Leonard TM-186-30015050-PRV Guide

Bulletin G19Z
April, 2020
1360 Elmwood Avenue, Cranston, RI 02910 USA
Phone: [phone] Fax: [phone]
Email: [e-mail]
Web Site: http://www.leonardvalve.com
INSTALLATION ADJUSTMENT SERVICE
HIGH CAPACITY MANIFOLD SYSTEM
TM-186-30015050-PRV
IMPORTANT! Provide valve serial numbers (stamped on cover of valves) when ordering parts!!
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56"
64"
HOT
INLET COLD INLET
OUTLET
CIRCULATION
CONNECTION
APPROX.
INSTALLATION
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 alocation 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. If this assembly is installed on arecirculated
hot water system it MUST be piped according
to aREQUIRED PIPING METHOD (see
page 4).
6. Refer to page 3of this bulletin for correct Setup
Instructions.
Maximum Operating Pressure 125 PSI (8.6 BAR)
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 9. Minimum flow must be no less than as shown.
REMEMBER! THIS IS A CONTROL SYSTEM WHICH MUST BE CLEANED AND MAINTAINED ON A
REGULAR BASIS (SEE MAINTENANCE GUIDE AND RECORD MGR-1000).
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
!

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 stops MUST BE RESET BY THE INSTALLER!
TO RESET ADJUSTABLE HIGH TEMPERATURE LIMIT STOP:
LARGER MIXING VALVE
(TM-300)
1. Remove POINTER ROD NUT and POINTER.
2. 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.
3. Replace POINTER on the spline 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.
4. 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.
SMALLER MIXING VALVES
(TM-150, TM-50)
1. Loosen LTR screw.
2. Remove SNAP CAP, SCREW, WASHER and
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.REASSEMBLE.
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 POINTER
ROD NUT
WEB
C
H
STOP
SCREW
POINTER
SCREW
LTR
SNAP
CAP
THERMOSTATIC
LEONARD
IMPORTANT! ALL THREE MIXING VALVES MUST BE SET AT THE SAME
OPERATING TEMPERATURE.
SEE PAGES: 7 & 8 FOR COMPLETE PARTS BREAKDOWNS
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 9).
If installed on a recirculated hot water system, make certain the valve is piped according to a Required Piping Method (see page 5).
REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE CLEANED AND MAINTAINED ON A REGULAR BASIS. (SEE
MAINTENANCE GUIDE AND RECORD, MGR-1000
2

SETUPINSTRUCTIONS
TM-150
V4
TM-300
A
G1
V1
T1
S1
BC
S2
G2
BLEED HERE
V3
V2
TM-50
1. TM-186-30015050PRV High-Low Unit Must be
piped in accordance with appropriate Piping
Method shown on page 5.
2. Shut down circulator pumps, close valve V3 & V4.
Adjust screw S1 on the reducing pilot fully
clockwise and record water pressure reading on
gauge G1.
3. Carefully adjust screw S1 on the reducing pilot
fully counter-clockwise (CCW) until all spring
tension is relieved.
4. Close outlet valve V1 and V2. Open outlet valve
V3 and make sure it is in the full open position.
5. Open enough fixtures to flow at least 50 GPM
downstream of this assembly (no water will flow at
this time).Vent trapped air in the PRV cover
above the valve labeled Aby loosening highest
point of tube fitting and on cover.Retighten both
fittings.
6. Carefully adjust screw S1 to 20 PSI less than the
pressure recorded in step 2(read pressure on gauge
G1). Water should now be flowing at 50 GPM.
7. Set outlet temperature of mixing valve Ato the
safe required level (read temperature on gauge
T1).
8. Turn off enough fixtures to flow 25 GPM
downstream of the assembly.
9. Carefully adjust screw S2 on the reducing pilot
fully counter-clockwise (CCW) until all spring
tension is relieved.Open V2 and close outlet V3
(V1should remain closed) (no water will flow at
this time).Vent trapped air in the PRV cover by
loosening highest point of tube fitting and on
cover.Retighten both fittings.
10. Carefully adjust screw S2 to 10 PSI less than the
pressure recorded in step 2(read pressure on
gauge G2). Water should now be flowing at 25
GPM.
11. Set outlet temperature of mixing valve labeled B
to the same temperature as step 7. (Read
temperature at gauge T1).
12. Turn off enough fixtures to flow 5GPM
downstream of the assembly.
13. Open outlet valve V1 and close valve V2.
14. Set outlet temperature of mixing valve labeled C
to the same temperature as step 7. (Read
temperature at gauge T1).
15. Turn circulator pump on.Open outlet valves V2
and V3. System is operational.
16. Important! Now proceed to balance recirculated
tempered water system (see page 5).
3

