27
10) Pressure Gauge (Winters PFQ804): Indicates
pressure in the collector loop. (Provided)
11) Expansion Tank (Arrow 12-A101):
Pre-charged with air to allow for the
expansion and contraction of the glycol
HTF as it heats and cools. (Provided)
12) Mixing Valve (Watts 1170USM2):
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)
17) Thermostatic Gas Valve: The solar
storage tank is equipped with an auxiliary
thermostatic gas valve. The thermostatic gas
valve controls the water temperature in the
solar storage tank to ensure your hot water
supply is never depleted. When there may be
insufficient solar energy, you are still assured
of all the hot water you will need. (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)
20) Check Valve: This valve is installed to
stop or minimize convective evening heat
loss in the system. The heat in the solar
storage tank will rise through the collector
loop piping in the evening in the much
cooler solar collector and dissipate heat
unless prevented from doing so by a check
valve. Check valves are also referred to
as one way valves. (Not Provided)
21) Isolation Ball Valve (Hot Water): Used
in conjunction with component No.
19 to completely isolate the solar
storage tank for repair or replacement
as necessary. (Not Provided)
22) Tank / Line Thermometer(s): Will
read the temperature of the water and
the collector supply and return lines
on sunny days. (Not Provided)
23) Optional Time Switch: Allows you
to automatically or manually turn the
auxiliary thermostatic gas valve in the solar
storage tank on and off. (Not Provided)
24) Three Way Ball Valve: Used in
conjunction with component No.
25 to establish the proper mode of
system operation. (Not Provided)
25) Three Way Ball Valve: Used in
conjunction with component No.
24 to establish the proper mode of
system operation. (Not Provided)
26) Isolation Ball Valve: Used in conjunction
with component No. 21 to completely
isolate the back-up water heater for repair or
replacement as necessary. (Not Provided)
27) Temperature and Pressure Relief Valve:
See No. 13 above. (Provided)
28) Anode Rod: See No. 14 above. (Provided)
29) Cold Water Dip Tube: See No.
15 above. (Provided)
30) Drain Valve: See No. 18 above. (Provided)
31) Thermal Well (Tasseron 8TW4550
or equivalent): Not pictured. (Two
thermal wells provided)
System Component Parts continued
