Montague 70A Installation Manual
Series 70A
Hot Water Extender Tempering Valves
Installation instructions
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 MMV, USG, and L111 valves should be used at fixtures 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.
IMPORTANT: BE SURE TO REMOVE THERMOSTATIC
ASSEMBLY from valve before sweating connections,
otherwise it will become damaged.
*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.
Minimum Flow Requirements to Maintain Set Temperature: 2 gpm for size 1⁄2" and 3⁄4"
Watts Vacuum
Relief Valve
Cold
8"
to 12"
Watts 174A
Hot Water
Boiler
Tankless
Watts Pressure
Relief Valve
▼
Heater
Hot to
Appliances
Watts
Ball Valve
Water Heater
Hot
8"
to
12"
Watts
T&P Relief Valve
▼
▼
Hot to
Appliances
▼
▼
▼
IS-70A
†
Drain
Watts 70A
▼
†
Tempered
Watts 70A
*
Watts Check Valve
▼
▼
Tempered
Cold
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 adjusting 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, temperatures 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.
Thermostat and Bonnet Assembly
(A)
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)
*ATTENTION INSTALLER: After installation
please leave this instruction sheet for
occupant’s information.
IMPORTANT: Inquire with governing authorities for local installation requirements.
(B)
(C)
(D)
Series 70A Troubleshooting Guide
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.
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
the pressure drop through the heater, the cold wa
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.
sate for
ter to the hot
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 installation 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 flows at hot fixture.
G.1 This problem will require considerable troubleshooting.
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.
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.
A Watts Water Technologies Company
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
IS-70A 1004 EDP# 1910210 © 2010 Watts
Loading...