Bradford-White Corp 07.05.228.00 manual Temperature/Pressure Relief Valves Pressure Reducing Valve

INSTALLATION

Temperature/Pressure Relief Valves					Pressure Reducing Valve
For protection against excessive pressures and temperatures in
the booster heater, install temperature/pressure protective						CAUTION
equipment required by local codes. The temperature/pressure
					If water supply pressure to the booster water heater inlet
relief valve supplied with this booster water heater is
constructed with brass working parts and heat resistant silicone					is over 20 psi (138 kPa) during flow, install a commercial-
seat discs.					grade pressure reducing valve with built-in bypass for
					proper operation of dish machine rinse nozzles.
			WARNING		NOTE: The pressure reducing valve must be the type
Temperature/pressure			protective equipment should not be		equipped with a high pressure bypass like the valve
less than a combination temperature/pressure relief valve					supplied with this booster water heater.
certified by a nationally recognized testing laboratory that					Proper operation of the commercial dish machine rinse nozzles
maintains periodic inspection of the production of this					requires that available water pressure at the rinse nozzle be
equipment and meets the requirements for Relief Valves					between 15 and 25 psi (103 and 172 kPa) when the nozzle is
and Automatic Shutoff Devices for Hot Water Supply					operated. 20 psi (138 kPa) is recommended. If water pressure
Systems, ANSI Z21.22-1979. The temperature/pressure					available to the booster water heater inlet is over 20 psi
relief valve must be marked with a minimum set pressure					(138 kPa), a pressure reducing valve must be installed in the hot
not to exceed the marked hydrostatic test pressure of the					water supply line to the booster water heater and adjusted to
booster heater as noted on the unit specifications.					deliver 20 psi (138 kPa) flow pressure.
FOR INSTALLING COMBINATION TEMPERATURE/					The valve supplied with the unit has a built-in high pressure
PRESSURE RELIEF VALVES IN ACCORDANCE WITH					bypass that prevents excessive pressure build-up as the
AMERICAN NATIONAL STD. Z21.22-1979. Combination					booster heats up. Final adjustment is required at the time of
temperature/pressure relief valves with extension					installation.
thermostats must be installed so that the temperature-					Temperature/Pressure Gauges
sensing element is immersed in the water within the top 6"
(152 mm) of the tank. They must be installed either in the
hot outlet service line or directly in a tank tapping.						CAUTION
Combination temperature/pressure relief valves that do
					Bradford White requires that two temperature/pressure
not have extension elements must be mounted directly in
a tank tapping located within the top 6" (152 mm) of the					gauges be installed to assure proper operation. Install one
tank, and shall be adequately insulated and located so as					in the supply line before the pressure reducing valve and
to assure isolation from the flue gas heat or other ambient					one in the outlet line as close to the booster water heater
conditions that are not indicative of stored water					as possible. This provides a visual check of the water
temperature. TO AVOID WATER DAMAGE OR SCALDING					temperature and pressure before and after the water
DUE TO VALVE OPERATION, DRAIN PIPE MUST BE					heater.
CONNECTED TO VALVE OUTLET AND RUN TO A SAFE					NOTE: If a check valve is installed and cannot be removed
PLACE OF DISPOSAL. Discharge line must be as short as					install a back pressure relief valve set at 125 psi (862
possible and be the same size as the valve discharge					kPa) on the incoming line between the pressure
connection throughout its entire length. Drain line must					reducing valve and the inlet to the booster water
pitch downward from the valve and must terminate					heater. Discharge must be to open site drain (see
between 1-1/2" (38 mm) and 6" (152 mm) above the floor					Figure 7).
drain where any discharge will be clearly visible. The drain
line shall terminate plain, not threaded, with material					Blended Phosphate Water Treatment
greater. Excessive length, over 30' (9144 mm), or use of					System (optional)
serviceable for temperatures up to 250°F (121°C) or					Bradford White recommends that the Blended Phosphate Water
more than four elbows can cause a restriction and reduce
the discharge capacity of the valve. No shut-off valve shall					Treatment System be installed with unions on the incoming 3/4"
be installed between the relief valve and tank, or in the					water supply line after the pressure reducing valve and before
drain line. Valve lever must be tripped periodically to					the booster water heater.
assure that waterways are clear. This device is designated					Cartridges supplied have a usage rating of 100,000 gallons
for emergency safety relief and shall not be used as an					(378,541 liters) of water. To assure proper operation the
operating control. The valves are set to relieve at 150 psi					cartridges must be replaced when expired.
(1034 kPa) or when water temperature reaches 210°F					NOTE: Product failure caused by liming or sediment buildup is
(99°C). Read tag on valve for additional information.
					not covered under warranty.
			CAUTION
BURN HAZARD: Valves supplied with				this booster water
heater are designed for high temperature commercial
operation. Do not substitute these valves with valves
designed for domestic water heaters.
Do	not use an anti-siphon or check valves on incoming
water line.
		8				Form No. EBOOSTERBWM-1009