Installation Sheet

50 Rinnai Tankless Water Heater Installaon and Operaon Manual
Gas connecon 3/4 in.
MNPT connecon
To connect the gas supply, follow the instrucons below:
1. Install a manual gas control valve 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 water heater.
2. Check the type of gas and gas supply 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 water heater to match the gas type.
3. 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 secon “2.5 Specicaons” with all gas
appliances operang.
4. Before placing the appliance in operaon, all joints including the heater must be checked for gas
ghtness by means of soap, gas leak detector soluon, 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.)
5. Use approved connectors to connect the water heater to the gas line. Purge the gas line of any debris
before connecon to the water heater.
6. 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).
7. 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 the “Gas Pipe Sizing Reference
Tables” secon on the next page.
8. Perform a leak and pressure test prior to operang the water heater. If a leak is detected, do not operate
the water heater unl the leak is repaired.
WARNING
• A licensed professional must install the gas supply.
• Turn o 120V power supply.
• Turn o the gas.
• Gas is ammable. Do not smoke or provide other ignion sources while working with gas.
• Do not turn on the water heater or gas unl all fumes are gone.
3.10 Connect the Gas Supply
Instrucons