PRESSURE REDUCING VALVE
TROUBLESHOOTING
4
SYMPTOM
Valve fails to open
Valve Fails to
Close or Regulate
CAUSE
Insufficient inlet pressure
No downstream demand
Insufficient spring compression on pressure
reducing pilot
Trapped air
Filter A plugged
Orifice fitting 2 plugged
Regulated pressure pulsates or hunts
Debris trapped in main valve / Diaphragm
in main valve Leaking / Scale on stem
Pressure reducing pilot 3 not serviceable
REMEDY
Check/create inlet pressure
Create demand/flow
Turn adjusting screw on pressure
reducing pilot 3 clockwise
Bleed air from cover and bleed air
from tubing at highest point
Remove in-line filter A and clean
screen
Remove orifice fitting 2 and clean
Bleed air from cover and bleed air
from tubing at highest point
De-pressurized the system and
remove valve cover and
diaphragm to inspect/remove
debris.
Replace pressure reducing pilot
PARTS LIST
A In line, Filter
2 Control Orifice
3 Pressure Reducing Pilot
S Opening Speed Control

SUCH SYSTEMS REQUIRE PIPING WHICH MAY INTRODUCE SIGNIFICANTLY MORE "HOT" WATER INTO THE SYSTEM DURING PERIODS OF NO DRAW
*HIGH FLOW SYSTEMS INCLUDE THOSE WHICH ARE REQUIRED TO RECIRCULATE A FLOW GREATER THAN (25) TWENTY FIVE GALLONS PER MINUTE
PROCEDURE TO BALANCE SYSTEM:
BALANCING VALVE #1
COLD
SUPPLY HIGH TEMPERATURE WATER RETURN
NOTE: THIS PIPING METHOD IS
USED FOR HIGH FLOW SYSTEMS
WHERE THE CIRCULATED FLOW IS
TWENTY FIVE (25) GPM OR
METHOD #5
PROCEDURE TO BALANCE SYSTEM:
TWENTY FIVE (25) GPM.
CIRCULATED FLOW IS EIGHT (8) TO
SYSTEMS WHERE THE
NOTE: THIS PIPING METHOD IS
USED FOR MODERATE FLOW
METHOD #4
GREATER.
BALANCING VALVE #2
BALANCING VALVE #1
TO TWENTY FIVE (25) GALLONS PER MINUTE IS REQUIRED TO MAINTAIN A GIVEN TEMPERATURE
* MODERATE FLOW SYSTEM MAY BE DEFINED AS THOSE IN WHICH A RECIRCULATION FLOW OF EIGHT (8)
HOT WATER
TEMPERATURE
PRESSURE GAUGE
SOURCE
CHECK VALVE.
TRAP
HEAT
WATER
HIGH
PRV
COLD
SUPPLY
CHECK VALVE.
DOMESTIC WATER
CIRCULATOR
RETURN
C
WATER
DOMESTIC TEMPERED
THERMOMETER SETUP (OPTIONAL)
BALL VALVE FOR
CHECK
VALVE AQUASTAT
T
DOMESTIC WATER
HIGH TEMPERATURE WATER RETURN
RETURN
WITH CHECK VALVE
BALANCING VALVE #2
HOT WATER
SOURCE
TEMPERATURE
TRAPHEAT
WATER
PRESSURE GAUGE
HIGH
PRV
VALVE
CIRCULATOR
C
WATER
DOMESTIC TEMPERED
THERMOMETER SETUP (OPTIONAL)
BALL VALVE FOR
CHECK
AQUASTAT
T
WITH CHECK VALVE
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.
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.
ISOLATION
BALL VALVE
ISOLATION
BALL VALVE
5
CONTACT LEONARD FOR ADDITIONAL PIPING METHODS DESIGNED FOR HIGHER FLOW
RECIRCULATED SYSTEMS AND FOR OTHER SPECIAL INSTALLATIONS.

