GF-135
Esteem 399 Low NOx Boiler
Chapter 5
OMM-0089_0A
Installation, Operation & Maintenance Manual
Boiler Piping
Page
34
of
188
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0089_0A
MC1 06/19/14
Ph.: 800-526-0288
primary/secondary piping arrangement or as per recognized design methods. Refer to the
expansion tank manufacturer instructions for additional installation details.
Connect the expansion tank to an air separator only if the air separator is located on the suction
side (inlet) of the system circulator. Always locate and install the system fill connection at the
same location as the expansion tank connection to the system.
5.8.1 Diaphragm Expansion Tank
Always install an automatic air vent on the top of the air separator to remove residual air from
the system.
5.8.2 Closed-Type Expansion Tank
It is recommended to pitch any horizontal piping upwards toward the expansion tank 1 inch per
5 feet of piping. Use 3/4” piping for the expansion tank to allow air within the system to rise.
WARNING!
Do not
install automatic air vents on a closed-type expansion tank
system. Air must remain in the system and be returned to the
expansion tank to provide an air cushion. An automatic air vent
would cause air to be vented from the system resulting in a water-
logged expansion tank.
5.9 CIRCULATOR
The Esteem boiler must be supplied with a Central Heating (CH) circulator. The circulator when
wired directly to the Esteem boiler will allow for domestic hot water priority and to provide
circulation for the freeze protection feature of the boiler control. See the charts in Figures B-1
and B-2 in Appendix B
for pressure drop and minimum flow rate through the boiler.
5.10 SIZING PRIMARY PIPING
See Figure 5-5 through Figure 5-10 on the following pages
for recommended piping
arrangements based on various applications. Size the piping and system components required
in the space heating system, using recognized design methods.
5.11 DOMESTIC HOT WATER SYSTEM PIPING
See Figure 5-5 through Figure 5-9 on the following pages for recommended piping to a DHW
system. This recommended piping configuration ensures priority is given to the production and
recovery of the DHW.
The piping for the DHW is separate from the boiler system piping and does not require a
primary / secondary piping configuration.
To wire the DHW circulator to the boiler control module, see Chapter 9, External Wiring.
5.12 SYSTEM PIPING - ZONE CIRCULATORS
Connect the Esteem boiler to the system piping as shown in Figure 5-5
when zoning with zone
circulators.
The installer must provide a separate circulator for each zone of space heating as well as the
boiler circulator.
