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BRADFORD WHITE
Page 8
B4 Volume Water Heater Page 9
Figure 9), must be piped, but not fastened, to a
drain or oor sink. The drain pipe must be the
same size as the valve outlet and must pitch
downward from the valve.
Special attention must be given to relief valve
settings in installations where the heater is
located on the ground oor of a tall building. The
static pressure of the system is elevated and could
cause the relief valve to leak. Where no special
setting of the relief valve is ordered, the factory
will furnish a 125 psi setting. Never reduce the
relief valve openings.
3. Pressure relief valve lever must be tripped at
least once a year to insure that waterways are
clean. When manually operating lever, water will
discharge through drain line. Precautions must be
taken to avoid contact with hot water and water
damage.
4. The weight of all water and gas piping should be
supported by suitable hangers or oor stands.
5. Check piping diagrams with local applicable
plumbing, heating and building safety codes.
6. All two-temperature systems using temperature
valves must have forced recirculation in the low
temperature building loop.
7. A check valve installed at the hot water inlet to
the tempering valve will prevent cold water from
being drawn in reverse through the tempering
valve into the hot water.
8. When installing a tempering valve, place at
bottom of antithermosyphon loop at least 24"
high to prevent excessive hot water from entering
mixed water supply. Bring the cold water supply
up from the oor to the valve (see Figure 10).
2.7 Water Expansion
When cold water is heated the water expands. If
no water is being used during the heat-up period the
expanded water will normally back up into the city
mains.
A water pressure reducing valve installed in the
incoming cold water line may act as a check valve and
prevent the expanded water from moving backward.
This will cause pressure to rise in the heater, which
will be relieved by the pressure relief valve.
If the relief valve pops frequently a mineral
deposit may build up on the valve seat, causing it to
leak.
The following suggestions may solve the
problem:
1. Install a properly sized expansion tank.
2. Replace the installed water pressure reducing valve
with a suitable valve having a back ow port. These
valves have a back ow port which allows water
to ow backwards when the pressure in the system
exceeds the pressure in the mains.
3. Install an auxiliary small relief valve set at 25 psi
less than the main relief valve. The valve must
be piped to a drain and may require occasional
cleaning. It will bleed off the expanded water
and protect the main pressure relief valve from
becoming fouled.
2.8 Pump Performance and Installation
1. The factory provided pumps on all Copper Brute
heaters are sized to provide proper circulation
through the heater and heater-to-tank circulation
loop (see Figures 11 and 12). If the heater-to-tank
circulating loop does not contain more than 6
elbows or 30 feet of pipe, use pipe ttings in the
loop no smaller than the following:
Model Pipe Size
500 through 850 2"
1010 through 1825 2-1/2"
Figure 9. Pressure Relief Valve Location.
Pressure
Relief
Valve
Hot
Water
Hot
Water
Storage
Tank Floor
Automatic
Tempering
Valve
Cold
Water
Tempered Water
24"
Figure 10. Tempering Valve Installation.