Leonard TM-2020B-DT-RF-R1, TM-2020B-LF-DT-RF-R1, TM-2020B, TM-2020B-LF Installation Adjustment Service

INST ALLA TION ADJUSTMENT SERVICE

HIGH-LOW MANIFOLD

TM-2020B-DT-RF-R1

TM-2020B-LF-DT-RF-R1

IMPORTANT! Provide serial numbers for both valves when ordering parts!!

Small valve manufactured after July 2007 starting with serial # TM26272

INSTALLATION

WARNING: This product can expose you to

chemicals including lead, which is known to the State
of California to cause cancer. For more information, go

!

to www.P65Warnings.Ca.gov

METHOD #2

8
0

0
6

20

1

30

0
0

0

10

4

R

LEONARD

40

0

50

-10

2

0

0

2

1

60

°C
°F

0

0
4
1

METHOD #5

8

0

0

6

20

1

30

0

0

0

10

4

R

LEONARD

40

0

50

-10

2

0

0

2
1

60

°C
°F

0

0

4
1

Bulletin G-11ER1

August, 2018

8

0

0

6

20

1

30

0
0

0

10

4

R

LEONARD

40

0

50

-10

2

0

0

2
1

60

°C
°F

0

0

4

LEONARD

THERMOSTATIC

H

C

ASSE
1017

1

1. Type TM manifold 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

8
0

0
6

20

1

30

0
0

0

10

4

R

LEONARD

40

0

50

-10

2

0

0

2
1

60

°C
°F

0

0
4
1

LEONARD

THERMOSTATIC

H

C

ASSE
1017

4. Flush pipes thoroughly after system has been
connected.

5. If this assembly is installed on a recirculated hot water
system it MUST be piped according to LEONARD’S
REQUIRED PIPING METHOD (see page 4 ).

6. Refer to page 3 of this bulletin for correct Setup
Instructions.

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 8. 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

ADJUSTMENT AND SERVICE

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: High Low Manifold 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-1000

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 stop MUST BE RESET BY THE INSTALLER!

TO RESET ADJUSTABLE HIGH TEMPERATURE LIMIT STOP:

TM-2020B LARGE MIXING VALVES

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.

* LIMIT STOP MUST BE RESET AND RECHECKED

EACH TIME HANDLE IS REMOVED.

SCREW

H

LTR

SET SC R EW

SNAP

CAP

1. Loosen LTR Set Screw, remove POINTER SCREW.

2. Adjust POINTER to maximum desired temperature.

3. Remove POINTER, replace POINTER on spline rod with

4. If fine adjustment is needed, adjust FINE ADJUSTMENT

5. Replace POINTER and check temperature, if set to

6. The new maximum temperature has now been set. Test

TM-2020B SMALL MIXING VALVES

FINE

POINTER SCREW

POINTER

STOP

STOP (which is cast into the underside on the pointer),
resting against the BOTTOM side of the WEB on the
FINE ADJUSTMENT SCREW.

SCREW on the cover, loosen for hotter or tighten for
cooler temperature.

desired temperature replace POINTER SCREW, and
tighten LTR SET SCREW.

this temperature by holding a thermometer under the flow
of water to be certain it is as desired.

* LIMIT STOP MUST BE RESET AND
RECHECKED EACH TIME HANDLE IS
REMOVED.

ADJUSTMENT

SCREW

(REST STOP AGAINST SCREW)

LTR

SET SCREW

COLD HOT

ASSE

1017

WEB

IMPORTANT! ALL MIXING V ALVES 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 Method (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-1000).

2

SETUP INSTRUCTIONS

THERMOMETER

80

0

6

20

1

30

0

0

0

10

4

R

LEONARD

40

0

50

-10

2

0

0

2

1

60

°C
°F

0

0

4

1

V2

SMALL

VALVE

HOT

INLET

V1

LEONARD

THERMOSTATIC

H

C

LARGE

VALVE

COLD

INLET

1. The High-Low Unit MUST be piped according to a
Leonard Required Piping Method (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 Valve V1 at the smaller Type TM Valve

6. Make sure Valve V2 at the large Type TM Valve is in the

7. Set outlet temperature of the large Type TM Valve to the
required level.

8. Open outlet Valve V1 at the small TM Valve.

9. Shut outlet Valve V2 at the large TM valve.

10. Turn on 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. Set outlet temperature of the small TM valve to the same
temperature as Step 7.

12. Open outlet Valve V2. System is operational. To balance
circulation system temperature, see page 4.

full open position.

