HALE MST User manual

09/15/96
MST
MANUAL SINGLE
TANK FLUSH SELECTOR
INSTALLATION MANUAL
Hale Products cannot assume responsibility for product failure resulting from improper maintenance
or operation. Hale Products is responsible only to the limits stated in the product warranty. Product
specifications contained in this material are subject to change without notice.
HALE PRODUCTS, INC. lA Unit of IDEX Corporation l700 Spring Mill Avenue lConshohocken, PA 19428 lTEL: 610-825-6300 lFAX: 610-825-6440
All Hale products are quality components: ruggedly designed, accurately machined, precision inspected, carefully assembled
and thoroughly tested. In order to maintain the high quality of your unit, and to keep it in a ready condition, it is important to
follow the instructions on care and operation. Proper use and good preventive maintenance will lengthen the life of your unit.
ALWAYS INCLUDE THE UNIT SERIAL NUMBER IN CORRESPONDENCE.
MANUAL P/N 029-0020-48-0, REV A, © 1996 HALE PRODUCTS, INC., PRINTED IN U.S.A.

i
Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
TABLE OF CONTENTS
Section Page
1 SAFETY ...................................................................................................................1
2 EQUIPMENT DESCRIPTION...................................................................................2
3 WHAT YOU GET......................................................................................................3
4 HALE MST FLUSH SELECTOR INSTALLATION....................................................4
5 OPERATION ..........................................................................................................15
6 PARTS LIST...........................................................................................................17
7 WARRANTY...........................................................................................................19
NOTE TO SYSTEM INSTALLER
IMPORTANT: Please provide two copies of the Hale FoamMaster MST manual to the end user of
the equipment. For additional manuals, contact Hale Products, Inc. at (610) 825-6300.
Ask for Manual P/N 029-0020-48-0.

1
Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
SAFETY Before attempting to install a Hale FoamMaster MST, read all
of the following safety precautions and follow carefully.
1. WARNING: Do not supply flushing
water at pressures higher than the
maximum recommended pressure.
[500 PSI (34 BAR)]
2. WARNING: Always disconnect the
power source before attempting to
service any part of the system.
3. WARNING: Release all pressure
within the system before servicing
any of its components.
4. WARNING: Drain all concentrate and
water from the system before
servicing any of its component parts.
5. WARNING: Check all hoses for weak
or worn conditions after each use.
Ensure that all connections and
fittings are tight and secure.
6. WARNING: Use only pipe, hose, and
fittings from the foam pump outlet to
the injector fitting, which are rated at
or above the maximum pressure [500
PSI (34 BAR) minimum] rating at
which the water pump system
operates.
7. WARNING: Any electrical system has
the potential to cause sparks during
service. Take care to eliminate
explosive or hazardous environments
during service/repair.
8. CAUTION: Periodically inspect the
pump and the system components.
9. CAUTION: Read and understand
these installation instructions before
proceeding with the equipment
installation.
10.CAUTION: The foam tank low level
sensor must be utilized to protect the
foam pump from dry running. Failure
to do so will void warranty.
11.CAUTION: The Hale FoamMaster MST
flush selector is not recommended for
use on top mount pump panels due
to gravity feed from foam tank to
foam pump requirement.
12.CAUTION: When selecting fittings
make sure they are compatible with
all foam concentrates that will be
used. Some stainless steel fittings are
not compatible with some Class B
foam concentrates.
13.CAUTION: DO NOT connect the
drain from the Hale FoamMaster MST
to the apparatus multi drain system
or do not tee onto single drain.
Individual drain valves are
recommended for foam system
drains. If a multiple drain must be
used Hale recommends the use of a
Hale DV7 multiple drain valve (Hale
P/N 529-5420-00-0) or equivalent that
isolates each drain port.
14.CAUTION: The Hale FoamMaster MST
flush selector handle must be in the
FOAM TANK position. If the Hale
FoamMaster MST flush selector
handle is in the FLUSH position when
the Hale FoamMaster foam pump is
started the foam pump will only run
for 20 seconds and shut down.
15.CAUTION: When shutting down the
apparatus leave the Hale
FoamMaster MST flush selector
handle in the FOAM TANK position.

2Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
EQUIPMENT DESCRIPTION
The valve has a FLUSH and FOAM TANK
position.
A switch mounted on the Hale
FoamMaster MST flush selector interlocks
with the Hale Foammaster system to
indicate when the selector is in the flush
position.
CAUTION: The Hale FoamMaster MST
is not recommended for use on top
mount pump panels due to gravity
feed from foam tank to foam pump
requirements.
NOTE: This manual details installation
and use of the Hale FoamMaster MST
flush selector only. Refer to the Hale
FoamMaster foam system manual for
information on complete foam
system installation instructions.
The Hale FoamMaster MST flush selector
is a simple and reliable valve that adds
NFPA compliant flush capabilities to the
Hale FoamMaster line of automatic
rotary gear pump foam proportioners.
The Hale FoamMaster MST flush selector
is a panel mounted valve that provides
a mechanical means of flushing the
Hale FoamMaster system. The major
component of the Hale FoamMaster
MST is a ball type selector valve. The
valve has 3 ports and is operated
manually. There is one ¾ inch NPT foam
concentrate inlet with swing check
valve attached and one ¾ inch NPT
foam concentrate outlet. The
remaining port is reduced to ¼ inch NPT
for the flushing water connection. The
flushing water connection is fitted with a
¼ inch NPT swing check valve to
prevent contamination of the water
supply with foam concentrate.

3
Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
WHAT YOU GET
MST Flush Selector Assembly with Check Valves and Switch Attached
(Hale P/N 538-1490-02-0)
Optional Wiring Harness Extension
72 inches (1829 mm) long
(Hale P/N 513-0320-07-0)
Hale MST Wiring Harness
(Hale P/N 513-0320-04-0)

4Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
Hale MST Flush Selector Installation
INSTALLATION NOTES:
Before installing the Hale FoamMaster MST thoroughly read the installation
instructions contained in this manual. The following notes provide background
information to aid in the installation. Refer to Figures 1 and 2 to identify component
parts and connections. Figure 3 shows a typical plumbing arrangement.
1. Threads for the foam concentrate
inlet and outlet connections are ¾ inch
NPT.
2. Fittings and hoses used with the Hale
FoamMaster MST must be compatible
with all foam concentrates that are to
be used in the system. The fittings must
be made of brass, 300 series stainless
steel or nylon.
CAUTION: When selecting fittings
make sure they are compatible with
all foam concentrates that will be
used. Some stainless steel fittings are
not compatible with some Class B
foam concentrates.
3. To meet NFPA requirements and to
monitor foam concentrate priming,
clear hoses must be used from the foam
tank to the foam inlet swing check
valves on the Hale FoamMaster MST. For
Class A and low viscosity Class B foam
concentrates use minimum ¾ inch inside
diameter hose. High viscosity Class B
foam concentrates require minimum 1
inch inside diameter hose. The hoses
must be capable of withstanding 23
inches (584 mm) Hg vac/50 PSI (3 BAR)
working pressure (Kuriyama, Kuri-tec K-
7130 series or equal).
4. Hose from the Hale FoamMaster MST
outlet port must have minimum ¾ inch
Figure 1. Hale FoamMaster MST Flush Selector Valve Assembly (Front View)
FLUSH WATER
CONNECTION
SELECTOR
HANDLE
SELECTOR HANDLE
SWING RADIUS
[4-¾ INCHES (121 mm)
MINIMUM]
FOAM CONCENTRATE
INLET CHECK VALVE
NAMEPLATE
SCREWS (FOUR
REQUIRED)
MST SWITCH
CONNECTION
HARNESS

