Operating instructions

13
Part Number 550-142-784/0812
GWA Series 2 Gas-Fired Water Boilers – Boiler Manual
Figure 10 Gas supply piping
Table 5 Pipe capacity for 0.60 specic gravity natural gas
4 Install gas piping
Natural Gas:
1. See Table 5forpipelengthanddiameter.Baseonratedboiler
input(divideby1,000toobtaincubicfeetperhour).Table5
isonlyforgaswithspecicgravity0.60,withapressuredrop
throughthegaspipingof0.30”w.c.Foradditionalgaspipe
sizinginformation, seeANSIZ223.1(B149.1 orB149.2for
Canadianinstallations).
2. Inletpressurerequiredatgasvalveinlet:
• Maximum:13”w.c.
• Minimum:5”w.c.
• Manifoldgaspressure:3.5”w.c.
3. Install100%lockupgaspressureregulatorinsupplylineif
inletpressureexceeds13”w.c.Adjustfor13”w.c.maximum.
Propane Gas:
1. Contactgassuppliertosizepipes,tanksand100%lockup
gas pressure regulator.
2. Adjustpropanesupplyregulatorprovidedbygassupplierfor
13”w.c.maximumpressure.
3. Inletpressurerequiredatgasvalveinlet:
• Maximum:13”w.c.
• Minimum:11”w.c.
• Manifoldgaspressure:10”w.c.
1. RemovejacketfrontpanelandseeFigure10topipegasto
boiler.
a. Installdriplegatinletofgasconnectiontoboiler.Where
localutilityrequiresdriplegtobeextendedtotheoor,
useappropriatelengthofnipplebetweencapandtee.
b. Installgroundjointunionforservicing,whenrequired.
c. Installmanualshutoffvalveingassupplypipingoutside
boiler jacket when required by local codes or utility
requirements.
d. InCanada—Whenusingmanualmainshutoffvalve,it
must be identified by the installer.
2. Support piping with hangers, not by boiler or its accessories.
3. Purgeallairfromgassupplypiping.
4. Beforeplacingboilerin operation,checkboiler and its gas
connectionforleaks.
a. Close manual main shutoff valve during any pressure
testing at less than 13” w.c.
b. Disconnectboilerandgasvalvefromgassupplypiping
during any pressure testing greater than 13” w.c.
 Donotcheckforgasleakswithanopename—Use
bubbletest.Failuretousebubbletestorcheckfor
gasleakscancauseseverepersonalinjury,death
or substantial property damage.
5. Usepipedopecompatiblewithpropanegases.Applysparingly
onlytomalethreadsofpipejointssothatpipedopedoesnot
blockgasow.
Failure to apply pipe dope as described in this
manual can result in severe personal injury, death
or substantial property damage.
Connecting gas supply piping to boiler
Gas pipe
length
(feet)
Capacity of pipe for pipe size of:
(Capacity in standard 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 56 115 215 440 670
75 45 93 175 360 545
100 38 79 150 305 460
150 31 64 120 250 380