•NOTE! FOR OPTIONAL OUTLET SETUP PIPING ARRANGEMENT , SEE P AGE 8

3

REQUIRED PIPING METHOD #2

FOR SYSTEMS CIRCULATING 8 GPM OR LESS

8

0

0

6

20

1

30

0

0

0

10

4

R

LEONARD

40

0

THERMOMETER

50

-10

2

0

0

2
1

60

°C
°F

0

0

4

1

8

0

0

6

20

1

30

0

0

0

10

4

R

LEONARD

40

THERMOMETER

0

50

-10

2

0

0

2

1

60

°C
°F

0

0

4

LEONARD

THERMOSTATIC

H

C

ASSE
1017

1

CHECK

CIRCUIT SETTER

VALVE

12"

CHECK

VALVE

PROCEDURE TO BALANCE CIRCULA TION SYSTEM

1. MAKE SURE NO WATER IS BEING DRAWN IN THE BUILDING. OPEN CIRCUIT
SETTER APPROXIMATELYHALF WAYAND START CIRCULATOR.

2. OBSERVE TEMPERATURE UNTIL IT STABILIZES.

3. CLOSE CIRCUIT SETTERE 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.

REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE CLEANED AND
MAINTAINED ON A REGULAR BASIS (SEE MAINTENANCE GUIDE AND
RECORD, MGR-100).

4

REQUIRED PIPING METHOD #5

FOR SYSTEMS CIRCULATING GREATER THAN 8 GPM

TEMPERED

CIRCULATORWATER

8

0

0

6

20

1

30

0

0

0

10

4

R

LEONARD

40

0

50

-10

2

0

0

2
1

60

°C
°F

0

0

4

1

LEONARD

THERMOSTATIC

H

C

FROM

CIRCULATOR

8

0

0

6

20

1

30

0

0

10

40

R

LEONARD

40

0

50

-10

2

0

0

2
1

60

°C
°F

0

0

4

1

ISOLATION

VALVE

ASSE
1017

BALANCING

VALVE #1

RETURN TO

HOT WATER

SOURCE

HOT

SUPPLY

COLD

SUPPLY

BALANCING

VALVE #2

PROCEDURE TO BALANCE

1. MAKE SURE NO WATER IS BEING DRAWN IN THE BUILDING. OPEN
BALANCING VALVE #1 APPROXIMATELYHALF WAY AND START CIRCULATOR.
KEEP BALANCE VAL VE #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.

INSTRUCTIONS FOR SERVICING

LARGER TM2020B VALVE

INSTRUCTIONS FOR SERVICING

SMALLER TM2020B VALVE

LTR SET SCREW

POINTER SCREW

M20-2C
COVER

SCREWS

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.

PORT
SLEEVE

PORT
SLEEVE
NUT

THIMBLE

CHECK
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.

POINTER

TEMPERATURE

ADJUSTING SCREW

TM28-1-12B

THERMOSTATIC

CONTROL ASSEMBLY

M20-3C
COVER

GASKET

1. Loosen LTR set set screw.

2. Remove pointer screw, and pointer.

3. Turn off hot and cold supplies at screwdriver checkstops.
Remove M20-2C cover screws to release cover and
thermostatic control assembly.

4. To remove bridge assembly, TM28-1-8B, 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.

TM-28-1-8B

BRIDGE ASSY

MU-10B

POINTER ROD NUT

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.

PACKING & GASKETS

PORT SLEEVE/BRIDGE
ASSEMBLY

THERMOSTAT
GROUP

CHECKSTOPS

TROUBLESHOOTING INSTRUCTIONS

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

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.

6

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)

57-L

SNAP CAP

TM-29/29A

POINTER SCREW

W/WASHER

CHECKSTOP PARTS REPAIR KITS

LARGE TM VALVE PAR TS

TM-25C

POINTER

TM-15B/125

COVER

TM-25D

STOP

30
FRICTION
SPRING

TM-16
COVER
SCREWS

TM-21/125

FLANGE PACKING

TGM-2/125

THERMOSTAT GROUP

TM-8

COIL SLEEVE

STUD

POINTER ROD

TG-1/200

PORT SLEEVE

ASSY

MU-5A

O'RING (2)

TM-28A

PORT SLEEVE NUT

TM-3/200

ASSY

C

LEONARD

THERMOSTATIC

H

TM-16A/125

DIAL
PLATE

* 4707

SWIVEL NUT

(* IF APPLICABLE)

SWIVEL

LOCK-TYPE

POINTER

4733

LOWER STEM &

PACKING/O'RING

4724

*4704

4742

YELLOW

SPRING

4727

UPPER STEM

313

O'RINGS (2)

LEONARD

THERMOSTATIC

C

H

4728

CAP WASHER

4723
CAP

TM-36

SET SCREW

KIT 1/200Y * PACKINGS & GASKETS

**=2 EA.

4733

LOWER STEM

& PACKING

O'RING **

YELLOW

SPRING

**

MU-5A

4742

TM-21/125

FLANGE

PKG.

**

313

UPPER STEM O'RING (4)

4724

SCREEN

KIT R/200N * REBUILDING KIT

TM-28A

POINTER ROD

THERMOSTAT

GROUP

TGM-2/125

PORT SLEEVE

TM-8

COIL SLEEVE

STUD

TM-3/200

NUT ASSY.