5
Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
inside diameter and be capable of
withstanding 23 inches (584 mm) Hg vac
and the maximum discharge pressure of
the fire pump [500 PSI (34 BAR)
minimum] due to system flush
requirements.
5. Flush water must be provided from
the fire pump to the Hale FoamMaster
MST. Hose for the flush connection
should be minimum ½ inch outside
diameter and capable of withstanding
the maximum discharge pressure of the
fire pump. The swing check valve at the
flushing water connection on the Hale
FoamMaster MST has ¼ inch NPT
threads.
NOTE: A shutoff valve is
recommended for this line to enable
isolation of the Hale Foammaster MST
for service.
6. Plan installation and determine
location of the Hale FoamMaster MST on
the operator panel. The following must
be kept in mind when locating the Hale
FoamMaster MST flush selector valve:
a.) Foam concentrate must gravity
feed from the foam tanks to the Hale
FoamMaster MST.
CAUTION: The Hale FoamMaster MST
is not recommended for use on top
mount pump panels due to gravity
feed from foam tanks to foam pump
requirements.
b.) Foam concentrate must gravity
feed from the Hale FoamMaster MST
to the Hale FoamMaster rotary gear
pump or FS Series strainer.
Figure 2. Clearance Required Behind Operator Panel for Hale FoamMaster MST
LOOKING UP FROM BOTTOM OF OPERATOR PANEL
OPERATOR
PANEL
6-½ INCHES
(165 mm)
FOAM TANK
INLET
CONNECTION
FLUSH WATER
CONNECTION
FOAM OUTLET
CONNECTION
7-¼ INCHES
(184 mm)

6Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
c.) A minimum of 6-½ inches (165
mm) plus allowance for the hoses
and fittings behind the operator
panel is required for Hale
FoamMaster MST installation.
d.) The selector handle requires a
swing radius of 4-¾ inches (121 mm)
on the panel for unrestricted
operation.
Figure 3. Hale FoamMaster MST Typical Plumbing Installation
FROM FOAM
TANK
FLUSH HOSE CONNECTION
(3/8INCH OUTSIDE DIAMETER
MINIMUM)
STANDARD IN-LINE
FOAM STRAINER
¾ INCH (19 mm) MINIMUM
INSIDE DIAMETER HOSE
¾ INCH (19 mm) MINIMUM
INSIDE DIAMETER HOSE
FOR CLASS A FOAM
1 INCH (25 mm) MINIMUM
INSIDE DIAMETER HOSE
FOR CLASS B FOAM
TO FOAM PUMP SUCTION
CONNECTION HOSES AND FITTINGS CAPABLE OF WITHSTANDING 500
PSIG (34 BAR) and 23 INCHES (584 mm) Hg VACUUM
HOSES AND FITTINGS CAPABLE OF WITHSTANDING
50 PSIG (3 BAR) and 23 INCHES (584 mm) Hg VACUUM
¾ INCH (19 mm) MINIMUM
INSIDE DIAMETER HOSE
FOR CLASS A FOAM
1 INCH (25 mm) MINIMUM
INSIDE DIAMETER HOSE
FOR CLASS B FOAM

