Criterion 6.1.2.7 Collector Circulation Control

Criterion text:
The collector subsystem control shall be designed to be compatible with control requirements of the system.

Comments:
The control system must do what the solar system needs to operate properly. The system was designed with an appropriate controller. Therefore, the installer must use the system control method that the system was SRCC certified with. The manufacturer and SRCC have verified that the various control strategies are compatible.

For example, in systems using a photovoltaic module as the control method, SRCC has verified that the match between the photovoltaic module (Figure 1) and the DC pump (Figure 2) is suitable for proper system operation. Otherwise, if these two components are incompatible, this would greatly affect system operation and performance.

Figure 1

Figure 2

For a system using an automatic draindown valve, the control outputs have been verified to be suitable for use with the specified valve. For those systems using freeze recirculation in warm climates, the differential controller (Figure 3) strategy provides this feature. Once again, install what has been provided with the SRCC certified system.

Figure 3

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