Rinnai V3237FFU - Manual (Page 39)

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Rinnai Corporation V3237 Models
PRESSURE RELIEF VALVE
1) An approved pressure relief valve should be installed in all water heating systems.
2) The pressure relief valve must meet the following criteria: 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 CAN1-4.4 Temperature, Pressure, Temperature
and Pressure Relief Valves and Vacuum Relief Valves. This relief valve set point must not
exceed 150 PSI of pressure. The pressure relief valve hourly Btu rated temperature steam
discharge capacity shall not be less than the hourly Btu input rating of the unit. Multiple
valves may be used.
3) The relief valve should be added to the hot water outlet line per manufacturer's instructions.
DO NOT place any other type valve or shut off device between the relief valve and the hot
water heater.
4) 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.
5) 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.
6) Should overheating occur or the gas supply fail to shut off, turn off the manual gas valve on
the Rinnai.
GAS PRESSURE CHECK LIST
1) Remove pressure test point screw, attach pressure gauge to test point.
2) Turn on the gas and power to the water heater.
3) Open any hot water tap fully.
4) Check test point or supply pressure in water columns per inch as shown.
REU-V3237FFU Series
REU-V3237W Series
Inlet Gas Pressure
6" - 10.5"
6" - 10.5"
Low Fire Manifold Gas Pressure
0.67"
0.65"
High Fire Manifold Gas Pressure
3.0"
2.8"
Natural Gas Inlet and Manifold Gas Pressure by Model
REU-V3237FFU Series
REU-V3237W Series
Inlet Gas Pressure
10" - 13.5"
10" - 13.5"
Low Fire Manifold Gas Pressure
0.83"
0.80"
High Fire Manifold Gas Pressure
3.7"
3.8"
Propane Gas Inlet and Manifold Gas Pressure by Model