Leonard TM-2020B-2P, TM-1520A-2P, TM-1520A-DT, TM-2020A-DT Installation Adjustment Service

Bulletin G10N2

INSTALLATION ADJUSTMENT SERVICE

2

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

60

80

100

20

30

40

LEONARD

10

R

40

0

20

-10

50

120

60°C

0 °F

140

60

80

30

100

20

40

10

LEONARD

40 R

0

20

-10

50

60

120

°C
°F

0

140

February 2007

46"

HOT

LEONARD

THERMOSTATIC

H

C

ASSE

1017

1

33

"

LEONARD

THERMOSTATIC

H

C

ASSE

1017

C

COLD

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.

LEONARD VALVE CO.
CRANSTON RI USA

US. Patents 2.970, 3,061,195 3.152,760

TYP TM

LEONARD VALVE CO.
CRANSTON RI USA

US. Patents 2.970, 3,061,195 3.152,760

TYP TM

39"

L

3"

HOT COLD

28"

TM-1520A -2PTM-2020B -2P

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.

CAUTION

All thermostatic water-mixing valves have limitations. They will not provide the desired
accuracy outside of their flow capacity range. Consult the capac ity chart on page 12. Minimum
flow must be no less than as shown.

1360 Elmwood Avenue, Cranston, RI 02910 USA

Phone: [phone] Fax: [phone]

Email: [e-mail]

Web Site: http://www.leonardvalve.com

TM-2020B-2P ADJUSTMENT AND SERVICE ONLY

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.

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

WARNING

These mixing valves are equipped with an adjustable high tempera ture 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 stop MUST BE RESET BY THE INSTALLER!

TO RESET ADJUSTABLE HIGH TEMPERATURE LIMIT STOP:

TM-2020B SMALL MIXING VALVES TM-2020B LARGE MIXING VALVES

LTR SET SCREW

STOP

LEONARD

THERMOSTATIC

C

POINTER

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 the 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.

SCREW

H

LTR

SET SCREW

SNAP

CAP

STOP

WEB

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
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.

D

L

C

H

O

T

RETAINING RING

FINE

ADJUSTMENT

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

TM-1520A-2P ADJUSTMENT AND SERVICE ONLY

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.

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

WARNING

These mixing valves are equipped with an adjustable high tempera ture 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 stop MUST BE RESET BY THE INSTALLER!

TO RESET ADJUSTABLE HIGH TEMPERATURE LIMIT STOP:

TM-1520A SMALL MIXING VALVETM-1520A LARGE MIXING VALVE

LTR SET SCREW

C

STOP

L

D

STOP

SCREW

H

LTR

POINTER

C

LEONARD

THERMOSTATIC

SET SCREW

SNAP

CAP

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
the 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.

FINE

ADJUSTMENT

SCREW

WEB

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.

T

O

H

RETAINING RING

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

SETUP INSTRUCTIONS

FOR BOTH 2020B -2P AND 1520A-2P

THERMOMETER

V1L

V2L

LVL

SVL

HOT

INLET

60

80

100

20

30

40

10

LEONARD

R

40

0

50

20

-10
60

120

°C
°F

0

140

V2R

V1R

LVR

LEONARD

THERMOSTATIC

H

C

ASSE

1017

LEONARD

THERMOSTATIC

H

C

ASSE
1017

SVR

COLD

INLET

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

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 .

4

HOT

WATER

SOURCE

REQUIRED PIPING METHOD #5

HIGH TEMPERATURE FIXTURES

SYSTEM FIXTURES

BALL VALVE FOR

SETUP (OPTIONAL)

100

40

50

120

FULL RETURN

LEONARD

THERMOSTATIC

H

C

ASSE

1017

LINE SIZE

TEMPERED
CIRCULATOR

CHECK

VALVE

ISOLATION

VALVE

HEAT

TRAP

60

80

3020

40

10

LEONARD

0

20

-10

60°C

0 °F

140

LEONARD

THERMOSTATIC

H

C

ASSE

1017

BALANCING VALVE #2
WITH CHECK

AQUASTAT

C

T

CHECK

VALVE

BALANCING
VALVE #1

TEMPERED
RETURN

COLD

SUPPLY

HIGH TEMPERATURE RETURN

C

CIRCULATOR

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

POINTER ROD NUT

TM-2020B-2P INSTRUCTIONS

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.

THIMBLE

CHECK
NUT

INSTRUCTIONS FOR SERVICING

M20-3C
COVER

GASKET

M20-2C (CP)

COVER

SCREWS

SMALLER TM2020B VALVE

COVER SCREWS

POINTER SCREW

W/WASHER

SNAP CAP

(4 REQ'D)

POINTER

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 non­corrosive 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.