7
Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
VALVE INSTALLATION:
The following procedures shall be
followed when installing the Hale
FoamMaster MST flush selector in the
Hale FoamMaster system:
NOTE: The Hale FoamMaster MST is
shipped assembled. Some
disassembly is required to mount the
Hale FoamMaster MST. Note the
position of components as they are
removed to allow for reassembly.
1. Unscrew and remove the selector
handle from the Hale FoamMaster MST
flush selector valve handle mount
assembly. (See figure 1)
2. Remove the four ¼-20 UNC x 5/8inch
long screws holding the foam selector
nameplate to the selector valve
assembly and remove the nameplate.
3. Using the nameplate as a template
mark the location of mounting holes on
the operator panel. Make sure there is
sufficient clearance behind the operator
panel where the Hale FoamMaster MST
is to be mounted (Refer to figure 2).
Verify mounting hole location and size
using figure 4.
4. Cut one 2-¾ inch (70 mm) diameter
hole and drill four 9/32 inch (7 mm)
diameter holes as marked on the
operator panel.
5. Position the selector valve on the
back of the operator panel by placing
the selector handle mount assembly
through the 2-¾ inch (70 mm) diameter
hole. Make sure the foam outlet
connection is orientated towards the
bottom of the selector valve.
6. Position the nameplate on the panel
front and align the screw holes with
those on the panel and selector valve.
Install the four ¼-20 UNC x 5/8inch long
screws that were removed in step 2.
Figure 4. Hale FoamMaster MST Flush Selector Valve Mounting Template
1-5/8INCHES
(41 MM)
(4) 9/32 IN. (7 MM)
DIAMETER HOLES
3-¼ INCHES
(83 MM)
2 INCHES
(51 MM)
1 INCH
(25 MM)
2-¾ INCHES
(70 MM)
DIAMETER
OUTLINE OF PANEL PLACARD FOR
REFERENCE ONLY

8Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
minimum], connect flush water line from
one of the pressure taps on the fire
pump to the ¼ inch NPT inlet of the
flushing water swing check valve.
10.Using 3/8inch (10 mm) minimum
outside diameter tubing capable of
withstanding the maximum fire pump
discharge pressure [500 PSI (34 BAR)
minimum], connect a drain hose from
the flushing water hose to a suitable
drain valve.
CAUTION: DO NOT connect the
drain from the Hale FoamMaster MST
to the apparatus multi drain system
or do not tee on single drain due to
crosstalk. Individual drain valves are
recommended for foam system
drains. If a multiple drain must be
used Hale recommends the use of a
Hale DV7 multiple drain valve (Hale
P/N 529-5420-00-0) or equivalent that
isolates each drain port.
11.Install ¾ inch (19 mm) minimum inside
diameter hose from the Hale
FoamMaster MST flush selector to the
inlet of the Hale FoamMaster rotary gear
pump or FS Series Strainer. The hose and
7. Apply Loctite 242 or equal thread
locking compound on the setscrew
threads and reinstall the selector handle
on the selector valve handle mount
assembly.
NOTE: Some high viscosity Class B
foam concentrates require 1 inch (25
mm) inside diameter hose for proper
system operation. Class A, Class B
AFFF, and low viscosity Class B AFFF/
AR foam concentrates can use ¾
inch (19 mm) inside diameter hose.
8. Install brass, 300 series stainless steel
or nylon hose barb fitting for the hose
from the foam concentrate tank to the
inlet of the check valve. (See figure 5)
The check valve inlet has ¾ inch female
NPT threads. Use clear hose with ¾ or 1
inch (19 or 25 mm) minimum inside
diameter that is capable of withstanding
23 inches (584 mm) Hg vac/50 PSI (3
BAR) working pressure (Kuriyama, Kuri-
Tec K-7130 series or equal).
9. Using 3/8inch (10 mm) minimum
outside diameter tubing capable of
withstanding the maximum fire pump
discharge pressure [500 PSI (34 BAR)
FOAM
CONCENTRATE
INLET
¾ INCH NPT FOAM CONCENTRATE
OUTLET ¾ INCH NPT
FLUSHING
WATER INLET
¼ INCH NPT
Figure 5. Hale FoamMaster MST Flush Selector Valve (Back View)

