Leonard TM-2020B-2P Guide

Bulletin G10N2
February 2007
1360 Elmwood Avenue, Cranston, RI 02910 USA
Phone: [phone] Fax: [phone]
Email: [email protected]
Web Site: http://www.leonardvalve.com
INSTALLATION ADJUSTMENT SERVICE
TM-1520A-2P, TM-2020B-2P PARALLEL
SYSTEMS
Note: Each individual valve assembly is ASSE 1017 listed.
IMPORTANT! Provide serial numbers for both valves when ordering parts!!
INSTALLATION
4. Flush pipes thoroughly after system has been
connected.
5. Assemblies installed on a recirculated hot water system
MUST be piped according to LEONARD’S
REQUIRED PIPING METHOD #5 (see page 4).
6. Refer to page 3 of this bulletin for correct Setup
Instructions.
1. Type TM Parallel Systems are factory pre-assembled and
tested and include large and small thermostatic water
mixing valves which function as a system to meet both
high and low demand for tempered water.
2. System should be installed at a location where it can
easily be cleaned, adjusted or repaired.
3. System supplies must be connected as shown (Hot-left,
Cold-right). Exercise caution when soldering.
Maximum Operating Pressure 125PSI (860 KPA) for Hot and Cold Water.
CAUTION
All thermostatic water-mixing valves have limitations. They will not provide the desired
accuracy outside of their flow capacity range. Consult the capacity chart on page 12. Minimum
flow must be no less than as shown.
LEONARD VALVE CO.
CRANSTON RI USA
US.Patents2.970,3,061,1953.152,760
TYPTM
20
40
°F
0
140
30 100 20
60
LEONARD
-10
°C
0
10
50
120
40R
60 80
LEONARDVALVECO.
CRANSTON RI USA
US.Patents2.970,3,061,1953.152,760
TYPTM
28"
39"
HOT COLD
TM-1520A-2PTM-2020B-2P
331
2
"
40
20
100
30
20
0°F
140
LEONARD
60°C
0
-10
10
120
R
40
50
60 80
C
3"
L
LEONARD
THERMOSTATIC
C
H
ASSE
1017
LEONARD
THERMOSTATIC
C
H
ASSE
1017
46"
HOT COLD

TM-2020B-2P ADJUSTMENT AND SERVICE ONLY
NOTE: Parallel Systems include Thermostatic
Water Mixing Valves, which must be regularly
maintained to provide best performance.
Frequency of cleaning depends on quality of local
water conditions and usage. See Maintenance
Guide and Record MGR-1001
Leonard Type TM Thermostatic Water Mixing
Valves are simple in design and may be easily
cleaned, adjusted and repaired. If the installation
is accessible, servicing may be completed without
disconnecting the valves.
WARNING
These mixing valves are equipped with an adjustable high temperature limit stop factory set at approximately
120°F (49°C) with an incoming hot water supply temperature of 150°F (65.5°C). If the hot water supply
temperature of the job is greater than 150°F (65.5°C), the valves when turned to full HOT will deliver water in
excess of 120°F (49°C) and the limit stopMUST BE RESET BY THE INSTALLER!
TO RESET ADJUSTABLE HIGH TEMPERATURE LIMIT STOP:
TM-2020B SMALL MIXING VALVESTM-2020B LARGE MIXING VALVES
1. Loosen LTR screw
2. Remove SNAP CAP, SCREW & WASHER, Remove
POINTER.
3. Temporarily place POINTER on the spline rod, turn
RIGHT for warmer temperature, turn LEFT for cooler
temperature. When valve is delivering warmest temperature
desired,removethe pointer.
4. Replace POINTER on the spline rod so that its RIGHT
edge is resting against the STOP SCREW located on the
RIGHT SIDE OF THE COVER.
5. The new maximum temperature has now been set. Test this
temperature by holding a thermometer under the flow of
water to be certain it is as desired.
POINTER SETSCREW
SNAP
CAP
LTR
C
H
THERMOSTATIC
LEONARD
STOP
SCREW
IMPORTANT! ALL MIXING VALVES MUST BE SET AT THE SAME
OPERATING TEMPERATURE.