BRIDGE ASSY

LTR SCREW

TM-28-1-8B

TM28-1-12B

THERMOSTATIC

CONTROL ASSEMBLY

PORT
SLEEVE

PORT
SLEEVE
NUT

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.

TROUBLESHOOTING INSTRUCTIONS

Note: Provide serial number when ordering parts for each valve!

PACKING & GASKETS

PORT SLEEVE/BRIDGE
ASSEMBLY

THERMOSTAT
GROUP

CHECKSTOPS

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.

MU-10B

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.

LARGE VALVE

Repair Kit # 1/200Y

Repair Kit # R/200N

Repair Kit # R/200N

Repair Kit #2/200Y

SMALL VALVE

Repair Kit # 1/26 (Packings &
Gaskets)

Repair Kit #R/28 (Rebuilding
Kit) or TM28-1-8B Bridge
Assembly

Repair Kit #R/28 (Rebuilding
Kit) or TM -28-G2

Thermostat Group

Repair Kit #4/M20 (Checkstop
Kit)

6

TM-2020B LARGE VALVE PARTS

57-L

SNAP CAP

TM-29/29A

POINTER SCREW

W/WASHER

CHECKSTOP PARTS

4707

SWIVEL NUT

4704

SWIVEL

LOCK-TYPE

POINTER

TM-25C

POINTER

4733

LOWER STEM &

PACKING/O'RING

4724

YELLOW

SPRING

TM-16A

DIAL

PLATE

4742

TM-16

COVER

SCREWS

4727

UPPER STEM

313

O'RINGS (2)

C

TM-15B/200

COVER

TM-25D

STOP

30
FRICTION
SPRING

TM-21/125

FLANGE PACKING

4728

CAP WASHER

4723

CAP

LEONARD

THERMOSTATIC

H

TM-36

SET SCREW

TGM-2/125

THERMOSTAT GROUP

TM-8

COIL SLEEVE

STUD

POINTER ROD

TGM-1/200

PORT SLEEVE

ASSY

KIT 1/200Y * PACKINGS & GASKETS

**=2 EA.

4733

LOWER STEM

& PACKING

KIT R/200N * REBUILDING KIT

PORT SLEEVE

NUT ASSY.

TM-8

COIL SLEEVE

STUD

KIT 2/200Y * CHECKSTOP KIT

2 EA:

4733

LOWER STEM

& PACKING

MU-5A

O'RING (2)

TM-28A

TM-3/200

PORT SLEEVE NUT

ASSY

REPAIR KITS

MU-5A

O'RING**

TM-21/125

FLANGE

4742

YELLOW

SPRING

**

TM-3/200

PORT SLEEVE

313

STEM O'RING (4)

PKG.

**

UPPER STEM O'RING (4)

MU-5A

POINTER ROD

O'RING (2)

TGM-1/200

ASSY.

4742

YELLOW

SPRING

POINTER ROD

SCREEN

313

TM-28A

4724

LEONARD

THERMOSTATIC

C

4724

SCREEN

H

TM-16

DIAL
PLATE

**

CAP WASHER

TM-21/125

FLANGE

PKG.

TGM-2/125

THERMOSTAT

GROUP

4728

CAP WASHER

4728

**

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

SMALL TM VALVE PARTS

57-L

SNAP CAP

TM-29/29A

POINTER SCREW

W/WASHER

CHECKSTOP PARTS REPAIR KITS

CHECKSTOPS

M20-13D

RETAINING RING

MU-5D

POINTER

BRIDGE ASSEMBLY

M20-3A BONNET

PACKING

M20-6A LOWER

STEM & PACKING

STOP SCREW

MU-9D

STOP

TM-28-1-8B

M20-9A

CHECK SPRING

TM-36

GLAND NUT

GLAND PACKING

MU-4A RF

UPPER STEM

AND PACKING

CHECK BONNET

MU-5A UPPER

STEM PKG.

57-D RF

MU-4C

(2 REQ'D)

M20-2A RF

03307

DIAL PLATE

P.S. HOLDER NUT

(2 REQ'D)

TM-28-6B

HOLDER NUT O'RING

(2 REQ'D)

214

TM-25-3A

COVER

TM25-5

BRIDGE

M20-3C
COVER

GASKET

TM28-G2

THERMOSTAT GROUP

TM25-3

P.S. HOLDER

(2 REQ'D)

PORT SLEEVE

TM25-3B

P.S. PACKING

(2 REQ'D)

KIT 1/26 PACKINGS & GASKETS

MU-4C

GLAND PKG.

