Watts LF174A
Hot Water
Boiler
Tankless
Heater
Watts Pressure
Relief Valve
Watts
LF70A
Watts Check Valve
Hot to
Appliances
▼
▼
Hot
▼
Tempered
▼
Cold
▼
8"
to
12"
▼
†
*
Instructions
Series LF70A
Hot Water Extender Tempering Valves
IS-70A
*
A valve should be installed in cold water line to hot water extender tempering valve, as shown, to
help compensate for pressure drop through heater.
NOTICE
†
Valves listed to ASSE Standard 1016, 1069 or 1070 such as Watts Series LFMMV or LFUSG-B
should be used at fixture to prevent possible injury.
Thermostat and Bonnet Assembly
(B)
(C)
(D)
Repair Kit
Model
Ordering Code
LF70ARK
fits LF70A, LF70AT
0125129
LFL70ARK
LFL70A, LFL70AT
0125130
Includes O-ring and (B), Spring (C) and Thermostat
Assembly (D)
(A)
Installation Instructions
Valve should be installed by a licensed contractor.
1.
Close both the hot and cold water shutoff valves upstream of the valve.
2.
Bleed pressure from the system.
3.
Remove the thermostat and bonnet assembly (A), which is hand-tight, from body and
install valve body as illustrated in diagram. Valve must be trapped 8" to 12" as shown.
4.
Reinsert Thermostat and Bonnet assembly in body and tighten knurled portion of bonnet
securely with pliers or channel locks.
5. START UP REQUIREMENTS:
Open cold water then hot water shutoff valves. The cold
water supply line to Series LF70A valve should always be opened first to prevent possible
thermostat damage.
Adjustment
The Series LF70A features a new adjustment means which permits you to “dial” a temperature
quickly and conveniently. To increase or decrease the water temperature, simply turn the adjust-
ing cap as indicated by the arrow. The adjustment temperature range is 120°F to 160°F and will
vary depending on system water pressure changes and water temperature fluctuations.
Model LFL70A:
For lower tempered water or below 130°F, use low temperature Model LF-
L70A which provides a temperature range between 100°F-130°F.
NOTICE
Model LFL70A (low temperature model) may be used in a radiant heat appli-
cation. Other models of this valve must not be used in radiant heat applications. When installing
an LFL70A valve in a radiant heat application, the components of the radiant heat system must
be of materials with a construction of withstanding the high limit output temperatures of the
heating boiler. If you are uncertain as to the products adaptability for your application, please
consult an authorized representative before installing or using the product.
NOTICE
BE SURE TO REMOVE THERMOSTATIC ASSEMBLY from valve before
sweating connections, otherwise it will become damaged.
Minimum Flow Requirements to Maintain Set Temperature: 2 gpm for size
1
⁄
2
" and
3
⁄
4
"
Watts Vacuum
Relief Valve
Cold
▼
Watts
T&P Relief Valve
Drain
Tempered
▼
▼
Hot to
Appliances
Water Heater
Watts
LF70A
Watts
Ball Valve
†
8"
to 12"
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.
CAUTION
!
Need for Periodic Inspection
Periodic inspection by a licensed contrac-
tor is recommended. Corrosive water condi-
tions, temperatures over 210°F, unauthor-
ized adjustments or repair could render the
valve ineffective for service intended. Regu-
lar cleaning and checking of thermostat as-
sembly (A) helps to assure maximum life and
proper product function. Frequency of clean-
ing depends upon local water conditions.
†See Warning.
Watts 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 such as Watts
Series LFL111, LFMMV and LFUSG and valves should be used at fix-
tures to prevent possible injury.
The Watts 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 Watts valves
should never be used to provide “anti-scald” or “anti-chill” service.
WARNING
!
NOTICE
Inquire with governing authorities for local installation requirements