SEE PAGES: 6 & 7 FOR COMPLETE PARTS BREAKDOWN
Check for significant variations in outlet flow. Thermostatic valves will NOT provide the desired accuracy
outside of their flow capacity range. Minimum flows must be no less than shown (see Flow Capacities, page 12).
If installed on a recirculated hot water system, make certain the valve is piped according to Leonard’s Required
Piping Methods (see page 4).
REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE CLEANED AND MAINTAINED
ON A REGULAR BASIS. (SEE MAINTENANCE GUIDE AND RECORD, MGR-1001).
2
RETAINING RING
SCREW
ADJUSTMENT
FINE
H
L
WEB
D
T
O
C
STOP
LTR SET SCREW
1. Remove SNAP CAP, SCREW & WASHER &
POINTER.
2. Loosen LTR screw, and remove retaining ring and stop.
3. Temporarily place POINTER on the spline rod, adjust to
desired temperature, and remove the pointer.
4. Push stop on rod so that its RIGHT edge is resting against
the fine adjustment screw on cover.
5. Turn fine adjustment screw if necessary, (clockwise for
slightly higher temperature, counter clockwise for slightly
lowertemperature).
6. The new maximum temperature has now been set. Test
this temperature by holding a thermometer under the flow
of water to be certain it is as desired.

TM-1520A-2P ADJUSTMENT AND SERVICE ONLY
NOTE: Parallel Systems include Thermostatic
Water Mixing Valves, which must be regularly
maintained to provide best performance.
Frequency of cleaning depends on quality of local
water conditions and usage. See Maintenance
Guide and Record MGR-1001
Leonard Type TM Thermostatic Water Mixing
Valves are simple in design and may be easily
cleaned, adjusted and repaired. If the installation
is accessible, servicing may be completed without
disconnecting the valves.
WARNING
These mixing valves are equipped with an adjustable high temperature limit stop factory set at approximately
120°F (49°C) with an incoming hot water supply temperature of 150°F (65.5°C). If the hot water supply
temperature of the job is greater than 150°F (65.5°C), the valves when turned to full HOT will deliver water in
excess of 120°F (49°C) and the limit stopMUST BE RESET BY THE INSTALLER!
TO RESET ADJUSTABLE HIGH TEMPERATURE LIMIT STOP:
TM-1520A SMALL MIXING VALVETM-1520A LARGE MIXING VALVE
1. Loosen LTR screw
2. Remove SNAP CAP, SCREW & WASHER, Remove
POINTER.
3. Temporarily place POINTER on the spline rod, turn RIGHT
for warmer temperature, turn LEFT for cooler temperature.
When valve is delivering warmest temperature desired, remove
thepointer.
4. Replace POINTER on the spline rod so that its RIGHT edge is
resting against the STOP SCREW located on the RIGHT SIDE
OF THE COVER.
5. The new maximum temperature has now been set. Test this
temperature by holding a thermometer under the flow of water
to be certain it is as desired.
POINTER SET SCREW
SNAP
CAP
LTR
C
H
THERMOSTATIC
LEONARD
STOP
SCREW
IMPORTANT! ALL MIXING VALVES MUST BE SET AT THE SAME
OPERATING TEMPERATURE.
SEE PAGES: 9 & 11 FOR COMPLETE PARTS BREAKDOWN
Check for significant variations in outlet flow. Thermostatic valves will NOT provide the desired accuracy
outside of their flow capacity range. Minimum flows must be no less than shown (see Flow Capacities, page 12).
If installed on a recirculated hot water system, make certain the valve is piped according to Leonard’s Required
Piping Methods (see page 4).
REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE CLEANED AND MAINTAINED
ON A REGULAR BASIS. (SEE MAINTENANCE GUIDE AND RECORD, MGR-1001).
3
1. Remove SNAP CAP, SCREW & WASHER & POINTER.
2. Loosen LTR screw, and remove retaining ring and stop.
3. Temporarily place POINTER on the spline rod, adjust to
desired temperature, and remove the pointer.
4. Push stop on rod so that its LEFT edge is resting against the
fine adjustment screw on cover.
5. Turn fine adjustment screw if necessary, (clockwise for slightly
higher temperature, counter clockwise for slightly lower
temperature).