INSTRUCTIONS FOR SERVICING
LARGER TM VALVE
1. Remove pointer rod nut, friction spring and pointer. Shut
off hot and cold supplies to this valve.
2. Remove, cover screws and cover, to which the thermostat
group is attached.
3. 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 the base. The
port sleeve and thimble may then be lifted out.
4. Clean with anon-corrosive cleaning solution. DO NOT
USE ABRASIVES! The port sleeve should be
reassembled in the valve with the shoulder to the left.
5. To Clean thermostat group, remove pointer rod nut and
pointer. Remove coil sleeve stud (8) and take off
thermostat group (TG-2/300).
6. Clean with anon-corrosive cleaning solution. DO NOT
USE ABRASIVES.
7. Replace pointer rod with gear and re-assemble.
8. When reassembling, make sure driving ball of thermostat
group engages the ball socket of the port sleeve assembly.
INSTRUCTIONS FOR SERVICING
SMALLER TM VALVES
1. Loosen LTR screw.
2. Remove snap cap, screw and washer, friction spring and
pointer. Shut off hot and cold supplies to this valve.
3. Remove, cover screws and cover, to which the thermostat
group is attached.
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 the base. The
port sleeve and thimble may then be lifted out. There is no
shoulder for the TM-150 Port Sleeve.
5. Clean with anon-corrosive cleaning solution. DO NOT
USE ABRASIVES! The port sleeve should be
reassembled in the valve with the shoulder to the left.
6. To Clean thermostat group, remove coil sleeve stud and
take off thermostat group.
7. Clean with anon-corrosive cleaning solution. DO NOT
USE ABRASIVES.
8. Replace pointer rod with gear and re-assemble.
9. When reassembling, make sure driving ball of thermostat
group engages the ball socket of the port sleeve assembly.
DRIVING
FLANGE PACKING
BALL SOCKET
BALL
DRIVING
BALL SOCKET
BALL
FLANGE
PACKING
POINTER
THERMOSTAT
GROUP
LTR SCREW
PORT
NUT
SLEEVE
PORT SLEEVE
CHECK
NUT
THIMBLE
CHECK
NUT
THIMBLE
(TM-50)
SHOULDER
PORT
SLEEVE
SLEEVE
NUT
PORT
TROUBLESHOOTING INSTRUCTIONS
Note: Provide valve serial number when ordering parts for either valve!
See pages 7 & 8 for Parts Breakdown
6
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.
TM-300
Kit # 1/300
Packing & Gaskets
Kit # R/300
Rebuilding Kit
Kit # R/300 or
TG-2/300
NA
TM-150
Kit # 1/125
Packing & gaskets
Kit # R/125
Rebuilding Kit
Kit # R/125
TGM-2/125
Kit #2/50
TM-50
Kit # 1/50
Packing & Gaskets
Kit # R/50
Rebuilding Kit
Kit #R/50
TGM-2/50
Kit #2/50

GLAND PACKING
RING (22)
PACKING GLAND
FLANGE PACKING
PACKING GLAND
POINTER (25/300 for TM-300)
COVER SCREWS
(16/300 RF)
SPRING (30)
FRICTION NUT (23)
POINTER ROD
NUT (29) SCREW (26/300)
POINTER LOCK
CHECK NUT
(21/300)
PORT SLEEVE
ASSY (TG-1/300) ASSY (3/3A/300)
COIL SLEEVE
(24)
(TG-4/300)
WITH GEAR
POINTER ROD
STUD (8/300)
(TG-2/300)
THERMOSTAT GROUP
(15/300) COVER
LARGE TM VALVE PARTS
REPAIR KITS
GLAND PKG.
KIT R/300 REBUILDING KIT
3/3A/300
NUT ASSY.
PORT SLEEVE
COIL SLEEVE
8/300
STUD
FLANGE
TG-4/300
GROUP
ASSY.
TGM-1/300
PORT SLEEVE
POINTER ROD
THERMOSTAT
TG-2/300
PKG.
GLAND PKG. 21/300
24
FLANGE
PKG.
21/300 24
KIT 1/300 PACKINGS & GASKETS
REMEMBER! THIS IS ACONTROL DEVICE WHICH MUST BE CLEANED AND MAINTAINED ON A
REGULAR BASIS (SEE MAINTENANCE GUIDE AND RECORD, MGR-1000).
NOTE:AFTER INSTALLING NEW PARTS IT WILL BE NECESSARY TO RESET THE ADJUSTABLE HIGH
TEMPERATURE LIMIT STOP ON EACH VALVE (SEE PAGE 2).
7

