Instruction Sheet
High Flow 5120 Series Lead Free (
≤
.25% Pb) Mixing Valve
102-491
SUPERSEDES: New
EFFECTIVE: August 1, 2013
Plant I.D. 001-4205
WARNING: Water temperatures above 120°F can cause serious injury. Mixing valve temperature setting should be
done by a licensed professional per local code requirements. Use an accurate water thermometer to verify the final
water temperature. The thermostatic strip provided must not be used for final water temperature verification.
WARNING: The High Flow 5120 Series must not be installed on steam systems (water systems only).
WARNING: High Flow 5120 Series mixing valves are certified to ASSE 1017 and not designed to compensate for
system pressure fluctuations beyond the valves variation rating and should not be used where more sophisticated
pressure compensating temperature controls are required.
CAUTION: Do not use excess thread sealant (in liquid, tape or other form) as this may cause a valve failure.
CAUTION: Valve must not be subjected to heat during the installation, this may damage the valve’s internal
components.
GENERAL:
The Taco High Flow 5120 Series is listed for ASSE 1017 applications.
• All installations should be carried out by a Licensed Professional. Failure to comply with all aspects of these instructions
may result in unsafe performance. All installations must comply with relevant State and Local codes or authorities.
• Ensure compatibility of valve installation, e.g. temperature of hot water, inlet pressure, flow rates, etc. - refer to product
specifications. If the site conditions are outside of the specifications for the valve, the site conditions must be corrected or
a valve that meets the conditions must be selected.
• Install in accordance with markings on valve body, i.e. hot water inlet - marked “H”, cold water inlet - marked “C” and mixed
outlet - marked with directional arrow.
• Valve may be installed in any position.
• Any inconsistency between these instructions and any specific instructions, bylaws or codes issued by local authorities
must be referred back to Taco, Inc. prior to any installation taking place.
• During startup ensure that the valve is set to the desired temperature (valve preset at 115-120°F (46.1-48.9°C) with 150°F
(66°C) hot water inlet temperature). If the valve temperature needs to be adjusted please refer to the instructions below (
SET-
TING VALVE OUTLET TEMPERATURE
).
NOTE: If the water supply is of poor quality a filter or strainer should be fitted at the system inlet so that both the water
heater and the mixing valve are protected from dirt and debris.
FITTING VALVE TO PIPING SYSTEM:
• Flush all piping thoroughly before installing the valve (using water only). Not flushing the system properly is the most com-
mon cause of improper valve performance.
• Union valves come complete with union type connections for ease of installation and service.
• Valve must be removed from the piping prior to soldering the end connections. It is recommended to use a spacer piece
while soldering.
SETTING VALVE OUTLET TEMPERATURE:
The Taco High Flow 5120 Series Mixing Valve is supplied factory set at 115-120°F with 150°F hot water inlet temperature. It
may need to be altered depending on operating requirements.
1. Remove the knob screw and then remove the adjusting knob, replace it in a new position, to the left side of
the lock ring to decrease temperature or to the right side to increase temperature. This will allow the knob
to rotate freely. There should be no need to remove the white locking ring. (See Figure 1)
2. To adjust the mixed outlet temperature of the valve, simply turn the knob – clockwise to reduce the temper-
ature, counter clockwise to increase the temperature – until the desired set point is reached. (See Figure 2)
3. Remove and reposition the adjusting knob so that the indication mark on the adjusting knob lines up with
the indication mark on the valve body, making sure the spline of the stem also aligns with the spline of the
cap, and push down into place (this will lock the adjusting knob into position so it cannot be rotated) and
then replace the securing screw. (See Figure 3)
4. Using an accurate thermometer, test the mixed water temperature at the nearest outlet being supplied by
the valve. The test outlet should not be a shower with its own temperature limiting control valve. This should
be opened to allow a minimum flow rate of 2.5 gpm (9.5 L/min). Allow the water to run for at least one minute
to ensure the mixed water temperature has settled. (See Figure 4)
5. A temperature strip is provided with each mixing valve and can be used as a reference to set the tempera-
ture, however a more accurate device should be used to ensure a correct temperature setting.