6. The new maximum temperature has now been set. Test this
temperature by holding a thermometer under the flow of water
to be certain it is as desired.
RETAINING RING
SCREW
ADJUSTMENT
FINE
H
L
WEB
D
T
O
C
STOP
LTR SET SCREW

SETUP INSTRUCTIONS
FOR BOTH 2020B-2P AND 1520A-2P
8. Open ball valve V2R and shut ball valve V2L at the mixing
valve.
9. Set outlet temperature of the mixing valve LVR to the same
temperature as step 7.
10. Turn off enough fixtures for a flow of at least 2 GPM (7.6
l/min) downstream from this system. Make sure each fixture
is set to deliver full "HOT" water.
11. Open V1L, shut off ball valve V2R
12. Set outlet temperature of mixing valve SVL to the same
temperature as Step 7.
13. Open V1R and shut V1L, set outlet temperature of SVR
mixing valve to the same temperature as STEP 7.
14. Open all outlets. System is operational. To balance
circulation system temperature, see page 5 .
1. The Parallel Unit MUST be piped according to a Leonard
Required Piping Method 5 (see page 4).
2. Make sure full hot and cold supplies to this assembly are
operating. The temperature of the hot water source must be
properly set and maintained.
3. The circulator (if used) must be turned OFF before setup.
4. Turn on enough fixtures for a flow of at least 30 GPM (114
l/min.) downstream from this system. Make sure each fixture
is set to deliver full "HOT" water.
5. Close outlet ball valves V1R,V2R, V1L.
6. Make sure ball valve V2L is in the full open position.
7. Set outlet temperature of the mixing valve LVL to the required
level.
NOTE! FOR OPTIONAL OUTLET SETUP PIPING ARRANGEMENT, SEE PAGE 12
HOT
INLET COLD
INLET
V2R
V1R
LVR
THERMOMETER
SVR
V2LV1L
LVL
SVL
40
20
100
30
20
0°F 140
LEONARD
60
°C
0
-10
10
120
R40
50
60 80
LEONARD
THERMOSTATIC
C
H
ASSE
1017
LEONARD
THERMOSTATIC
C
H
ASSE
1017
4

REQUIRED PIPING METHOD #5
PROCEDURE TO BALANCE CIRCULATION SYSTEM
1. MAKE SURE NO WATER IS BEING DRAWN IN THE BUILDING. OPEN BALANCING VALVE #1
APPROXIMATELY HALF WAY AND START CIRCULATOR. KEEP BALANCE VALVE #2 CLOSED AT
THIS TIME
2. OBSERVE TEMPERATURE UNTIL IT STABILIZES.
3. CLOSE BALANCING VALVE #1 SLIGHTLY IF TEMPERATURE IS TOO HOT, OR OPEN IT SLIGHTLY
IF TEMPERATURE IS TOO COLD. ALLOW TEMPERATURE TO STABILIZE, REPEAT UNTIL DESIRED
CIRCULATION TEMPERATURE IS SET.
4. IF UNABLE TO REACH DESIRED TEMPERATURE WITH VALVE #1 IN THE FULL OPEN POSITION,
OPEN BALANCE VALVE #2 IN SMALL INCREMENTS (i.e. 1/8, ¼, 3/8, ETC) UNTIL DESIRED
TEMPERATURE IS ACHIEVED.
REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE CLEANED AND
MAINTAINED ON A REGULAR BASIS (SEE MAINTENANCE GUIDE AND
RECORD, MGR-1001).
5
SYSTEM FIXTURES
HOT
WATER
SOURCE
COLD
SUPPLY
CIRCULATOR
AQUASTAT
BALANCING
HEAT
TRAP
VALVE
CHECK
FULL RETURN
LINE SIZE
VALVE #1
TEMPERED
RETURN
HIGH TEMPERATURE RETURN
BALANCING VALVE #2
WITH CHECK
BALL VALVE FOR
SETUP (OPTIONAL)
CT
C
CIRCULATOR
HIGH TEMPERATURE FIXTURES
ISOLATION
VALVE
VALVE
CHECK
TEMPERED
40
20
100 3020
0°F 140
LEONARD
60°C
0
-10
10
120
40
50
60 80
LEONARD
THERMOSTATIC
C
H
ASSE
1017
LEONARD
THERMOSTATIC
C
H
ASSE
1017

INSTRUCTIONS FOR SERVICING
SMALLER TM2020B VALVE
1. Remove screw, snap cap, and handle.
2. Loosen LTR set screw
3. Turn off hot and cold supplies at screwdriver checkstops.
Remove M20-2C (CP) cover screws to release cover and
thermostatic control assembly.
