21
INLET/OUTLET CONNECTIONS
To allow for disconnection of the water heater a mechanical union must always be provided at
the cold water inlet, solar hot water inlet and hot water outlet on the water heater to allow for
disconnection of the water heater. The pipe work must be cleared of foreign matter before
connection. All pipe fittings must be assembled using two spanners
– do not exert excessive
amounts of torque on the pipes or water heater fittings.
PIPE SIZES
The
“Solar Flow” and “Solar Return” pipes between the solar storage tank and the solar
collectors should be DN15
Copper Pipe Only
. The cold water pipe to the water heater should
be the same size or larger than the hot water line from the water heater. For best results,
choose the most suitable pipe size for each individual application. Refer to the relevant
plumbing regulations.
DO NOT USE PLASTIC PIPE WORK BETWEEN COLLECTORS AND TANK.
NOTE:
The
“Solar Flow” and “Solar Return” pipes between the solar storage tank and the
solar collectors
must be
of copper and fully insulated with Bradflex / Armaflex insulation or
similar (minimum thickness 13 mm). Plastic pipe
must not
be used, as it will not withstand the
temperature of the water generated by the solar collectors under certain conditions.
PTR
A drain pipe should be fitted to the PTR valve to discharge clear of the water heater. Connect
the drain line to the PTR valve outlet using a compression union or similar
–
never
braze/solder to any fittings on the water heater. The pipe work from the PTR valve to the drain
should be as short as possible, and fall all the way from the water heater with no restrictions.
The outlet of the drain pipe must be in such a position that flow out of the pipe can be easily
seen, but arranged so hot water discharge will not cause injury, damage or nuisance.
