CU7 Control Unit
The CU7 range of control units provide the interface between our ignition systems and
the user, either directly or via a burner management system. The CU7 range is designed
to work in conjunction with our ranges of premix units, torches and ancillary
equipment, on both inspirated and premix type systems. The CU7 range is particularly
suited to applications that run continuously as it continuously checks its
flame detection circuits for a system fault.
The CU7 range offers a number of benefits to the user:
In addition the CU7 range has a number of features that enable it to be tailored to individual applications.
Both the CU7/3 and CU7/4 operate in the same way. On initiation, either locally or remotely, the unit commences its spark phase. If a spark is detected, the unit applies power to solenoid valves, allowing air and gas to flow to the torch for combustion. After four seconds in spark mode, the unit stops sparking and looks for a flame. If a flame is detected, the unit continues to operate as long as a flame is detected until shutdown. If a flame is not detected at any time in the flame detection phase, the system shuts down.
The CU7 has two flame detection circuits. During operation, the unit checks each circuit and compares the results. If the circuits give different output, the unit shuts down and indicates a fault.
Our standard designs are easily customized to suit your requirements. Common changes include:
The CU7 range of control units are designed in accordance with the following European harmonized standards (where applicable):
The CU7 range meets the requirements of the following EC directives (where applicable):
The following standard drawings are available in Acrobat format for downloading.
CU7/4 in standard enclosure
Shown below is the external view of a CU7/4 in a standard enclosure. All dimensions are in mm. The unit is housed in a lockable steel enclosure and has four cable entries provided in the bottom face of the enclosure. The enclosure has an IP rating of 55 .
In addition to the options listed above, there are a number of options available for this design.
CU7/3 in EExd enclosure
Shown below is the external view of the CU7/3 in an EExd enclosure, which is suitable for use in potentially explosive atmospheres. All dimensions are in mm.
The enclosure is made of cast aluminium and is certified EExd IIC T6 by INIEX (certificate number 83.103.251)and it has an IP rating of 65 . A number of M20 cable entries are provided in the bottom of the enclosure. In addition to the options listed above, this design has a number of other options:
Page last revised 28 March 2001