The BDC 26 Redundancy Controller is used when an option to operate a redundant mechanical draft system is required. It allows the safeties to be bypassed in case of an EBC 30/31/35 failure. Typical uses are: Controlling redundant mechanical draft systems serving boilers and water heaters in hospitals, hotels and other applications where possible downtime during repair, maintenance or system failure is not acceptable.
The BDC 26 serves as a controlling link between two EBC 30/31/35 Modulating Draft Controllers each controlling a mechanical draft fan and a variable frquency drive.
One EBC 30/31/35 with VFD(s), sensors and the mechanical draft fan(s) is considered the “Primary System” and the other EBC 30/31/35 with VFD(s), sensors and mechanical draft fan(s) is considered the “Secondary System”.
For true redundancy, the Primary and Secondary System’s power supply should be from indpendant electrical circuits, but alternatively, they can be supplied by the same source if needed. In addition, it is also recommended that each VFD is powered by its own electrical circuit if possible.
This controller can be used in conjunction with ENERVEX draft control systems such as the EBC30 and EBC31. It can also integrate with most ENERVEX fan models including RSV, TDF, and IPVB.
|Max Current||10 Amps|
|Operating Temperature||15 to 140°F (-10 to 60°C)|
|Water Temp Sensors (2) NTC||32 to 302°F (0-150°C)|
|Flue Temp Sensors (2) PT1000||-58 to 662°F (-50 to 350°C)|
|Analog Output||(2) 0-10 VDC Modulating|
|Digital Outputs||(4) 250 VAC|
|Warranty||2-year Factory Warranty|
|Listing/Certification||UL 508A Standard for Industrial Control Panels
CSA-22.2 No. 14 "Industrial Control Equipment"