Lawler 911 Instruction Manual

temperedwater.com
5330 East 25th St.
Indianapolis, IN 46218
Phone [phone]
Fax [phone]
INSTALLATION &
MAINTENANCE MANUAL
Design and specifications subject to change without notice.
Please refer to temperedwater.com to ensure most
current data sheet and other design solutions.
CAUTION: When maintaining and adjusting
the mixing valve, the delivered ushing uid
temperature shall be 60°F (15°C) to 95°F (35°C).
In circumstances where chemical reaction is
accelerated by ushing uid temperature, a medical
advisor should be consulted for the optimum
temperature for each application.
CAUTION: When maintaining and adjusting the
mixing valve, all xtures should be isolated from
use. Lawler Manufacturing Co., Inc. recommends
that you work safely at all times and in a manner
consistent with the OSHA Lock/Tagout standard,
29 CFR 1910.147 and other applicable standards.
temperedwater.com/patents
ENG. NO. 8334-A
ASSE 1071 Approved
ASSE Lead Free Certied
NOTICE! No mixing valve will work satisfactorily if improperly installed. We suggest, therefore, that you read
these instructions carefully before installing and follow directions as outlined. Handle the mixing valve with care.
Model 911®
Thermostatic Mixing Valve
Emergency Shower
This installation & maintenance manual covers all
congurations of the Model 911.
CAPACITIES – MODEL 911
Pressure Drop PSI 5 10 20 30 45
Tempered Flow GPM 25 35 50 60 72
Tempered Flow LPM 74 132 189 227 273
BYPASS CAPACITIES – MODEL 911
Pressure Drop PSI 5 10 20 30 45
Cold Bypass GPM 14 20 28 40 45
Cold Bypass LPM 53 75 106 151 170
8334_911_TH-TI_DRW_NODIMS.pdf
DIMENSIONS
Valve Number A N.P.T. B N.P.T. C D E
911 1-1/4” 1-1/4” 11” 9” 8”
Dimensions are for reference purposes only. For rough-in dimensions
please refer to Lawler’s Revit/BIM models found at temperedwater.com.
B
E
D
C
AA
Maximum Inlet Pressure: 125 PSI
Recommended Supply Pressure: 65 PSI
Recommended Inlet Temperature: 120°F
When supplying 140°F or greater, additional outlet
controls should be used.
Set Point: 85°F
Gallon per minute ratings may vary depending upon
incoming water temperatures and pressures. Hot and cold
water inlet pressures must be equal.
Valve must be installed with check valves. If shut off valves
are installed in the shower line for maintenance purposes,
provisions shall be made to prevent unauthorized shut off.

in ow 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.
Thermometers T1 and T2 should return to their set
temperatures and T3 to the proper outlet temperature.
4. Shut off the cold water supply to the mixing valve. The
ow of water should shut down rapidly.
5. Open the cold water supply. Thermometers T1 and T2
should return to their set temperatures and T3 to the
proper outlet temperature.
Operating Principle
The Model 911 Mixing Valve is made of two independent
thermostats housed in a single lead free brass casting.
The twin thermostatic cartridges respond independently
to incoming hot and cold water temperatures and provide
backup protection against element failure. If one element
fails, the other should continue to function properly. If
only one element is operating the valve will experience a
decrease in outlet temperature (T3). For this reason the
Model 911 Valve requires testing and maintenance on a
regular basis. In the event of element failure, the cartridge
will provide full cold water ow. The resulting temperature
difference between the two valves will be reected by T1
and T2.
Thermometers T1, T2, and T3 should be checked at least
every six months.
Installation
After installing the mixing valve, be sure to ush the system
thoroughly. Lawler recommends isolation and check valves
for proper maintenance.
Testing the Mixing Valve
The mixing valve and the emergency xtures it serves
should be tested weekly for proper operation.
Valve temperature test procedure is as follows:
1. Activate shower xtures to observe and record the
temperature of the thermometers T1, T2, and T3.
The valve is functioning properly if the T1 and T2
temperatures are equal and T3 is at the proper outlet
temperature. If the temperature of thermometers T1 and
T2 are not equal, readjust the mixing valve according to
the section “Setting the Mixing Valve.” Slight variations
between the valve set temperatures and the outlet
temperatures may occur.
2. Observe the ow from the emergency xtures to ensure
an adequate ow 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 ow from the emergency xtures
to ensure an adequate ow of cold water. A slight drop
30
40
50
60
70 80
90
110
120
130
30
40
50
60
70 80
90
110
120
130 30
40
50
60
70 80
90
110
120
130
1″
4N.P. T.
COLD
INLET
N.P. T.
HOT
INLET
1″
4A
B
C
1
1
N.P. T. TEMPERED
OUTLET
1
″
4
1
T2
T3
T1
5330 East 25th Street
Indianapolis, Indiana 46218
Valve 2
(V2)
Valve 1
(V1)
Replacing a Thermostat Cartridge
The thermostat replacement procedure is as follows:
1. Shut off the hot water supply and cold water supply to
the mixing valve.
2. Unscrew valve V1 or V2 (depending on which valve
is not operating properly) and install a new thermostat
cartridge assembly.
3. Open the hot water supply and the cold water supply
to the mixing valve. Check the temperature to see if
the replacement cartridge is operating correctly. If the
temperature requires adjustment refer to the section
“Setting the Mixing Valve.”
20
40
60
80 100120
14 0
16 0
18 0
200
0
Cartridge Kit
Part Number 8334-50
Thermometer
Part Number 6679-00

