Weil-McLain CGA25SPDN Boiler User Manual


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GOLD CGa Gas-Fired Water Boiler — Boiler Manual
26
Part Number 550-101-009/0107
Gas piping
Natural Gas:
1. Refer to 4ABLEFORPIPELENGTHANDDIAMETER"ASE
on rated boiler input (divide by 1,000 to obtain cubic
feet per hour).
4ABLE is only for gas with SPECIlC
GRAVITYWITHAPRESSUREDROPTHROUGHTHE
GASPIPINGOFvWC
For additional gas pipe
SIZINGINFORMATIONREFERTO!.3):OR"
OR"FOR#ANADIANINSTALLATIONS
2. Inlet pressure required at gas valve inlet:
s -AXIMUMvWC
s -INIMUMvWC
s -ANIFOLDGASPRESSUREvWC
 )NSTALLLOCKUPGASPRESSUREREGULATORINSUPPLY
line
IFINLETPRESSUREEXCEEDSvWC Adjust for
vWCMAXIMUM
Propane Gas:
 #ONTACTGASSUPPLIERTOSIZEPIPESTANKSAND
lockup gas pressure regulator.
2. Adjust propane supply regulator provided by gas
SUPPLIERFORvWCMAXIMUMPRESSURE
3. Inlet pressure required at gas valve inlet:
s -AXIMUMvWC
s -INIMUMvWC
s -ANIFOLDGASPRESSUREvWC
&IGURE Gas supply piping
Table 4 Pipe capacity for 0.60 specific gravity natural gas
Gas pipe
length
(feet)
Capacity of pipe for pipe size of:
(Capacity in cubic feet gas per hour)
½" ¾" 1" 1¼" 1½"
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 860
40 63 130 245 500 760
50 56 11 5 215 440 670
75 45 93 175 360 545
100 38 79 150 305 460
150 31 64 120 250 380
4
Connect gas supply piping to boiler
1. Remove jacket front panel and refer to &IGURE to pipe gas to boil-
er.
a.
)NSTALLDRIPLEG at inlet of gas connection to boiler. Where local
utility requires drip leg to be extended to the floor, use appropri-
ate length of pipe between cap and tee.
b.
)NSTALLGROUNDJOINTUNION for servicing, when required.
c.
)NSTALLMANUALSHUTOFFVALVE in gas supply piping outside boiler
jacket when required by local codes or utility requirements.
d.
)N#ANADA — When using manual main shutoff valve, it MUSTBE
IDENTIlED
by the installer.
2.
3UPPORTPIPING with hangers, not by boiler or its accessories.
3.
0URGEALLAIR from gas supply piping.
 "EFOREPLACINGBOILERINOPERATION
CHECKBOILERANDITSGASCONNEC
TIONFORLEAKS
.
a. #LOSEMANUALMAINSHUTOFFVALVE during any pressure testing at
LESSTHANvWC
b.
$ISCONNECTBOILERANDGASVALVEFROMGASSUPPLYPIPING dur-
INGANYPRESSURETESTINGGREATERTHANvWC
$ONOTCHECKFORGASLEAKSWITHANOPENmAME —
Use bubble test. Failure to use bubble test or check for
gas leaks can cause severe personal injury, death or
substantial property damage.
5.
5SEPIPEDOPECOMPATIBLEWITHPROPANEGASESApply sparingly
only to male threads of pipe joints so that pipe dope does not block gas
flow.
&AILURETOAPPLYPIPEDOPE as detailed above can result
in severe personal injury, death or substantial property
damage.
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