HVACR Controllers


Dual Compressor Safety Controller, ETCLO-830


ETCLO-830 The ETCLO-830 Compressor Safety Controller has an anti-short cycle, solenoid valve time delay and lead-lag multi-settings. It is designed for use with any single and two-stage air conditioning and refrigeration equipment for compressor operation and protection control. If during normal operation any safeties are opened (low or high pressure switches), the compressor will shut off immediately. The controller then restarts the A/C unit again and a warning flag will be set. The compressor will be locked-out if safeties are opened for a second time. Manually opening and closing the thermostat can restart the A/C unit and reset the board. The fault can be attended to at any convenient time. The early warning feature will save the compressor from burnout.


Single Compressor Safety Controller, ETCLO-848


ETCLO-848 TThe ETCLO-848 Compressor Safety Controller with fixed anti-short cycle delay is designed for use with any single stage air conditioning and refrigeration equipment as compressor protection. If during normal operation any safeties are opened (low or high pressure switches), the compressor will shut off immediately, and then the controller manages the restart of the A/C unit and a warning flag will be set. The compressor will lock-out if safeties are opened for a second time. Manually opening and closing the thermostat can restart the A/C unit and reset the board. The fault can be attended to at any convenient time. The early warning feature will save the compressor from burnout.


Economizer Controller, ET-757


ET-757 One of the challenges that HVAC design engineers face is developing an air conditioning distribution system to deliver outdoor air to the occupants of a building. This task involves determining whether the outdoor air is acceptable for a free cooling system, and then developing an air intake and mixing control system that will deliver the needed amount of outdoor air to the building at an acceptable cost. This challenge can easily be met with the Economizer Controller ET-757. This controller allows a cooling air handler to supply outdoor air instead of re-circulated air in order to reduce or eliminate the need for a mechanical cooling system during mild or cold weather. If the outdoor air is below the high enthalpy (humidity and temperature) point as set on the board, and based on an analog signal from the enthalpy sensor, the controller will lock-out the compressor (mechanical cooling) and modulate the return and outdoor air dampers to maintain the cooling set point. When the outdoor air enthalpy exceeds the high enthalpy set point, the outdoor air damper moves to the set minimum position for ventilation. The ET-757 meets the requirements of AINSI/ASHRAE/IESNA Standard 90.1-2001, “Energy Standard for Buildings Except Low-Rise Buildings”. Energy saving and improved air quality make the ET-757 attractive to HVAC design engineers and building owners, not to the mention the fact that a system with such a controller usually pays for itself within one or two years.


Economizer Controller, ET-858


ET-858 One of the challenges that HVAC design engineers face is developing an air conditioning distribution system to deliver outdoor air to the occupants of a building. This task involves determining whether the outdoor air is acceptable for a free cooling system, and then developing an air intake and mixing control system that will deliver the needed amount of outdoor air to the building at an acceptable cost. This challenge can easily be met with the Economizer Controller ET-858. This controller allows a cooling air handler to supply outdoor air instead of re-circulated air in order to reduce or eliminate the need for a mechanical cooling system during mild or cold weather. If the outdoor air is below a high enthalpy (humidity and temperature) limit, typically 28 BTU/lb or 75°F db, the controller will lock-out the compressor (mechanical cooling) and modulate the return and outdoor air dampers to maintain the cooling set point. When the outdoor air enthalpy exceeds the high limit set point, the outdoor air damper moves to the set minimum position for ventilation. ET-858 can also control the amount of fresh air needed for ventilation by means of an analog signal from an indoor air quality sensor. This is to meet the Demand Control Ventilation (DCV) requirement. The indoor air quality sensor (typically CO2 sensor) determines the demand for fresh air based on the occupancy of the building by measuring the amount of CO2 (unlike a fixed rate of fresh air for maximum occupancy). The ET-858 meets the requirements of AINSI/ASHRAE/IESNA Standard 90.1-2001, “Energy Standard for Buildings Except Low-Rise Buildings”. More details on DCV can be found at the Learning Centre. Energy saving in DCV and improved air quality make the ET-858 attractive to HVAC design engineers and building owners, not to the mention the fact that a system with such a controller usually pays for itself within one or two years.


Economizer Controller ET-792 and ET793 – Psychrotroll


ET-793 A unique electronic controller design using one sliding damper to function as a return and fresh air mixing process instead of using two separate dampers. This design utilizes one actuator for one damper for both fresh air and return air. The controller is designed to operate a 12 VDC actuator to slide the damper to the required position. The controllers receive inputs from supply air temperature and outdoor temperature or enthalpy digital signal. One damper control system saves cost and space in the packaged air conditioning unit.


Power Switching Relay Board (24 VAC, 5 RELAYS), ET-854


et854 The ET-854 relay board is designed to convert 24 and 240VAC control signals to 240VAC dry contacts to operate 3-speed fans, compressors, heater relays, and other line voltage devices.







Power Switching Relay Board (24 VAC, 5 RELAYS), ET-788


ET-788 The ET-788 relay board is designed to convert 24VAC control signals to 240VAC dry contacts to operate 3-speed fans, compressors, heater relays, and other line voltage devices.


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