D
V2
V1
#3 CAP SCREWS
SAFETY LATCH #1 PADLOCK (optional)
#2 LOCKOUT PLATE
(optional)
Setting the Mixing Valve
Prior to adjusting the temperature on the emergency mixing
valve be aware that prior to shipping this valve was tested
and set at the factory. Please make sure that isolation
valves and check valves are installed and that incoming
hot and cold pressures are equal before any adjustment
is made. If these parameters are not present, DO NOT
proceed to “Setting the Mixing Valve” until these parameters
are met. IT IS ADVISED TO CALL THE FACTORY PRIOR
TO DOING ANY TEMPERATURE ADJUSTMENTS ON ANY
LAWLER EMERGENCY THERMOSTATIC MIXING VALVE.
This mixing valve has been set at the factory to deliver
85°F outlet ow. Should the valve require adjustment, or an
application require a different set temperature, proceed as
follows:
1. Contact the proper medical and safety authorities to
determine correct water temperature for the specic
application.
2. If the valve is outtted with a padlock #1 and lockout
plate #2, unlock and remove.
3. Use a spanner wrench to remove the tamper-resistant
cap screws #3.
4. Create a draw on the mixing valve by opening a
downstream shower xture.
5. Insert a 5/32” allen key into the cap opening of valve 1
(V1) and seat in the adjustment screw (not shown). Set
the outlet temperature by turning the adjustment screw
clockwise to reduce temperature, counterclockwise
to increase temperature. Use thermometer (T1) to
measure the outlet temperature.
6. Adjust valve 2 (V2) using the same procedure used to
adjust valve 1 (V1).
7. Examine thermometers T1 and T2. Valve 1 and valve
2 should be set to the same temperature and the outlet
temperature should be 85°F or as specied for your
application. Adjust if necessary.
8. Replace cap screws #3, lockout plate #2 and padlock
#1.

GUARANTEE
We guarantee the Lawler Mixing Valve to be free from defects in workmanship and material, and for
a period of one year from date of purchase, will replace any parts found by us to be defective. We will
not be held responsible, however, for any labor incidental to, or for any damages caused by defective
material. Each mixing valve is thoroughly inspected and tested under actual conditions at our factory.
STORAGE
TANK
WATER
HEATER
HEAT TRAP
27” DROP
CW
CW HW
CV
CV
TO LOW
TEMPERATURE
FIXTURES
Water heater must
be installed per
manufacturers O+M
CV
MODEL 911
STORAGE
TANK
WATER
HEATER
HEAT TRAP
27” DROP
RECIRCULATION
PUMP
CW
CW HW
CV
CV
CV
TO LOW
TEMPERATURE
FIXTURES
Water heater must
be installed per
manufacturers O+M
CV
MODEL 911
Typical Installation Figure 1
When installed at or near the water heater and without a
recirculation system:
Install the valve as shown in Figure 1 with the mixing valve
positioned below the hot water tank or heater. If this is not
possible, pipe in a heat trap as shown.
Typical Installation Figure 2
When installed away from the water heater with a
recirculating pump on the hot water supply line:
Install the mixing valve as shown in Figure 2. The non-
circulated loop should be limited to 10 feet and must be
ushed periodically.
Notes: If the valve is installed 20 feet or more from the water heater, it is
important to recirculate the hot water supply to the mixing valve.
The mixing valve must be installed with inlet check valves and the shower
or the Eyewash/Facewash xture should be installed 4 to 10 feet from the
mixing valve. Hot and cold water inlet pressures must be equal.
Provisions shall be made to thermally isolate the valve.
Figure 1
Valve must be installed with check valves
Figure 2
Valve must be installed with check valves
WARNING: This product contains chemicals known
to the State of California to cause cancer and birth
defects or other reproductive harm.
(Installer: California law requires that this warning
be given to the consumer.)
For more information: www.oehha.org/prop65
CAUTION: The cold water line must be installed so
that it is not affected by excessively hot ambient
temperatures. Provisions shall be made to thermally
isolate the valve. Cold water pipe installed in the
ceilings of boiler rooms or rooms that increase
ambient temperature require a recirculating pump.

Series 911 Test Record
Location _______________________
Date T1 T2 T3
July
Aug
Sept
Oct
Nov
Dec
Jan
Feb
March
April
May
June
July
Aug
Sept
Oct
Nov
Dec
Jan
Feb
March
April
May
June
July
Aug
Sept
Oct
Nov
Dec
Date T1 T2 T3
Jan
Feb
March
April
May
June
July
Aug
Sept
Oct
Nov
Dec
Jan
Feb
March
April
May
June
July
Aug
Sept
Oct
Nov
Dec
Jan
Feb
March
April
May
June
YEAR YEAR YEAR
YEAR YEAR YEAR
Before you use this chart please make a copy for future testing records.
CAUTION: When maintaining and adjusting the mixing valve. The delivered ushing uid temperature shall
be 60°F (15°C) to 95°F (35°C). In circumstances where chemical reaction is accelerated by ushing uid
temperature, a medical advisor should be consulted for the optimum temperature for each application.