Watts LFL1170 User Manual

Instructions
Series LF1170 and LFL1170

Hot Water Temperature Control Valves

Size: 1⁄2", 3⁄4", 1"

!

WARNING

Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information

can result in death, serious personal injury, property
damage, or damage to the equipment.

Keep this Manual for future reference.

LF1170-UT-M2

IS-1170-M2_L1170-M2

LF1170-QC-M2

!

WARNING

FAILURE TO COMPLY WITH PROPER INSTALLATION AND
MAINTENANCE INSTRUCTIONS COULD CONTRIBUTE TO THE VALVE
FAILURE.

This Hot Water Master Tempering Valves cannot be used for temper­ing water temperature at fixtures. Severe bodily injury (i.e., scalding
or chilling) and/or death may result depending upon system water
pressure changes and/or supply water temperature changes. ASSE
standard 1016, 1069 or 1070 listed devices should be used at fix­tures to prevent possible injury.

These Hot Water Tempering Valves are designed to be installed at or near
the boiler or water heater. They are not designed to compensate for sys­tem pressure fluctuations and should not be used where ASSE standard
1016, 1069 or 1070 devices are required. These valves should never be
used to provide “anti-scald” or “anti-chill” service.

The components of the system must be of materials with a construction
capable of withstanding the high limit output temperatures of the water
heating source.

!

WARNING

Need for Periodic Inspection and Yearly Maintenance:

Periodic inspection and yearly maintenance by a licensed
contractor is required. Corrosive water conditions, tempera­tures over 200°F, unauthorized adjustments or repair could
render the valve ineffective for service intended. Regular
checking and cleaning of the valve’s internal components and
check stops helps assure maximum life and proper product
function. Frequency of cleaning and inspection depends upon
local water conditions.

!

WARNING

You are required to consult the local building and plumbing
codes prior to installation. If the information in this manual
is not consistent with local building or plumbing codes,
the local codes should be followed. Inquire with governing
authorities for additional local requirements.

Installation

!

WARNING

Valve should be installed and adjusted by a licensed contractor
in accordance with local codes and ordinances. Further, this
valve should be installed in a location where it is accessible for
cleaning, service or adjustment.

1. Close both the hot and cold water shutoff valves upstream
nearest to the intended installation.

2. Bleed the remaining water from the system.

3. Connect the water supply to valve as shown in Figure 1 or 2,
depending on the application. Supply piping must be flushed
clean before making connections to the valve.

NOTICE

To prolong the life of the Model LF1170-M2 or LFL1170-M2
valve, it is recommended that it be trapped as shown (Figure1):
i.e. the hot water inlet to the LF1170-M2 valve should be 8" –
12" (200 – 305mm) below the hot water supply feed.

4. Valve can be installed in any position. Note: the inlet hot sup­ply is to be connected to the “H” side of the valve, the cold
supply side to the “C” side and the mixed water outlet to the
“M” side.

5. Make sure union nuts are placed over tailpieces prior to
soldering or threading to pipe.

6. For valves with Quick-Connect tailpieces refer to “Quick­Connect Installation” instructions below.

NOTICE

To prevent damage to valve from excessive heat during
soldering, remove unions and gaskets from valve body prior to
soldering.

!

WARNING

Use caution when soldering. Protect yourself and others. FUMES
AND GASES can be hazardous to your health. HEAT RAYS (INFRARED
RADIATION) from flame or hot metal can injure eyes.

7. After soldering, flush piping and install valve using filter wash­er on hot and cold water inlet and fiber washer on the mixed
water outlet.

8. Start-up: Open cold water supply, then hot water supply.
Inspect for leaks.

9. Adjust temperature to desired setting (see Temperature
Adjustment Section).

Quick-Connect Installation

To Connect

1

/2 in. (38.1mm)

1

1

/2 in.Pipe (12.7mm)

3

/4 in. (44.45mm)

1

3

/4 in.Pipe (19.05mm)

7

1

/8 in. (47.63mm)

1 in.Pipe (25.4mm)

1. Mark pipe as shown.
This is pipe insertion depth.

PEX tubing only

Tail Piece

3. If using PEX tubing, insert pipe
stiffener (provided) into end of pipe.

Pipe Stiffener

To Disconnect

2. Clean pipe end.

4. Push tubing into tailpiece up to mark.

5. Insert collet clip.

Collet clip

Mark

Figure 2

Radiant Heat Application

from Boiler

Watts Flow
Check

Watts
Ball Valve

TP

LF1170-M2,
LFL1170-M2

Test Plug

RPV

CV, CVS

Check Valve

to Boiler

Figure 3

Temperature Adjustment

Factory Preset:

LF1170-M2: 120°F (49°C)
LFL1170-M2: 90°F (31°C)

Under following conditions:

Cold Inlet: 60-70°F (16-21°C)
Hot Inlet: 140-145°F (60-63°C)
Supply Pressure: 45psi (3.15 bar)

Watts
Ball Valve

Circulator

Mixed

to Radiant

Cold

Radiant Return

1. Remove collet clip.

2. Depress collet.

3. Pull tubing from tailpiece.

Figure 1

Domestic Hot Water Application

Watts

Vacuum Relief

Valve

Watts T&P
Relief Valve

Cold

Cold

Domestic Hot Water Application

Hot to

Appliances

Hot

H
C

Collet depressed

Watts

Temperature

Gauge

M

LF1170-M2 or

LFL1170-M2

Cold

Tempered †

*8" – 12"

Turn

Hotter

Colder

Unscrew, lift

3

/32" Hex Wrench

cap to adjust

1. Let water flow for at least two minutes to allow supply tem­perature to stabilize.

2. Calibrate the mixed water outlet temperature by placing a
thermometer in the mixed water stream.

3. To adjust the setting of the valve, loosen locking cap screw
with hex wrench, see Figure 3. Cap must be lifted 1/4" to
adjust temperature. To increase the temperature, turn coun­terclockwise. To decrease temperature turn clockwise.

