Armstrong FLO-RITE-TEMP 8120 Installation And Adjustment Instructions - Page 11
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Flo-Rite-Temp Tempered Water Systems
For Safety Shower/Eye Wash Stations
The problem which faces many companies
today is how to safely warm water to be used
effectively in a drench shower or safety shower
situation.
Storage tank units can run out of warm water
causing people to go into possible shock due to cold
water exposure or to end the shower before proper
flushing has taken place. Also, because the water in
the tank is only heated to a temperature range of 65
to 95 degrees F. there is the potential and risk of
legionella bacteria forming inside of the tank. Lastly,
tank systems are feedback systems which can cause
severe overheating of the water when thermostatic
elements fail causing personal injury.
The solution is to use the Armstrong Flo-Rite-
Temp tankless instantaneous feedforward water
heater in series with a self-contained fail safe thermo-
static mixing valve.
How The System Works
The system, when piped as shown in the
drawing, will provide a safe, continuous and depend-
able source of accurately controlled warm water.
Incoming cold water is heated between 120 to
130 degrees F by the Flo-Rite-Temp. (The unit is set
Option 1:
Water recirculation when heater is servicing a long run to the shower head, more than one shower
head, or piping is exposed to cold ambient temperatures
October 31, 2002 @ 3:15 pm
to provide a constant supply of hot water at an
adjusted set point within this temperature range,
usually the lowest set point of 120
The 120°F water can be piped to the Rada Z358
thermostatic mixing valve which will blend cold water
with the 120°F water to make the tepid water for the
safety shower/eye wash station. The Rada Z358
valve is equipped to allow cold water to the
showerhead in the event of hot water failure.
The Rada Z358 Mixing Valve (see Bulletin
ALIB-Z358-20) properly proportions the hot and cold
incoming water to obtain a preset delivery tempera-
ture to the drench shower head. Demand induced
changes are sensed and automatically compensated
for by the valve so that shower output temperature
remains constant. A recirculation system may also
be incorporated in this system and is especially
recommended in applications where shower lines are
exposed to the cold air or shower heads are a dis-
tance from the heater.
Feedforward control in the water heater elimi-
nates the danger of thermostatic element failure and
overheating typical in storage tank feedback systems.
Because there is no storage tank, there is no danger
of legionella forming in the stored warm water. All
water is heated instantaneously on the spot, there is
no shortage of heated water or shower time limits.
Fig. 11-1
11
degrees is used).
O