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open the controller and change the operational setting
from automatic to off. Failure to turn off the pump can
quickly damage the pump motor, shaft, bearings or
impeller.
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 storage tank and the
back-up water heater (Nos. 24 and 26). Valve handle
No. 24 must be in the horizontal position. Valve
handle No. 26 must be in the vertical position. See
Figure 19a, 100% Solar Operation.
6.5 Solar Preheat
Follow the instructions for the single tank system for
setting the thermostat and the heating elements for
automatic operation. The three way valve above the
solar storage tank (No. 24) must be in the vertical
position. Each valve handle (Nos. 24, 25 and 26) must
be placed in the horizontal position. See Figure 19b,
Solar Preheat.
6.6 100% Utility Power
Follow the instructions for the single tank system
above. All three ball valves above the heaters (Nos.
24, 25 and 26) must have the valve handles placed in
the horizontal position. See Figures 19c 100% Utility
Power and 19d.
7) ISOLATING THE MAJOR COMPONENTS
AND SYSTEM SHUT DOWN PROCEDURES
Your Rheem solar water heating system is designed
so that the key components can be easily 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. 23). In the case of a storage tank or tting 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
nd a glycol leak shut these valves and contact your
installation contractor. Turn the circulating pump off
by setting the controller to the “off” position.
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.
24) to the horizontal position and close the isolation
ball valve (No. 25). 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. 23) and set the three
way valve handle above the conventional water heater
(No. 26) to the vertical position. Set the two way ball
valve handle (No. 30) directly above the heater to the
horizontal position.
Generally, for an extended margin of protection,
you should select a temperature that is at least
5°F lower than the expected lowest ambient
temperature. These figures are examples only
and should not be regarded as specifications. As
use conditions are not within our control, neither
SunEarth nor Dow Chemical guarantees that
freeze damage may not occur at temperatures
other than shown.
Water used to dilute the HTF must meet certain
minimum standards for purity. Impurities in the
dilution water can increase metal corrosion,
reduce the effectiveness of corrosion inhibitors,
increase inhibitor depletion rate, and cause the
formation of scale and other deposits on the heat
exchanger's internal heat transfer surfaces.
Distilled or deionized water is required.
The HTF pH level must be maintained
between 8 and 10 to minimize corrosion and
glycol oxidation in the piping system.
5) SYSTEM START-UP PROCEDURES
Throughout the installation procedures outlined
in Section 4 above, emphasis has been placed on
the correct procedures for plumbing and wiring
the components, checking for plumbing leaks,
pressurizing the collector glycol loop, and elimi-
nating any trapped air that can impact fluid qual-
ity and pump performance. Having completed
these tasks it is time to start up your SolaRay
solar water heating system.
When the glycol loop has been fully charged and
the pressure is around 25 psi (check the pressure
gauge, No. 7), set the differential controller to
the "Automatic" setting. This will activate your
circulating pump. The Goldline controller allows
you to set the "on" differential. Turn the red
rotary switch inside the control housing to 12.
The controller also allows you to limit the finished
solar storage tank temperature if desired. Turn
the red rotary switch inside the controller marked
"Hi Limit" to the 160° setting. SunEarth does
not recommend that the Hi Limit be set any
lower than 160°.
Adjust the valve settings in accordance with
Section 6 below.
6) THREE MODES OF SYSTEM OPERATION
Both single and double tank Solaray systems are
designed to accommodate three separate modes
of operation. Your solar water heating system
can, (1) provide 100% solar operation during
good weather, or (2) serve as a preheater to your
electric water heater adding solar energy when
and as available, or (3) completely bypass the
solar collector loop and solar storage tank and
run 100% on utility power during inclement
weather.
Single Tank Operating Instructions:
6.1 100% Solar Operation:
Turn off the circuit breaker to your solar storage
tank. If a water heater time switch has been
installed, set the switch to the "off" position. If
you have a mechanical timer remove the trippers
from the face of the switch.
6.2 Solar Preheat
Leave the circuit breaker to your solar storage
tank on and set the tank thermostat to the low-
est acceptable temperature setting. The electric
resistance heating elements will come on only
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. To turn the pump off open the controller
and change the operational setting from auto-
matic to off. Failure to turn off the pump can
quickly damage the pump motor, shaft, bearings
or impeller.
Two Tank System Instructions:
6.4 100% Solar Operation
P.14
fig.19a
100% SOLAR
OPERATION