(2 EACH)

M20-3A

BONNET PKG.

(2 EACH)

M20-3C
COVER

GASKET

M20-9A

(2 EACH)

CHECK SPRING

KIT R/28 REBUILDING KIT

M20-10B

POINTER ROD NUT

TGM-1/28

ASSEMBLY

TM-28-6B

HOLDER NUT

O'RING (2 EACH)

MU-5A
O'RING
(2 EACH)

M20-6A

LOWER STEM

& PKG. (2 EACH)

LOCK-TYPE

TM-36

STOP SCREW

M20-3C

COVER

GASKET

TM-28-1-12B

THERMOSTATIC

CONTROL ASSEMBLY

POINTER

KIT 4/M20 CHECKSTOP KIT

STOP

MU-9D

2 EACH:

LOWER STEM

M20-6A

& PACKING

CHECK SPRING

M20-9A

MU-5A UPPER

STEM O'RING

M20-3A

BONNET PKG.

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

TM-1520A INSTRUCTIONS

INSTRUCTIONS FOR SERVICING

LARGER TM1520A VALVE

PORT
SLEEVE
NUT

THIMBLE

CHECK
NUT

BALL
SOCKET

FLANGE
PACKING

DRIVING

POINTER

BALL

THERMOSTAT

GROUP

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.

PORT
SLEEVE

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.

INSTRUCTIONS FOR SERVICING

SMALLER TM1520A VALVE

COVER SCREWS

POINTER SCREW

W/WASHER

SNAP CAP

(4 REQ'D)

POINTER

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
control assembly.

4. To remove bridge assembly, M20 -1-8B, remove pointer rod nut
(MU-10B) and pull bridge assembly off control rod.

MU-10B

POINTER ROD NUT

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!

LTR SCREW

THERMOSTATIC

CONTROL ASSEMBLY

M20-1-8B

BRIDGE ASSY

TM28-1-12B

PORT SLEEVE

THIMBLE

M20-5B

P.S. HOLDER NUT

M20-3C
COVER

GASKET

M20-2C (CP)

COVER

SCREWS

PACKING & GASKETS

PORT SLEEVE/BRIDGE
ASSEMBLY

THERMOSTAT GROUP

CHECKSTOPS

TROUBLESHOOTING INSTRUCTIIONS

Note: Provide valve serial number when ordering parts for each valve!

Large Valve

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.

Repair Kit 1/125Y

Repair Kit R/125

Repair Kit R/125 or TGM ­125

Repair Kit 2/50Y

See pages 10 & 11 for parts Breakdowns

9

Small Valve
Repair Kit 1/M20

(Packings & Gaskets)

Repair Kit R/M20 TM-20
(Rebuilding Kit) or M20­1-8B Bridge Assembly

Repair Kit R/M20
(Rebuilding Kit) or M20­G2 Thermostat Group

Repair Kit 4/M20
(Checkstop Kit)

TM1520A LARGE VALVE PARTS

TM-15B/125

57-L

SNAP CAP

TM-25C

POINTER

TM-29/29A

POINTER SCREW

W/WASHER

TM-16A/125

DIAL PLATE

FLANGE PACKING

CHECKSTOP PARTS

LOWER STEM & PACKING

03

1529

SPRING

YELLOW

SWIVEL

09/125

SWIVEL NUT

UPPER STEM

04/125

010

MU-5A

O'RING
013

SCREEN

LOCK-TYPE POINTER

COVER

TM-25D

STOP

30
FRICTION
SPRING

TM-16

COVER

SCREWS

TM21/125

BONNET PACKING

STRAINER CAP

05

TM-02

BONNET

014

CAP PACKING

06

TGM-2/125

THERMOSTAT GROUP

TM-8

COIL SLEEVE
STUD

MU-5A

O'RING (2)

TM-28A

POINTER ROD

TM-3/125

PORT SLEEVE NUT

ASSY

TGM-1/125

PORT SLEEVE ASSY

REPAIR KITS

REPAIR KIT 1/125Y PACKINGS & GASKETS

**=2 EA.

03**

LOWER STEM

& PACKING

REPAIR KIT R/125 TM-1520A REBUILDING KIT

MU-5A

O'RING (4)

1529

**

SPRING

YELLOW

TM-3/125

PORT SLEEVE

NUT ASSY.

O'RING (2)

LEONARD

THERMOSTATIC

C

TM21/125

FLANGE PKG

TM-28A

POINTER ROD

MU-5A

H

013**

SCREEN

05**

BONNET PKG.

