AERCO BMK 3.0 LN Nat. Gas Jan 2011 - Manual (Page 15)

INSTALLATION
2-3
2.4.3 Removal of Support Rod
Prior to ins tallation of w ater supply a nd return
piping, the 24” threaded rod shown in Figure 2-3
must be r emoved. T his r od is installed pr ior to
shipment from the f actory to prevent damage to
the ins ulated m etal f lex h ose on the hot water
supply outlet of the boiler. In order to install the
water s upply piping, th is r od m ust be r emoved
as follows:
1. Refer to Figure 2-3 and back off the hex nut
on the outlet side of the flex hose.
2. Next, disconnect the coupling nut from the
flange stud.
3. Completely remove the threaded rod, hex
nut and coupling nut from the boiler.
5/8-11 x 24" LONG
THREADED ROD
5/8-11
HEX NUT
5/8-11
COUPLING NUT
EXHAUST
MANIFOLD
OUTLET
FLANGE
INSULATED
FLEX HOSE
(SEE IMPORTANT
NOTE BELOW)
PARTIAL TOP VIEW - REAR
Figure 2-3
Location of Threaded Support Rod
IMPORTANT
THE IN SULATED F LEX H OSE
SHOWN IN FIG URE 2- 3 M UST BE
LEVEL O R SLO PING UPWARD AS
IT EXITS THE BOILER. FAILURE TO
PROPERLY PO SITION T HIS HO SE
MAY CAUSE I NEFFECTIVE AI R
ELIMINATION R ESULTING IN E LE-
VATED T EMPERATURES THAT
COULD CO MPROMISE T HE TOP
HEAD GASKET.
2.4.4 Removal of Strap and Packing
Material From Heat Exchanger
Prior to c onnecting th e ex ternal g as s upply or
electrical po wer to t he unit. the s trap and
packing material must be r emoved from the top
of the primary he at exchanger. T his m aterial is
located i n the area of the ig nitor-injector an d
staged ignition solenoid on the b urner assembly
This c an be eas ily accomplished b y r emoving
the top panel nearest to the front of the unit.
2.5 SUPPLY AND RETURN PIPING
The Benc hmark 3.0 B oiler uti lizes 4” 1 50#
flanges f or the water s ystem s upply a nd r eturn
piping connections. The physical location of the
supply and return piping connections are on the
rear of the unit as shown in Figure 2-4. Refer to
Appendix F, Dr awing A P-A-811 f or ad ditional
dimensional data.
BOILER SUPPLY
4" – 150# FLANGED
CONNECTION
BOILER RETURN
4" – 150# FLANGED
CONNECTION
2" GAS INLET
CONNECTION
SHELL DRAIN
VALVE
EXHAUST
MANIFOLD
REAR VIEW
Figure 2-4
Supply and Return Locations
2.6 CONDENSATE DRAINS
The Benc hmark 3.0 Boi ler is d esigned t o
condense water vapor f rom the f lue pr oducts.
Therefore, the ins tallation must have pr ovisions
for suitable condensate drainage or collection.
Two condensate drain connections are provided
on th e r ear of the u nit as shown i n F igure 2- 5.
One drain connection is located on the exhaust
manifold and th e oth er is loc ated on th e
connecting manifold.
The drain at th e bottom of the exhaust manifold
also i ncludes a c ondensate tr ap c ontaining a
float assembly. When condensate collects in the
exhaust m anifold, th e f loat r ises, ther eby
allowing i t to dis charge thr ough t he dr ain
opening. T he dr ain p ipe loc ated on t he
connecting m anifold m ust be c onnected to a
second c ondensate tr ap whic h is pac ked
separately within the unit’s shipping container.