Installation Guide

54 Rinnai Tankless Water Heater Installation and Operation Manual
To connect the gas supply, follow the
instructions below:
1. Install a manual gas control valve in the
gas supply line to the water heater. A
union can be used on the connection
above the shut off valve for the future
servicing or disconnection of the water
heater.
2. Check the type of gas and gas supply
pressure before connecting 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 location
provided by the gas company. Supplied
gas pressure must be within the limits
shown in section “3.4 Specifications”
with all gas appliances operating.
4. Before placing the appliance in
operation, all joints including the heater
must be checked for gas tightness by
means of soap, gas leak detector
solution, or an equivalent nonflammable
solution, as applicable. (Since some
leak test solutions, including soap and
water, may cause corrosion or stress
cracking, the piping shall be rinsed with
water after testing, unless it has been
determined that the leak test solution is
non-corrosive.)
5. Use approved connectors to connect
the water heater to the gas line. Purge
the gas line of any debris before
connection to the water heater.
6. Any compound used on the threaded
joint of the gas piping shall be a type
that resists the action of liquefied
petroleum gas (propane/LPG).
7. The gas supply line shall be gas tight,
sized, and so installed as to provide a
supply of gas sufficient to meet the
maximum demand of the water heater
and all other gas consuming appliances
at the location without loss of pressure.
If in doubt about the size of the gas
line, refer to the “Gas Pipe Sizing
Reference Tables” section on the next
page.
8. Perform a leak and pressure test prior
to operating the water heater. If a leak is
detected, do not operate the water
heater until the leak is repaired.
Gas connection 3/4 in.
MNPT connection
• A trained and qualified professional must
install the gas supply.
• Turn off 120V power supply.
• Turn off the gas.
• Gas is flammable. Do not smoke or
provide other ignition sources while
working with gas.
• Do not turn on the water heater or gas
until all fumes are gone.
• Confirm the gas type before connecting.
Failure to install correct gas type may
result in injury or damage to the unit.
WARNING
Figure 52