Leonard TM-2020A Guide

Bulletin G10-E
January 2006
INSTALLATION ADJUSTMENT SERVICE
HIGH-LOW MANIFOLD
TM-2020A
ASSE 1017 LISTED
IMPORTANT! Provide serial numbers for both valves when ordering parts!!
INSTALLATION
1360 Elmwood Avenue, Cranston, RI 02910 USA
Phone: [phone] Fax: [phone]
Email: [email protected]
Web Site: http://www.leonardvalve.com
°F
°C
0
60
140
100
LEONARD
60
20
0
10
30
80
40
R
ASSE
1017
C
THERMOSTATIC
H
LEONARD
1017
ASSE
C
H
THERMOSTATIC
LEONARD
20
40
50
-10
120
30
20 100
20
40
140
0°F
50
-10
60
°C
LEONARD
10
0
R
120
40
80
60
COLD INLET
DOMESTIC OUTLET
HOT INLET
DOMESTIC OUTLET
COLD INLET
HOT INLET
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 METHODS (see pages 4 & 5).
6. Refer to page 3 of this bulletin for correct Setup
Instructions.
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
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.

ADJUSTMENT AND SERVICE
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-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 stop MUST BE RESET BY THE INSTALLER!
TO RESET ADJUSTABLE HIGH TEMPERATURE LIMIT STOP:
SMALL MIXING VALVE
1. Remove POINTER, RETAINING RING and STOP
2. Loosen LTR screw
3. Temporarily place POINTER on the spline rod, turn LEFT for
cooler temperature, turn RIGHT for warmer temperature. When
valve is delivering warmest temperature desired, remove the
pointer
4. Push stop on rod so that its RIGHT edge is resting against the
top side of the web which is cast on the RIGHT SIDE OF THE
COVER.
5. Replace stop retaining ring.
6. Replace POINTER so that it is pointing to the extreme HOT
position. The new maximum temperature has now been set.
Test the temperature by holding a thermometer under the flow
of water to be certain it is as desired.
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
the pointer.
4. Replace POINTER on the spline rod so that its RIGHT edge is
resting against the WEB 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.
IMPORTANT! BOTH 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 8).
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

SETUP INSTRUCTIONS
INLET
COLD
HOT
INLET
VALVE
SMALL
THERMOMETER
V2
VALVE
LARGE
V1
6. Set outlet temperature of the large Type TM Valve to the
required level.
7. Open outlet Valve V1 at the small TM Valve.
8. Shut outlet Valve V2 at the large TM valve.
9. 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.
10. Set outlet temperature of the small TM valve to the same
temperature as the large TM Valve.
11. Open outlet Valve V2. System is operational. To balance
circulation system temperature, see page 4 & 5.
1. The High-Low Unit MUST be piped according to a
Leonard Required Piping Method (see page 4 & 5).
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
full open position.
•NOTE! FOR OPTIONAL OUTLET SETUP PIPING ARRANGEMENT, SEE PAGE 8
3

REQUIRED PIPING METHOD #2
FOR SYSTEMS CIRCULATING 8 GPM OR LESS*
(SEE PAGE 5, PIPING METHODS 4 AND 5 FOR HIGHER FLOW SYSTEMS)
HOT
WATER
SOURCE
COLD SUPPLY
OPTIONAL
AQUASTAT
DOMESTIC TEMPERED
TRAP
HEAT
SUPPLY
TEMPERATURE
HIGH
CHECK VALVE
C
CIRCULATOR
WATER
T
(OPTIONAL)
VALVE #1
CHIGH TEMPERATURE RETURN
VALVE
ISOLATION
PROCEDURE TO BALANCE CIRCULATION SYSTEM
1. MAKE SURE NO WATER IS BEING DRAWN IN THE BUILDING. OPEN VALVE #1
APPROXIMATELY HALF WAY AND START CIRCULATOR.
2. OBSERVE TEMPERATURE UNTIL IT STABILIZES.
3. CLOSE 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.
REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE CLEANED AND
MAINTAINED ON A REGULAR BASIS (SEE MAINTENANCE GUIDE AND
RECORD, MGR-1001).
4