9
Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
fittings from the foam outlet on the MST
must be capable of withstanding 23
inches (584 mm) Hg vacuum, maximum
fire pump discharge pressure [500 PSI (34
BAR) minimum], and be compatible with
the foam concentrates to be used
(Aeroquip 2580 series or equivalent
reinforced hydraulic hose). Use brass or
300 series stainless steel fittings (reusable
or crimp type Aeroquip 412 series or
equal fittings) for the hose from the foam
concentrate outlet on the Hale
FoamMaster MST.
FOAM TANK LOW LEVEL SENSOR
INSTALLATION:
After the Hale FoamMaster MST flush
selector is installed and hoses are
connected, the low tank level sensor
must be installed and wired to monitor
foam concentrate level. A low tank
level sensor is included with the Hale
FoamMaster foam proportioner system
when the Hale FoamMaster MST option
is ordered. Mount the low tank level
sensor in the foam tank as follows. Refer
to figure 6 for low tank level sensor
mounting options.
CAUTION: A foam tank low level
sensor must be utilized to protect the
Hale FoamMaster from dry running.
Failure to use a low level sensor with
the Hale FoamMaster system will void
warranty.
SIDE MOUNT LOW LEVEL SENSOR
INSTALLATION
1. A side mount low tank level sensor is
available to be used if the bottom of the
foam tank is not accessible. The side
mount low tank level sensor has ½ inch
NPT threads and is mounted on the
foam tank using a bulkhead fitting with
½ inch FNPT threads (see figure 7). The
center of the switch must be located
approximately 1-½ to 2 inches (38 to 51
mm) from the bottom of the foam tank
with the float positioned on top of the
switch to move up and down.
NOTE: When the side mount low
tank level sensor senses a low
concentrate condition the system will
operate for one minute unless the
foam concentrate level is restored. If
the foam concentrate level is not
restored the Hale FoamMaster system
will shut down. When locating the
side mount low tank level sensor on
the foam tank sufficient foam
concentrate should be present for
one minute of operation at rated
flow.
2. Coat the threads of the low tank
sensor with suitable sealant and insert
into bulkhead fitting. Tighten sensor
making sure the float is on the top of the
sensor.
Figure 6. Foam Tank Low Level Sensor
Mounting Options
BOTTOM MOUNT
LOW LEVEL
SENSOR OPTION
SIDE MOUNT
LOW LEVEL
SENSOR
OPTION
TOP MOUNT LOW
LEVEL SENSOR
OPTION
TYPICAL
FOAM TANK

10 Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
3. After installation, check operation of
the side mount low tank level sensor with
a powered test light. With no foam in
the tank, the light should be on. If light
does not illuminate, rotate the side
mount low tank level sensor until the test
light is on.
BOTTOM MOUNT LOW LEVEL SENSOR
INSTALLATION
1. The bottom mount foam tank low
level sensor must be mounted into the
bottom of the foam tank. The sensor, as
supplied, is threaded into a bushing that
has 1 inch NPT threads. The sensor is
designed to be installed from the
outside of the foam tank through a
bulkhead fitting or boss with 1 inch FNPT
threads. Mount the sensor in the bottom
of the foam tank in an upright position.
Use suitable sealant to prevent
concentrate leakage.
NOTE: There must be sufficient
space under the foam tank for the
low tank level sensor wires to be
routed to the foam pump/motor
assembly. Be sure not to remove the
float from the shaft on the low tank
level sensor assembly. If the float is
installed in the reverse position, “
lo
A
” will appear on the control unit
and the system will automatically
shut down even if there is foam in the
tank.
2. Check low tank level sensor
operation with a powered test light.
With no foam in the tank, the light
should be on. If this is not the case,
remove the clip from the end of the
sensor. Remove float and reinstall 180o
out of position. Reinstall clip.
TOP MOUNT LOW LEVEL SENSOR
INSTALLATION
A top mount low level sensor assembly is
available for installations where the sides
or bottom of the foam tank are not
accessible or sensor service is required
without draining the foam tank. The
sensor assembly is flange mounted in an
access hole at the top of the foam tank.
The two section telescoping assembly
permits adjustment of low tank level
sensor position for various foam tank
depths from 31-½ to 60 inches (800 to
1524 mm). Flange cutout dimensions
shown in figure 8.
a. Using dimensions in figure 8, layout
and drill holes in the top of the foam
tank. The center of the sensor should
be located at least 1-½ to 2 inches
(38 to 51 mm) from the sides of the
foam tank.
NOTE: The minimum depth of foam
tank for installation of the top mount
sensor without cutting the tube
sections is 31-½ inches (800 mm). If
the tank depth is less than 31-½
inches (800 mm) cut the tubing as
described in step c.
Figure 7. Side Mount Foam Tank Low Level
Sensor Installation
1-½ to 2 in.
(38 to 51 mm)
BULKHEAD
FITTING
LOW TANK
LEVEL SENSOR
ASSEMBLY
BOTTOM OF FOAM TANK
FLOAT POSITION
(INSUFFICIENT FOAM
CONCENTRATE IN TANK)
FLOAT POSITION
(SUFFICIENT FOAM
CONCENTRATE IN TANK)

