3
S
AFETY
P
RECAUTIONS
There is no substitute for safety. Always exercise extreme caution, care and good judgment
when working on or around a roof. Here are just a few installation precautions to keep in mind:
When working on the roof, always take care to avoid hazards such as overhead electrical
wires or loose shingles. Secure ladders so they will not slip or fall. Wear shoes with
proper tread to prevent slipping on the ladder or sloped roof areas.
Always check that power is turned off before attempting any wiring or electrical hook-
ups, especially when water is present. It’s always a good idea to shut power off to both
the solar storage tank and to the automatic control when there is water leaking at the tank.
Do not hook up or turn on any electricity to the solar storage tank until it is full of water. If the
heating element is not covered in water prior to being turned on, it will burn out.
Always consult the proper authorities or check with your local building department for the
permit requirements and codes applicable before you start the job. Installation should always be
in accordance with the National Fire Code and with all local codes.
I
NSTALLATION
I
NSTRUCTIONS
S
IZING
& O
RIENTATION
The vast majority of Solar Domestic Hot Water (SDHW) systems are comprised of “Medium
Temperature” solar collectors manufactured using tempered glass and some type of metal
absorber plate. They differ from “Low Temperature” systems predominantly utilized in
swimming pool heating applications. These systems are typically manufactured using plastic
resins. “High Temperature” systems are utilized to generate steam for industrial applications.
Corona collectors belong to the “Medium Temperature” category.
Normally, only one or two Aurora collectors are needed for a SDHW system. The number of
collectors is determined not only by the amount of water that is needed, but also by the latitude
of the installation and the collector’s orientation. The following table details Corona’s
recommended minimum system sizing guide for a typical installation:
Tank
Capacity
# of Collectors
Needed
Collector Type
Control Type
System Model
Number
66 gallon
1
SLAR-32 (4’ x 8’)
Differential
Control
SLAR32DC-66
80 gallon
1
SLAR-40 (4’ x 10’)
Differential
Control
SLAR40DC-80
120 gallon
2
SLAR-32 (4’ x 8’)
Differential
Control
SLAR64DC-120
120 gallon
2
SLAR-40 (4’ x 10’)
Differential
Control
SLAR80DC-120
