Install Instructions

Problem & Cause
A. Fluctuating or erratic hot water temperature at fixture.
A.1 Heavy draws of either cold or hot water elsewhere in the
system, such as clothes washer or dishwasher.
A.2 Unbalanced pressures.
B. Hot water backing up into cold water line.
B. Hot water pressure overriding cold pressure.
C. Cannot adjust water temperature to desired temperature.
C.1 Unequal pressures.
C.2 Hot or cold temperature differential.
C.3 Valve undersized.
D.
High pressure drop through hot water temperature control valve.
D. Valve undersized.
E. Insufficient hot water during peak demand
E.1 Valve undersized.
E.2 Heater or capacity insufficient for demand.
F. Frequent failure of thermostatic element.
F.1
Thermostatic element exposed to extremely high temperature.
F.2 Corrosive water conditions. (Buildup of mineral deposits)
F.3 Electrolysis (pitting deterioration, etc.)
G. All hot or cold water flows at hot fixture.
G.1 This problem will require considerable troubleshooting.
Answer
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 Install balancing or throttling valves (shutoff valves) in hot
and cold legs to hot water extender tempering valve and
adjust accordingly for demand.
B. Install check valve in cold water leg to hot water tempera-
ture control valve.
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 Check water heater controls to verify that the water tem-
perature is the same as the heater thermostat setting.
C.3 Check gpm flow required versus gpm flow capacity of valve.
D. Install larger hot water temperature control valve.
E.1 Check gpm flow required during peak demand period and
size hot water temperature control valve accordingly.
F.1 Check heater thermostat setting.
F.1a Hot water temperature control valve must be trapped at least
8” to 12” as per installation instructions. Install check valves
as recommended.
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 Electrically ground the piping system or install dielectric unions.
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 flow requirements for valve size
are met. Minimum flow requirements for 70A series
valves is 2 gpm.
Series 70A Troubleshooting Guide
IS-70A 1004 EDP# 1910210 © 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
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
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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
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