11
Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
Figure 8. Top Mount Low Tank Switch
Mounting Flange Template
1.44 in.
(37 mm)
0.72 in.
(18 mm)
1.31 in.
(33 mm)
Dia. Thru
Hole
0.72 in.
(18 mm)
1.44 in.
(37 mm)
b. Determine the approximate
length of the top mount low tank
sensor extension by measuring from
the top of the foam tank at the
flange opening to the bottom of the
tank. When properly installed the
center of the sensor float should be 1-
½ to 2 inches (38 to 51 mm) above
the bottom of the foam tank.
c. Slide the flange to the top of the
5/8 inch diameter tube and adjust
the telescoping section until the
desired length is achieved as
measured from the bottom of the
flange to the bottom of the sensor.
Tighten the compression fittings on
the union to lock length.
NOTE: If telescoping section will not
get short enough it can be
disassembled and cut. Take care to
deburr the ends of the tubes after
they are cut. Cut an equal amount
from each section of tubing.
(4) Thru Holes with #7 drill
Tap ¼-20 or provide threaded
inserts
IMPORTANT: Use the following
procedure only if the tube sections
are too long otherwise proceed to
step d.
Refer to figure 9, disassemble and cut
the tube sections as follows:
1) Loosen and remove the 3/8
FNPT x 5/8tube fitting and strain relief
from the top of the sensor assembly.
Carefully slide the sensor wire out of
Figure 9. Top Mount Low Tank Switch
Assembly Component Identification
STRAIN
RELIEF
STRAIN RELIEF
GLAND NUT FLANGE AND
GASKET
SENSOR
¼ NPT X 1/8FNPT
BUSHING
¼ FNPT X ½ TUBE
FITTING
½ TUBE X 5/8
TUBE UNION
3/8FNPT X 5/8TUBE
FITTING
5/8INCH O.D.
STAINLESS TUBE
½ INCH O.D.
STAINLESS TUBE
SENSOR
WIRE
MINIMUM LENGTH
WITHOUT CUTTING TUBE
SECTIONS 31-½ INCHES
(800 MM)

