Installation Of Plumbing - Rinnai RLX94i Installation And Operation Manual

Installation of Plumbing

Pressure Relief Valve Requirements
Install the pressure relief valve according to these
instructions.
An approved pressure relief valve is required by the
American National Standard (ANSI Z21.10.3) for all
water heating systems and shall be accessible for
servicing.
DO NOT

Do not plug the relief valve and do not install any
reducing fittings or other restrictions in the relief
line. The relief line should allow for complete
drainage of the valve and the line.

Do not place any other type valve or shutoff device
between the relief valve and the water heater.
MUST DO

The relief valve must comply with the standard for
Relief Valves and Automatic Gas Shutoff Devices for
Hot Water Supply Systems ANSI Z21.22 and /or the
standard Temperature, Pressure, Temperature and
Pressure Relief Valves and Vacuum Relief Valves,
CAN1-4.4.

The relief valve must be rated up to 150 psi and to
at least the maximum BTU/hr of the appliance.

The discharge from the pressure relief valve should
be piped to the ground or into a drain system per
local codes.

The pressure relief valve must be manually
operated once a year to check for correct
operation.
WARNING
Water discharged from the pressure relief valve could
cause severe burns instantly or death from scalds.

The relief valve should be added to the hot water
outlet line and near the hot water outlet according
to the manufacturer's instructions. DO NOT place
any other type valve or shut off device between
the relief valve and the water heater.
16
INFORMATION

If a relief valve discharges periodically, this may be
due to thermal expansion in a closed water supply
system. Contact the water supplier or local
plumbing inspector on how to correct this
situation. Do not plug the relief valve.

The American National Standard (ANSI Z21.10.3)
does not require a combination temperature and
pressure relief valve for this appliance. However,
local codes may require a combination
temperature and pressure relief valve.
Isolation Valves
Isolation valves are included with this water heater.
Rinnai strongly recommends the installation of
isolation valves on the cold and hot water lines
because they provide the ability to isolate the water
heater from the structure's plumbing and allow quick
access to flush the heat exchanger. Flushing the heat
exchanger regularly is required as part of the proper
maintenance for this water heater.
Piping Requirements
A manual water control valve must be placed in the
water inlet connection to the water heater before it is
connected to the water line. Unions may be used on
both the hot and cold water lines for future servicing
and disconnection of the unit.
DO NOT

Do not introduce toxic chemicals such as those
used for boiler water treatment to the potable
water used for space heating.
MUST DO

The piping (including soldering materials) and
components connected to this appliance must be
approved for use in potable water systems.

Purge the water line to remove all debris and air.
Debris will damage the water heater.

If the appliance will be used as a potable water
source, it must not be connected to a system that
was previously used with a nonpotable water
heating appliance.

Ensure that the water filter on the water heater is
clean and installed.
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