© The Fulton Companies 2016
INSTALLATION VTG-IOM-2016-1214 SECTION 2
2-8
9. Install corrosion coupon holder to assess corrosion
inhibitor performance if appropriate.
10. Before installing a Vantage boiler into a hydronic
loop, be sure that the system piping and any other
components of the system are clean and free of debris,
ferrous oxide (magnetite), and any foreign matter. The
hydronic system is completely ushed prior to installing
the boiler itself.
Variable Primary Piping Arrangement
Vantage boilers are designed for installation in variable
primary ow piping arrangements. See Figure 3. Although it
is acceptable to install Vantage boilers in a primary-secondary
conguration, it is not required.
Adhere to the following for variable primary piping
arrangements:
1. Variable primary arrangements, sometimes referred
to as full ow systems, send all hydronic water ow
directly through the boiler(s). This arrangement
eliminates temperature mixing associated with
primary-secondary piping, thereby delivering the
lowest temperature water directly to the boiler return
connections, and increasing thermal eciency of the
condensing boiler plant.
2. The Vantage boiler does not have a minimum return
water temperature requirement. Do not install three
way mixing valves or bypass piping as low water
temperature protection is not required.
3. The Vantage boiler heat exchanger will not be harmed
by a low ow or zero ow condition, however, proper
design ow will be required to deliver heat to users and
prevent nuisance high temperature limit trips. Select
pump(s) with sucient total dynamic head for the
pressure drop of the loop at design ow.
4. Motorized isolation valves are used in multiple
boiler primary only arrangements to ensure system
eectiveness. One motorized isolation valve should be
installed per boiler; two-position type actuator, open
or closed. It is acceptable to install the valve on either
the inlet or the outlet piping of each boiler. Motorized
isolation valves are used to eliminate mixing of
unheated supply water resulting from ow through idle
boilers, which causes the active boiler(s) to operate with
higher supply water temperatures that may exceed
manual reset high temperature limits. Proper control
strategy must be used to ensure ow paths in the
hydronic loop and residual heat in the pressure vessel
is adequately dispersed when a burner is disabled. The
valve control system must be capable of leaving the
current lead boiler valve open at all times.
5. Multiple boiler systems should utilize a reverse
return header to properly balance ow across the
boilers. Where reverse return cannot be used, it is
recommended to install a balancing valve per boiler.
Primary-Secondary Piping Arrangement
It is acceptable to install the Vantage boiler in a primary-
secondary arrangement, although this arrangement is not
required. See Figure 4. Primary-secondary arrangements are
used to decouple the water ow of the primary (boiler) loop
from the secondary (system) loop. Temperature mixing occurs
in the shared piping region.
Adhere to the following for primary-secondary piping
arrangements:
1. Typical shared piping methods include closely spaced
tees, a buer tank, or a hydraulic separator.
2. When using closely spaced tees as a decoupling
method, the tees should be separated by four pipe
diameters or less.
3. It is recommended to install the dedicated boiler
circulator on the inlet side of the Vantage boiler,
pumping into the return connection. Select pump(s)
with sucient total dynamic head for the pressure drop
of the loop at design ow.
4. Systems with multiple boilers should have a single
common supply and a single common return
connection into the secondary (system) piping. Do
not use separate connections for each boiler into the
secondary piping.
5. Multiple boiler systems should utilize a reverse return
primary header to properly balance ow across the
boilers. Where reverse return cannot be used, it is
recommended to install a balancing valve per boiler.
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