HTP SSU-119SE - Manual (Page 20)

20
LP-199 REV. 4.15.14
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 HTF 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 downward to allow complete drainage. The end of the discharge piping should not be threaded or
concealed and must be protected from freezing. No valve of any type, restriction or reducer coupling should be installed in the
discharge line.
Mixing Valve (Rated ASSE 1017) REQUIRED PER SRCC OG-300
Automatically blends hot and cold water feed lines to control discharge to an acceptable and safe temperature. This also increases the
amount of hot water drawn from the solar water heater by not allowing incoming cold water to fully temper the hot water stored inside
the tank. To help prevent injury due to scalding, it is recommended that the mixing valve be set at 120
o
F.
Back-up Electric Element with Thermostat (SE Models)
The back-up electric element will only activate when the desired minimum set point temperature set on the back-up thermostat cannot
be satisfied by the solar gain achieved from the solar collector.
Boiler Back-up Heat Exchanger (SB Models)
The back-up boiler will only activate when the desired minimum set point temperature set on the back-up thermostat cannot be satisfied
by the solar input from the solar collector.
Boiler Back-up Aquastat
The boiler back-up aquastat will activate the boiler to circulate the hot water generated from the boiler into the heat exchanger located
on the top section of SB models. Once the system has reached the desired set point, the controller will shut off the boiler. This back-up
portion will only activate if the solar gain from the collector cannot keep the tank at the minimum desired temperature setting.
Ball Valve (for cold water shut-off) (Valve #24)
The cold water shut off valve should be used in the event of an emergency shutdown.
It is very important that you do the potable piping before you pipe into the solar system. Failure to do so may damage your water
heater. Improper installation IS NOT covered by warranty.