Honeywell AMX300 Series DirectConnecct Mixing Valve Instruction Manual
- June 4, 2024
- Honeywell
Table of Contents
AMX300 Series DirectConnecct Mixing Valve
Instruction Manual
AMX300 Series DirectConnect™ Mixing Valve
INSTALLATION INSTRUCTIONS
APPLICATION
The AMX300 Series DirectConnect™ Mixing Valves fit any application requiring
accurate control of water temperature by mixing hot and cold water such as
domestic water. The valves are designed for mounting directly onto the water
heater in residences, hotels, schools, hospitals, or nursing homes.
Benefits
The AMX300 valves provide increased comfort and safety for the user, as well
as reduced installation time for the plumbing contractor.
Operation
Automatic operation is provided by a thermostatic element. The element will
control the hot and cold water supply based on the valve setting. If cold
water is shut off, the valve will reduce the mixed water flow rate in seconds.
The internal parts of the valve are coated with Teflon® to reduce scale build-
up for better performance in marginal quality water.
NOTE: Even with the Teflon® coating, the internal parts of the valve may
still suffer scale build-up and may require cleaning periodically.
SPECIFICATIONS
CAUTION Injury Hazard. Exceeding recommended maximum mix temperature can
cause bums.
NOTE : If installing AMX300 Series Valve on a system using PEX, consult
the PEX tubing manufacturer for maximum allowable temperature ratings.
Maximum Hot Water Inlet Temperature: 212° F (1000 C).
Operating cold water Inlet temperature range: 33° F to 80° F (.5° C to 27′ C).
Operating hot water Inlet temperature range: 100° F to 212° F (38° C to 100°
C).
Mixed Water Supply temperature range: 100° F to 145° F (38° C to 63° C).
Minimum Required Temperature Difference between Hot and Mix: 27′ F (15° C).
Flow Rate: Minimum – 0.25 GPM (0.95 Ipm).
Maximum – See Fig. 7.
Cv at 6 GPM:
2.7 at 100° F (38° C) mixed temperature.
2.1 at 120° F (49° C) mixed temperature.
1.5 at 140° F (60° C) mixed temperature.
Maximum Working Pressure: 150 psi.
Lead-Free Plumbing Code Compliance: The wettable sur-faces of lead-free
models contain less than .25% of lead by the weighted average
Body Material: Nickel-plated brass/bronze construction, Tef-lon® coated
valve body wear surface, Teflon® coated brass shuttle, EPDM 0-rings, and
proportional design (simultaneous control of hot and cold ports).
Dimensions: See Fig. 1.
AMX300 SERIES DIRECTCONNECT™ MIXING VALVE
INSTALLATION
NOTE TO INSTALLER: This product should be installed by a qualified
individual, in accordance with local codes and ordinances. It is the
responsibility of the installer to properly select, install and adjust these
devices as specified in these instructions.
WARNING
Compliance to ASSE 1017 code requires the installation of a check valve. An
expansion tank must be installed with the check valve to accommodate thermal
expansion.
CAUTION
Injury Hazard.
Exceeding recommended maximum mix temperature can cause burns.
The temperature of mixed water from the AMX300 Series DirectConnect Mixing
Valve outlet should not exceed 120° F (49° C).
IMPORTANT
- Do NOT expose the mixing valve to temperatures below 32° F (0° C) or allow it to freeze.
- Do NOT subject the mixing valve to excess heat during installation.
- Do NOT use excess thread sealant. if sealant inadvertently enters the mixing valve chamber, it may cause the internal assembly to malfunction.
1. Before adjusting the outlet mixed water temperature, make sure that the
AMX300 Valve is properly installed on the 3/4 in. hot water nipple of the
water heater and that the cold water supply to the AMX300 Valve is connected.
To be compliant with ASSE 1017 code, a check valve on the cold water side is
required.
2. To adjust the outlet mixed water temperature, you must first attach the
Thermostrip (included with the valve) on the outlet pipe connected to the
valve. Clean the outlet pipe of the valve first and then firmly apply the
Thermostrip. Flow water and adjust the mixed water outlet temperature to the
desired setting range.
Fig. 2. Thermostrip temperature indicator.
NOTES:
- The Thermostrip temperature markers are color-coded for easy reference (See Fig. 2). The actual mixed water temperature is indicated in green with 5° F (3° C) increments. Blue means slightly lower than displayed temperature, and brown means slightly higher than displayed temperature.
