Leonard MEGATRON 270, MEGATRON 370, MEGATRON 270-LF, MEGATRON 370-LF Installation Adjustment Service

MEGATRON®MODEL 270/370

MODEL 270-LF, 370-370-LF

SYSTEMS

WARNING: This product can expose you to

chemicals including lead, which is known to the State

!

OUTLET

of California to cause cancer. For more information, go
to www.P65Warnings.Ca.gov

Bulletin M-270/370

August, 2018

TEST/SETUP
CONNECTION

0

4

2
0

INLET

8
0

0

6

20

30

10

R

LEONARD

0

-10
60

°C
°F

0

4
1

HOT

8

0

0

6

20

1

30

0
0

0

10

4

R

LEONARD

40

0

50

-10

2

0

0

2
1

60

°C
°F

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0
4

1

1
0
0

40

50

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1

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2
0

COLD
INLET

INSTALLATION

1. Megatron 270/370 systems is factory pre-assembled and
tested System should be installed at a location where it can
easily be cleaned,adjusted or repaired.

2. System supplies must be connected as shown (Hot-left,
Cold-right). Exercise caution when soldering.

RETURN LINE

8

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6

20

1

30

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10

4

R

8

0

0

6

20

1

30

0
0

10

R

LEONARD

40

0

50

-10

0
2
1

60

°C
°F

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0
4

1

LEONARD

40

0

50

-10

2

0

0

2
1

60

°C
°F

0

0

4

1

TO HOT

WATER SOURCE

4. Flush pipes thoroughly after system has been connected.

5. Refer to page 4 of this bulletin for correct Setup
Instructions.

NOTE: NOT TO BE USED FOR

EYEWASH APPLICATIONS

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 4.

1360 Elmwood Avenue, Cranston, RI 02910 USA

Phone: [phone] Fax: [phone]

Email: [e-mail]

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

ADJUSTMENT AND SER VICE

TEMPERA TURE ADJUSTMENT

WARNING

WARNING! This thermostatic mixing valve’s

temperature setting MUST be checked. If the
temperature is too high (above 110ºF, 43ºC), the
temperature knob must be adjusted immediately.
Excessively hot water is DANGEROUS AND MAY

1. Open hot and cold water supply valves to mixing valve.

2. Open mixed water outlet.

3. With the fixture in the full open position, calibrate the
mixed water outlet temperature by placing a thermometer
in the mixed water stream. Loosen knob set screw with
5/64” allen wrench. Adjust the setting of the valve to
obtain the desired temperature (counterclockwise, to
increase temperature-clockwise to decrease temperature.)

4. Tighten knob set screw to lock temperature setting.

CAUSE SCALDING!!

PRESSURE-TEMPERATURE:

 Minimum Flow:0.5 GPM (1.9 l/Min)
 Maximum Pressure:125 PSI (8.6 BAR)
 Maximum Hot Water temperature: 200F- (93°C)
 Approach Temperature 5°F (2.8°C) above set

point.

TROUBLESHOOTING INSTRUCTIONS

GASKET KIT Leaking water under knob.

Leaking water between valve cover and body.

REBUILDING KIT Valve will not control temperature after

cleaning.

CHECKSTOP KIT Hot water by-pass into cold line.

Cold water by-pass into hot line.

SEE PAGE 3 FOR COMPLETE PARTS BREAKDOWN

SEE PAGE 4 FOR PIPING IN RECIRCULATED OR NON-RECIRCULATED WATER SYSTEMS

MODEL

270

370

IN OUT

1/2" 1/2"

3/4" 3/4"

MINIMUM

FLOW
(GPM)

L\MIN

0.5

1.96415 23

5

.3

3.50.25 5.5

10

.7

210.95 13

15 20 25

6.5 7.5 8.5

27 30934

PRESSURE DROP

87

GASKET KIT
Model 270 1/WX
Model 370 1/WX

REBUILDING KIT
Model 270 R/270/370
Model 370 R/270/370

CHECK KIT
Model 270 4/220
Model 370 4/320

3.4

PSI

50

BAR
GPM

12
45

L\MIN

GPM

13
49

L\MIN

30

35 40 45

2.1

1.71.0 1.4

9.5
36

3225 28

10
38

2.82.4 3.1

10.510

11.5

4038 43

11.510.5

12.5

40 43 47

IMPORTANT!! THIS IS A CONTROL SYSTEM WHICH MUST BE CLEANED AND MAINTAINED ON A
REGULAR BASIS (SEE MAINTENANCE GUIDE AND RECORD MGR-1001).

