires

(24 Vac) and

(Gnd).

9 Apply power to the transformer.

10 Measure the voltage at the RTU Open’s

and

to verify that the voltage is within the operating

range of 21.6–26.4 Vac.

11 Attach harness to RTU Open's connector

. See illustration below.

NOTE

The harness connectors are keyed and must be oriented properly for correct installation.

12 Verify that the

Power

LED is on and the

Run

LED is blinking.

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Carrier RTU OPEN 11-808-427-01 Especificaciones Pagina 14

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