Install Instructions

Watts 174A
Hot Water
Boiler
Tankless
Heater
Watts Pressure
Relief Valve
Watts 70A
Watts Check Valve
Hot to Appliances
▼
▼
Hot
▼
Tempered
▼
Cold
▼
8"
to
12"
▼
†
*
Series 70A
Hot Water Extender Tempering Valves
Installation instructions
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.
† Note: Valves listed to ASSE Standard 1016 or 1070 such as Watts Series L111, MMV or USG-B
should be used at fixture to prevent possible injury.
*ATTENTION INSTALLER: After installation
please leave this instruction sheet for
occupant’s information.
IMPORTANT: Inquire with governing authori-
ties for local installation requirements.
Thermostat and Bonnet Assembly
(B)
(C)
(D)
Repair Kit Model Ordering Code
70ARK fits 70A, 70AT 0869100
L70ARK L70A, L70AT 0869130
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 70A valve should always be opened first to prevent possible
thermostat damage.
Adjustment
The Series 70A 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 L70A: For lower tempered water or below 130°F, use low temperature Model L70A or
LFL70A which provides a temperature range between 100°F-130°F.
NOTE: Model L70A (low temperature model) may be used in a radiant heat application. Other
models of this valve must not be used in radiant heat applications. When installing an L70A
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.
CAUTION: Need for Periodic Inspection
Periodic inspection by a licensed contractor is recommended. Corrosive water conditions, tem-
peratures over 210°F, unauthorized adjustments or repair could render the valve ineffective for
service intended. Regular cleaning and checking of thermostat assembly (A) helps to assure
maximum life and proper product function. Frequency of cleaning depends upon local water
conditions. †See Warning.
IMPORTANT: 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 70A
Watts
Ball Valve
†
8"
to 12"
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 MMV, USG, and L111 valves should be used at fixtures to pre-
vent 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
!