Installation Guide

Rinnai I-Series Condensing Boiler Combi Manual 59
An approved pressure relief valve is required
by the American Naonal Standard (ANSI
Z21.13) and ASME Boiler and Pressure Vessel
Code, Secon IV (Heang Boilers) for all water
heang systems and shall be accessible for
servicing (an approved pressure relief valve is
supplied with the boiler). When connecng a
pressure relief valve, follow the guidelines
below:
• The pressure relief valve must comply with
the standard for Relief Valves and
Automac Gas Shuto Devices for Hot
Water Supply Systems ANSI Z21.22, the
standard Temperature, Pressure,
Temperature and Pressure Relief Valves
and Vacuum Relief Valves, CAN1-4.4, and/
or the ANSI/ASME Boiler and Pressure
Vessel Code, Secon IV (Heang Boilers).
• The pressure relief valve must be rated up
to 150 psi for DHW systems, and to at
least the maximum Btu/hr of the
appliance.
• The pressure relief valve must be rated up
to 30 psi for central heang systems, 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
operaon.
• The discharge line from the pressure relief
valve should pitch downward and
terminate 6 in. (152 mm) above drains
where discharge will be clearly visible.
An ASME 30 psi safety pressure relief
valve is included with the boiler and
must be ed before any shut o valve
in the system.
• DO NOT plumb the pressure relief
valve with the condensate drain;
both must be plumbed
independently to drain.
• DO NOT plug the pressure relief
valve and do not install any reducing
ngs or other restricons in the
relief line. The pressure relief line
should allow for complete drainage
of the valve and the line.
• DO NOT place any other valve or
shuto device between the pressure
relief valve and the boiler.
Water discharged from the pressure relief
valve could cause severe burns instantly or
death from scalds.
• The discharge end of the line shall be plain
(unthreaded) and a minimum of 3/4 in.
nominal pipe diameter. The discharge line
material must be suitable for water at
least 180° Fahrenheit.
• If a pressure 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
situaon. Do not plug the pressure relief
valve.
• The American Naonal Standard (ANSI
Z21.13) does not require a combinaon
temperature and pressure relief valve for
this appliance. However, local codes may
require a combinaon temperature and
pressure relief valve.
• Protect pressure relief valve and pressure
relief valve discharge line from freezing.
Do not plug or restrict ow of the pressure
relief valve.
WARNING
IMPORTANT