AERCO BMK 2.0 LN Natural Gas 2008 - Manual (Page 13)

INSTALLATION
2-3
If installing a Combination Control Panel (CCP)
system, it is important to identify the
Combination Mode Boilers in advance and place
them in the proper physical location. Refer to
Chapter 5 for information on Combination Mode
Boilers.
2.5 SUPPLY AND RETURN PIPING
The Benchmark 2.0LN Boiler utilizes 4” 150#
flanges for the water system supply and return
piping connections. The physical location of the
supply and return piping connections are on the
rear of the unit as shown in Figure 2-3. Refer to
Appendix F, Drawing AP-A-841 for additional
dimensional data.
2" GAS INLET
CONNECTION
BOILER RETURN
4" – 150# FLANGE
CONNECTION
BOILER SUPPLY
4" – 150# FLANGE
CONNECTION
EXHAUST
MANIFOLD
SHELL
DRAIN
VALVE
REAR VIEW
Figure 2-3
Supply and Return Locations
2.6 CONDENSATE DRAIN AND PIPING
The Boiler is designed to condense water vapor
from the flue products. Therefore, the installation
must have provisions for suitable drainage or
collection. A 1/2” NPT drain connection is
provided on the exhaust manifold as shown in
Figure 2-4.
EXHAUST
MANIFOLD
1/2” NPT
CONDENSATE
DRAIN
CONNECTION
HOUSE-
KEEPING
PAD
BOILER
RETURN
Figure 2-4
Condensate Drain Connection Location
A separate condensate drain trap (part no.
24060) is shipped loose and must be installed
on the floor behind the unit. Connect the trap to
the exhaust manifold as follows:
1. First, install a 1/2” NPT nipple in the
condensate drain port shown in Figure 2.4.
2. Next, connect a 3/4-to-1/2” reducer to the
1/2” nipple.
3. Refer to Figure 2-5 and connect the
condensate drain trap to the exhaust
manifold as described in steps 4 through 7.
4. On the condensate drain trap, install 3/4”
NPT nipples in the tapped inlet and outlet of
the trap.
5. Attach a length of 1” I.D. polypropylene hose
between the exhaust manifold drain and the
inlet side of the condensate trap (Fig 2.5).
Secure both ends of the hose with clamps.
6. Connect a second length of 1” I.D. hose to
the outlet side of the condensate trap and
route it to a nearby floor drain.
7. Drainage from the condensate drain trap
outlet must be by gravity to a nearby floor
drain.
If a floor drain is not available, a condensate
pump can be used to remove the condensate to
drain. The maximum condensate flow rate is 20
GPH. The condensate drain trap, associated
fittings and drain line must be removable for
routine maintenance. DO NOT hard pipe.