1360 Elmwood Avenue, Cranston, RI 02910 USA

Phone: [phone] Fax: [phone]

Email: [e-mail]

WEB: http://www.leonardvalve.com 2

VALVE PARTS LIST

CHECK CLIP (MODEL 270/370 ON LY)

RETAINING CLIP

STEM ASSEMBLY O'RING

KNOB

SCREW

DIAL PLATE

K NOB S E T S CREW

MODEL 270, 370

MODEL 270

1/ WX Gasket Kit

Shuttle o’ring
Stem assembly o’ring
Cover o’ring

R/ 270/370 Complete Rebuild Kit

Return spring
Shuttle assembly
Shuttle o’ring
Stem assembly o’ring
Cover o’ring

4/220 Check valve Kit

2 Check valves
2 Check clips

COVER O'RING

STEM ASSEMBLY
DO NO T REMOVE
SNAP RING ON
STEM - INJURY MAY

OCCUR

COVER

1/ WX Gasket Kit

R/ 270/370 Complete Rebuild Kit

4/320 Check valve Kit

CHECK

SHUTTLE ASSEMBLY

RETURN SPRING

SH UTTLE O 'RING

MODEL 370

Shuttle o’ring
Stem assembly o’ring
Cover o’ring

Return spring
Shuttle assembly
Shuttle o’ring
Stem assembly o’ring
Cover o’ring

2 Check valves
2 Check clips

DISMANTLING & CLEANING TROUBLESHOOTING

1. Shut off hot and cold water to the valve as well as the valve
outlet port.

2. Loosen lock screw on side of knob with 5/64” allen wrench.

3. Remove the knob screw on top of knob.

4. Remove temperature adjustment knob.

5. Remove valve cover, which includes the stem assembly.

6. The shuttle assembly can now be removed, cleaned and
inspected. Be sure to check the condition of the shuttle o-ring
and replace if necessary.

7. Lubricate the shuttle o-ring before installing the shuttle
assembly.

8. Install the cover assembly including o-ring back onto valve
and tighten.

9. Replace knob and knob screw.

10. Valve temperature must be reset after any repairs or
cleaning!! See Page 2. Temperature Adjustment

1360 Elmwood Avenue, Cranston, RI 02910 USA

Phone: [phone] Fax: [phone]

Email: [e-mail]

WEB: http://www.leonardvalve.com

1. Leaking water under knob, order gasket kit, replace stem
assembly o-ring. Remove knob screw and knob, remove
retaining clip, thread out the stem assembly and replace o-ring.
Lubricate o-ring, thread stem into cover, replace retaining ring,
knob and screw. Valve temperature must be reset after any

repairs or cleaning!! See page 2.

2. Leaking water between cover and body, order gasket kit,
replace cover o-ring. Remove knob screw and knob and remove
valve cover and replace o-ring. Replace valve cover, knob and
knob screw. Valve temperature must be reset after any

repairs or cleaning!! See page 2.

3. Hot water bypass into cold line, order checkstop kit and replace
checks within inlets of valve.

4. Valve not controlling temperature even after cleaning, order
complete rebuild kit. Remove knob screw and knob and remove
valve cover. Replace shuttle assembly and return spring being
sure to lubricate shuttle o-ring. Replace valve cover, knob and
knob screw. Valve temperature must be reset after any

repairs or cleaning!! See page 2.

3

REQUIRED METHOD OF PIPING

(RECIRCULATED DOMESTIC WATER SYSTEMS)

DOMESTIC TEMPERED

WATER

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LEONARD

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2
1

60

°C
°F

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4
1

8

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6

20

1

30

0
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10

4

LEONARD

8

HOT

WATER

SOURCE

HIGH

TEMP.

WATER

HEAT

TRAP

8

0

0

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6

6

1

20

20

30

30

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10

4

4

LEONARD

LEONARD

40

40

0

0

50

50

-10

-10

2

2

0

0

0

2
1

60

60

°C

°C

°F

°F

0

0

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4

4
1

1

40

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-10

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60

°C
°F

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1

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2
1

BALANCING
VALVE

DOMESTIC

COLD SUPPLY

RECIRCULATED WATER

HIGH TEMPERATURE
RECIRCULATED WATER

THIS PIPING METHOD IS NOT TO BE USED FOR MORE THAN ONE BUILDING

PROCEDURE TO BALANCE RECIRCULA TION SYSTEM

1. ADJUST THE BALANCING VALVE TO FULL OPEN, TURN THE RECIRCULATION PUMP OFF AND FLOW WATER BY
EITHER USING FIXTURES OR BY USING THE TEST CONNECTION.

2. ADJUST THE VALVE HANDLE TO THE APPROPRIATE TEMPERATURE.

3. CLOSE THE FIXTURES AND / OR TEST CONNECTION, TURN ON THE RECIRCULATION PUMP.

4. OBSERVE THE TEMPERATURE, IF THE TEMPERATURE REMAINS AT THE SET POINT SET UP IS COMPLETE. IF THE
TEMPERATURE INCREASES CLOSE DOWN THE BALANCING VALVE SLOWLY UNTIL IT RETURNS TO SET POINT.

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 beyond the 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.

© 2018 Leonard Valve Company

Printed in USA

1360 Elmwood Avenue, Cranston, RI 02910 USA

Phone: [phone] Fax: [phone]

Email: [e-mail]

WEB: http://www.leonardvalve.com

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