Leonard TM-500A User manual

BULLETIN G-6B
August, 2018
1360 Elmwood Avenue, Cranston, RI 02910 USA
Phone: [phone] Fax: [phone]
Email: [email protected]
Web Site: http://www.leonardvalve.com
INSTALLATION SETUPAND OPERATING INSTRUCTIONS
THERMOSTATIC WATER MIXING VALVE SYSTEM
TM-500A, TM-500A-LF, TM-550A
IMPORTANT! Provide valve serial number (located on valve body) when ordering parts!!
Starting with TM551A, TM552A, TM553A, …..
Compliance…………ANSI Z 358-1
°C
°F
THERMOMETER
HOT
INLET
CHECKSTOPS
COLD
INLET
TM-500A, TM-500A-LF TM-550A
INLINE
CHECK
REDUNDANT
THERMOSTATIC
MIXING VALVE
°C
°F
HOT
INLET
ASSE
1017
OUTLET
COLD
INLET
PRIMARY THERMOSTATIC
MIXING VALVE
INSTALLATION
1. Valve should be installed at a location where it can easily be
cleaned, adjusted or repaired.
2. The inlets are clearly marked on the valve body casting.
Connect the hot water into the inlet marked "HOT" and cold
water into the inlet marked "COLD." These are NOT to be
confused with the "C-H" markings on the front cover.
3. Use solder or pipe cement sparingly. Supply pipes should be
flushed before the valve is connected. Flush outlet pipe and
valve as soon as it is connected.
Maximum Operating Pressure 125PSI (860 KPA) for Hot
and Cold Water.
NOTE: TM-500Aand TM-550A are designed for multiple face/eye washes and not to be
used for drench shower applications.
CAUTION
IMPORTANT! These systems are designed to provide mixed water from 60 to 90°F (15 to 32°C) for
eye/face wash applications only. Call Leonard for systems designed to operate at temperatures outside of
this range.
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 valve.
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 valve.
TO RESET ADJUSTABLE HIGH TEMPERATURE LIMIT STOP:
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.
WARNING
WARNING! This Thermostatic Mixing Valve has an adjustable high
temperature limit stop, which must be checked. If temperature is too high,
the installer MUST RESET this stop immediately. Always check the
temperature of the mixed water when the lever handle is turned to full
HOT. Excessively hot water is DANGEROUS AND MAY CAUSE
SCALDING!
The high temperature limit stop is factory set at approximately 90°F
(32°C) with an incoming hot water supply temperature of 135°F (57°C).
If the incoming hot water on the job is higher than 135°F (57°C), the
valve when turned to full hot will deliver water in excess of 90°F (32°C)
and the high temperature limit stop MUST BE RESET BY THE
INSTALLER.
TROUBLESHOOTING INSTRUCTIONS
PACKINGS &
GASKETS 1. Leak at pointer rod.
2. Leak between valve cover and base.
PARTS REQUIRED:
KIT# 1/26 (PACKINGS & GASKETS)
PORT SLEEVE
ASSEMBLY 3. Valve delivers all cold water, or will not mix consistently. KIT# R/25M (REBUILDING KIT)
OR TM25M-1-8B BRIDGE ASSEMBLY
THERMOSTAT
GROUP 4. After cleaning or replacing port sleeve assembly, valve
will not hold temperature. KIT# R/25M (REBUILDING KIT)
OR TM25M-G2 THERMOSTAT GROUP
CHECKSTOPS 5. Hot water bypass into cold line. 6. Supplies cannot be shut off completely.
7. Leak at checkstop bonnet. KIT# 4/M20 (CHECKSTOP KIT)
SEE PAGE 5 FOR COMPLETE PARTS BREAKDOWN, PARTS KITS
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 6).
If installed on a circulated hot water system, make certain the valve is piped according to Leonard Required Methods of
Piping (see page 3).
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

