9
PART 2: IMPORTANT INFORMATION
A. SCOPE OF MANUAL
This manual pertains only to the installation and operation of the HTP Solar Collector. Details for the
installation, operation and maintenance of the complete solar gas/electric water heating system including,
but not limited to storage tank, gas/electric booster, pump, system controller, valves and other plumbing
components should be provided separately by their respective manufacturers.
NOTE: This manual is primarily a reference document for installation officers, as the solar collector is not
permitted to be installed by non-authorized persons.
B. LOCAL STANDARDS
Installation must be completed in accordance with local standards and regulations.
C. AUTHORIZED PERSONS
Installation must be completed by a qualified tradesperson who holds relevant industry licenses or
certificates. The term “authorized person(s)” used throughout this document refers to a suitably qualified
professional. Unless otherwise specified in section 3, no part of the HTP solar collector may be inspected,
repaired, or maintained by anybody other than an authorized person.
D. TERMINOLOGY
The terminology used from region to region differs. To avoid confusion please note the following:
Supply
- The plumbing line running from the outlet of the collector back to the tank.
Return
- The plumbing line running from the tank (or heat exchanger) to the inlet of the collector. This
line incorporates the circulation pump.
Insulation
- Solar radiation level, expressed in kWh/m
2
/day or Btu/ft
2
/day
E. POSSIBLE SYSTEM DESIGNS
1. OPEN LOOP SYSTEMS
For open loop systems, the normal operating pressure should be < 72.5 psi via use of a pressure limiting
(pressure reduction) valve on the main cold supply line.
It is acceptable for the system design to allow the solar collector to stagnate to prevent additional heating
of the storage tank (i.e. pump stoppage once tank temperature reaches 177
o
F). The pressure relief valve
must be able to release the pressure increase that occurs when the manifold stagnates, and should be
rated to meet the maximum possible heat output of the solar collector(s). Please see Part 6, Section F
regarding insulation of piping for high temperatures, and Part 3 for sections regarding overheating.
2. CLOSED LOOP SYSTEMS
For closed loop systems, the solar loop must operate at < 72.5 psi, and have an expansion vessel
installed to control water expansion. The system design MUST NOT allow stagnation of the collector as a
standard form of controlling tank temperature, as this may cause damage to the glycol.
Any system design must provide means for allowing pressure release at no more than 113 psi. It is
recommended that the lever on pressure and temperature relief valves (PTRV) on main pressure hot
water storage tanks be operated once every 6 months to ensure reliable operation. It is important to raise
and lower the lever gently, and be careful as the water released will be HOT. Failure to operate the
Summary of Contents for HP-30SC
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