ANALOG DEVICE FOR ANALOG OUTPUT TEMPERA- TURE CONTROL Ð The analog controlled device selected must be capable of receiving a 4 to 20 mA signal. Its internal impedance must not exceed 600 ohms.

The power supply of the analog device must be ®eld in- stalled.

Using a 20 AWG twisted wire pair, wire the control signal as follows (Fig. 51).

1.Connect the positive (1) contact to pin 46 of the option module.

2.Connect the negative (−) contact to pin 47 of the option module.

DEVICE UNDER DISCRETE OUTPUT TEMPERATURE CONTROL Ð The factory-supplied SPDT relay must be field installed and wired. See Fig. 52. The relay contacts are rated as follows:

48 va at 24 vac and .25 power factor

125 va at 115 vac and .25 power factor

125 va at 230 vac and .25 power factor

The relay provides a set of contacts (normally open and nor- mally closed) using no. 6 screw terminals while the 24 vdc coil connections are through 1¤4-in. quick connects.

Using a 20 AWG twisted cable, connect the relay coil con- tacts 1 and 2 to the option module pins 50 and 51. Connect the device to be controlled to the normally-open or normally- closed contacts of the relay. Pay close attention to the con- tact ratings listed above. See Fig. 53.

DISCRETE OUTPUT DEVICE UNDER TIMECLOCK CONTROL Ð The factory-supplied SPDT relay must be field installed and wired. (Fig. 52.) The relay contacts are rated as follows:

48 va at 24 vac and .25 power factor

125 va at 115 vac and .25 power factor

125 va at 230 vac and .25 power factor

The relay provides a set of contacts (normally open and nor- mally closed) using no. 6 screw terminals while the 24 vdc coil connections are through 1¤4-in. quick connects.

Using a 20 AWG twisted cable, connect the relay coil con- tacts to the option module pins 53 and 54. Connect the de- vice to be controlled to the normally-open or normally- closed contacts of the relay. Pay close attention to the contact ratings listed above. See Fig. 54.

NC

2

 

COI L

1

COMNO

Fig. 52 Ð Single-Pole, Double-Throw (SPDT) Relay

Field Wiring

Fig. 51 Ð Wiring of Analog Device for Analog Output Temperature Control

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Carrier 39L specifications Single-Pole, Double-Throw Spdt Relay

39L specifications

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