when the tank temperature falls below the ther-
mostatic set point. If the solar heated water
entering the tank is warmer than the thermosta-
tic set point, the electric heating elements will
not come on. If you have a water heater timer,
you may preset the timer to turn the heating ele-
ment on and off at specified times throughout
the day if desired.
6.3 100% Utility Power
Leave the circuit breaker to your solar storage
tank on and close the isolation ball valves in the
collector loop (Nos. 5 and 10). In this mode of
operation
you must turn off the circulation
pump.
Turn off the circulation pump toggle
switch (No.21). Failure to turn off the toggle
switch may cause permanent damage to your
pump in a very short time.
Two Tank System Instructions:
6.4 100% Solar Operation
Follow the instructions for single tank systems
above. You also must change the position of the
three way ball valves above both the solar stor-
age tank and the back-up water heater (Nos. 23
and 25). Valve handle No. 23 must be in the hor-
izontal position. Valve handle No. 25 must be in
the vertical position. See Figure 18a, 100% Solar
Operation.
6.5 Solar Preheat
Follow the instructions for the single tank system
for setting the thermostat and the heating ele-
ments for automatic operation. The three way
valve above the solar storage tank (No. 23) must
be in the vertical position. The three way valve
above the back-up tank (No. 25) must be in the
horizontal position. See Figure 18b, Solar Preheat.
6.6 100% Utility Power
Follow the instructions for the single tank system
above. All three ball valves above the heaters
(Nos. 23, 24 and 25) must have the valve handles
placed in the horizontal position. See Figures 18c
100% Utility Power and 18d.
7) ISOLATING THE MAJOR COMPONENTS
AND SYSTEM SHUT DOWN PROCEDURES
Your SolaRay solar water heating system is
designed so that the key components can be eas-
ily isolated for emergency repairs or routine
maintenance. By shutting a single valve you can
isolate the entire system from the pressurized
cold water supply line (No. 22). In the case of a
storage tank or fitting leak immediately shut this
valve and call your installation contractor for
service.
The collector loop can be isolated from the solar
storage tank by closing isolation ball valves Nos.
5 and 10. If the pressure in this loop drops or you
find a glycol leak shut these valves and contact
your installation contractor. Turn the circulating
pump toggle switch to the off position (21).
In two tank systems the solar storage tank can be
isolated from the back-up water heater.
Set the valve handle on the three way ball valve
(No. 23) to the horizontal position and close the
isolation ball valve (No. 24). By closing these two
valves the tank can be serviced or replaced. The
operation of the back-up water heater will not be
effected.
The back-up water heater in two tank systems
also can be isolated from the rest of the system.
Close the cold water supply line ball valve (No.
22) and set the three way valve handle above the
conventional water heater (No. 25) to the vertical
position. Set the two way ball valve handle (No.
29) directly above the heater to the horizontal
position.
P.14
fig.18c
100% UTILITY
POWER
fig.18b
SOLAR
PREHEAT
fig.18a
100% SOLAR
OPERATION
