(2)
Testing the Mixing Valve
The mixing valve and the emergency fixtures it serves
should be tested weekly for proper operation.
Valve temperature test procedure is as follows:
1. Activate eye wash fixture to observe and record
the temperature of the dial thermometer. If the
temperature of the thermometer is not correct,
readjust the mixing valve according to the section
“Setting the Mixing Valve”.
2. Observe the flow from the emergency fixtures to
ensure an adequate flow of water.
In addition to testing for proper temperature, the cold
water by-pass and hot water shut down features of
the mixing valve should be tested weekly.
The test procedure is as follows:
1. Test valve temperature as described in Step 1
and Step 2 above.
2. Shut off the hot water supply to the mixing valve.
Observe the outlet flow from the emergency fix-
tures to ensure an adequate flow of cold water.
A slight drop in flow may occur after shutting
down the hot water supply to the mixing valve;
however, the drop should be minimal and for a
short duration.
3. Open the hot water supply to the mixing valve.
The thermometer should return to the set tem-
perature.
4. Shut off the cold water supply to the mixing valve.
The flow of water should shut down rapidly.
5. Open the cold water supply. The thermometer
should return to the set temperature.
Note: The thermometer should be checked at least
every six months.
Replacing the Thermostat Element
The thermostat replacement procedure is as follows:
1. Shut off the hot water supply and cold water
supply to the mixing valve.
2. Remove the four cover screws (#9) and remove
the front cover (#26) of the valve.
3. Remove thermostat (#11) from the valve body.
No special tools are necessary.
4. Insert a dowel rod, pencil (eraser-end), or narrow
pen into the open end of the thermostat. Push on
the dowel rod with your hand. If the thermostat
feels spongy or springy, the thermostat has lost
its charge. If the thermostat feels solid or hard,
the thermostat is good and operable.
5. Be sure that the stainless steel piston (#15)
moves freely up and down within the liner (#21).
Lime or calcium buildup should be cleaned with
vinegar, green scotch pad, or fine emery cloth.
DIMENSIONS:
1/2
″
inlets & outlets
Valve
Number
A
B
C
911E/F
9
″
4
″
8
″
PRESSURE DROP, POUNDS PER SQUARE INCH
FLOW OF WATER, GALLONS PER MINUTE
70
5
60
40
35
30
25
20
15
8
7
6
9
10
45
50
1
2
3
4
5
6
7 8 9 10
15
20
30
35
1/2
″
MED
CAPACITY OF TYPE 911E/F
THERMOSTATIC MIXING VALVE
FOR EMERGENCY SHOWERS
30
40
50
60
70 80
90
110
120
130
A
B
C
Note: Gallon per minute ratings may vary de-
pending upon incoming water temperatures and
pressures. Hot and cold water inlet pressures
must be equal.
Provisions shall be made to thermally isolate
the valve.
