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TW2000 WOOD-FIRED BOILER – INSTRUCTION MANUAL
TW2000 10/6/05
16
2.6.1 Free Standing
Free Standing installation requires additional components, which are not included
in the TW2000 boiler kit. Check wiring diagrams TW – 5 and TW – 6 for
additional required components.
In the freestanding, or stand-alone system, the Kerr TW2000 boiler is the sole
source of central heating. In this system connect the piping as you would for any
conventional hydronic heating system (using zone valves, circulator zoning, or
single zone flow check system). The boiler must not be installed as a gravity
system, as the controls are not designed for this type of operation. When
installing the Kerr TW2000 boiler as a stand-alone system, the boiler may be
wired in two ways. For the Stand-Alone wiring diagram, Fig. TW-5 a triple
function aquastat and an additional transformer must be purchased
separately and installed in place of the dual aquastat supplied with the boiler. An
alternative Stand-Alone Wiring diagram, Fig. TW-6 is shown, but an additional
relay and housing must be purchased separately and wired using high
voltage wire only (using 120v wire on 24v coil also). The only special piping
needed is the connection of the special safety by-pass zone valve and blow
down system as described above. For plumbing details see Fig. TW-4.
2.6.2 Parallel
In the PARALLEL SYSTEM the water is circulating between the two boilers by
means of an auxiliary circulator. In this system the flow of water from the existing
boiler (supply) is teed and piped to the return of the Kerr TW2000 boiler. The
return pipe to the existing boiler is teed, and piped to the outlet nipple of the Kerr
TW2000 boiler. Therefore the TW2000 is maintaining heat in both boilers. If the
TW2000 is not being utilized the system warm return water is not keeping the
wood boiler warm.
In the parallel system an auxiliary circulating pump keeps the temperature even
between the two boilers. It is controlled by a separate aquastat on the Kerr
TW2000 boiler. When the water in the Kerr TW2000 boiler is hotter than the set
point of the single aquastat, the circulator comes on and circulates the hot water
between the two units.
This system allows the domestic hot water coil in the existing boiler to supply the
household with hot water without an additional coil in the Kerr TW2000 boiler.