Rinnai RUR98e (REU-KBP3237WD-US) Installation Manual download pdf (Page 46)

46 KBP Series Manual





 A manual gas control valve must be placed in the

gas supply line to the water heater. A union can be

used on the connecon above the shut o valve

for the future servicing or disconnecon of the

unit.

 Check the type of gas and the gas inlet pressure

before connecng the water heater. If the water

heater is not of the gas type that the building is

supplied with, DO NOT connect the water heater.

Contact the dealer for the proper unit to match the

gas type.

 Check the gas supply pressure immediately

upstream at a locaon provided by the gas

company. Supplied gas pressure must be within

the limits shown in the Specicaons secon of

this manual with all gas appliances operang.

 Before placing the appliance in operaon, all joints

including the heater must be checked for gas

ghtness by means of leak detector soluon, soap

and water, or an equivalent nonammable

soluon, as applicable. (Since some leak test

soluons, including soap and water, may cause

corrosion or stress cracking, the piping shall be

rinsed with water aer tesng, unless it has been

determined that the leak test soluon is non-

corrosive.)

 Use approved connectors to connect the unit to

the gas line. Purge the gas line of any debris

before connecon to the water heater.

General Instrucons

WARNING

1. A licensed professional must install the gas

supply.

2. Turn o 120v power supply.

3. Turn o the gas.

4. Gas is ammable. Do not smoke or provide other

ignion sources while working with gas.

5. Do not turn on the water heater or gas unl all

fumes are gone.

Size the gas pipe

The gas supply must be capable of handling the enre

gas load at the locaon. 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

sizing in the United States, refer to the Naonal Fuel

Gas Code, NFPA 54. The below informaon is provid-

ed as an example. The appropriate table from the

applicable 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 heang value of the gas

(available from the local gas company). The gas

input needs to include all gas products at the lo-

caon 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

nd 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 heang value of natural gas for your locaon is

1000 BTU/FT

. The gas input of the RUR98i is 199,000

BTU/HR. Addional appliances at the locaon require

65,000 BTU/hr. Therefore the cubic feet per hour =

(199,000 + 65,000) / 1000 = 264 FT

/HR. If the pipe

length is 10 feet then the 3/4 inch pipe size is capable

of supplying 264 FT

/HR of natural gas.

Gas Input of all gas products (BTU / HR)

Heang Value of Gas (BTU / FT

)

Cubic Feet

per Hour =

(CFH)

 Any compound used on the threaded joint of the

gas piping shall be a type that resists the acon of

liqueed petroleum gas (propane / LPG).

 The gas supply line shall be gas ght, sized, and so

installed as to provide a supply of gas sucient to

meet the maximum demand of the heater and all

other gas consuming appliances at the locaon

without loss of pressure.



 If in doubt about the size of the gas line, refer to an

approved pipe sizing chart

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