Rinnai M Series, Installation And Operation Manual

Page: 55 / 122

Rinnai M - Series Condensing Boiler Combi Manual 55
An approved pressure relief valve is required
by the
American National Standard (ANSI
Z21.13) and ASME Boiler and Pressure Vessel
Code, Section IV (Heating Boilers)
for all water
heating systems and shall be accessible for
servicing (an approved pressure relief valve is
supplied with the boiler). When connecting a
pressure relief valve, follow the guidelines
below:
•
The pressure relief valve must comply with
the standard for
Relief Valves and
Automatic Gas Shutoff 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,
Section IV (Heating 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 heating 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
operation.
•
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 fitted before any shut off 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
fittings or other restrictions 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
shutoff 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
situation. Do not plug the pressure relief
valve.
•
The American National Standard (ANSI
Z21.13) 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.
•
Protect pressure relief valve and pressure
relief valve discharge line from freezing.
Do not plug or restrict flow of the pressure
relief valve.
WARNING
IMPORTANT