| 摘要 |
An additive unit for a central heating or hot water system is connected in line to conduits of the system. The additive unit comprises a chamber having an inlet connected to a first conduit and provided with a valve, and an outlet connected to a second conduit and provided with a valve. The chamber is provided with a drain tap and an access port with a closure cap. A bypass conduit extends through the interior of the chamber. The inlet valve and the outlet valve switch flow from a normal route through the chamber to a bypass route through the bypass conduit. Fluid isolated in the chamber can be removed via a drain tap and an additive/top up fluid introduced via a port. Normal flow can then be restored by operating the valves.
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