Installation manual

PVT-MCT10A-EN Page | 8
2.2.2 Solar Field Controller (SFC)
A Chromasun installation will feature one or more Solar Field Controllers, which serve as the
supervisory controller to the individual MCT units. Each MCT SFC can connect up to four (4)
strings of ten (10) MCT Collectors, for a total of 40 MCT Collectors per SFC. Additional MCT Field
Controllers can be connected to increase the number of panels controlled in the system.
The Solar Field Controllers act to control the field, telling the MCTs when to turn on and off as
well as providing data logging, alarm, and firmware updating functionality.
The SFC takes instructions from the existing building system(s) either via analog signals (dry
contacts), or over Ethernet using BacNET, Modbus, or LonWorks. Consult the MCT Operation
Manual for wiring and configuration details.
The SFC is connected to each string in the array by field-installed conduit home runs that
terminate in a Chromasun-provided junction box. From here, each panel is connected using
Chromasun-provided PDV interconnects. In this way, the SFC supplies power, data and dry
ventilation air to each MCT it controls.
2.2.3 Power, Data, Ventilation (PDV) Interconnects
Our Power, Data, and Ventilation Interconnects are required to provide, power, data, and
ventilation from one MCT to the next. These can be seen below in Figure 5.