4. Lower handle and tighten screw.

5. Check outlet temperature.

NOTICE

To prolong the life of the valve, it is recommended the valve
be trapped as shown

† Devices tested to ASSE 1016, ASSE 1070 or ASSE 1069

such as Watts LFUSG, LFL111 or LFMMV should be used
at fixture to prevent possible injury.

Period Inspection/Maintenance

This valve requires periodic inspection and verification of the out­let temperature by a licensed contractor. Corrosive water condi­tions, hot inlet water temperature over 200°F (93°C), unauthor­ized adjustments or repairs could render the valve ineffective for
its intended service. Regular cleaning and checking of thermo­stat assembly helps to maximize valve life and mixing function.
Frequency of cleaning depends on local water conditions.

Troubleshooting Guide

Series LF1170-M2 and LFL1170-M2

Pressure — Temperature

Minimum Supply Pressure (Static): 30psi (207 kPa)

Inlet Temperatures: hot inlet, 120°F – 200°F (49°C – 93°C),

Hot Water Inlet to Outlet Differential Temperature: 5°F (3°C)

LF1170-M2 Temperature Out:

Field range: 90°F – 160°F (32°C – 71°C), adjustable.

Accurate within ±3°F (1.7°C)

LFL1170-M2 Temperature Out:
Field range: 60°F – 120°F (16°C – 49°C), adjustable.

Accurate within ±3°F (1.7°C)

Maximum Temperature: 200°F (93°C)

Maximum Pressure: 150psi (10.3 bar)

Maximum Pressure Differential Between Hot and Cold
Water Supplies:

Approval: CSA B125 certified
Listing: ASSE 1017 and IAPMO UPC

cold inlet, 40°F – 85°F (4°C – 29°C)

25%.

Symptom Cause Solution

Unable to reach required set point or set
point difficult to set

Unable to achieve required flow 1. Too much pressure drop at fixture

Valve does not maintain required temper
ature or temperature changes over time

Discharge temperature too hot or cold 1. Valve not calibrated properly 1. Readjust valve temperature per installation

Hot water from cold water tap or cold
from hot

Valve is noisy 1. Water velocity is too high

No flow from valve 1. Hot or cold water supply failure or shutoffs

Flow from valve fluctuates 1. Fluctuation in supply pressures

1. Supply temperatures not within specified
limits

2. Hot and cold supplies reversed

3. Filters are blocked by debris

2. Checks valve/filters blocked by debris

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1. Fluctuation in supply pressures

2. Check valve/filters blocked by debris

3. Recirculation loop not piped properly

1. Check valves fouled 1. Clean check valves/filters

2. Valve not sized properly

closed

2. Check valve/filters blocked by debris

2. Check valve/filters blocked by debris

1. Check differential temperature between hot
and cold supplies and outlet 10°F (5.6°C)
minimum required

2. Reinstall valve with supplies connected to

marked inlets

3. Clean filters

1. Measure supply pressures and check
against flow chart. Look for restrictions in
valve or piping

2. Clean check valves/filters

1. Stabilize water pressures with pressure
regulating or balancing valves

2. Clean check valves/filters

3. Pipe recirculated tempered water return so
it connects to hot water source and cold
side of mixing valve (see Product Guide for
piping details)

instructions

1. Reduce water velocity with pressure
regulating valves

2. Check flow required versus rated flow
capacity of valve

1. Open shutoffs or restore hot and cold sup
ply

2. Clean check valves and filters

1. Stabilize water pressure with pressure regu
lating valves

2. Clean check valves and filters

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ATTENTION INSTALLER: After installation, please leave this

WARNING

!

Instruction Sheet for occupant’s information.

For valves with CPVC or PEX end connections, do not exceed the
tubing manufacturers pressure and temperature ratings. Refer to the
tubing manufacturers product specications for that information.

Limited Warranty: Watts Regulator Co. (the “Company”) warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of
original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge.

THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER
WARRANTIES, EXPRESS OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special
or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting
from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the Company has no
control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product.
Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above
limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to
determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL SHIPMENT.

A Watts Water Technologies Company

USA: Tel: [phone] • Fax: [phone] • www.watts.com

Canada: Tel: [phone] • Fax: [phone] • www.watts.ca

WARNING: This product contains chemicals known
to the State of California to cause cancer and birth
defects or other reproductive harm.

For more information: www.watts.com/prop65

IS-1170-M2_L1170-M2 1325 EDP# 1915905 © 2013 Watts