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 FIGURE 2-21
Dry Rotor Circulating
Pumps
2.7.3 Piping.
Virtually all solar heating system piping is copper tubing.
Tubing type ( K, L or M) varies with applications and local code requirements, but
follows traditional application rules. Soft and hard copper are both used.
The use of 50/50 tin/lead solder has been banned by the Federal Safe Drinking
Water Act Amendments of 1986. It also melts at temperatures too low for solar
OPERATION
2.7 COMPONENT OPERATION
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