PLATINUM
WATER HEATER
18 PV500-37C 06/12
9.3 Relief Valve
PLATINUM
®
water heaters are supplied with a combination temperature and pressure relief valve sized in
accordance with ASME Boiler and Pressure Vessel Code, Section IV. (Optional AGA-rated relief valve is
available when required by local code) The water heater must not be operated without a correctly installed,
properly sized and properly operating relief valve. If a replacement relief valve is required, it must be of the
automatic reset type combination temperature-pressure relief valve complying with the Standard for Relief
Valves for Hot Water Supply Systems, ANSI Z21.22 / CSA 4.4, must not be less than the hourly Btu input rating
of the water heater as stated on the information decal located on the front control panel and must not have a
relieving pressure exceeding the 160 psi maximum working pressure of the water heater.
The relief valve(s) must be threaded directly into the dedicated relief valve fitting located in the top of the tank
and the relief valve discharge must be plumbed to an appropriate floor drain. The discharge line must allow
complete drainage of the valve and line. Relief valves should be manually operated at least once a year and if it
fails to freely discharge water or fails to reseat following testing, it must be replaced with a like relief valve as
described above.
WARNING: Do not install a reducing coupling, valve or other restriction between the tank and the relief
valve or between the relief valve discharge and a suitable floor drain. Such restriction could prevent the
valve from fully relieving if temperature or pressure settings are exceeded, which could result in
property damage, violent tank expansion or bursting, exposure to hazardous materials, personal injury
or death.
WARNING: The relief valve discharge must be piped to a suitable floor drain to avoid exposure to hot
discharge water during relief valve operation. Exposure to hot discharge water can cause water damage
and/or burns resulting in property damage, personal injury or death.
9.4 Thermal Expansion
A relief valve that discharges periodically may be due to thermal expansion in a closed system, such as a water
heater installed in a system closed by components, such as a backflow preventer or check valve in the cold
water supply or a closed heating loop. These systems must be provided with means to control expansion.
Contact a boiler or plumbing professional to resolve this situation. Do not plug the relief valve.
9.5 Low Water Cutoff (if equipped)
Low water cutoffs must be installed when required by the authority having jurisdiction. Proper function of low
water cutoffs should be verified every six months.
9.6 Temperature Adjustment
This unit has an adjustable thermostat to control water temperature. See temperature adjustment procedure in
this manual. The thermostat is factory pre-set at approximately 120°F. Households with small children or
disabled individuals may require 120
º
F or lower temperature setting to reduce risk of scald injury. Set the
thermostat or program the temperature control to the lowest settings that will satisfy hot water demands and
prevent risk of scald injury. Some states may require a lower temperature setting. Check for local requirements
governing the temperature setting. Remember, no water heating system will provide exact temperature at all
times. Allow a few days of operation at this setting to determine the correct temperature setting consistent with
your needs.
NOTE: (1) This water heater, when set at the
lower temperature setting, is not capable of
producing hot water of sufficient temperature
for sanitizing purposes. (2) Higher stored water
temperature increases the ability of the water
heater to supply desired quantities of hot
water, however remember: WARNING: Hotter
water increases the risk of scald injury.
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