Leonard TM-500A, TM-550A, TM-500A-LF Installation And Operating Instructions For The Installer

BULLETIN G-6B

August, 2018

INSTALLATION SETUP AND 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

HOT

INLET

OUTLET

°C
°F

ASSE
1017

PRIMARY THERMOSTATIC

MIXING VALVE

HOT

INLET

THERMOMETER

°C
°F

CHECKSTOPS

COLD

INLET

TM-500A, TM-500A-LF TM-550A

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

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.

COLD

INLET

REDUNDANT
THERMOSTATIC
MIXING VALVE

INLINE
CHECK

NOTE: TM-500Aand TM-550A are designed for multiple face/eye washes and not to be

used for drench shower applications.

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).

CAUTION

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 valve.

TO RESET ADJUSTABLE HIGH TEMPERATURE LIMIT STOP:

FINE

POINTER SCREW

POINTER

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, loosenforhotter 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.

ADJUSTMENT

SCREW

(REST STOP AGAINST SCREW)

LTR

SET SCREW

COLD HOT

ASSE
1017

WEB

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.

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 s top MUST BE RESET BY THE

INSTALLER.

TROUBLESHOOTING INSTRUCTIONS

PARTS REQUIRED:

PACKINGS &
GASKETS

PORT SLEEVE
ASSEMBLY

THERMOSTAT
GROUP

1. Leak at pointer rod.

2. Leak between valve cover and base.

3. Valve delivers all cold water, or will not mix
consistently.

4. After cleaning or replacing port sleeve assembly, valve
will not hold temperature.

KIT# 1/26 (PACKINGS & GASKETS)

KIT# R/25M (REBUILDING KIT)
OR TM25M-1-8B BRIDGE ASSEMBLY

KIT# R/25M (REBUILDING KIT)
OR TM25M-G2 THERMOSTAT GROUP

5. Hot water bypass into cold line.

CHECKSTOPS

6. Supplies cannot be shut off completely.

KIT# 4/M20 (CHECKSTOP KIT)

7. Leak at checkstop bonnet.

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

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.

(THIS PIPING IS NOT TO BE USED FOR AN ENTIRE BUILDING!)

OUTLET

°C
°F

THERMOSTATIC

MIXING VALVE

CIRCULATE HOT WATER FROM END OF LINE BACK TO TANK

COLD SUPPLY

HOT SUPPLY

HOT

INLET

OUTLET

COLD
INLET

HOT

INLET

(THIS PIPING IS NOT TO BE USED FOR AN ENTIRE BUILDING!)

CIRCULATE HOT WATER FROM END OF LINE BACK TO TANK

COLD
INLET

HOT SUPPLY

COLD SUPPLY

°C
°F

ASSE
1017

PRIMARY THERMOSTATIC

SECONDARY

THERMOSTATIC

MIXING VALVE

MIXING VALVE

TM-500A TM-550A

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

ADJUSTMENT

100°F (38°C).

SCREW

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/fac e wash.

3

INSTRUCTIONS FOR DISMANTLING VALVE (DWG. 1)

1. Shut off hot and cold supplies to valve.

2.Remove four Cover ScrewsM-20-2C to release entire thermostatic control assembly.

WHEN RE-ASSEMBLING VAL VE, insert Cover Gasket M-20-3C in base. Lubricate TM­28-6B O'Rings before re-insertingassembly.

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 shouldslidefreely on the Port Sleeve.

Clean with a NON-CORROSIVE CLEANING AGENT AND SOFT CLOTH. DO NOT USE
ABRASIVES, then wash parts thoroughly.

1.

TM-28-6B

HOLDER NUT O'RING

2.

TM-25M-1-8B

BRIDGE ASSY

M20-2C
COVER

SCREWS

M20-3C
COVER

GASKET

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.

57-D

GLAND NUT

M20-3C
COVER

GASKET

MU-10B

POINTER ROD NUT

M20-1C
COVER

M20-4C

GLAND PACKING (2 REQD)

POINTER ROD NUT

3.

