Why is my heater light flashing?

A flashing supply light on any APS or EUR-5A control indicates a missing or broken High Temperature Limit sensor. This sensor is required to make the EUR-5A controller to work. The sensor is not polarized and must be connected to pins 1 and 2. Refer...

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The controller is oscillating – How do I fix this?

by David Mays | Jul 26, 2017 |

100K Ohm, building, EUR-5A FAQs, ground, ground loop, resistor, Sensors

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  • Install a 100K Ohm resistor in-line with the Equipment Ground terminal (19).
  • Disconnect Equipment Ground terminal (18).

Grounding

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What are the BEMC connections for?

BEMC stands for Building Energy Management Computer, which can be used to remotely monitor and control the EUR-5A controller.

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

by David Mays | Jul 21, 2017 |

efficiency, EUR-5A FAQs, ice, moisture, override, snow, system, temperature

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The EUR-5A is 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...

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Why won’t the sensor turn on the system when it is snowing outside?

There can be several reasons for this. First start by checking the sensor supply voltage between pins 2 and 3 of the class two terminal blocks. It should be close to 24 VDC (the label on some unit incorrectly say 24VAC). If there is no voltage then...

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

The High Temperature limit sensor is intended for two purposes, either as a slab sensor when the EUR-5A is used for heating sidewalks, patios or drives ways or for ambient air temperature when the unit is used for roof and gutter melt systems.

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

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 EUR-5A high temperature dial it overrides the system...

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

by David Mays | Aug 02, 2011 |

building, EUR-5A FAQs, Frequently Asked Questions, override

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BEMC stands for Building Energy Management Computer, which can be used to remotely monitor and control the EUR-5A controller.

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

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.

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