4. To remove bridge assembly, TM-28-1-8B, remove pointer
rod nut (MU-10B) and pull bridge assembly off control rod.
5. To clean submerge bridge assembly in clean water or non-
corrosive cleaning solution. DO NOT USE ABRASIVES!
Be certain thimble moves freely on port sleeve. Note!
Driving ball on thimble must engage coil bracket in
assembling.
6. To disassemble bridge assembly, see drawing next page
(remove TM25-3A holder nuts with screwdriver in slots
provided).
7. To clean thermostat coil, remove retaining ring and stop,
loosen gland nut. Push rod through cover. Be careful not to
pull coil out of shape.
INSTRUCTIONS FOR SERVICING
LARGER TM2020B VALVE
1. Loosen LTR set screw
2. Remove snap cap, screw and washer, friction spring and
pointer.
3. Turn off hot and cold supplies at checkstops. Remove TM-16
cover screws to release cover and thermostatic control
assembly.
4. To clean port sleeve assembly, (the thimble must move freely
on the port sleeve): unscrew the check nut as far as it will go,
then screw the port sleeve nut into the base. The port sleeve
and thimble may be lifted out. SEE DWG BELOW
5. Clean in a non-corrosive cleaning solution. DO NOT USE
ABRASIVES! The port sleeve should be reassembled in the
valve.
6. To clean thermostat group, remove coil sleeve stud and take
off thermostat group.
7. Clean in a non-corrosive cleaning solution.
8. When reassembling, make sure driving ball of thermostat
group engages the ball socket of the port sleeve assembly.
NUT
SLEEVE
PORT
SLEEVE
PORT
NUT
CHECK
THIMBLE
MU-10B
POINTER ROD NUT
BRIDGE ASSY
TM-28-1-8B
SMALL VALVE
Repair Kit # 1/26 (Packings &
Gaskets)
Repair Kit #R/28 (Rebuilding
Kit)orTM28-1-8B Bridge
Assembly
RepairKit#R/28 (Rebuilding
Kit) or TM-28-G2
Thermostat Group
Repair Kit #4/M20 (Checkstop
Kit)
LARGE VALVE
Repair Kit # 1/200Y
Repair Kit # R/200N
Repair Kit # R/200N
Repair Kit #2/200Y
1. Leaks at stem.
2. Leak between valve cover and base.
3. Valve delivers either all hot or all cold water, or
will not mix consistently.
4. After cleaning or replacing port sleeve/ bridge
assembly, valve performance is not consistent.
5. Hot water by-pass into cold line(or cold into hot).
6. Supplies cannot be shut off completely. Supplies
leak at checkstop bonnets.
PACKING & GASKETS
PORT SLEEVE/BRIDGE
ASSEMBLY
THERMOSTAT
GROUP
CHECKSTOPS
TROUBLESHOOTING INSTRUCTIONS
Note: Provide serial number when ordering parts for each valve!
6
GASKET
COVER
M20-3C
SNAP CAP
CONTROL ASSEMBLY
THERMOSTATIC
TM28-1-12B
POINTER SCREW
W/WASHER
COVER SCREWS
(4 REQ'D) LTR SCREW
M20-2C (CP)
COVER
SCREWS
POINTER
TM-2020B-2P INSTRUCTIONS

TM-2020B LARGE VALVE PARTS
LOWER STEM &
PACKING/O'RING
SWIVEL NUT
4707
SWIVEL
4704
4724
4733 4728
CAP WASHER
313
O'RINGS (2)
YELLOW
SPRING
4742 CAP
4723
UPPER STEM
4727
SET SCREW
TM-36
C
H
THERMOSTATIC
LEONARD
REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE CLEANED AND
MAINTAINED ON A REGULAR BASIS (SEE MAINTENANCE GUIDE AND RECORD)
NOTE:AFTER INSTALLING NEW PARTS IT WILL BE NECESSARY TO RESET THE
ADJUSTABLE HIGH TEMPERATURE LIMIT STOP ON EACH VALVE (SEE PAGE 2).
