AAON BL-600 - Manual (Page 20)

20
Water Connection
Connect the supply and return water lines.
The connection size is listed on the unit
rating sheet, along with the designed
volumetric flow rate. The maximum
operating pressure for AAON BL Series
units is 125 psi.
Gas Connection
Size the gas piping to supply the unit with
proper pressure when all gas consuming
devices in the building connected to the
same gas system are operating. The
maximum gas train inlet pressure for all
boiler sizes is 5 psig. The minimum gas train
inlet pressure for the 500 MBH boiler is 5
inches of water column, and for all other
boilers, 7 inches of water column.
Carefully consider all current and future gas
usage. Table 3 details the input rate for each
boiler unit.
Gas connection sizes are listed on the unit
rating sheet.
Table 3 - Boiler Rated Input Capacity
Boiler Size
Rated Capacity (CFH)*
Natural LP/Propane
500 MBH 500 200
750 MBH 750 300
1000 MBH 1000 400
1500 MBH 1500 600
*Note: Rating is for sea level conditions.
For additional information regarding the gas
piping
connection, see the Thermal
Solutions Boiler “Installation, Operating,
and Service Instructions” that are included
with the unit.
Boiler Exhaust Connection
In addition to gas connection installation,
each boiler requires installation of the
exhaust vent piping and inlet vent hood. The
exhaust panel with chimney cutout is
removed for shipping, and replaced with a
shipping cover.
Remove the shipping cover and attach the
exhaust panel shipped with the unit. When
the exhaust panel is securely fastened with
sheet metal screws, locate the exhaust piping
that is also shipped along with the unit. The
exhaust piping that must be attached to the
internal exhaust vent piping includes the
vent length, 90 degree elbow and rain cap.
Examine
all components prior to
installation. The female end of each vent
pipe component incorporates a sealing
gasket and a mechanical locking band.
Boilers must be operated only with
liquid flowing through boiler.
WARNING
PVC (Polyvinyl Chloride) and CPVC
(Chlorinated Polyvinyl Chloride) are
vulnerable to attack by certain
chemicals. Polyolester (POE) oils
used
with R-410A and other
refrigerants, even in trace amounts,
in a PVC or CPVC piping system will
result in stress cracking of the piping
and fittings and complete piping
system failure.
CAUTION