© Fulton Group N.A., Inc. 2022
2-10
INSTALLATION EDR-SOLA-IOM-2022-0216 SECTION 2
Ensure ow paths in the hydronic loop and residual heat in the pressure
vessel is adequately dispersed for sucient time after the burner is
disabled. The valve control system must be capable of leaving the lead
boiler valve open at all times.
Use a reverse return header to balance ow across the boilers. Where
reverse return cannot be used, it is recommended to install a balancing
valve per boiler.
Do not install three-way mixing valves or minimum temperature
protection. This boiler does not have a minimum return water temperature
requirement.
Install system bypass valve(s) at or after the last coil(s), do not install bypass
valves directly after the secondary (system) pump(s).
Primary-Secondary Piping Arrangement
It is acceptable to install this boiler in a primary-secondary arrangement, although
this arrangement is not required. See Figures 6 and 7. Primary-secondary
arrangements are used to decouple the water ow of the primary (boiler) loop
from the secondary (system) loop. Blending occurs in the shared piping region.
Adhere to the following for primary-secondary piping arrangements:
Typical decoupling methods include closely spaced tees, a buer tank, or a
hydraulic separator. Where using closely spaced tees, separate by four pipe
diameters or less.
Install the dedicated boiler circulator on the inlet side of the Endura boiler,
pumping into the return connection. Select pump(s) with sucient total
dynamic head for the pressure drop of the loop at design ow. See Figure 3
for the boiler water pressure drop.
For multiple boiler systems:
» A check valve is required per boiler. Motorized isolation valves are not
an acceptable substitute for check valves.
» Use 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.
» Use a reverse return primary header to balance ow across the
boilers. Where reverse return cannot be used, it is recommended to
install a balancing valve per boiler.
Meet Water Chemistry Requirements
System water chemistry requirements are as follows:
pH: Range of 8.5 - 10.5
Oxygen: Less than 250 ppb (operating condition)
Total Iron/Copper: Less than 5 ppm
! WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct,
and strict adherence to applicable
jurisdictional/professional codes and
regulations.
Do not use matches, candles, ame or
other sources of ignition to check for
gas leaks.
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