7
CHECKSTOP PARTS REPAIR KITS
LOCK-TYPE
POINTER
O'RING**
UPPER STEM O'RING (4)
KIT R/200N * REBUILDING KIT
POINTER ROD
KIT 2/200Y * CHECKSTOP KIT
KIT 1/200Y * PACKINGS & GASKETS
THERMOSTAT
TGM-2/125
GROUP
SCREEN
4724
TM-8
STEM O'RING (4)
LOWER STEM
& PACKING
COIL SLEEVE
4733
2 EA:
STUD
SPRING
YELLOW
4742
TGM-1/200
PORT SLEEVE
313
ASSY.
4724
SCREEN
& PACKING
LOWER STEM
NUT ASSY.
PORT SLEEVE
**=2 EA.
4733 **
SPRING
POINTER ROD
MU-5A
O'RING (2)
TM-3/200
**
TM-28A
313
FLANGE
TM-21/125
YELLOW
4742
MU-5A
PKG.
CAP WASHER
4728
FLANGE
PKG.
TM-21/125
**
CAP WASHER
4728
**
30
ASSY
PORT SLEEVE NUT
TM-3/200
FLANGE PACKING
COVER
SCREWS
TM-21/125
POINTER SCREW
W/WASHER
TM-29/29A
PLATE
DIAL
TM-16A TM-16
PORT SLEEVE
TGM-1/200
ASSY
POINTER ROD
FRICTION
SPRING
STOP
TM-25D
TM-15B/200
SNAP CAP
57-L TM-25C
POINTER
COVER THERMOSTAT GROUP
STUD
COIL SLEEVE
TM-8
TM-28A
MU-5A
O'RING (2)
TGM-2/125
DIAL
TM-16
PLATE
THERMOSTATIC
C
H
LEONARD

SMALL TM VALVE PARTS
03307
GLAND NUT
GLAND PACKING
(2 REQ'D)
STOP SCREW
TM-28-1-8B
BRIDGE ASSEMBLY
57-L
W/WASHER
TM-29/29A
POINTER SCREW
SNAP CAP
MU-9D
POINTER
MU-5D
STOP
RETAINING RING
M20-13D TM-36
(2 REQ'D) TGM-1/28
BRIDGE
(2 REQ'D)
HOLDER NUT O'RING
TM-28-6B
TM25-5 P.S. PACKING
(2 REQ'D)
PORT SLEEVE
TM25-3B
ASSEMBLY
POINTER ROD NUT
214
P.S. HOLDER NUT
MU-4C
TM-25-3A
DIAL PLATE
57-D RF
COVER
TM28-G2
THERMOSTAT GROUP
(2 REQ'D)
TM25-3
P.S. HOLDER
M20-10B
M20-3C
GASKET
COVER
& PKG. (2 EACH)
KIT R/28 REBUILDING KIT
KIT 4/M20 CHECKSTOP KIT
CONTROL ASSEMBLY
KIT 1/26 PACKINGS & GASKETS
LOWERSTEM
O'RING (2 EACH)
HOLDER NUT
LOWER STEM
&PACKING
BONNET PKG.
2 EACH:
M20-6A
M20-3C
GASKET
COVER
(2 EACH)
GLAND PKG.
M20-3A
(2 EACH)
MU-4C
STEM O'RING
MU-5A UPPER
GASKET
M20-3C
COVER
M20-3A
BONNET PKG.
TM-28-1-12B
THERMOSTATIC
(2 EACH)
O'RING
MU-5A
M20-6A
TM-28-6B
CHECK SPRING
M20-9A
CHECK SPRING
M20-9A
(2 EACH)
MU-9D
STOP
TM-36
STOP SCREW
REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE CLEANED AND
MAINTAINED ON A REGULAR BASIS (SEE MAINTENANCE GUIDE AND RECORD)
NOTE:AFTER INSTALLING NEW PARTS IT WILL BE NECESSARY TO RESET THE
ADJUSTABLE HIGH TEMPERATURE LIMIT STOP ON EACH VALVE (SEE PAGE 2).
