IS-1170-M2_L1170-M2
Series 1170, LF1170, L1170 and LFL1170
Hot Water Temperature Control Valves
Size: 1⁄2", 3⁄4", 1" (15, 20, 25mm)
Installation Instructions
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.
IMPORTANT!: To prolong the life of the Model 1170-M2, L1170-M2, LF1170-M2 or
LFL1170-M2 valve, it is recommended that it be trapped as shown: i.e. the hot water
inlet to the 1170-M2 or 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 “Quick-
Quick-Connect Installation
To Connect
Connect Installation” instructions below.
Note: To prevent damage to valve from excessive heat during
soldering, remove unions and gaskets from valve body prior to
soldering.
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.
3
/4 in. (44.45mm)
1
3
/4 in.Pipe (19.05mm)
7
1
/8 in. (47.63mm)
1 in.Pipe (25.4mm)
Inspect for leaks.
9. Adjust temperature to desired setting (see Temperature
Adjustment Section).
1. Mark pipe as shown.
This is pipe insertion depth.
PEX tubing only
Figure 1
1
/2 in. (38.1mm)
1
1
/2 in.Pipe (12.7mm)
1170-QC-M2
LF1170-UT-M2
2. Clean pipe end.
Collet clip
Domestic Hot Water Application
Watts
Vacuum Relief
Valve
Cold
Watts T&P
Relief Valve
*Note: To prolong the life of the valve, it is recommended the
valve be trapped as shown
† Devices tested to ASSE 1070 or ASSE 1069 such as Watts
USG, LFUSG, L111, MMV or LFMMV should be used at
fixture to prevent possible injury.
Cold
Domestic Hot Water Application
Hot to
Appliances
Watts
Temperature
Gauge
Tempered †
Hot
H
M
C
1170-M2, L1170-M2
LF1170-M2 or LFL1170-M2
Cold
*8" – 12"
Tail Piece
3. If using PEX tubing, insert pipe
stiffener (provided) into end of pipe.
Pipe Stiffener
To Disconnect
1. Remove collet clip.
Mark
4. Push tubing into tailpiece up to mark.
5. Insert collet clip.
Collet depressed
2. Depress collet.
3. Pull tubing from tailpiece.
Figure 2
Radiant Heat Application
from Boiler
to Boiler
Watts Flow
Check
1170-M2,
L1170-M2
Check Valve
Watts
Ball Valve
Circulator
TP
Test Plug
RPV
CV, CVS
Figure 3
Temperature Adjustment
Factory Preset:
1170-M2, LF1170-M2: 120°F (49°C)
L1170-M2, 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
Mixed
to Radiant
Cold
Radiant Return
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.
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)
1170-M2, LF1170-M2 Temperature Out:
Field range: 90°F – 160°F (32°C – 71°C), adjustable.
Accurate within ±3°F (1.7°C)
L1170-M2 and 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%.
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.
WARNING
!
Watts Hot Water Temperature Control 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.
ASSE Standard 1016, ASSE 1070 listed devices such as Watts Model L111,
LFL111 Series USG, LFUSG, MMV or LFMMV should be used at fixtures
to prevent possible injury. The Watts Hot Water Temperature Control 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 1016 devices are required. These WATTS valves should never
be used to provide “anti-scald” or “anti-chill” service.
When installing the Series 1170-M2 valves in a radiant heat application, the
components of the radiant heat system must be of materials with a construction
capable of withstanding the high limit output temperatures of the heating boiler.
If you are uncertain as to the product’s adaptability for your application, please
consult an authorized representative before installing or using the product.
Watts 1170-M2, LF1170-M2, L1170-M2, LFL1170-M2
Troubleshooting Guide
Problem & Cause
A. Unable to reach required set point or set point difficult to set
A.1 Supply temperatures not within specified limits
A.2 Hot and cold supplies reversed
A.3 Filters are blocked by debris
B. Unable to achieve required flow
B.1 Too much pressure drop at fixture
B.2 Checks valve/filters blocked by debris
C. Valve does not maintain required temperature or temperature
changes over time
C.1 Fluctuation in supply pressures
C.2 Check valve/filters blocked by debris
C.3 Recirculation loop not piped properly
D. Discharge temperature too hot or cold
D.1 Valve not calibrated properly
Answer
A.1 Check differential temperature between hot and cold supplies and
outlet 10°F (5.6°C) minimum required
A.2 Reinstall valve with supplies connected to marked inlets
A.3 Clean filters
B.1 Measure supply pressures and check against flow chart. Look for
restrictions in valve or piping
B.2 Clean check valves/filters
C.1 Stabilize water pressures with pressure regulating or
balancing valves
C.2 Clean check valves/filters
C.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)
D.1 Readjust valve temperature per installation instructions
E. Hot water from cold water tap or cold from hot
E.1 Check valves fouled
F. Valve is noisy
F.1 Water velocity is too high
F.2 Valve not sized properly
G. No flow from valve
G.1 Hot or cold water supply failure or shutoffs closed
G.2 Check valve/filters blocked by debris
H. Flow from valve fluctuates
H.1 Fluctuation in supply pressures
H.2 Check valve/filters blocked by debris
E.1 Clean check valves/filters
F.1 Reduce water velocity with pressure regulating valves
F.2 Check flow required versus rated flow capacity of valve
G.1 Open shutoffs or restore hot and cold supply
G.2 Clean check valves and filters
H.1 Stabilize water pressure with pressure regulating valves
H.2 Clean check valves and filters
ATTENTION INSTALLER: After installation, please leave this
Instruction Sheet for occupant’s information.
IMPORTANT: Inquire with governing authorities for local
installation requirements.
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
IS-1170-M2_L1170-M2 1004 EDP# 1915905 © 2010 Watts
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
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