12 Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
the strain relief gland.
2) Loosen and remove the ¼ FNPT
x ½ tube fitting and sensor from the
bottom of the sensor assembly. DO
NOT remove the ½ inch tube from
the 5/8inch tube.
3) Using a tubing cutter remove
the required length of tube from the
end of each tube. Deburr the cuts
when complete.
4) Install a new ½ compression
ferrule on the end of the tube.
Carefully thread the sensor wire
through the tube assembly and
attach the ¼ FNPT x ½ tube fitting
with sensor attached to the end of
the tube. Tighten the ½ tube
compression nut.
5) Install a new 5/8compression
ferrule on the end of the tube.
Carefully thread the sensor wire
through the 3/8FNPT x 5/8tube fitting
and strain relief gland. Attach the 3/8
FNPT x 5/8tube fitting and strain relief
to the end of the tube. Tighten the 5/
8tube compression nut.
6) Slide the flange to the top of
the 5/8 inch diameter tube and
adjust the telescoping section until
the desired length is achieved as
measured from the bottom of the
flange to the bottom of the sensor.
Tighten the compression fittings on
the union to lock length.
CAUTION: Use mounting hardware
that is compatible with all foam
concentrates to be used in the
system. Use washers, lockwashers
and capscrews made of brass or 300
series stainless steel.
d. Insert sensor assembly through the
1.31 inch (33 mm) hole and align the
screw holes on the flange and gasket
with the holes on the tank. Secure
the assembly in place using four ¼-20
UNCx1inchlongcapscrews,¼inch
washers and ¼ inch lockwashers.
e. Make final adjustment to the
sensor position by pulling the tubing
sections up through the flange until
sensor is 1-½ to 2 inches (38 to 51
mm) from the bottom of the tank.
Tighten the 5/8 tube compression nut
on the flange.
f. Close strain relief to the 900
position making sure it snaps shut.
Tighten strain relief gland nut to seal
out water and contamination.

13
Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
ELECTRICAL INSTALLATION
Refer to figure 10 for an electrical
diagram and proceed with the following
steps:
1. If the Hale FoamMaster MST is being
installed as a retrofit, remove the plug
from the Hale FoamMaster foam pump
distribution box.
CAUTION: Use the silicone sealer
provided with the Hale FoamMaster
system to insulate the terminal strip
connection screws and prevent
corrosion.
2. Use minimum 16 AWGType SXLor
GXL (SAE J1128) wire to connect the low
tank level sensor to the terminal block
on the distribution box. The low tank
level sensor is not polarity sensitive
therefore terminal connections are not
specific. When making splices to extend
the low tank sensor wires make sure the
splices are sealed using an adhesive
filled heat shrink tubing. Where two
wires exit the heat shrink tubing pinch
the tubing while heating the tubing to
make sure the adhesive seals around
both wires. Insulate and seal the
terminal strip connections using the
silicone sealer provided.
3. Connect the two wire Packard
WeatherPack connector on the Hale
FoamMaster MST to the MST wiring
harness. Route the MST wiring harness to
the Hale FoamMaster location. Secure
cable extension to apparatus. Connect
the 4-pin male cable connector from
the MST wiring harness to the
connection point labeled ACCESSORY
on the distribution box.
If the MST wiring harness will not reach
the Hale FoamMaster distribution box an
extension harness is available to extend
this cable.
To more accurately monitor foam
concentrate level, separate foam
concentrate tank level gauges, that
show the actual level of foam
concentrate in the foam tank, can also
be installed.

14 Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
FOAM TANK LOW
LEVEL SENSOR
SWITCH
HALE FOAMMASTER MST
OPTIONAL WIRING
HARNESS EXTENSION 2-WIRE PACKARD
WEATHERPACK
CONNECTOR HALE FOAMMASTER
MST FLUSH
SELECTOR ASSEMBLY
HALE FOAMMASTER
MST SWITCH WIRING
HARNESS
4 PIN MALE CABLE
CONNECTOR
Figure 10. Hale FoamMaster MST Flush Selector Valve Wiring Diagram

15
Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
OPERATION
SELECTOR SHOWN
IN FLUSH POSITION
SELECTOR SHOWN IN
FOAM TANK POSITION
VALVE
POSITION
INDICATOR
SELECTOR
HANDLE
Figure 11. Hale FoamMaster MST Flush Selector Valve Operation
FLUSHING HALE FOAMMASTER
When returning the apparatus to ready
condition after foam operations using
class B foam, the Hale FoamMaster
foam pump must be flushed because
some Class B foam concentrates
deteriorate rapidly.
NOTE: Approved class A foam
concentrates do not deteriorate
rapidly like class B foam
concentrates. As long as an
approved class A foam concentrate
is used and the system will be used
within 10-12 weeks no flushing will be
required. When class B foam
concentrate is used flush system then
switch back to FOAM TANK position.
The following procedures shall be used
to flush the foam pump. Refer to figure
11 for MST operation:
1. Energize apparatus and establish
water flow through a foam capable
discharge. Set fire pump for a low
discharge pressure, 50 to 75 PSI (3.4
to 5.2 BAR).
2. Energize Hale FoamMaster by
depressing the red ON button
allowing foam solution to discharge.
NOTE: When the Hale MST is in the
FLUSH position the Hale FoamMaster
foam injection system will only run for
20 seconds.
3. Place the Hale MST to the FLUSH
position.

