Criterion
6.1.1.1 Operating Limits
Criterion
text:
Means
shall be provided to protect the SWH system within the design
limits of temperature and pressure.
Comments:
This requirement impacts both system performance and
safety.
Since
solar systems generate large amounts of heat and pressure, means
must be provided in the system design to keep the system within
the designed temperature and pressure limits.
SRCC
system review has verified that the system, using the design
and components specified by the manufacturer, meets the requirements
of this criterion.
The
requirements of this criteria as they relate to the overall
solar system, may also be regulated through proper sizing
of the system and controller strategy. (For example, an inordinately
large collector array connected to a very small tank could
result in higher system temperatures and pressures.)
The
basic protective component for the auxiliary and solar storage
tank is the temperature and pressure relief valve (circled in
red in Figure 1). This valve protects system components from
excessive pressures and temperatures. (Note that the installation
in this example should have included a discharge pipe routed
to a safe and code approved location.)
Figure 1
The
installer must use the SRCC approved temperature and pressure
relief valve provided with the specified storage tank.
The
installer must also follow local codes if they require that the
valve's release is exhausted to a specified proper location. Figure
2 shows that the tank's temperature pressure relief valve exhaust
has been routed out of the living area.
Figure 2
Since
the system has also been sized for a specific storage tank, the
specific tank and tank size approved for the system must be used
in the initial installation as well as in future tank replacements.
Figures
3 and Figure 4 show the SRCC system approval document that highlights
the tank sizes that have been approved for a specific system.
Figure
3
Figure 4
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