8
CHECKSTOP PARTS REPAIR KITS
LOCK-TYPE
POINTER
MU-4A RF
MU-5A UPPER
CHECKSTOPS STEM PKG.
M20-3A BONNET
PACKING
AND PACKING
UPPER STEM
CHECK SPRING
M20-6A LOWER
STEM & PACKING
M20-9A CHECK BONNET
M20-2A RF

Small Valve
Repair Kit 1/M20
(Packings & Gaskets)
Repair Kit R/M20 TM-20
(Rebuilding Kit) or M20-
1-8B Bridge Assembly
Repair Kit R/M20
(Rebuilding Kit) or M20-
G2 Thermostat Group
Repair Kit 4/M20
(Checkstop Kit)
Large Valve
Repair Kit 1/125Y
Repair Kit R/125
Repair Kit R/125 or TGM-
125
Repair Kit 2/50Y
1. Leak at stem
2. Leak between valve cover and base.
3. Valve delivers either all hot or all cold
water, or will not mix consistently.
4. After cleaning or replacing port
sleeve/bridge assembly, valve performance
is not consistent.
5. Hot water by-pass into cold line (or cold into
hot).
6. Supplies cannot be shut off completely.
Supplies leak at checkstop bonnets.
PACKING & GASKETS
PORT SLEEVE/BRIDGE
ASSEMBLY
THERMOSTAT GROUP
CHECKSTOPS
TROUBLESHOOTING INSTRUCTIIONS
Note: Provide valve serial number when ordering parts for each valve!
See pages 10 & 11 for parts Breakdowns
9
INSTRUCTIONS FOR SERVICING
SMALLER TM1520A VALVE
1. Remove screw, snap cap, and pointer.
2. Loosen LTR set screw.
3. Turn off hot and cold supplies at screwdriver checkstops. Remove
M20-2C(CP) cover screws to release cover and thermostatic
controlassembly.
4. To remove bridge assembly, M20-1-8B, remove pointer rod nut
(MU-10B) and pull bridge assembly off control rod.
5. To clean, submerge bridge in clean water or non-corrosive
cleaning solution. DO NOT USE ABRASIVES! Be certain
thimble moves freely on the port sleeve. Note! Driving stud
(M20-14B) must engage slot in thimble when reassembling.
6. To clean thermostat coil, remove retaining ring and stop, loosen
gland nut. Push rod through cover. Be careful not to pull coil out
of shape.
7. Clean with a non-corrosive cleaning solution. DO NOT USE
ABRASIVES!
INSTRUCTIONS FOR SERVICING
LARGER TM1520A VALVE
1. Loosen LTR set screw.
2. Remove screw, snap cap, and pointer.
3. Turn off hot and cold supplies at screwdriver checkstops. Remove
cover screws to release cover and thermostat group.
4. To clean, port sleeve assembly (the thimble must slide freely on
the port sleeve): unscrew the check nut as far as it will go, then
screw the port sleeve nut into base. The port sleeve and thimble
may then be lifted out.
5. To clean thermostat coil, remove coil sleeve stud and take off
thermostat group.
6. Clean with a non-corrosive cleaning solution. DO NOT USE
ABRASIVES!
7. When reassembling, make sure driving ball of thermostat group
engages the ball socket of the port sleeve assembly.
