Rinnai RL94e REU-VC2837WD-US User Manual

20 VCSeriesManual
Sizethegaspipe
ThegassupplymustbecapableofhandlingtheenƟre
gasloadatthelocaƟon.Gaslinesizingisbasedon
gastype,thepressuredropinthesystem,thegas
pressuresupplied,andgaslinetype.ForgaspipesizͲ
ingintheUnitedStates,refertothe
NaƟonal Fuel Gas
Code, NFPA 54.ThebelowinformaƟonisprovidedas
anexample.TheappropriatetablefromtheapplicaͲ
blecodemustbeused .
1. Forsometables,youwillneedtodeterminethe
cubicfeetperhourofgasrequiredbydividingthe
gasinputbytheheaƟngvalueofthegas
(availablefromthelocalgascompany).Thegas
inputneedstoincludeallgasproductsat
theloͲ
caƟonandthemaximumBTUusageatfullload
whenallgasproductsareinuse.
2. Usethetableforyourgastypeandpipetypeto
findthepipesizerequired. Thepipesizemustbe
abletoprovidetherequiredcubicfeetperhour

ofgasortherequiredBTU/hour.
Example:
TheheaƟngvalueofnaturalgasforyourlocaƟonis
1000BTU/FT
3
.ThegasinputoftheRL94iis199,000
BTU/HR.AddiƟonalappliancesatthelocaƟonrequire
65,000BTU/hr.Thereforethecubicfeetperhour=
(199,000+65,000)/1000=264FT
3
/HR.Ifthepipe
lengthis10feetthenthe3/4inchpipesizeiscapable
ofsupplying264FT
3
/HRofnaturalgas.
GasInputofallgasproducts(BTU/HR)
HeaƟngValueofGas(BTU/FT
3
)
CubicFeet
perHour=
(CFH)
x Anycompoundusedonthethreadedjointofthe
gaspipingshallbeatypewhichresiststheacƟon
ofliquefiedpetroleumgas(propane/LPG).
x ThegassupplylineshallbegasƟght,sized,andso
installedastoprovideasupplyofgassuĸcientto
meetthemaximumdemandoftheheaterandall
othergasconsumingappliancesatthelocaƟon
withoutlossofpressure.
INFORMATION
x Refertoanapprovedpipesizingchartifindoubt
aboutthesizeofthegasline.
Length
PipeSize(inches)
3/4 1 11/4 11/2
10 273 514 1060 1580
20 188 353 726 1090
30 151 284 583 873
40 129 243 499 747
50 114 215 442
 662
60 104 195 400 600
70 95 179 368 552
80 89 167 343 514
90 83 157 322 482
100 79 148 304 455
PipeSizingTableͲNaturalGas
InletPressure: lessthan2psi(55inchesW.C.)
PressureDrop: 0.3inchesW.C.
SpecificGravity: 0.60
Schedule40MetallicPipe
cubicfeetperhour
Length
PipeSize(inches)
1/2 3/4 1 11/4
10 291 608 1150 2350
20 200 418 787 1620
30 160 336 632 1300
40 137 287 541 1110
50 122 255 480 985
60 110 231 434 892
80 101 212 400 821
100 94 197 372 763
PipeSizingTableͲPropaneGas
InletPressure: 11.0inchesW.C.
PressureDrop: 0.5inchesW.C.
SpecificGravity: 1.50
Schedule40MetallicPipe
CapacityinThousandsofBTUperHour

Rinnai RL94e REU-VC2837WD-US Specifications

General

Type	Tankless
Installation	Indoor
Energy Source	Natural Gas or Propane
Flow Rate	9.4 GPM
Energy Factor	0.82
Gas Type	Natural Gas or Propane
Minimum Flow Rate	0.4 GPM
Voltage	120V
Ignition Type	Electronic
Maximum BTU	199, 000 BTU
Temperature Range	98°F to 140°F
Minimum BTU Input	15, 000 BTU/hr
Warranty	12 years heat exchanger, 5 years parts, 1 year labor