TC4-4SD

TC4-4SD

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EATING / COOLING OPTION

Stages 3 and 4 can operate as heating or cooling stages.

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Set switches # 6 and # 7 to OFF to use both stages for cooling.

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Set switch # 6 to ON and switch # 7 to

OFF to use Stage 4 for heating and Stage 3 for cooling.

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Set switches # 6 and # 7 to ON to use both stages for heating.

Note that if only one stage is used for heating, it must be Stage 4.

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EMPERATURE PROBES

Connecting the Probes

The controller is supplied with one temperature probe connected to terminal

#1. Up to three additional probes can be connected to obtain more accurate readings and a faster reaction time.

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Use terminals # 2, 3 and 4 to connect additional probes, as shown on the wiring diagram enclosed.

CAUTION

:

Probes operate at low voltage and are insulated from the supply. Be sure that probe cables remain insulated from all high voltage sources. In particular, do not route the probe cables through the same electrical knockout as other cables. Do not connect the shield from the probe cable to a terminal or a ground.

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TC4-4SD

Extending the Probes

Each probe can be extended up to 500 feet (150 m):

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Use a shielded cable of outside diameter between 0.245 and 0.260

in (6.22 and 6.60 mm) to ensure the cable entry is liquid tight (cable dimensions should not be under 18 AWG). Do not ground the shielding.

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It is preferable to weld the cable joint to ensure a proper contact between the two cables.

CAUTION

: Do not run probe cables next to other power cables. When crossing over other cables, cross at 90 o .

Detecting Faulty Probes

If a faulty probe is detected, the Defective Probe pilot light turns on. The ambient temperature shown on the display is then the average temperature measured by the probes in working condition. The controller will operate according to this temperature. If all the probes are defective, the display shows "P".

To identify the faulty probe:

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Set the selection knob to AMBIENT TEMPERATURE. The ambient temperature is displayed.

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Press the push-button. If the probe connected to terminal # 1 is not faulty, "Pr 1" is displayed, alternating with the temperature measured by the probe. Otherwise, "Pr 1" alternates with "P".

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Keep pressing the push-button to view the status of the other probes.

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