Checklist For Plumbing; Installa On Of Gas Supply - Rinnai RL75i Installation And Operation Manual

Connect Water Heater to Water Supply
Water connec ons to the tankless water heater
should follow all state and local plumbing codes.
If this is a standard installa on, refer to the Piping
Diagram for Basic Installa on.
1. Plumb water supply to the tankless water heater
on the 3/4" MNPT connec on at the bo om of
the unit marked "Water Inlet", which is the cold
water supply.
2. Plumb the building hot water supply to the 3/4"
MSPT connec on marked "Water Outlet", which
is the hot water supply.
If a pipe cover will be installed, make sure water lines
to the water heater fit.

Checklist for Plumbing

□
Purge the water line of all debris and air by
closing the hot isola on valve and opening the
cold isola on valve and its drain. Debris will
damage the water heater. Use a bucket or hose
if necessary.
□
Ensure that hot and cold water lines are not
crossed to the unit and are leak free.
□
Ensure that a pressure relief valve is installed with
a ra ng that exceeds the BTU input of the water
heater model. Refer to the ra ng plate on the
side of the water heater for BTU input.
□
Clean the inlet water filter by closing the cold and
hot water inlet isola on (shut-off) valves. Put a
bucket under the filter at the bo om of the water
heater to catch any water that is contained inside
the unit. Unscrew the water filter. Rinse the
filter to remove any debris. Install the filter and
open the isola on valves.
□
Check for proper water pressure to the water
heater. Minimum/Maximum water pressure is
20-150 psi. Rinnai recommends 30-80 psi for
maximum performance.

Installa on of Gas Supply

WARNING
1. A licensed professional must install the gas
supply.
2. Turn off 120v power supply.
3. Turn off the gas.
4. Gas is flammable. 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.
General Instruc ons
MUST DO
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 off 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 Specifica 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 nonflammable
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.
VC Series Manual 19