4
Tank Assembly
Logalux SM300/1 - SM400/1 - Technical specifications are subject to change without prior notice.
20
4.5 Connections for High Output Indi-
rect Fired Tank Piping
The SM300/1 and SM400/1 tanks can also be used for
high capacity indirect fired hot water tanks. Two scenarios
exist.
4.5.1 Serial Connections of the bottom and top
coils
V Connect SM300/1 or SM400/1 coils in series by con-
necting the upper connection of the lower coil to the
lower connection of the upper coil.
V Connect tank charging pump to the upper connection
of the top coil.
V Connect lower connection of the lower coil to the
boiler return piping.
V Install aquastat or temperature sensor into M1 dry well
for the SM300/1 tank (Fig. 3, page 7) or use the M dry
well connection for the SM400/1 tank. (Fig. 4, page 8).
4.5.2 Parallel Connections of bottom and top
coils
The SM300/1 and SM400/1 internal coils can also indi-
vidually connected to dedicated tank charging pumps.
V Connect one tank charging pump to pump into the top
connection of the top coil.
V Install its aquastat or temperature sensor into dry well
M1 for the SM300/1 (Fig. 3, page 7)or dry well M for
the SM400/1 tank (Fig. 4, page 8).
V Connect the second pump to pump into the top con-
nection of the lower coil.
V Install its aquastat into dry well M2 for the SM300/1
(Fig. 3, page 7) or dry well M1 for the SM400/1
(Fig. 4, page 8).
In case of using a 2000 or 4000 series control, the indi-
vidual tank charging pumps must be electrically combined
as the controls do not have 2 separate wiring terminals
available. Please note that the maximum combined amp
draw can NOT exceed 5 Amp. When using pumps with
high amp draws, use isolation relays.
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