AERCO BMK 2.0 LN Nat. Gas June 2010 - Manual (Page 16)

INSTALLATION
2-4
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.
FLOAT
THUMB
SCREWS
(4)
3/4 NPT
PORT
INLET
OUTLET
3/4 NPT
PORT
COVER
Figure 2-5
Condensate Trap Cut-Away View
2.7 GAS SUPPLY PIPING
The AERCO Benchmark 2.0LN Gas
Components and Supply Design Guide, GF-
2030LN must be consulted prior to designing or
installing any gas supply piping.
WARNING
NEVER USE MATCHES, CANDLES,
FLAMES OR OTHER SOURCES OF
IGNITION TO CHECK FOR GAS
LEAKS
.
CAUTION
Many soaps used for gas pipe leak
testing are corrosive to metals. There-
fore, piping must be rinsed thoroughly
with clean water after leak checks
have been completed.
NOTE
All gas piping must be arranged so that it
does not interfere with removal of any
covers, inhibit service/maintenance, or
restrict access between the unit and
walls, or another unit.
A 2 inch gas inlet connection is located on the
rear of the unit as shown in Figure 2-3.
Prior to installation, all pipes should be de-
burred and internally cleared of any scale, metal
chips or other foreign particles. Do Not install
any flexible connectors or unapproved gas
fittings. Piping must be supported from the floor,
ceiling or walls only and must not be supported
by the unit.
A suitable piping compound, approved for use
with natural gas, should be used. Any excess
must be wiped off to prevent clogging of
components.
To avoid unit damage when pressure testing gas
piping, isolate the unit from the gas supply
piping. At no time should the gas pressure
applied to the unit exceed 2 psi. Leak test all
external piping thoroughly using a soap and
water solution or suitable equivalent. The gas
piping used must meet all applicable codes.
2.7.1 Gas Supply Specifications.
The maximum static gas supply pressure to the
unit must not exceed 2 psi. The specifications
for natural gas and propane are as follows:
Natural Gas:
The gas supply pressure to the unit must be
of sufficient capacity to provide 2000 cfh
while maintaining the gas pressure at 4.0"
W.C. for FM or 5.0" W.C. for IRI gas trains.
Propane:
The gas supply pressure to the unit must be
of sufficient capacity to provide 800 cfh while
maintaining the gas pressure at 4.0" W.C. for
FM or 5.0" W.C. for IRI gas trains.
2.7.2 Manual Gas Shutoff Valve
A manual shut-off valve must be installed in the
gas supply line upstream of the Boiler as shown
in Figure 2-6. Maximum allowable gas pressure
to the Boiler is 2 psi.
NOTE
Paragraph 2.7.3 applies only to bolier
installations within the Commonwealth of
Massachusetts.
2.7.3 External Gas Supply Regulator
For Massachusetts installations, a mandatory
external gas supply regulator must be positioned
as shown in Figure 2-6. The gas supply
regulator must be properly vented to outdoors.
Consult the local gas utility for detailed
requirements concerning venting of the the
supply gas regulator.