Table of Contents
Advertisement
6
System Plumbing
Pressure Relief Valve
Requirements
An approved pressure relief valve (preinstalled) 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 pressure 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.
•
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.
WARNING
Water discharged from the pressure relief valve could
cause severe burns instantly or death from scalds.
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.
Rinnai Commercial Hybrid System Installation and Operation Manual
PRV Temperature
Requirements
Install the Temperature-Pressure Relief (T&P) Valve
according to these instructions.
The tank portion of this system is provided with a
combination temperature-pressure relief valve. For safe
operation of the water heater, the relief valve(s) must not
be removed from its designated point of installation or
plugged.
An approved Temperature-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 T&P 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
T&P valve and the line.
•
Do not place any other type valve or shut off device
between the relief valve and the water heater.
•
Do not pipe temperature-pressure relief valve, pressure
relief valve, and/or condensate drain together into a
common pipe.
MUST DO
•
The T&P 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 T&P valve must be rated up to 150 psi and to at
least the maximum Btu/hr of the appliance.
•
The discharge from the T&P Valve should be piped to
the ground or into a drain system to prevent exposure
or possible burn hazards to humans or other plant or
animal life. Follow local codes. Water discharged from
the relief valve could cause severe burns instantly,
scalds, or death.
•
The Temperature-Pressure Relief Valve must be
manually operated once a year to check for correct
operation.
35
Advertisement
Table of Contents
