ACORN CONTROLS ST70 Compression Thermostatic Mixing Valve Instruction Manual
- June 4, 2024
- ACORN CONTROLS
Table of Contents
ACORN CONTROLS ST70 Compression Thermostatic Mixing Valve
NOTES TO THE INSTALLER
- Please leave this documentation with the owner of the fixture when finished.
- Please read this entire booklet before beginning the installation.
- Check your installation for compliance with plumbing and other applicable codes.
WARNING
- You are required to thoroughly read all installation instructions and product safety information before beginning the installation of this product.
FAILURE TO READ AND FOLLOW PROPER INSTALLATION AND MAINTENANCE INSTRUCTIONS MAY RESULT IN PRODUCT FAILURE WHICH CAN CAUSE PROPERTY DAMAGE, PERSONAL INJURY AND/OR DEATH.
- Acorn Controls is not responsible for damages resulting from improper installation and/or maintenance. Installation of this valve shall be done in accordance with Uniform Plumbing Code.
TO ENSURE ACCURATE AND RELIABLE OPERATION OF THIS PRODUCT, IT IS ESSENTIAL TO:
- Properly design the system to minimize pressure and temperature variations.
- Ÿ Implement an annual maintenance program to ensure proper operation and temperature setting of valve(s).
- This valve is factory preset. However, it can be adjusted to deliver scalding temperatures. It is the responsibility of the installer and or facility maintenance personnel to make sure valve outlet temperature does not exceed 110°F (43°C) after installation, maintenance or repair.
SUPPLIES REQUIRED
(Not provided by Acorn)
- Wall anchors, screws nuts and washers as required.
- Teflon tape for sealing water connections.
- Supply angle stops.
- Supply hoses.
- 5/8” wrench, adjustable wrench and 1/8” Allen wrench.
!IMPORTANT
- Flush supply lines of all foreign material such as pipe dope, chips or solder prior to connecting to mixing valve.
- To ensure proper installation, review the manual thoroughly to verify rough-ins before beginning any work.
- Installation and field adjustment are the responsibility of the installer.
- Maximum water pressure is 125 psi (8.62 bars). Maximum inlet hot water temperature is 180°F (82°C). Temperature adjustment range is 85°F115°F (29°C-46°C). Valve assembly must be drained prior to being subjected to freezing temperatures. Valve includes integral check valves.
ROUGH-IN DIMENSIONS:
INSTALLATION
- Locate the mixing valve in a suitable place accessible for servicing and adjusting. The valve should be as close as possible to point of use.
- Thoroughly flush supplies.
- Connect Hot and Cold supplies to mixing valve inlets and outlet to faucet(s). ST70-12: Valve connections are 1/2” NPT, for supply lines by others. If using the
- TwistConnect™ option refer to TwistConnect™ installation sheet 9932-000-001. ST70-38: Valve connections are 3/8” compression, Detail A. Supply tubing by others.
- Turn on supplies and inspect for leaks. Tighten connections if leak(s) are detected.
- Turn on the faucet and allow to run until the water temperature stabilizes. Measure water temperature. If water is not at desired temperature adjust as needed, (refer to adjustment section below). Maximum recommended outlet temperature is 105°F (41°C).
TEMPERATURE ADJUSTMENT:
- Loosen locknut. Detail B
- Turn the faucet on so the water temperature can stabilize.
- Using 1/8” Allen wrench turn the adjustment stem counter-clockwise for hotter or clockwise for colder outlet temperatures. Detail C
- Tighten the locknut to prevent any unauthorized or accidental temperature adjustment.
- Re-check temperature.
PIPING DETAILS
TYPICAL SINGLE-TEMPERATURE FAUCET PIPING DETAIL
Valve Specifications
- Maximum Operating Pressure: ………………. 125 PSI (861 kPa)
- Flow Rate @ 45 PSI (310 kPa) differential:
- ST70-12: …………………………………………… 4.5 GPM (17 LPM)
- ST70-38: …………………………………………… 4.0 GPM (15 LPM)
- Minimum Flow Rate*: ………………………….. 0.4 GPM (1.5 LPM)
- Maximum Hot Water Supply Temp: ………………… 180°F (82°C)
- Minimum Hot Water Supply Temp**: …………………… 5°F (3°C)
- Above Set Point
- Temperature Range*: …………………… 85°F-115°F (29°C-46°C)
- Connections ………………………. 1/2” NPT or 3/8” Compression
TROUBLESHOOTING
References
Read User Manual Online (PDF format)
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