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BK 680 Specific
Page 16
ECOBOILER Cassette Installation Guide
FIG. 5.
Safety Vent Circuit
It is often possible and good practice to utilise the primary flow and return as
part of the safety circuit.
The ball valve and over-ow pipe (28mm diameter) from the expansion tank
should be copper. All pipes in unheated spaces should be lagged.
Various examples can be seen on page 22 & 23.
With solid fuel appliances, it is not practical to provide a sufficiently rapid
reaction for shutting down the fuel in the event of a sudden rise in water
temperature. A temperature valve, or preferably, a combined temperature
and pressure relief valve should be installed to operate in the event of high
water temperature occurring.