Water System Piping - A.O. Smith Solar Storage Tank Water Heater Use & Care Manual

Water System Piping

FIGURE 7
JACKET TOP WATER CONNECTION LOCATIONS
HOT OUTLET
119
GALLON
ONLY
SOLAR OUT (UP)*
*SEE FIGURE 8 FOR SIDE SOLAR CONNECTIONS (OPTIONAL). YOU MAY USE
EITHER THE TOP OR THE SIDE SOLAR CONNECTIONS.
Piping, fi ttings, and valves should be installed according to
the installation drawing (Figure 8). If the indoor installation
area is subject to freezing temperatures, the water piping
must be properly insulated.
FIGURE 8
WATER PIPING INSTALLATION
MIXING
VALVE
SOLAR OUT (UP)*
SOLAR IN (DOWN)*
MIXED HOT
WATER
OUTLET
SOLAR IN (From Collector)*
SOLAR OUT (To Collector)*
1 INCH
MIN.
SUITABLE DRAIN PAN
2-1/2 INCH DEPTH MAX.
* YOU MAY USE EITHER THE TOP OR THE SIDE SOLAR CONNECTIONS.
The water supply pressure should not exceed 80 psi. If this
occurs, a pressure reducing valve with a bypass should be
installed in the cold water inlet line. This should be placed
on the supply to the entire house in order to maintain equal
hot and cold water pressures.
IMPORTANT:
• Heat must not be applied to the water fittings on the heat-
er as they may contain nonmetallic parts. If solder con-
nections are used, solder the pipe to the adapter before
attaching the adapter to the hot and cold water fittings.
• Always use a good grade of joint compound and be cer-
tain that all fittings are tight.
6
COLD INLET
ANODE
SOLAR IN (DOWN)*
TEMPERATURE AND
PRESSURE RELIEF VALVE
IN A CLOSED SYSTEM
USE EITHER:
1. THERMAL EXPANSION TANK
2. PRESSURE RELIEF VALVE
PRESSURE REDUCING
VALVE WITH BYPASS
UNION
COLD WATER
INLET VALVE
TEMPERATURE AND
PRESSURE RELIEF VALVE
DISCHARGE LINE
(DO NOT CAP OR PLUG)
M A S S A C H U S E T T S :
DRAIN LINE
INSTALL A VACUUM
3/4 INCH ID
RELIEF
MINIMUM
WATER
SECTION 19 MGL 142.
6 INCH MAXIMUM AIR GAP
BETWEEN THE END OF THE
DISCHARGE LINE AND DRAIN
DRAIN
Piping Installation
1. Install the water piping and fittings as shown in
Figure 8. Connect the cold water supply (3/4" NPT) to
the fitting marked "Cold Water In". Connect the hot water
supply (3/4" NPT) to the fitting marked "Hot Water Out".
IMPORTANT: Some models may contain energy saving
heat traps to prevent the circulation of hot water within the
pipes. Do not remove these inserts.
2. The installation of unions in both the hot and cold
supply lines are recommended for ease of
solar storage tank water heater for service or replacement.
3. The manufacturer of this solar storage tank water heater
recommends installing a mixing valve or an anti-scald
device in the domestic hot water line as shown in Figure
9. These valves reduce the point-of-use temperature of
the hot water by mixing cold and hot water and are readily
available. Contact a licensed plumber or the local plumbing
authority. Install a spring check valve in the cold water inlet
to the mixing valve (See Figure 9). Connect the piping
that will carry the water from the solar storage tank to the
solar collectors, then to the fitting marked "SOLAR OUT."
Connect the return line from the solar collectors to the
fitting marked "SOLAR IN." You may use either the top
connections or the side connections (see Figure 8).
IMPORTANT: Cap or plug the solar connections that are
not used.
FIGURE 9
MIXING VALVE
COLD WATER
TOP WATER CONNECTIONS
INLET
SOLAR OUT (To Collector)
IN COLD
MIXING
LINE PER
VALVE TO
FIXTURES
4. Recirculation return lines should be connected to an
auxiliary solar storage tank water heater (see Figure
10, Page 7). DO NOT connect recirculation lines to
the solar storage tank. Recirculation pumps should be
controlled by a timer which will stop circulation at night
or any time hot water is not being used.
5. If components in the solar control system have
maximum working pressures that are lower than the
maximum water supply pressure, a pressure reducing
valve with an integral strainer and by-pass should
be installed in a cold water supply line. The pressure
water
removing the
MIXED
COLD
HOT
WATER
WATER
INLET
OUTLET
SOLAR IN (To Collector)
SPRING
CHECK VALVE
MIXING VALVE
(SET TO 120° F)