Leonard TM-2020B-3PS Guide

Bulletin G-11N3
August, 2018
1360 Elmwood Avenue, Cranston, RI 02910 USA
Phone: [phone] Fax: [phone]
Email: [email protected]
Web Site: http://www.leonardvalve.com
INSTALLATIONADJUSTMENT SERVICE
TM-2020B-3PS, TM2020B-3PS-LF
PARALLEL SYSTEMS
IMPORTANT! Provide serial numbers for both valves when ordering parts!!
Small valve manufactured after July 2007 starting with serial # TM26272
INSTALLATION
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.
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.
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 8. Minimum
flow must be no less than as shown.
TM-2020B-3P
0
20
40
50
60
°C
120
-10
140
°F
0
20
80
30
60
40
R
LEONARD
10
100
491
2"
LEONARD
THERMOSTATIC
C
H
ASSE
1017
LEONARD
THERMOSTATIC
C
H
ASSE
1017
LEONARD
THERMOSTATIC
C
H
ASSE
1017
47"
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
!

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
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.
TM-2020B SMALL MIXING VALVES
POINTER SETSCREW
SNAP
CAP
LTR
C
H
THERMOSTATIC
LEONARD
STOP
SCREW
IMPORTANT! ALL MIXING VALVES MUST BE SETAT 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-1000).
2
WEB
ADJUSTMENT
FINE
SCREW
1017
ASSE
COLD HOT
(REST STOP AGAINST SCREW)
SET SCREW
LTR
STOP
POINTER
POINTER SCREW
TM-2020B-3PADJUSTMENT 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-1000
1. Loosen LTR Set Screw, remove POINTER SCREW.
2. Adjust POINTER to maximum desired temperature.
3. Remove POINTER, replace POINTER on spline rod with
STOP (which is cast into the underside on the pointer),
resting against the BOTTOM side of the WEB on the
FINE ADJUSTMENT SCREW.
4. If fine adjustment is needed, adjust FINE ADJUSTMENT
SCREW on the cover, loosen for hotter or tighten for
cooler temperature.
5. Replace POINTER and check temperature, if set to
desired temperature replace POINTER SCREW, and
tighten LTR SET SCREW.
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.
* LIMIT STOP MUST BE RESET AND
RECHECKED EACH TIME HANDLE IS
REMOVED.

SETUP INSTRUCTIONS
TM-2020B-3P PARALLEL SYSTEMS
1. The Parallel Unit MUST be piped according to a Leonard
RequiredPipingMethod5(seepage4).
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 all ball valves, except valve B on valve assembly 1.
6. Make sure ball valve B is in the full open position.
7. Set outlet temperature of mixing valve C to the required level.
8. Open ball valve B on valve assembly 2 and shut ball valve B
on valve assembly 1.
9. Set outlet temperature of the mixing valve C on valve
assembly 2 to the same temperature as step 7.
10. Repeat steps 8 & 9 for valve assembly 3.
11. 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.
12. Close all ball valves, except valve A on valve assembly 1.
13. Make sure ball valve A is in the full open position.
14. Set outlet temperature of mixing valve D to the same
temperature as Step 7.
15. Open ball valve A on valve assembly 2 and shut ball valve A
on valve assembly 1.
16. Set outlet temperature of the mixing valve D on valve
assembly 2 to the same temperature as step 7.
17. Repeat steps 15 & 16 for valve assembly 3.
18. Open all outlets. System is operational. To balance
circulation system temperature, see page 4.
3
ASSE
1017
LEONARD
THERMOSTATIC
50
60
°C
120
-10
140
°F
0
20
80
30
60
40
R
LEONARD
10
100
LEONARD
THERMOSTATIC
C
H
0
20
40
C
H
ASSE
1017
LEONARD
THERMOSTATIC
C
H
ASSE
1017
HOT
INLET COLD
INLET
BA
C
D
THERMOMETER
VALVE
ASSEMBLY 1
VALVE
ASSEMBLY 2
VALVE
ASSEMBLY 3

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-1000).
4
LEONARD
THERMOSTATIC
C
H
ASSE
1017
H
ASSE
1017
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
CHECK
BALL VALVE FOR
SETUP (OPTIONAL)
CT
C
CIRCULATOR
HIGH TEMPERATURE FIXTURES
ISOLATION
VALVE
VALVE
CHECK
TEMPERED
20
80
30
60
40
LEONARD
10
100
LEONARD
THERMOSTATIC
C
H
ASSE
1017
LEONARD
THERMOSTATIC
C
0
20
40
50
60
°C
120
-10
140
°F
0

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.
INSTRUCTIONS FOR SERVICING
SMALLER TM2020B VALVE
1. Loosen LTR set screw
2. Remove screw and handle
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.
NUT
SLEEVE
PORT
SLEEVE
PORT
NUT
CHECK
THIMBLE
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.
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)
TROUBLESHOOTING INSTRUCTIONS
Note: Provide serial number when ordering parts for each valve!
5
TM-2020B-3P INSTRUCTIONS
M20-2C
COVER
SCREWS
LTR SET SCREW
TEMPERATURE
POINTER SCREW
ADJUSTING SCREW
GASKET
COVER
M20-3C
POINTER
CONTROL ASSEMBLY
THERMOSTATIC
TM20-1-12B
POINTER ROD NUT
MU-10B
TM-28-1-8B
BRIDGE ASSY

TM-2020B LARGE VALVE PARTS
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).
6
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
CHECKSTOP 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
(* IF APPLICABLE)

SMALLTM VALVE PARTS
& PKG. (2 EACH)
KIT R/28 REBUILDING KIT
KIT 4/M20 CHECKSTOP KIT
CONTROL ASSEMBLY
KIT 1/26 PACKINGS & GASKETS
LOWER STEM
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
CHECK SPRING
M20-9A
M20-9A
(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).
CHECKSTOP PARTS REPAIR KITS
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
MU-10B
GLANDNUT
GLAND PACKING
(2 REQ'D)
TM-28-1-8B
BRIDGE ASSEMBLY
(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)
PORTSLEEVE
TM25-3B
ASSEMBLY
POINTER ROD NUT
M20-1C RF/CP
P.S. HO LDER NUT
MU-4C
TM-25-3A
DIAL PLATE
57-DRF
COVER
TM28-G2
THERMOSTAT GROUP
(2 REQ'D)
TM25-3
P.S.HOLDER
M20-3C
GASKET
COVER
03307
POINTER
7628
LTR SET SCREW
6910
POINTER SCREW
7520
7

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
1
4
SYSTEM PRESSURE DROP (PSIG)
MINIMUM
(l/min)
(GPM)
FLOW
549488295 428
10
113
.7
78
.3
5
129 145
15
.97 1.4
20
746
651 712617
163 172
1.7
25
2.1
30
188 197
2.4
35 40
2.8
l/min
810 856
214 226
3.1
45
3.4
50
GPM
PSI
BAR
TM-2020B-3P
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
© 2018 Leonard Valve Company
Printed in USA
TRIPLE FLOW RATES AND MINIMUM FLOW FOR ALL VALVES RUNNING
SINGLE VALVE ASSEMBLY FLOWRATES SHOWN
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 beyondthe
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 remainder of this limited warranty shall continue in full force and effect.