Watts LF70A Series User manual

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 xture to prevent possible injury.
Thermostat and Bonnet Assembly
(B)
(C)
(D)
Repair Kit Model Ordering Code
LF70ARK ts 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

Problem & Cause Answer
A. Fluctuating or erratic hot water temperature at xture.
A.1 Heavy draws of either cold or hot water elsewhere in
the system, such as clothes washer or dishwasher.
A.1 See warning on reverse side. Hot water temperature control valves cannot compensate
for this condition. Check valves in hot and cold legs to hot water temperature control valve
would help but not cure the problem.
A.2 Unbalanced pressures. A.2 Install balancing or throttling valves (shutoff valves) in hot and cold legs to hot water
extender tempering valve and adjust accordingly for demand.
B. Hot water backing up into cold water line.
B. Hot water pressure overriding cold pressure. B. Install check valve in cold water leg to hot water temperature control valve.
C. Cannot adjust water temperature to desired temperature.
C.1 Unequal pressures. C.1 A balancing or throttling valve must be installed in the cold water leg to the hot water
temperature control valve to throttle or restrict the pressure. In most installations, the cold
water supply line feeds both the hot water temperature control valve and the water heater
or tankless heater. To compen
sate for the pressure drop through the heater, the cold
wa
ter to the hot water temperature control valve must be throttled or reduced.
C.2 Hot or cold temperature differential. C.2 Check water heater controls to verify that the water temperature is the same as the
heater thermostat setting.
C.3 Valve undersized. C.3 Check gpm ow required versus gpm ow capacity of valve.
D.
High pressure drop through hot water temperature control valve.
D. Valve undersized. D. Install larger hot water temperature control valve.
E. Insufcient hot water during peak demand
E.1 Valve undersized. E.1 Check gpm ow required during peak demand period and size hot water temperature
control valve accordingly.
E.2 Heater or capacity insufcient for demand.
F. Frequent failure of thermostatic element.
F.1
Thermostatic element exposed to extremely high
temperature.
F.1 Check heater thermostat setting.
F.1a Hot water temperature control valve must be trapped at least 8” to 12” as per installa-
tion instructions. Install check valves as recommended.
F.2
Corrosive water conditions. (Buildup of mineral
deposits)
F.2 Frequent cleaning of thermostat element and plunger would tend to prolong the life of
the element. A small coating of FDA approved silicone lubricant in the piston area of the
element would also help.
F.3 Electrolysis (pitting deterioration, etc.) F.3 Electrically ground the piping system or install dielectric unions.
G. All hot or cold water ows at hot xture.
G.1 This problem will require considerable trouble-
shooting.
G.1 Verify that complete installation instructions were followed:
A. Is valve properly trapped?
2. Check to see if thermostatic element has failed.
3. Check to see if temperature control on water heater is set at desired
temperature.
4. Check to see if minimum ow requirements for valve size are met. Minimum ow
requirements for LF70A series valves is 2 gpm.
Series LF70A Troubleshooting Guide
NOTICE
After installation please leave this instruction sheet for
occupant’s information.
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.
WARNING: This product contains chemicals known
to the State of California to cause cancer and birth
defects or other reproductive harm.
For more information: www.watts.com/prop65
IS-70A 1548 EDP# 1910210 © 2015 Watts
USA: Tel: [phone] • Fax: [phone] • Watts.com
Canada: Tel: [phone] • Fax: [phone] • Watts.ca
Latin America: Tel: [phone] • Fax: [phone] • Watts.com
A Watts Water Technologies Company