THERMOSTAT
GROUP
POINTER
DRIVING
BALL
PACKING
SOCKET
BALL
FLANGE
GASKET
COVER
M20-3C
POINTER
SNAP CAP
CONTROL ASSEMBLY
THERMOSTATIC
TM28-1-12B
POINTER SCREW
W/WASHER
COVERSCREWS
(4REQ'D) LTR SCREW
M20-2C (CP)
COVER
SCREWS
NUT
CHECK
THIMBLE
PORT
SLEEVE
PORT
SLEEVE
NUT
M20-1-8B
BRIDGE ASSY
MU-10B
POINTER ROD NUT
THIMBLE
P.S. HOLDER NUT
M20-5B
PORTSLEEVE
TM-1520A INSTRUCTIONS

TM1520A LARGE VALVE PARTS
57-L TM-25C
THERMOSTAT GROUP
TM-16
TM-29/29A
POINTER SCREW
W/WASHER
DIAL PLATE
FLANGE PACKING
COVER
SCREWS
SNAP CAP POINTER
30
FRICTION
SPRING
STOP
ASSY
PORT SLEEVE NUT
POINTER ROD
TM-28A
COIL SLEEVE
STUD
TM-8
H
C
O'RING (2)
MU-5A
THERMOSTATIC
LEONARD
TGM-2/125
TM-3/125
TM21/125
TM-16A/125
TGM-1/125
PORT SLEEVE ASSY
TM-15B/125
COVER
TM-25D
CHECKSTOP PARTS
LOCK-TYPE POINTER
REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE
CLEANED AND MAINTAINED ON A REGULAR BASIS. SEE
MAINTENANCE GUIDE AND RECORD MGR-1001.
NOTE: AFTER INSTALLING NEW PARTS IT WILL BE
NECESSARY TO RESET THE ADJUSTABLE HIGH
TEMPERATURE LIMIT STOP ON EACH VALVE (SEE PAGE 8).
REPAIR KITS
10
04/125
SPRING
LOWER STEM & PACKING
SWIVEL
SWIVEL NUT
010
TM-02
BONNET
STRAINER CAP
06
014
CAP PACKING
013
MU-5A
SCREEN
1529
UPPER STEM
03 05
BONNET PACKING
YELLOW
O'RING
09/125
TM21/125
TM21/125
**=2 EA.
03**
LOWER STEM
& PACKING
COIL SLEEVE
TM-8
STUD
03
& PACKING
LOWER STEM
2 EA:
014**
CAP PACKING
CAP PACKING
SPRING
1529 014
O'RING (2)
MU-5A
O'RING
MU-5A
NUT ASSY.
PORT SLEEVE
013
SCREEN
TM-28A
POINTER ROD
05
BONNET PKG.
FLANGE PKG
1529
MU-5A
O'RING (4) 013**
SCREEN 05**
BONNET PKG.
REPAIR KIT 1/125Y PACKINGS & GASKETS
REPAIR KIT R/125 TM-1520A REBUILDING KIT
REPAIR KIT 2/50Y CHECKSTOP KIT
FLANGE PKG
PORT SLEEVE ASSY
YELLOW
SPRING
YELLOW
**
TGM-2/125
TGM-1/125
THERMOSTAT GROUP
TM-3/125
POINTER SET SCREW
TM-36

TM1520A SMALL VALVE PARTS
REPAIR KITSCHECKSTOP PARTS
LOCK-TYPE POINTER
REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE
CLEANED AND MAINTAINED ON A REGULAR BASIS. SEE
MAINTENANCE GUIDE AND RECORD MGR-1001.
NOTE: AFTER INSTALLING NEW PARTS IT WILL BE NECESSARY
TO RESET THE ADJUSTABLE HIGH TEMPERATURE LIMIT STOP ON
EACH VALVE (SEE PAGE 8).
11
REPAIR KIT 4/M20 CHECKSTOP KIT
REPAIR KIT 2/M20 PORT SLEEVE KIT
REPAIR KIT R/M20 REBUILDING KIT
M20-1-12B
M20-6B
O'RING (2 EACH)
HOLDER NUT
THERMOSTATIC
CONTROL ASSEMBLY
M20-3A
BONNET PKG.
(2 EACH)
M20-9A
(2 EACH)
CHECK SPRING
M20-6A
LOWER STEM
& PKG. (2 EACH)
P.S. PACKING
(2 EACH)
M20-3B
M20-G1
SLEEVE ASSY.
PORT
COVER
M20-3C
GASKET
MU-5A
(2 EACH)
O'RING
M20-6B
HOLDER NUT
O'RING (2 EACH)
& PKG. (2 EACH)
M20-3A LOWER STEM
BONNET PKG.
