Difference between 277 single phase and 277/480 3 phase unit?

The difference is the step down transformer that provides the power for the internal circuitry. On the 277 single phase the transformer is 277 VAC to 24 VAC and you will note that its primary winding is connected to the top and middle poles on the...

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What is the maximum load for the SST-2?

Supply Voltage

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Can I simulate a sensor call for heat to test the system?

by David Mays | Jul 21, 2017 |

contactor, EUR-5A FAQs, heat, Jumper, LED, sensor, terminals, wire

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Yes, to test the system by simulating a sensor call for heat, connect a short jumper wire between terminal block terminals 25 (sensor signal) and 24 (sensor ground). Now the Heat LED should turn on within 10 seconds and the control relay should...

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APS-4C commlink to SC-40

Environmental Technology Inc. has developed and manufactured controllers and sensors for ice and snow management for 45 years. The quality of its products is reflected in the opportunities presented to connect newer products—such as the Snow Switch®...

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What is the difference between the APS 277 single phase unit and the 277/480 three phase unit?

The difference is the step down transformer that provides the power for the internal circuitry. On the APS 277 single phase the transformer is 277 VAC to 24 VAC and you will note that its primary winding is connected to the top and middle poles on...

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Can I use the APS-4C to drive external contactors for more circuits?

No. Doing so will cause the GFEP circuit on the APS-4C to detect the inductive load of the contactor coil as ground fault and alarm the system every time the contactor is turned on.

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