MU-5A

POINTER ROD

O'RING (2)

TGM-1/200

PORT SLEEVE

ASSY.

KIT 2/200Y * CHECKSTOP KIT

2 EA:

STEM O'RING (4)

4733

LOWER STEM

& PACKING

313

4742

YELLOW

SPRING

4724

SCREEN

**

4728

CAP WASHER

TM-21/125

FLANGE

PKG.

4728

CAP WASHER

**

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).

6

SMALL TM VALVE PARTS

7520

POINTER SCRE W

CHECKSTOPS

6910

LTR SET SCREW

7628

POINTER

TM-28-1-8B

BRI DGE ASSEMBLY

57-D RF

GLAND NUT

MU-4C

GLAND PACKING

(2 RE Q'D)

03307

DIAL PLATE

H OL DER NUT O 'RING

M20-1C RF/CP

COVER

TM-25-3A

P.S. HOLDER NUT

(2 RE Q'D)

TM-28-6B

(2 RE Q'D)

TM25-5

BRIDGE

M20-3C
COVER

GASKET

TM28-G2

THERMOSTAT GROUP

TM25-3

P.S. HOLDER

(2 RE Q'D)

PORT SL EEVE

TM25-3B

P.S. PACKING

(2 RE Q'D)

POINTE R RO D NUT

TGM-1/28

ASSEMBLY

CHECKSTOP PARTS REPAIR KITS

KIT 1/26 PACKINGS & GASKETS

MU-4C

GLAND PKG.

(2 E A CH)

M20-3A

BONNET PKG.

(2 EACH)

M20-3C
COVER

GASKET

M20-9A

(2 E ACH)

CHECK SPRING

HOLDER NUT

O'RING (2 EACH)

M20-3A BONNET

PACKING

M20-6A LOWER

STEM & PACKING

M20-9A

CHECK SPRING

MU-4A RF

UPPER STEM

AND PACKING

CHECK BONNET

MU-5A UPPER

STEM PKG.

M20-2A RF

MU-10B

TM-28-6B

MU-5A

O'RING

(2 E ACH)

M20-6A

LOWER STEM

& PKG. ( 2 EACH)

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

KIT R/28 REBUILDING KIT

M20-3C
COVER

GASKET

KIT 4/M20 CHECKSTOP KIT

2 EACH:

LOWER STEM

& PACKING

M20-6A

CHECK SPRING

M20-9A

MU-5A UPPER

STEM O'RING

TM-28-1-12B

THERMOSTATIC

CONTROL ASSEMBLY

M20-3A

BONNET PKG.

OPTIONAL OUTLET SETUP PIPING

(BY OTHERS)

BALL VALVE

TEMPERED WATER

TO BUILDING

The addition of this piping arrangement (extra

1" HOSE FTG.

WITH CAP

tee and ball valve) eliminates the need to turn
showers on and off throughout the building at
setup. The flows required in the setup
instructions (page 3) are set by using Ball Valve

FULL LINE SIZE

PIPE TO OUTLET

OF HIGH LOW SYSTEM

OUTLET OF

HIGH-LOW

SYSTEM

BALL VALVE

(A)

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 CAPACITYCHART BELOW AND
OBSERVE MINIMUM FLOWS SHOWN.

FLOW CAPACITIES

MINIMUM

FLOW
(GPM)

(l/min)

5

.3

PRESSURE DROP (PSIG)

15

10

.97

.7 1.4

20

25 35

30

2.11.7

2.4

40

45

3.12.8

50 PSI

3.4

BAR

1.0

(3.8)

78

295

113 145
428

129
488

549

617

172163
651

188
712 810

197
746

214

226
856

GPM

l/min

LIMITED WARRANTY

Leonard Valve Company (hereinafter, “Leonard”) warrants the original purchaser that products manufactured by Leonard will be
free from defects in material or workmanship under normal conditions of use, when properly installed and maintained in
accordance with Leonard’s instructions, for a period of one year from the date of shipment. During this period, Leonard 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. Leonard provides no warranty, express or implied, which
extends beyond the description contained herein. LEONARD SPECIFICALLY DISCLAIMS ANY AND ALL IMPLIED
WARRANTIES OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE. Nonetheless, some
jurisdictions may not allow the disclaimer of certain implied warranties, in which case Leonard hereby limits such implied
warranties to the duration of the limited warranty period contained herein. Some jurisdictions may not allow limitations on how
long an implied warranty lasts, so the foregoing durational limitation may not apply to you. In no event will Leonard be liable for
labor or incidental or consequential damages. Any alteration or improper installation or use of this product will void this limited
warranty. If any provision of this limited warranty is prohibited by law in the applicable jurisdiction, such provision shall be null
and void, but the r emainder of this limited warranty shall continue in full force and effect.

© 2018 Leonard Valve Company
Printed in USA