Burnham 40A - Manual (Page 13)

13
Figure 8
Typical Steam Boiler w/Connections Available Below Water Line
Figure 9
3. Typical steam boiler with connections available
below the water line (Refer to Figure 9).
a. The Alliance™ connection labeled "BOILER
RETURN" should be piped to a tapping in the
boiler that is below the lowest permissible water
level. The use of unions, a shut-off valve, and a
drain valve is recommended for future service
convenience. The use of a flow control or check
valve is required to prevent back flow through
the water heater during operation of the space
heating system.
b. The Alliance™ connection labeled "BOILER
SUPPLY" should be piped to a tapping in the
boiler section furthest away from the return
tapping to prevent short circuiting in the boiler.
This tapping should be high enough to provide
hot water but must be below the lowest
permissible water level. The water heater
circulator should be floor mounted with full size
(1" minimum) piping from the boiler and no
flow restrictions in this piping. Be sure the flow
arrow on the circulator points toward the water
heater. The use of a union, shut-off valves, and
a drain valve is recommended for future service
convenience. The use of an in-line "Y" style
strainer is required to prevent accumulation of
sludge in the water heater's coil.