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Plumbing – Coil in Series
A second method of plumbing the domestic coil
is to connect the coil in parallel with an existing
water heater so that the conventional water heater
may be used when the Coal Gun™ is not being 9red
(for example in the summer).
follows indicates how this can be done.
Plumbing – Coil in Parallel
In installations where the coil
discharges directly into the hot
water distribution system a
tempering valve must be included to
limit the temperature of the water at
the faucet to a safe level.
e diagram that
- 11 -
Tempering valve
e third method of plumbing the domestic coil
uses a small pump to circulate water continuously
between the coil and existing hot water heater. It is
also necessary to include a tempering valve or
temperature controller on the supply side of the
storage tank/water heater to prevent super-heated
water from reaching the domestic hot water tank
and, ultimately, the faucets.
Plumbing – Coil with circulator
LOW WATER CUTOFF UTILIZATION
A low water cuto< is required to prevent the
boiler from actively 9ring under a low water
condition. If water is lost from the boiler vessel or
distribution system, such that heat cannot be
distributed from the boiler, the low water cuto< will
shut o< power to the dra; control or forced dra;
fan, preventing the boiler from actively 9ring.
low water cuto< is to be installed in a Tee on the
e
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