- The thermostrip is intended for a one-time use during the initial temperature setting.
- Open a hot water tap close to the water heater so that mixed water will flow through the AMX300 Valve. The Thermostrip will show the actual temperature of the mixed water within 10 seconds.
- To decrease or increase the outlet water temperature, push the mixing valve’s handle in towards the valve and turn it clockwise or counterclockwise until the desired temperature is displayed on the Thermostrip.
5. Ensure that the handwheel is in the locked-out position when finishing the temperature adjustment.
WARNING
Do not operate the valve at temperatures outside its calibrated range.
Typical Installation Diagrams
Legend:
1 = Check Valve.
V = Any device that turns the domestic water system into a closed system, such
as a backflow preventer, a check valve or a pressure-reducing valve.
T = Recirculation pump thermostat control (e.g. Honeywell L6006C1018 Aquastat
controller).
NOTE: Installing a device to function as “V” in Figs. 3 and 4 are
optional and depend on local codes. If a V-type valve is used, it is mandatory
that a thermal expansion
tank be installed as shown, otherwise, dangerously high pressures could result
or the water heater safety relief valve will frequently expel water. If no V
device is used, a thermal expansion tank is not required.
NOTE: The recirculation pump must be controlled by a thermostatic
controller. If not, a gradual increase in the temperature of the recirculation
loop, up to the temperature of the water in the storage tank, can occur.
NOTE: Installing check valve (1) on the cold water supply is required for
an ASSE 1017-compliant mixing valve installation. If a check valve is
installed, it is mandatory that a
thermal expansion tank be installed, as shown.
Recirculation Loop
The purpose of a recirculation loop is to supply immediate tempered water to
all hot water fixtures. This helps conserve water. In the recirculation loop,
the hot water supply returns from the fixture furthest from the heating source
and is connected to the AMX300 Mixing Valve recirculation port (marked “R” on
the valve body) and the cold supply line of the water heater.
The AMX300 Mixing Valve allows easy recirculation connection through the
integrated recirculation port. A temperature-controlled circulating pump is
required to move the tempered water through the recirculation loop. The
Honeywell L6006C1018 Aquastat® Controller is the recommended temperature
control device for the circulator.
The Honeywell Aquastat Controller should be set 5° to 10° F (3° to 5° C) below
the controlled mixed water outlet temperature.
CAUTION
Injury Hazard.
Exceeding recommended maximum outlet mixed water temperature can cause burns.
The AMX300 Series DirectConnect Mixing Valve outlet mixed water temperature
should not exceed 120° F (49° C).
VALVE MAINTENANCE
Hard water conditions may result in scale deposits causing binding of internal
parts in extreme cases. Cleaning the internal parts will usually restore the
valve operating
conditions. In some cases, it may be necessary to replace the lower assembly.
(See Fig. 5.) A Thermostatic Element
Replacement Kit, AM-1-025RP, is provided by Honeywell.
To clean or replace the lower assembly, shut off the water supply and:
-
With a screwdriver, remove the screw and the handwheel.
-
Unscrew the lower nut (turn it counterclockwise) to remove the top assembly. The brass top assembly will pop up.
-
Remove the lower assembly, diffuser, and spring.
WARNING
Do not use solvents or scratch the metallic or Teflon® coated surfaces. -
Carefully remove any scaling (calcium deposits) or foreign particles from the valve seat and other internal parts. Use vinegar to remove the calcium deposits. Soak parts until the calcium deposits become soft enough to be scrubbed and washed off.
-
Replace the clean spring, diffuser and lower assembly following the instructions below or use a new replacement kit assembly.
a. Insert the spring into the diffuser.
b. Insert the diffuser with the spring end first into the body.
c. Fit the valve top assembly into the lower assembly and insert into the valve.
d. Tighten the lower nut.
e. Tighten the upper nut. -
Place the handwheel on the valve.
-
Screw the handwheel onto the valve.
-
Push down and turn the handwheel to set the desired temperature.
NOTE: The AMX300LF (lead-free) includes an optional “C” clip that can be
installed to prevent further adjustment of the temperature. See Fig. 8 for the
installation location.
Notice: The optional “C” clip is designed to be very difficult to remove
after it has been installed. Install it only after the desired output
temperature setting is achieved.
NOTE: Additional thermostrips are available from Honeywell in packs of 10
(TS205-064).
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