REQUIRED METHOD OF PIPING TM VALVE
METHOD #1
Required when hot water is to be circulated to a thermostatic mixing valve, which is a substantial distance from
the hot water source.
TM-500A TM-550A
ADJUSTMENT
SCREW
The TM-550 Redundant Thermostatic Mixing Valve has
been factory set at 90°F (32°C). This set point can be field
adjusted with a 3/8” wrench (see diagram). ”Clockwise”
direction will increase temperature. Maximum set point is
100°F (38°C).
REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE CLEANED
AND MAINTAINED ON A REGULAR BASIS. (SEE MAINTENANCE GUIDE
AND RECORD, MGR-1000).
This unit must be cycled each time the emergency equipment is checked. See ANSI Z358.1, Maintenance and Training
section:
1. Cycle redundant thermostatic valve by loosening the
pointer set screw and setting the primary thermostatic
mixing valve to full hot. (TM-550 only)
2. Open eye/face wash and allow temperature to reach
the set point.
3. Turn primary thermostatic valve to full cold and wait
ten seconds.
4. Turn primary thermostatic valve to full hot and wait
for ten seconds.
5. Check to be sure outlet temperature does not climb
above 90°F (32°C)
6. Turn primary thermostatic mixing valve to full cold
and wait ten seconds.
7. Set primary thermostatic mixing valve to the desired
temperature and close eye/face wash.
3
°C
°F
OUTLET
CIRCULATE HOT WATER FROM END OF LINE BACK TO TANK
(THIS PIPING IS NOT TO BE USED FOR AN ENTIRE BUILDING!)
INLET
HOT
COLD SUPPLY
HOT SUPPLY
INLET
COLD
THERMOSTATIC
MIXING VALVE
ASSE
1017
PRIMARY THERMOSTATIC
SECONDARY
MIXING VALVE
THERMOSTATIC
COLD SUPPLY
HOT SUPPLY
CIRCULATE HOT WATER FROM END OF LINE BACK TO TANK
(THIS PIPING IS NOT TO BE USED FOR AN ENTIRE BUILDING!)
MIXING VALVE
HOT
INLET OUTLET INLET
COLD
°C
°F

To replace entire Thermostatic Control
P.S. HOLDER NUT
P.S. HOLDER
HOLDER NUT O'RING
P.S. PACKING
PORT SLEEVE
327 (HOT SIDE)
TM-25-3A
TGM-1/25M
TM-25-3B
TM-28-6B
ASSEMBLY
TM-25M-1-8B
BRIDGE ASSY
MU-10B
POINTER ROD NUT
TM-25-5
BRIDGE
Assembly specify TM-25M-1-12B
(2 REQ'D)
(2 REQ'D)
(COLD SIDE)
GASKET
M20-3C
COVER
TM-28-6B
HOLDER NUT O'RING
1.
2.
3.
4.
M20-2C
COVER
SCREWS
(HOT SIDE)
329 PACKING
P.S. HOLDER
TM25-3
NOTE: AFTER INSTALLING NEW PARTS IT WILL BE NECESSARY TO RESET THE ADJUSTABLE HIGH
TEMPERATURE LIMIT STOP (SEE PAGE 2).
REMEMBER: THIS IS A CONTROL DEVICE, WHICH MUST BE CLEANED ON A REGULAR BASIS (SEE
MAINTENANCE GUIDE AND RECORD, MGR-1001).
4
57-D
COVER
GASKET
POINTER ROD NUT
GLAND PACKING (2 REQD)
GLAND NUT
THERMO GROUP
M20-3C
MU-10B
M20-4C
COVER
M20-1C
TM25M-G2
INSTRUCTIONS FOR DISMANTLING VALVE (DWG. 1)
1. Shut off hot and cold supplies to valve.
2.Remove four Cover Screws M-20-2C to release entire thermostatic control assembly.
WHEN RE-ASSEMBLING VALVE, insert Cover Gasket M-20-3C in base. Lubricate TM-
28-6B O'Rings before re-inserting assembly.
After installing new parts, it will probably be necessary to reset high temperature limit. See
instructions "TO RESET ADJUSTABLE HIGH TEMPERATURE LIMIT STOP" (page 2).
TO REMOVE BRIDGE ASSEMBLY (DWG. 2)
Remove MU-10B Pointer Rod Nut, remove TM25M-1-8B Bridge Assembly from pointer rod.
Failure to properly blend the water may be caused by a sticking condition in the TGM-1/25M
Port Sleeve Assembly. The Thimble should slide freely on the Port Sleeve.
Clean with a NON-CORROSIVE CLEANING AGENT AND SOFT CLOTH. DO NOT USE
ABRASIVES, then wash parts thoroughly.
To reassemble, replace Bridge Assembly on pointer rod. Driving ball on Thimble MUST
engage hole in coil bracket. Replace pointer rod nut.
DO NOT apply grease or lubricants to the TGM-1/25M Port Sleeve Assembly.
TO DISASSEMBLE BRIDGE ASSEMBLY (DWG. 3)
Remove TM25-3A Holder Nuts using a screwdriver in the slots provided. Clean or replace
TGM-1/25M Port Sleeve Assembly following instructions above. When reassembling, check
TM25-3B port sleeve packings and replace if necessary.
TO CLEAN OR REPLACE THERMOSTAT GROUP
Remove stop retaining ring and stop. Loosen gland nut. Push rod through cover. BE
CAREFUL NOT TO PULL THERMOSTAT COIL OUT OF SHAPE.
To clean, if a deposit has collected on the thermostat group, brush in a non-corrosive cleaning
solution. Rinse in clean water and replace in cover with parts as shown.

