lp-585 Rev. 000 Rel. 001 Date 9.10.18
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centralized to the solar tank and domestic piping system and near
the solar collectors as possible. Also, locate the tank in as warm a
location as possible, away from areas which would subject the drain
back tank reservoir to freezing temperatures. All piping should be
insulated to protect against freezing and minimize heat loss.
Additionally, the drain back tank, solar water heater, and all
related solar system components should be installed with plenty
of clearance for inspection and service. If minimum clearances are
not met, it may not be possible to service the solar system without
removing components from installation locations.
The drain back tank should also be installed in a place where T&P
discharge or a leak will not result in damage to the surrounding area.
Install a 2” high drain pan with a minimum of ¾” drain line to prevent
water damage if leakage should occur. See Figure 3.
Figure 3 - Recommended Service Clearances
Filled hot water storage and drain back tanks are very heavy, and
should be located in areas that can structurally support such
weight. Failure to properly locate water storage tanks could result
in property damage, personal injury, or death.
D. Specifications and Dimensions
Figure 4 - Drain Back Tank without Heat Exchanger Specifications and
Dimensions
This tank must be installed upright in the vertical position as
described in this manual. DO NOT attempt to install this tank in any
other orientation. Doing so will result in improper tank operation
and property damage, and could result in serious personal injury
or death.
Part 5 - Piping
The design and installation of the solar water heating system should
be done by qualified individuals. It is important that good design
and installation practices be followed to assure that your system will
operate properly. Failure to follow installation guidelines for you solar
water heating system could cause component failure and possible
safety issues.
A. Potable Water Piping
It is very important that you do the potable piping before you pipe
into your solar system. Failure to do so may damage your water
heater.
Do not introduce HTF into any fittings on the heater except those
clearly marked for that purpose.
It is mandatory that all plumbing be done in accordance with local
and state codes or warranty will be void. It is also necessary to use
both thread tape and pipe dope on all mechanical connections. The
potable water piping is located on the side of your solar water heater
and marked Hot and Cold. It is recommended that unions or flexible
copper connectors be used so heater can be easily serviced. Install a
shut-off valve on the cold feed near the solar water heater to isolate
the tank for future service.
Provide clear access to the storage tank, pump, expansion tank, mixing
valve, time clock and other key components. The components on the
potable side of the system may require future service or maintenance,
All drain back tanks eventually leak. Locate the tank where any
leakage from the relief valve, related piping, tank, or connections
will not result in damage to surrounding areas or lower floors
of the building. Any drain back tank should be installed in such
a manner that if it should leak the resulting flow of water will
not cause damage to the area in which it is installed. National
Plumbing codes require a drain pan for any water heater
installation. This drain pan should be sized with a maximum depth
of 2”, and a minimum diameter 2” greater than the diameter of
the water heater. The drain pan should empty into an open drain
line. This drain line should be 3/4” ID minimum, piped to an open
drain. Leakage damages ARE NOT covered by warranty. Failure to
install a drain pan is the sole responsibility of the owner and/or
installer. Reference UPC 2000 (Uniform Plumbing Code) Section
510 - Protection from Damage or IPC 200 (International Plumbing
code) Section 504 - Safety Devices. Leakage damages ARE NOT
covered by warranty.
In addition, water leak detection devices and automatic water
shutoff valves are readily available at plumbing supply houses. IT
IS HIGHLY RECOMMENDED BY THE MANUFACTURER TO INSTALL
WATER LEAK DETECTION DEVICES AND AUTOMATIC SHUTOFF
VALVES IN ANY DRAIN BACK TANK INSTALLATION WHERE A
LEAKAGE OF WATER COULD RESULT IN PROPERTY DAMAGES.
Summary of Contents for Drain Back
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