014**

CAP PACKING

TM21/125

FLANGE PKG

POINTER SET SCREW

TM-36

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).

10

THERMOSTAT GROUP

TGM-1/125

PORT SLEEVE ASSY

REPAIR KIT 2/50Y CHECKSTOP KIT

2 EA:

03

LOWER STEM

& PACKING

MU-5A

O'RING

SPRING

YELLOW

1529

TGM-2/125

TM-8

COIL SLEEVE

STUD

013

SCREEN

014

CAP PACKING

05

BONNET PKG.

TM1520A SMALL VALVE PARTS

57-L(CP)

SNAP CAP

57-M

POINTER SCREW

W/WASHER

M20-3A BONNET

CHECKSTOPS

MU-13D

RETAINING RING

MU-5D

POINTER

M-20-1-8B

BRIDGE ASSEMBLY

PACKING

CHECK SPRING

M20-6A LOWER

STEM & PACKING

MU-9D

STOP

DRIVING
STUD

M20-9A

M20-14B

MU-4A RF

UPPER STEM

AND PACKING

MU-5A UPPER

STEM PKG.

57-D(RF)

GLAND NUT

MU-4C

GLAND PACKING

(2 REQ'D)

HOLDER NUT O'RING

M20-2A RF

CHECK BONNET

M20-1C(RF)(CP)

COVER

M20-5B

P.S. HOLDER NUT

(2 REQ'D)

M20-6B

(2 REQ'D)

M20-1B

BRIDGE

M20-3C

COVER

GASKET

M20-G2

THERMOSTAT GROUP

DURA-trol

M20-4B

P.S. HOLDER

(2 REQ'D)

PORT SLEEVE

ASSEMBLY

M20-3B

P.S. PACKING

(2 REQ'D)

R

MU-10B

POINTER ROD NUT

M20-G1

M20-14B
DRIVING
STUD

REPAIR KITSCHECKSTOP PARTS

REPAIR KIT 1/M20 PACKINGS & GASKETS

M20-6B

MU-4C

GLAND PKG.

(2 EACH)

M20-9A

CHECK SPRING

(2 EACH)

M20-3A

BONNET PKG.

(2 EACH)

M20-3C
COVER

GASKET

M20-6A

LOWER STEM

& PKG. (2 EACH)

REPAIR KIT R/M20 REBUILDING KIT

HOLDER NUT

O'RING (2 EACH)

MU-5A

O'RING

(2 EACH)

LOCK-TYPE POINTER

POINTER SET SCREW

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).

TM-36

11

M20-3C

COVER

GASKET

M20-1-12B

THERMOSTATIC

CONTROL ASSEMBLY

REPAIR KIT 2/M20 PORT SLEEVE KIT

M20-3B

P.S. PACKING

(2 EACH)

M20-G1

PORT

SLEEVE ASSY.

M20-6B

HOLDER NUT

O'RING (2 EACH)

REPAIR KIT 4/M20 CHECKSTOP KIT

M20-3A

BONNET PKG.

(2 EACH)

M20-9A

CHECK SPRING

(2 EACH)

M20-6A

LOWER STEM

& PKG. (2 EACH)

MU-5A

O'RING

(2 EACH)

TEMPERED WATER

OPTIONAL OUTLET SETUP PIPING

(BY OTHERS)

MAIN OUTLET

BALL VALVE

TO BUILDING

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

80

60

20

30

100

10

40

LEONARD

R

0

40

50

-10

20

60

120

°C
°F

140

0

instructions (page 3) are set by using Ball Valve
A. (make sure main outlet ball valve is closed).

BALL VALVE A

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

SYSTEM PRESSURE DROP (PSIG)

10

.7
98

15 20

120 143

1.4.97

541454273 371

25 30

168

636

2.11.7

180

195 210
738

SYSTEM PRESSURE DROP (PSIG)

10

15

.7

20

.97 1.4

30

1.7252.1

35 40

2.82.4

795681

35 40

2.4

2.8

45 50

3.1 3.4
248

237

PSI
BAR

GPM

897 939 l/min

50

3.1453.4

PSI
BAR

TM-1520A-2P

PARALLEL

TM-2020B-2P

MINIMUM

FLOW
(GPM)

(l/min)

2.0
8

MINIMUM

FLOW
(GPM)

(l/min)

5

.3

72

5

.3

PARALLEL

2.0
8

117

169

194 218

825734442 640

245 258

282

1120977 1067927

321 339

1215 1283

GPM
l/min

296

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.

© 2005 Leonard Valve Company
Printed in USA

12