THERMOMETER
HEAT
TRAP
SUPPLY
COLD
SOURCE
WATER
HOT
HIGH TEMPERATURE
SUPPLY
BY-PASS (FULL LINE SIZE)
HIGH TEMPERATURE RETURN
C
WATER FIXTURES
CIRCULATOR
C
DOMESTIC TEMPERED
VALVE #2
VALVE #1
(OPTIONAL)
TAQUASTAT
(OPTIONAL)
METHOD #4
CIRCULATED FLOWS BETWEEN
8-25 GPM
PROCEDURE TO BALANCE SYSTEM:
1. MAKE SURE NO WATER IS BEING DRAWN. OPEN VALVE #1 AND VALVE #2 APPROXIMATELY ½ WAY AND START
CIRCULATOR.
2. OBSERVE TEMPERATURE UNTIL IT STABILIZERS.
3. CLOSE VALVE #1 SLIGHTLY IF TEMPERATURE IS TOO HOT, OR OPEN IT SLIGHTLY IF TEMPERATURE IS TOO COLD AND
ALLOW TEMPERATURE TO STABILIZE. REPEAT UNTIL DESIRED TEMPERATURE IS SET.
4. IF UNABLE TO REACH DESIRED TEMPERATURE OPEN VALVE #2 FULL, REPEAT STEPS 2 AND 3.
5
THERMOMETER
HEAT
TRAP
SUPPLY
COLD
SOURCE
WATER
HOT
HIGH TEMPERATURE
SUPPLY
BY-PASS (FULL LINE SIZE)
HIGH TEMPERATURE RETURN
C
WATER FIXTURES
CIRCULATOR
C
DOMESTIC TEMPERED
VALVE #1
VALVE #2
(OPTIONAL)
AQUASTAT
T
(OPTIONAL)
METHOD #5
CIRCULATED FLOWS GREATER
THAN 25 GPM
PROCEDURE TO BALANCE SYSTEM:
1. MAKE SURE NO WATER IS BEING DRAWN. OPEN VALVE #1 AND VALVE #2 APPROXIMATELY ½ WAY AND START
CIRCULATOR.
2. OBSERVE TEMPERATURE UNTIL IT STABILIZERS.
3. CLOSE VALVE #1 SLIGHTLY IF TEMPERATURE IS TOO HOT, OR OPEN IT SLIGHTLY IF TEMPERATURE IS TOO COLD AND
ALLOW TEMPERATURE TO STABILIZE. REPEAT UNTIL DESIRED TEMPERATURE IS SET.
4. IF UNABLE TO REACH DESIRED TEMPERATURE OPEN VALVE #2 FULL, REPEAT STEPS 2 AND 3.

INSTRUCTIONS FOR SERVICING
SMALLER TM VALVE
1. Loosen LTR set screw
2. Remove screw, snap cap, and handle.
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, TM-28-1-8B, remove pointer
rod nut (M20-10B) 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
stud (M20-14B) must engage slot in thimble when
assembling.
6. To disassemble bridge assembly, see drawing next page
(remove M20-5B holder nuts with screwdriver in slots
provided).
7. Remove thermostat group from bridge assembly, and soak in
a non-corrosive cleaning solution.
INSTRUCTIONS FOR SERVICING
LARGER TM 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 screwdriver checkstops.
Remove TM16 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 “A”.
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.
TROUBLESHOOTING INSTRUCTIONS
Note: Provide serial number when ordering parts for either valve!
SMALL VALVE
Kit # 1/28Y (Packings &
Gaskets)
Kit #R/28 (Rebuilding
Kit) or TM28-1-8B Bridge
Assembly
Kit #R/28 (Rebuilding
Kit) or TM-28-G2
Thermostat Group
Kit #2/28Y (Checkstop Kit)
LARGE VALVE
Kit # 1/200Y
Kit # R/200N
Kit # R/200N
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.
6
PACKING & GASKETS
PORT SLEEVE/BRIDGE
ASSEMBLY
THERMOSTAT
GROUP
CHECKSTOPS

LARGE TM VALVE PARTS
LOCK-TYPE
POINTER
CHECKSTOP PARTS REPAIR KITS
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
LOCK-TYPE
POINTER
CHECKSTOP PARTS REPAIR KITS
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

OPTIONAL OUTLET SETUP PIPING
(BY OTHERS)
The addition of this piping arrangement (extra
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
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
SYSTEM PRESSURE DROP (PSIG)
295(3.8)
1.0 78 129
488
113
428 549
145
5
(GPM)
(l/min)
MINIMUM
FLOW
.3 .97
15
.7
10
1.4
20
172
651617
163
712
188 214
810
197
746 856
226 GPM
l/min
2.1
30
1.7
25
2.4
35
3.1
45
2.8
40
3.4
50
BAR
PSI
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.
9
Printed in USA