14
Commercial Hybrid System
Installation of 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.
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.
Water discharged from the pressure relief valve could
cause severe burns instantly or death from scalds.
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.
Temperature-Pressure Relief Valve
Requirements
WARNING
