AERCO BMK 2.0 LN Nat. Gas - Manual (Page 14)

INSTALLATION
2-4
should be supported from floor, ceiling or walls
only and must not be secured to the unit.
A suitable piping compound, approved for use
with natural gas or propane, should be used.
Any excess must be wiped off to prevent
clogging of components.
To avoid damage to the unit, when pressure
testing gas piping, isolate the unit from the gas
supply piping. At no time should there be
more than 2 psi to the unit. Leak test all
external piping thoroughly for leaks using a soap
and water solution or suitable equivalent. The
gas piping must meet all applicable codes.
2.4.1 GAS SUPPLY SPECIFICATONS
− Natural Gas:
The maximum static pressure to the unit
must be no more than 2 psi. Minimum
natural gas operating pressure is 5.3“ W.C.
for FM gas trains & 5.5“ W.C. for IRI gas
trains when the unit is firing at maximum
input (2000 cfh). For Benchmark 2.0 Low
NOx boilers configured for De-Rated
capacity, the required minimum natural gas
operating pressure is 4.0” W.C. for FM gas
trains (4.2” W.C. for IRI gas trains) at maxi-
mum input of 1,750,000 BTU/hr (1750 cfh).
2.4.2 MANUAL GAS SHUTOFF VALVE
A 2” manual gas shut-off valve is furnished with
each unit. The valve should be positioned on the
inlet to the unit, as shown in Figure 2.5.
Figure 2.5
Manual Shut-Off Valve Location
2.4.3 IRI GAS TRAIN KIT
The IRI gas train is an optional gas train
required in some areas by code or for insurance
purposes. The IRI gas train is factory pre-piped
and wired.
2.5 ELECTRICAL SUPPLY
The AERCO Gas Fired Equipment Electrical
Power Wiring Guide, (GF-2060), must be
consulted in addition to the following material
before wiring to the unit is started. External AC
power connections are made to the unit inside
the power box on the front panel of the unit,
behind the removable front door (Figure 2.6).
NOTE:
All electrical conduit and hardware should
be installed so that it does not interfere with
the removal of any cover, inhibit service or
maintenance, or prevent access between
the unit and walls or another unit.
Figure 2.6
AC Input Terminal Location
2.5.1 ELECTRICAL REQUIREMENTS
The Benchmark Boiler is available in one three
different AC power configurations:
220 Vac/1 Phase/60 Hz @ 20 amps
208 Vac/3-Phase/60 @15 amps
460 Vac/3-Phase/60 Hz @ 15 amps