Rheem SolPak Use and Care Manual - Page 26

Section 10: System Component Parts 10) SYSTEM COMPONENT PARTS See Figures 16,17 18 and 19 for the location of the specific components numbered below. 1) Solar Collector(s): Absorbs the sun's heat energy and transfers this heat to the HTF circulating through the collector. (Provided) 2) Collector Sensor: Wired to the system controller. Works in conjunction with the tank sensor to automatically turn your circulating pump on and off at preset temperature differentials. (Provided) 3) Tank Sensor: Wired to the system controller. Works in conjunction with the collector sensor to automatically turn your circulating pump on and off at preset temperature differentials. (Provided) 4) Differential Thermostat: Known as the controller. Automatically turns the circulating pump on and off when there is sufficient heat to be gained from the solar operation. The controller also may be set to limit high temperature build up in the solar storage tank. (Provided) 5) Circulating Pump: Circulates the HTF through the collector loop. (Provided) 6) Isolation / Drain Valve: When closed in conjunction with No. 7 will isolate the circulation pump for repair or replacement. Used to charge the collector loop with glycol, purge air from the loop and drain the heat exchange fluid. (Provided) 11) Expansion Tank: Pre-charged with air to allow for the expansion and contraction of the glycol HTF as it heats and cools. (Provided) 12) Mixing Valve: Automatically blends hot water from the solar storage tank with incoming city cold water to an acceptable set point. Note: A mixing valve must be installed on every solar water heating system. (Provided) 13) Temperature and Pressure Relief Valve: Universally required by the plumbing code on water heaters. Will automatically release and dump water at either 150 PSI of pressure or 210°F in temperature. (Provided) 14) Anode Rod: The "sacrificial" anode rod is installed in your solar storage tank to prevent corrosion to the tank lining by neutralizing aggressive water action. Anode rods have a finite life and require periodic replacement depending on annual tank temperatures and water quality. Determine a replacement schedule with your installation contractor. (Provided) 15) Cold Water Dip Tube: Forces incoming city cold water to the bottom of the solar storage tank to prevent mixing with the warm water at the top of the tank. (Provided) 16) Heat Exchanger: Transfers heat from the solar collector loop to the potable water in the solar storage tank. (Provided) 7) Isolation / Drain Valve: When closed in conjunction with No. 6 it will isolate the circulation pump for repair or replacement. Used to charge the collector loop with glycol, purge air from the loop and drain the heat exchange fluid. (Provided) 8) Isolation Ball Valve: Used in conjunction with component No. 7 to isolate the solar collector loop from the solar storage tank. (Provided) 9) Pressure Relief Valve: Will release glycol loop HTF at 75 PSI. If this valve opens and the HTF fluid is expelled contact your contractor immediately. This valve also can be opened to drain the HTF from the charge glycol loop for replacement. (Provided) 17) Heating Element & Tank Thermostat: The solar storage tank is equipped with an auxiliary 4500 watt, 230 volt electrical heating element. The thermostat controls the temperature setting of the auxiliary heating element. (Provided) 18) Drain Valve: Used to drain the storage tank and to flush sediment from the tank on an annual basis. (Provided) 19) Isolation Ball Valve (Cold Water Supply Line): When open allows potable water to fill the solar storage tank or back-up water heater. When closed isolates the solar storage tank and back-up water heater from the pressurized city cold water supply line. (Not Provided) 10) Pressure Gauge: Indicates pressure in the collector loop. (Provided) 26