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A. Expansion tank
B. Expansion tank filler
C. Heater end cover plate
D. Outlet from helical coil
E. Valve No. 2 (purge)
F. Thermal fluid return inlet
G. Valve No. 3 (expansion)
H. Inlet pressure gauge
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I. Pressure differential switch
J. Outlet pressure gauge
K. Valve No. 1 (strainer)
L. Inlet pressure gauge port
M. Strainer
N. Valve No. 4 (coil inlet)
O. Burner fan motor
P. Circulating pump
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Figure 3. Location of components on RH side of HCS heater.
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