Watts 1170, LF1170-M2, 1170-M2, L1170-M2, LFL1170-M2 Installation Instructions
...
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.
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