Watts MMV Series User manual

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, 2 or 3 depending on appli-
cation. Supply piping must be flushed clean before making connections to the valve.
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-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.
Inspect for leaks.
9.
Adjust temperature to desired setting (see Temperature
Adjustment Section). Watts recommends a maximum
temperature of 110°F (43°C) for shower and bathing fixtures.
Series MMV and LFMMV
Thermostatic Tempering Valves
Sizes: 1⁄2", 3⁄4", 1" (15, 20, 25mm)
IS-MMV-M1
LFMMV-UT-M1
MMV-QC-M1
Quick-Connect Installation
1. Mark pipe as shown.
This is pipe insertion depth.
2. Clean pipe end.
1. Remove collet clip. 2. Depress collet.
3. Pull tubing from tailpiece.
3. If using PEX tubing, insert pipe
stiffener (provided) into end of pipe. 4. Push tubing into tailpiece up to mark.
5. Insert collet clip.
To Connect
To Disconnect
PEX tubing only
Pipe Stiffener
Tail Piece
Mark
Collet clip
Collet depressed
11/2in. (38.1mm)
13/4in. (44.45mm)
17/8in. (47.63mm)
1/2in.Pipe (12.7mm)
3/4in.Pipe (19.05mm)
1 in.Pipe (25.4mm)
Figure 1 – Typical ASSE 1069 Application
Typical MMV-M1 and LFMMV-M1 Applications
Cold
Hot
MMV-M1 or
LFMMV-M1
Mixed
Triple Listed!
ASSE 1017,
ASSE 1069 & ASSE 1070

Period Inspection/Maintenance
This valve requires periodic inspection and verification of the out-
let temperature by a licensed contractor. Corrosive water condi-
tions, hot inlet water temperature over 200°F (93°C), unauthor-
ized adjustments or repairs could render the valve ineffective for
its intended service. Regular cleaning and checking of thermo-
stat assembly helps to maximize valve life and Tempering func-
tion. Frequency of cleaning depends on local water conditions.
NOTE: It is recommended that shutoff valve(s) be installed on
the inlet(s) to facilitate service of the MMV-M1 or LFMMV-M1
valve.
Pressure –– Temperature –– Flow Rate
Minimum Supply Pressure Static: 30psi (207 kPa)
Inlet Temperatures: hot inlet, 120°F – 180°F (49°C – 82°C),
cold inlet, 39°F – 85°F (4°C – 29°C)
Hot Water Inlet to Outlet Differential Temperature: 5°F (3°C)
Temperature Out: Field range: 80°F – 120°F (27°C – 49°C),
adjustable; Accurate within ±3°F (1.7°C)
Maximum Temperature: 200°F (93°C)
Maximum Pressure: 150psi (1034 kPa)
Minimum Flow: 0.5 gpm (1.9 lpm) @.08psi (0.55 kPa)†
Maximum Flow: 20 gpm (76 lpm) @ 125psi (862 kPa)†
Maximum Pressure Differential between
Hot & Cold Water Supplies: 25%
Listing: ASSE 1017, ASSE 1069, ASSE 1070 and IAPMO cUPC
†When tested in accordance with ASSE 1017, ASSE 1069, ASSE 1070
and IAPMO cUPC.
Figure 4
Temperature Adjustment
1. Let the 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 4. Cap must be lifted 1/4" to
adjust temperature. To increase the temperature, turn coun-
terclockwise. To decrease temperature turn clockwise.
4. Lower handle and tighten screw.
5. Check outlet temperature.
Factory Preset: MMV-M1, LFMMV-M1: 105°F (41°C)
Under following conditions:
Cold Inlet: 60-70°F (16-21°C)
Hot Inlet: 140-145°F (60-63°C) Supply Pressure: 45psi (310 kPa)
Hot
140°F
Cold Cold
Hot
MMV-M1 or
LFMMV-M1
Mixed
110°F Mixed
110°F
Hot
Cold
Cold
Supply
Stops
Typical
Two Handled Faucet
Typical
Two Handled Faucet
Figure 2 – Typical ASSE 1070 Application
† Devices tested to ASSE 1069 or ASSE 1070 such as Watts
Series USG, LFUSG, L111, MMV or LFMMV should be used at
fixture to prevent possible injury.
Watts
Vacuum Relief
Valve
Watts Temperature Gauge
Cold
Cold
Cold
MMV-M1 or
LFMMV-M1
Tempered †
Hot
Hot to Appliances
Watts T&P
Relief Valve
*8" – 12"
H
C
M
Figure 3 – Typical ASSE 1017 Application
Hotter
3/32" Hex Wrench
Turn
Colder
Unscrew, lift
cap to adjust
*Important: To prolong the life of the series MMV and LFMMV
when used in an ASSE 1017 application, it is recommended that it
be trapped as shown; i.e. the hot water inlet to the MMV or LFMMV
should be 8"-12" (200-305mm) below the hot water supply feed.

Flow curves are for reference. Actual flows may vary depending on system
temperatures and/or pressures.
*Flow curve with integral inlet filters and check valves
Capacity*
kpa psi
345 50
276 40
207 30
138 20
69 10
0
0 2 4 6 8 10 12 14 gpm
7.6 15 23 30 38 46 53 lpm
Pressure Drop
Flow
Watts MMV-M1 and LFMMV-M1 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
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
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 Tempering valve
(see Product Guide for piping details)
D.1 Readjust valve temperature per installation instructions
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
Water temperatures in excess 110ºF (43ºC) are dangerous and may cause
scalding, severe injury or death! This valve can be adjusted to deliver water
at temperatures exceeding 110ºF (43ºC). Consequently, when used in an
ASSE 1016, ASSE 1069 or ASSE 1070 application, the installer must check
the mixed water outlet temperature at the point of use and adjust the Watts
Thermostatic Tempering Valve Series MMV or LFMMV to ensure delivery of
water at a safe temperature not exceeding 110ºF (43ºC). Mechanical valves are
not fail-safe. Due to the effects of various water conditions, periodic verification
of outlet water temperature is required.
When used in an ASSE 1017 application at the hot water source, the Watts
Thermostatic Tempering Valve Series MMV or LFMMV cannot be used by itself to
control final temperature at fixtures where ASSE Standard 1016, ASSE 1069 or
ASSE Standard 1070 listed devices are required. Such use may result in severe
bodily injury (i.e. scalding or chilling) and/or death. Additional ASSE Standard
1016, ASSE Standard 1069 or ASSE Standard 1070 listed devices, such as Watts
Series L111, LFL111, USG, LFUSG, MMV or LFMMV should be used at fixtures
to prevent possible injury.
Recirculation systems should recirculate water at temperatures over 140ºF to
reduce the risk of bacterial growth in the piping. This valve should not be used
to achieve these elevated temperatures. This valve can be used at fixtures in
conjunction with recirculation systems to reduce the system’s hot water to a safe
temperature at the point of use.
IMPORTANT
WARNING
!

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.
IS-MMV-M1 1004 EDP# 1915906 © 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
A Watts Water Technologies Company