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Pressure Relief Valve (for Solar System)
Releases pressure in the solar loop when it exceeds 75psi. If the valve opens and releases fluids, contact
your installation contractor immediately.
System Fill Valve (Valve #8)
Fills the system with heat transfer fluid. Also eliminates air from the system.
Expansion Tank
Pre-charged with air to allow for the expansion and contraction of heat transfer fluid.
Drain Valve (Valve #10)
Used to charge the collector loop with glycol, purge air from the loop and drain the solar water heater heat
exchanger of fluid.
Collector Isolation Valve (for system fill) (Valve #11)
Used to direct the flow of heat transfer fluid and to pressurize and eliminate air from the solar system.
Ball Valve (for circulator) Valve #12
Used to isolate the circulator pump for service. Close both ball valves to isolate pump.
Circulator (#13)
Circulates the heat transfer fluid from the solar collector into the solar heat exchanger.
Drain Valve (Tank) (Valve #14)
Flushes sediment which may accumulate on the bottom of the solar water heater and also provides a
means of draining the tank.
Tank Sensor
Is wired to the solar controller to measure the temperature on the bottom of the solar water heater in
conjunction with the solar collector sensor. Turns the circulating pump on and off at the solar control
preset temperature differentials.
Solar Controller
The solar controller turns on or off the circulator depending on heat gained from solar operation. The
controller also limits overheating in the solar water heater. Some controllers have various options. The
controller should always be set in the “auto” position so that it operates the array automatically when
there is solar energy to be collected.
Solar Heat Exchanger
The solar heat exchanger has an integral finned tube designed to transfer heated energy rapidly from the
solar collector into potable water. The heat exchanger is constructed in 90/10 copper nickel for superior
corrosion resistance and long-term reliability.
Hot Water Outlet
Each solar water heater has a hot water dip tube outlet which draws water from the top of the heater. This
helps to keep heat trapped inside the highly insulated storage tank.
Solar Tank Temperature and Pressure Relief Valve
The relief valve must comply with standards for relief valves (ANSI Z21.22) by a nationally recognized lab
that maintains periodic inspections of production listed equipment. No valve of any type should be
installed between the relief valve and tank. Local codes govern installation of relief valves.
The relief valve outlet must be piped to a suitable open drain so that the discharge water cannot contact
live electric parts to eliminate potential damage. Piping used should be approved for hot water
distribution. The discharge line must be no smaller than the outlet of the relief valve and must pitch
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