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Instruction Sheet

5120-2 Series Lead Free (≤ .25% Pb) Mixing Valve

102-490

SUPERSEDES: New EFFECTIVE: August 1, 2013

Plant I.D. 001-4204

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 and ver-

ify the final water temperature. The thermostatic strip provided must not be used for final water temperature

verification.

WARNING: The 5120 Series must not be installed on steam systems (water systems only).

WARNING: 5120 Series mixing valves are 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. These mixing valves are not intended to provide protection against

thermal shock.

GENERAL:

The Taco 5120 Series is dual listed for both ASSE 1070 and ASSE 1017 applications.

• NOTE: Non-union NPT valve is ASSE 1017 only and does not have check valves.

• All installations should be carried out by a Licensed Professional. Failure to comply with all aspects of these instruc-

tions 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 spec-

ification section. If the site conditions are outside of the specifications for the valve, the site conditions must be cor-

rected 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 author-

ities 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 (46-49°C) with 150°F

(66°C) hot water inlet temperature). If the valve temperature needs to be adjusted please refer to the instructions below

(SETTING 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

common cause of improper valve performance.

• Union valves come complete with union style connections for ease of installation and service. Non-union versions

have NPT threads built into the body.

• Valve must be removed from the piping prior to soldering the end connections. It is recommended to use a spacer piece

while soldering.

• For models using the temperature gauge and adaptor on the mixed outlet, attach the adaptor to the

mixing valve body, insert the temperature gauge into the adaptor well and then attach the valve union

connection to the adaptor.

SETTING VALVE OUTLET TEMPERATURE:

The Taco Series 5120 Mixing Valve is supplied factory set at 115-120°F with 150°F hot water inlet temper-

ature. It may need to be altered depending on operating requirements.

1. Rotate the green knob counterclockwise to increase the outlet temperature and clockwise to decrease

the outlet temperature. (See Figure 1)

2. Turn both the hot and cold water supplies on. Open the outlet closest to the mixing valve, preferably a

sink rather than a shower. To calibrate, let the water run for 2 minutes and measure the outlet temper-

ature with a thermometer. Adjust the outlet temperature to the desired setting.

3. A temperature strip is provided with each mixing valve and can be used as a reference to set the tem-

perature, however a more accurate device should be used to ensure a correct temperature setting.

Summary of content (4 pages)

PAGE 1
Instruction Sheet 102-490 5120-2 Series Lead Free (≤ .25% Pb) Mixing Valve SUPERSEDES: New EFFECTIVE: August 1, 2013 Plant I.D. 001-4204 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 and verify the final water temperature. The thermostatic strip provided must not be used for final water temperature verification.
PAGE 2
ADJUSTING MAXIMUM TEMPERATURE (NON-ASSE 1070 APPLICATIONS): NOTE: Maximum temperature must only be adjusted above 120° in installations which are outside the scope of ASSE 1070. To adjust the maximum temperature: • Unscrew the retaining screw to remove the cap. (Figure 2) • Lift the limit stop ring off of the spindle, rotate to the new maximum temperature position and place the limit stop back on the spindle. (Figure 3) • Replace the cap and install the retaining screw.
PAGE 3
TROUBLESHOOTING: This troubleshooting table is intended as a helpful guide and is not all inclusive. There could be other causes and solutions for a non-functioning product. FAULT / SYMPTOM CAUSE 1. The desired mixed water temperature cannot be obtained or valve is difficult to set. • Inlet temperatures are not within specification limits. • Hot and cold supplies are reversed. • Strainers are blocked. 2. Mix temperature unstable or changing over time. 3.
PAGE 4
O-RING/PISTON SUB-ASSEMBLY REPLACEMENT: 1. Isolate the valve from the water supply. 2. Unscrew the union nuts and remove the valve body from the system. For non-union valves remove the valve body from the piping system. Removing the valve from the piping system is not required but may make replacement easier. 3. Using a screwdriver, remove the green cap from the valve. 4. Secure the valve body (using the flats on the body) and unscrew the brass cap to remove the internals of the valve. 5.