Instruction Sheet
5000-HX Heat Only Series Mixing Valve
A Taco Family Company
102-489
SUPERSEDES: AUGUST 1, 2013
EFFECTIVE: OCTOBER 27, 2016
Plant I.D. 001-4203
WARNING: The 5000-HX is a heat only mixing valve and is designed for use in heating systems only. Do not
use in a domestic water application. Water temperatures above 120°F can cause serious injury.
WARNING: The 5000 Series must not be installed on steam systems (water systems only).
CAUTION: Check valves are integrated in the hot and cold water inlets of union style valves (straight NPT
valves, non-union, do not have checks). For correct and safe system functionality ensure that the check valves
are clean of debris and functioning correctly.
GENERAL:
The Taco 5000-HX Model is NOT certified for ASSE 1017 applications.
• NOTE: Non-union NPT valve does not have check valves.
• All installations should be carried out by a qualified professional. Failure to comply with all aspects of these instructions
may result in unsatisfactory 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 the 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 105-115°F (41-46°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 the mixing
valve is 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 type connections for ease of installation and service. Non-union versions are
available and 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 union connector to the adaptor.
SETTING VALVE OUTLET TEMPERATURE:
The Taco Series 5000-HX Mixing Valve is supplied factory set at 105-115°F with 150°F hot water inlet tem-
perature. It will need to be altered depending on operating requirements.
1. Remove the green knob by inserting a small screwdriver in the notch and gently prying up. (See Figure 1)
2. The boiler or other heat source should be up to temperature and at least 27 degrees above the desired
mixing valve set temperature. Using the groove on the top of the cover provided to fit over the adjustment
nut, adjust the knob counterclockwise to increase temperature and clockwise to decrease temperature.
(See Figure 2)
CAUTION: An accurate means of measuring output temperature of the valve is necessary in
order to prevent damage to property in some heating installations (for example, radiant slabs
with hardwood flooring).
3. Once the desired outlet temperature has been achieved refit the knob so that it snaps onto the body.
This helps to prevent tempering with the set temperature.
4. 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.
