Alternate Energy Technologies EAGLESUN, Инструкция по установке, эксплуатации и обслуживанию

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DXR Drainback
Page 15
COLLECTOR PIPING
The piping of the system should be considered before a final decision is made on how the collectors are mounted.
Piping should be made of copper tube of the type meeting local codes, insulated with a flexible elastomeric pipe
insulation or equivalent, and painted or wrapped where exposed to ultraviolet radiation (pipe insulation should be
rated for 230°F). The collector inlet/outlet piping is 1” nominal copper pipe. Use reducing couplings to reduce down
to the proper system piping size. Multi-panel arrays should be plumbed in reverse-return (see multiple panel layout
below) or should include a balancing valve to insure even flow across the array(s).
All plumbing runs between the tank and the solar collectors should be completely vertical when going up and down
vertical wall surfaces.
All horizontal runs should be sloped at a pitch of l/4" inch per foot back down towards
the direction of the tank. Care should be taken in the spacing of collectors as attachment of piping is easiest with
properly aligned collectors. For example, a flat roof with a parapet wall should be penetrated rather than running
pipes parallel to the roof surface then go up over the parapet wall before going down again. This would create a
rather long horizontal low point in the pipe run where water gets trapped, and it would be unable to properly drain
back into the drainback tank when the pumps shut off.
All plumbing connections to the solar panels should be made with copper pipe only. CVPC may not be attached to
the solar collectors, as very high temperatures may be reached on hot summer days. Piping should be adequately
supported for correct pitch and supports shall be designed to avoid compressing or damaging the insulation material.
Soldered connections should be made with 95/5 solder. Multiple collectors must always be connected in parallel as
shown in the plumbing schematic.
This system includes a fill/drain valve required for servicing the solar collector plumbing loop. This valve should
remain closed under normal operating conditions and should only be opened when maintenance is being performed.
The valve is located as to not disrupt the normal flow of water through the water heater.
A pressure and temperature relief valve must be installed on the water heater and a pressure relief valve must
be installed on the drainback reservoir. No air vent or vacuum beaker is necessary on the solar collector
plumbing runs. The air gap at the top of the water in the drainback tank serves to break the siphoning action.
This action is responsible for proper draining of the solar collectors when the solar circulation pump is shut
off.
Installation of a tempering valve is required. This is an automatic cold water mixer on the hot water side of the tank,
which supplies hot water to the house. Refer to the system drawing on page 31, of this document, for the installation
location of this valve. Only ASSE 1016 and 1017 certified valves are to be used with this system. See the system
parts list, on page 25 of this document, for the valve recommended for this system.