TM-500A, 550AVALVE PARTS
TO CLEAN THERMOSTAT GROUP
Push rod through cover. Be careful not to pull
coil out of shape. If a deposit has collected on
the thermostat group (TM25M-G2) brush in a
non-corrosive cleaning solution.
REMEMBER! THIS IS A CONTROL 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).
5
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/CP
MU-4A RF/CP
CHECKSTOP PARTS
& PKG. (2 EACH)
KIT R/25M REBUILDING KIT
KIT 4/M20 CHECKSTOP KIT
KIT 1/26 PACKINGS & GASKETS
LOWER STEM
O'RING (2 EACH)
HOLDER NUT
LOWER STEM
& PACKING
BONNET PKG.
2 EACH:
M20-6A
(2 EACH)
GLAND PKG.
M20-3A
(2 EACH)
MU-4C
STEM O'RING
MU-5A UPPER
GASKET
M20-3C
COVER
M20-3A
BONNET PKG.
(2 EACH)
O'RING
MU-5A
M20-6A
TM-28-6B
CHECK SPRING
CHECK SPRING
M20-9A
M20-9A
(2 EACH)
M20-3C
COVER
GASKET
TM-25M-1-12B
THERMOSTATIC
CONTROL ASSEMBLY
COVER
GASKET
POINTER ROD NUT
GLAND PACKING
GLAND NUT
THERMOSTAT GROUP
M20-3C
MU-10B
MU-4C
TM25M-G2
57-D
(2 REQ'D)
P.S. HOLDER NUT P.S. HOLDER
HOLDER NUT O'RING
P.S. PACKING (COLD SIDE)
PORT SLEEVE
327 (HOT SIDE)
TM-25-3A
TGM-1/25M
TM25-3B
TM-28-6B ASSEMBLY
TM25-5
BRIDGE
(2 REQ'D)
(2 REQ'D)
BRIDGE ASSEMBLY
TM25M-1-8B
M20-1C
COVER
7628
7520
6910
POINTER
POINTER SCREW
LTR SET SCREW COVER SCREWS (4 REQD)
M20-2C
P.S. HOLDER
TM25-3 (COLD SIDE)
P.S. PACKING (HOT SIDE)
329

© 2018 Leonard Valve Company
Printed in USA
FLOW CAPACITIES
MAXIMUM FLOW CAPACITY GALLONS PER MINUTE
PRESSURE DROP P.S.I.G.
10
0
20
30
40
55
50
234567
TM-500A/550A
30810 20 6040 50 70 80 100 150 200
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 and DO NOT OVERSIZE. Minimum flow must be no less than shown below.
IMPORTANT! These systems are designed to provide mixed water from 60 to 90°F (15 to 32°C) for face/eyewash
applications only, these systems are not designed for drench shower applications. Call Leonard for systems designed to
operate at temperatures outside of this range.
TM-500A
SYSTEM PRESSURE DROP
3/4" 3/4" 11
L\MIN
3.0
.7
9
34
MAXIMUM FLOW CAPACITY
30
MINIMUM
8
26
.3
7
45
12
1.0
49 61
13
1.4
16
1.7
MODEL IN OUT FLOW
MINIMUM
(GPM) 10
INTERNAL
BY-PASS
COLD WATER 515 20 25
3.12.4
20
76
68
18
2.1
83
2.8
22
L\MIN
GPM
BAR
91
24
4530 35 40 PSI 50
3.4
26
98
3/4" 3/4" 3.0
11
7
26
30
8
49
13
L\MIN
22
8368 76 61
16 18 20
9891
24 26 GPM
9
34
12
45
TM-550A
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.
1360 Elmwood Avenue, Cranston, RI 02910 USA
Phone: [phone] Fax: [phone]
Email: [email protected]
Web Site: http://www.leonardvalve.com
6