(2 EACH)
CHECK SPRING
(2 EACH)
M20-9A
(2 EACH)
MU-4C
GLAND PKG. GASKET
M20-6A
COVER
M20-3C
(2 EACH)
O'RING
MU-5A
REPAIR KIT 1/M20 PACKINGS & GASKETS
MU-13D
DRIVING
STUD
M20-14B
ASSEMBLY
PORT SLEEVE
POINTER ROD NUT
RETAINING RING
POINTER SCREW
W/WASHER
57-M
M20-3B
M20-1B
BRIDGE P.S. PACKING
(2 REQ'D)
(2 REQ'D)
HOLDER NUT O'RING
M20-6B
(2 REQ'D)
M20-14B
DRIVING
BRIDGE ASSEMBLY
M-20-1-8B
POINTER
STUD
MU-9D
STOP
MU-5D MU-4C
GLAND PACKING
57-D(RF)
GLAND NUT
M20-4B
P.S. HOLDER NUT
M20-5B
(2 REQ'D)
P.S. HOLDER
(2 REQ'D) M20-G1
THERMOSTAT GROUP
COVER
GASKET
DURA-trol
M20-G2
R
MU-10B
SNAP CAP
57-L(CP) M20-3C M20-1C(RF)(CP)
COVER
POINTER SET SCREW
TM-36
AND PACKING
UPPER STEM
CHECK SPRING
M20-6A LOWER
STEM & PACKING
M20-9A CHECK BONNET
M20-2A RF
MU-4A RF
MU-5A UPPER
CHECKSTOPS STEM PKG.
M20-3A BONNET
PACKING

OPTIONAL OUTLET SETUP PIPING
(BY OTHERS)
The addition of this piping arrangement (extra
tee and ball valve) eliminates the need to turn
fixtures on and off throughout the building at
setup. The flows required in the setup
instructions (page 3) are set by using Ball Valve
A. (make sure main outlet ball valve is closed).
CAUTION! ALL THERMOSTATIC WATER MIXING VALVES AND SYSTEMS HAVE
LIMITATIONS! THEY WILL NOT PROVIDE THE DESIRED PERFORMANCE OUTSIDE
OF THEIR FLOW CAPACITY RANGE! CONSULT THE CAPACITY CHART BELOW
AND OBSERVE MINIMUM FLOWS SHOWN.
FLOW CAPACITIES
LIMITED WARRANTY
Leonard Valve Company warrants the original purchaser that products manufactured by them (not by others) will
be free from defects in materials and workmanship under normal conditions of use, when properly installed and
maintained in accordance with Leonard Valve Company's instructions, for a period of one year from date of
shipment. During this period the Leonard Valve Company will at its option repair or replace any product, or part
thereof, which shall be returned, freight prepaid, to the Leonard factory and determined by Leonard to be
defective in materials or workmanship. There are no warranties, express or implied, which extend beyond the
description contained herein. There are no implied warranties of merchantability or of fitness for a particular
purpose. In no event will Leonard be liable for labor or incidental or consequential damages. Any alteration or
improper installation or use of the product will void this limited warranty.
12
TM-2020B-2P
SYSTEM PRESSURE DROP (PSIG)
MINIMUM
(l/min)
(GPM)
FLOW
2.0
8825734442 640
10
169
.7
117
.3
5
194 218
15
.97 1.4
20
1120977 1067927
245 258
1.7
25
2.1
30
282 296
2.4
35 40
2.8
l/min
1215 1283
321 339
3.1
45
3.4
50
GPM
PSI
BAR
PARALLEL
MAIN OUTLET
BALL VALVE
BALL VALVE A
10
-10 20
0
40
140
°F
0
60
°C
50
LEONARD
20
40
R
30
120
100
60
80
TEMPERED WATER
TO BUILDING
TM-1520A-2P
MINIMUM
(l/min)
(GPM)
FLOW
2.0
8541454273 371
10
98
.7
.3
72
5
1.4.97
120 143
15 20
795681 738 636
2.11.7
168 180
25 30
2.82.4
195 210
35 40
SYSTEM PRESSURE DROP (PSIG)
897 939 l/min
3.1 3.4
237 248
45 50
GPM
PSI
BAR
PARALLEL
© 2005 Leonard Valve Company
Printed in USA