FULTON Endura EDR 750 Nstallation, Operation And Maintenance Manual page 17

INSTALLATION
!
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, flame or
other sources of ignition to check for
gas leaks.
Tender No. MET21-117
2-10
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.
ƒ Motorized isolation valve control: Ensure flow paths in the hydronic loop
and residual heat in the pressure vessel is adequately dispersed when the
burner is disabled. The valve control system must be capable of leaving the
lead boiler valve open at all times.
ƒ Use a reverse return header to properly balance flow across the boilers
for multiple boiler systems: Where reverse return cannot be used, it is
recommended to install a balancing valve per boiler.
ƒ Do not install three-way mixing valves or minimim temperature protection:
This boiler does not have a minimum return water temperature
requirement.
ƒ 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 flow 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:
ƒ Typical shared piping methods include closely spaced tees, a buffer tank, or
a hydraulic separator.
ƒ When using closely spaced tees as a decoupling method, the tees should be
separated by four pipe diameters or less.
ƒ Install the dedicated boiler circulator on the inlet side of the Endura boiler,
pumping into the return connection. Select pump(s) with sufficient total
dynamic head for the pressure drop of the loop at design flow. See Figure 3
for the water side pressure drop through the boiler.
ƒ For multiple boiler systems:
» 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 properly balance flow across the
boilers. Where reverse return cannot be used, it is recommended to
install a balancing valve per boiler.
Design & Build RFP: Gas Heating Upgrade
Replacement in Dartmouth
SECTION 2
EDR-PURE-IOM-210617
Addendum #5 Page 17 of 105
© Fulton Group N.A., Inc. 2020