34
Rinnai Tankless Water Heater Installation and Operation Manual
4.8 Connect the Gas Supply
Figure 29
•
A trained and qualified professional must
install the gas supply.
•
Confirm the gas type before connecting.
Failure to install correct gas type may
result in injury or damage to the unit.
•
Turn off 120V power supply.
•
Turn off the gas.
•
Gas is flammable. DO NOT smoke or
provide other ignition sources while work
-
ing with gas.
•
DO NOT turn on the water heater or gas
until all fumes are gone.
4.8.1 Instructions
To connect the gas supply, follow the instructions
below:
1. Install a manual shutoff (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 “3.3
Specifications” with all gas appliances
operating. Install a proper gas regulator
upstream of a water heater if a supply gas
pressure is too high.
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
WARNING
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
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
