AERCO BMK 3.0 LN Nat. Gas Jan 2011 - Manual (Page 17)

INSTALLATION
2-5
CONDENSATE
TRAP
CONNECTING
MANIFOLD
DRAIN
PIPE
3/4" NPT
NIPPLES
TO
FLOOR
DRAIN
CLAMP
1" I.D.
HOSE
ADAPTOR
Figure 2-6
Condensate Trap Installation
2.7 GAS SUPPLY PIPING
The AERCO Benchmark 3.0 Gas Components
and S upply Des ign G uide, G F-3030 m ust be
consulted prior to designing or installing any gas
supply piping.
WARNING
NEVER US E MATCHES, CANDLES,
FLAMES O R OT HER S OURCES O F
IGNITION TO CHECK FO R G AS
LEAKS .
CAUTION
Many soaps used f or gas pipe leak
testing are corrosive to metals. There-
fore, piping must be rinsed thoroughly
with clean water af ter leak chec ks
have been completed.
NOTE
All gas piping must be ar ranged so that it
does not i nterfere with r emoval of an y
covers, in hibit s ervice/maintenance, or
restrict ac cess bet ween the unit a nd
walls, or another unit.
A 2 inch gas inlet c onnection is l ocated o n th e
rear of the unit as shown in Figure 2-4.
Prior to i nstallation, al l p ipes s hould be d e-
burred and internally cleared of any scale, metal
chips or oth er f oreign particles. Do Not install
any f lexible c onnectors or unap proved gas
fittings. Piping must be supported from the f loor,
ceiling or walls only and must not be s upported
by the unit.
A s uitable p iping c ompound, appr oved f or us e
with natur al gas , should b e used. An y excess
must be wipe d of f to prevent c logging of
components.
To avoid unit damage when pressure testing gas
piping, is olate the unit f rom the gas s upply
piping. At no t ime s hould the g as pr essure
applied to th e un it ex ceed 2 ps i. Leak tes t al l
external p iping th oroughly us ing a s oap a nd
water s olution or s uitable equivalent. T he g as
piping used must meet all applicable codes.
2.7.1 Gas Supply Specification
The gas s upply input s pecifications to the unit
for Natural Gas are as follows:
The m aximum static pr essure to th e unit m ust
not exceed 2 psi. The gas supply pressure to the
unit m ust be of s ufficient c apacity to provide
3000 c fh whi le m aintaining the gas pr essure at
3.5” W.C. for FM or 4.0” for IRI gas trains.
2.7.2 Manual Gas Shutoff Valve
A manual shut-off valve must be ins talled in the
gas supply line upstream of the Boiler as shown
in Figure 2-7. Maximum allowable gas pressure
to the Boiler is 2 psi
NOTE
Paragraph 2.7. 3 applies onl y to bo lier
installations with in t he Co mmonwealth of
Massachusetts.
2.7.3 External Gas Supply Regulator
For Mas sachusetts installations, a m andatory
external gas supply regulator must be positioned
as s hown i n F igure 2- 7. T he gas s upply
regulator m ust be pr operly ve nted to out doors.
Consult th e l ocal gas uti lity f or det ailed
requirements c oncerning ve nting of the th e
supply gas regulator.
NOTE
The external regulator must be capable of
regulating 3, 00,000 BTU/HR of natur al
gas while m aintaining a g as pr essure to
the boiler of 3.5” W.C. for FM or 4.0” W.C.
for IRI gas trains.
CAUTION
A lock -up st yle r egulator M UST be
used w hen g as supply pr essure w ill
exceed 14” W.C.