TM-25-3A

P.S. HOLDER NUT

(2 REQ'D)

TM-28-6B

HOLDER NUT O'RING

(2 REQ'D)

TM-25-5
BRIDGE

P.S. HOLDER

4.

To replace entire Thermostatic Control

Assembly specif y TM-25M-1-12B

MU-10B

TM25-3

327 (HOT SIDE)

P.S. HOLDER

329 PACKING

TGM-1/25M

PORT SLEEVE

ASSEMBLY

TM-25-3B

P.S. PACKING

(COLD SIDE)

(HOT SIDE)

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).

TM25M-G2

THERMO GROUP

4

TM-500A, 550A VALVE PARTS

LTR SET SCREW

6910

POINTER SCREW

7520

7628

POINTER

TM25M-1-8B

BRIDGE ASSEMBLY

CHECKSTOP PARTS

57-D

GLAND NUT

MU-4C

GLAND PACKING

(2 REQ'D)

M20-1C
COVER

TM-25-3A

P.S. HOLDER NUT

(2 REQ'D)

TM-28-6B

HOLDER NUT O'RING

(2 REQ'D)

TM25-5

BRIDGE

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.

M20-3C
COVER

GASKET

TM25M-G2

THERMOSTAT GROUP

327 (HOT SIDE)

P.S. HOLDER

TM25-3 (COLD SIDE)

P.S. HOLDER

P.S. PACKING (COLD SIDE)

P.S. PACKING (HOT SIDE )

M20-2C

COVER SCREWS (4 REQD)

MU-10B

POINTER ROD NUT

TGM-1/25M

PORT SLEEVE

ASSEMBLY

TM25-3B

329

MU-4A RF/CP

UPPER STEM

M20-9A

AND PACKING

M20-2A RF/CP

CHECK BONNET

MU-5A UPPER

STEM PKG.

CHECKSTOPS

M20-3A BONNET

PACKING

M20-6A LOWER

STEM & PACKING

CHECK SPRING

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).

KIT 1/26 PACKINGS & GASKETS

MU-4C

GLAND PKG.

(2 EACH)

M20-3A

BONNET PKG.

(2 EACH)

M20-3C
COVER

GASKET

M20-9A

(2 EACH)

CHECK SPRING

TM-28-6B

HOLDER NUT

O'RING (2 EACH)

KIT R/25M 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

M20-6A

LOWER STEM

& PKG. (2 EACH)

MU-5A

O'RING

(2 EACH)

TM-25M-1-12B

THERMOSTATIC

CONTROL ASSEMBLY

M20-3A

BONNET PKG.

5

FLOW CAPACITIES

55

50

40

30

20

PRESSURE DROP P.S.I.G.

10

0

234567

MAXIMUM FLOW CAPACITY GALLONS PER MINUTE

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/550A

30810 20 6040 50 70 80 100 150 200

MODEL

TM-500A

TM-550A

IN

OUT

3/4" 3/4"

3/4" 3/4"

MINIMUM

FLOW
(GPM)

L\MIN

3.0
11

3.0
11

INTERNAL

COLD WATER

BY-PASS

MINIMUM

8

30

8

30

MAXIMUM FLOW CAPACITY

5

.3

7

26

7

26

SYSTEM PRESSURE DROP

10

15 20 25

.7

1.0

1.4161.7

9

12

13

34

45

49 61

93412

45

13
49

16 18
61

2.1

18
68

20
76

20
76

2.8

22
83

22
8368

4530 35 40

3.12.4
24

91

24 26

50

3.4
26

98

9891

PSI
BAR

GPM

L\MIN

GPM

L\MIN

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.

© 2018 Leonard Valve Company
Printed in USA

1360 Elmwood Avenue, Cranston, RI 02910 USA

6

Phone: [phone] Fax: [phone]

Email: [e-mail]

Web Site: http://www.leonardvalve.com