16 Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
4. Observe discharge hose and allow
Hale FoamMaster and discharge to
run for several seconds.
NOTE: When the Hale MST is used in
systems for Class B foam
concentrates DO NOT allow the
foam pump to run in the FOAM TANK
position after flushing foam pump.
5. Place the Hale MST to the FOAM
TANK position and allow Hale
FoamMaster to run until Class A foam
solution is discharged through the
foam capable hose line. If Class B
foam concentrate is used shut down
Hale FoamMaster immediately after
switching to FOAM TANK position.
6. Shut down Hale FoamMaster allowing
foam capable discharge to run to
flush out the fire pump discharge
manifold as required. Once clear
water flows, close foam capable
discharge and shut down apparatus.
7. Perform required maintenance
checks on the Hale FoamMaster and
apparatus to return the apparatus to
ready condition.
IMPORTANT: Make sure the Hale MST
is in the FOAM TANK position when
apparatus is placed in ready
condition.

17
Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
PARTS LIST
11
2
9
3
7
15
10
8
5
6
19
12
13
14
1
4
21
17
16
20
18

18 Installation Manual
MST
MANUAL SINGLE TANK FLUSH SELECTOR
Item Part Number Qty Name of Part
1 007-3400-00-0 1 MST MOUNTING ADAPTER
2 008-0720-00-0 1 HANDLE MOUNT CAP
3 012-1330-00-0 1 TAPERED HANDLE
4 018-0402-78-0 2 SCREW #4-40 UNF X ¼ INCH LONG
5 018-1006-80-0 2 SCREW #10-24 UNC X ¾ INCH LONG
6 018-1205-44-0 4 SCREW ¼-20 UNC X 5/8INCH LONG
7 018-1706-57-0 1 SET SCREW 3/8-24 UNF X ¾ INCH LONG STAINLESS
8 038-1450-01-0 1 3-WAY VALVE
9 038-1620-00-0 1 BRASS SWING CHECK VALVE ¾ INCH NPT
10 038-1620-01-0 1 BRASS SWING CHECK VALVE ¼ INCH NPT
11 082-0210-02-0 1 BRASS CLOSE NIPPLE ¼ INCH NPT
12 082-0257-02-0 1 BRASS SERVICE ELBOW ¼ INCH NPT
13 082-0501-02-0 2 BRASS CLOSE NIPPLE ¾ INCH NPT
14 082-0513-02-0 1 BRASS BUSHING ¾ INCH NPT X ¼ INCH NPT
15 082-0516-02-0 1 BRASS 90 DEGREE ELBOW ¾ INCH NPT
16 101-1340-25-0 1 MST PLACARD
17 110-7560-00-0 1 COUPLING NUT 7/16-20 UNF STAINLESS
18 512-0460-00-0 1 HANDLE MOUNT ASSEMBLY
012-1330-02-0 1 HANDLE MOUNT
029-0470-00-0 1 SWITCH ACTUATOR MAGNET
19 513-0320-03-0 1 MST SWITCH WIRING HARNESS
20 513-0320-04-0 1 MST WIRING HARNESS
21 513-0320-07-0 1 OPTIONAL WIRE HARNESS EXTENSION
72 INCHES (1829 MM) LONG
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