SMALLER TM VALVE PARTS
CHECKSTOPPARTS REPAIRKITS
MU-5A
O'RING (4)
CAP PACKING
LOWER STEM
& PACKING
03 011
SPRING CAP PACKING
014
TGM-1/50 (TM50)
PORT SLEEVE
KIT 2/125 (TM150) CHECKSTOP KIT
2 EA:
STEM O'RING
STUD
TM-8
COIL SLEEVE
ASSY.
BONNET PKG.
SCREEN
013 05
THERMOSTAT
TGM-2/50 (TM50)
GROUP
O'RING
POINTER ROD
KIT R/50 (TM50) REBUILDING KIT
PORT SLEEVE
NUT ASSY.
& PACKING
TM3/50 (TM50) POINTER ROD
PKG.
FLANGE
TM-28
KIT 1/125 (TM150) PACKINGS & GASKETS
TM21/50
FLANGE
LOWER STEM
03** SPRING
011**
**=2 EA.
014**
PKG.
BONNET PKG.
05**
013**
SCREEN
TM21/125
TM21/50
TM21/125
TGM-1/125 (TM150)
TGM-2/125 (TM150)
TM3/125 (TM150)
KIT 1/50 (TM50) PACKINGS & GASKETS
KIT R/125 (TM150) REBUILDING KIT
KIT 2/50 (TM50) CHECKSTOP KIT
MU-5A (2)
MU-5A UPPER
MU-5A TM-02
CAP PACKING
06
STRAINER CAP
SPRING
04-125 RF (TM-150)
04-50 RF (TM-50)
SWIVEL NUT
013
SCREEN
014
BONNET
03
LOWER STEM & PACKING
011
BODY
O'RING
UPPER STEM
010
PACKING
05
SWIVEL
09-50 RF (TM-50)
09-125 RF (TM-150)
LOCK-TYPE POINTER
TM valves are furnished
with lockable pointers.
POINTER SET SCREW
TM-36
REMEMBER! THIS IS ACONTROL DEVICE WHICH MUST BE CLEANED AND MAINTAINED ON A
REGULAR BASIS (SEE MAINTENANCE GUIDE AND RECORD, MGR-1000).
NOTE: AFTER INSTALLING NEW PARTS IT WILL BE NECESSARY TO RESET THE ADJUSTABLE HIGH
TEMPERATURE LIMIT STOP ON EACH VALVE (SEE PAGE 2).
8
30
POINTER SCREW
W/WASHER
TM-29/29A
57-L
SNAP CAP
POINTER ROD
TGM-1/50 (TM-50)
PORT SLEEVE
TM-28A
TM-16A/50 (TM-50) COVER
FLANGE PACKING
DIAL PLATE SCREWS
ASSY
FRICTION
SPRING
TM-16
ASSY
PORT SLEEVE NUT
TM3/50 (TM50)
C
H
THERMOSTAT GROUP
COIL SLEEVE
TM-25D
COVER
TM-15B/125 (TM-150)
POINTER
TM-25C STOP STUD
TM-8
TGM-2/125 (TM-150)
MU-5A
O'RING (2)
LEONARD
THERMOSTATIC
TM-15B/50 (TM-50) TGM-2/50 (TM-50)
TM3/125 (TM-150)
TGM-1/125 (TM-150)
TM21/125 (TM-150)
TM21/50 (TM-50)
TM-16A/125 (TM-150)

1692
TM-186-
4" 4"
30015050PRV
101mm 101mm
MODEL IN
OUT
5.0 260 310 360 400 420 430 440 447
1514984
19 13631173 16281590 1666
SYSTEM PRESSURE DROP
20
1.4
L/MIN
.3 .7 1.0
FLOW
(GPM)
5
MINIMUM
10 15 1.7 2.1 2.4 2.8 25 30 35 40
460453
1715 1741 L/MIN
3.1 3.4
GPM
BAR
45 50 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 aperiod 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 aparticular 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.
(A)
BALL VALVE
FULL LINE SIZE
PIPE TO OUTLET
OF HIGH LOW SYSTEM
TEMPERED WATER
TO BUILDING
MAIN OUTLET
BALL VALVE
OUTLET OF
SYSTEM
HIGH-LOW
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.
9
© 2018 Leonard Valve Company
Printed in USA