ETI | Waveguide Dehydrators, De-icing & Heat Trace System

Do I need to supply the controller with a ground fault breaker?

by ETI Staff | Aug 4, 2011 | Frequently Asked Questions

When using a control or controller that does not include integral ground fault, using a ground fault breaker is required to provide protection for the heater tapes used with this product. Failure to do so will put the installation at risk for fire if the heaters...

What voltage measurement will help determine if the GIT-3A is working properly?

by ETI Staff | Aug 3, 2011 | Frequently Asked Questions

Aside from checking the input voltage from the circuit breaker, you can also check the voltage between the red and black sensor wires on the GIT-3A. The controller should supply 16VDC to the sensor over these wires.

What are the BEMC connections for on my EUR-5A ?

by ETI Staff | Aug 2, 2011 | Frequently Asked Questions

BEMC stands for Building Energy Management Computer, which can be used to remotely monitor and control the EUR-5A controller. These connections are made to pins 10 through 16. The following diagram will aid in making these connections. The BEMC can use the override on...

When the system was installed the high temperature sensor was not installed, can I still make the unit work?

by ETI Staff | Aug 2, 2011 | Frequently Asked Questions

The high temperature sensor is intended for two purposes, either as a slab sensor when the EUR-5A is used for heating sidewalks, patios or driveways or for ambient air temperature when the unit is used for roof and gutter melt systems. In roof and gutter applications...

Why doesn’t adjusting the High Temperature Limit dial turn the unit on?

by ETI Staff | Aug 2, 2011 | Frequently Asked Questions

The high temperature limit dial is used to set the maximum temperature that the unit will work at. When the High temperature limit sensor detects a temperature higher than what is selected on the dial it overrides the system and shuts it off. This function can be used...

Why is my heater light flashing?

by ETI Staff | Aug 2, 2011 | Frequently Asked Questions

A flashing heater light indicates a missing or broken High Temperature Limit sensor. This sensor is required. The sensor is not polarized and must be connected to pins 1 and 2. Refer to figure 17 in the manual.

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

by ETI Staff | Aug 2, 2011 | Frequently Asked Questions

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 the contactor. On...

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

by ETI Staff | Aug 2, 2011 | Frequently Asked Questions

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. The APS-3C is designed without an internal GREP circuit so it will work with external...

Is there a way to make the system come on with temperature only?

by ETI Staff | Aug 2, 2011 | Frequently Asked Questions

The APS C series systems are designed to turn on and off, as the weather requires heat to deal with snow or icing conditions. Although a thermostatic dry contact switch can be used to override the system on for temperature alone, is not recommended since it will...

Why is there a delay between when the APS-4C turns on and when the SC-40C comes on?

by ETI Staff | Aug 2, 2011 | Frequently Asked Questions

This delay between the APS-4C and the SC-40C is programmed into the system in order to reduce surge current. When the heaters are turned on they will have a large inrush of current for a few seconds. If all the heater circuits came on at the same time the inrush...

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