Criterion 6.2.1 Stagnation

Criterion text:
The system shall be able to withstand prolonged periods of stagnation (high solar flux, no hot water demand) without significant system deterioration and with no maintenance. This includes conditions during loss of electric power to the system.

Comments:
The requirements of this criteria are evaluated during the SRCC system review process.

Proper system sizing is critical in meeting the requirements of this criterion since the size and overall system integration of the various components are critical.

Since some system designs can generate very hot temperatures, the SRCC review has ensured that the certified system is properly designed and will be able to withstand prolonged periods of stagnation.

Differential systems control this with a controller's high temperature cut off feature, while photovoltaic controlled, thermosiphon and ICS systems must be properly designed and sized to avoid detrimental stagnation temperatures.

Installers must follow the manufacturer's recommended system sizing and refer to the manufacturer's SRCC approved installation manual (Figure 1) and SRCC system document (Figure 2) that details the related components and plumbing strategy that should be installed as part of the system.

Figure 1

Figure 2

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