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AMX300 DIRECTCONNECT™ MIXING VALVE KITS
WARNING
Water inside the water heater is very hot and
presents a scalding hazard.
If the AMX300 mixing valve kit is being installed on a
water heater that is already operational, be careful
when draining the hot water supply lines in preparation
for connecting the mixing valve kit.
Setting Homeowner Expectations
Make sure the homeowners know what to expect from their
AMX300 mixing valve kit. Show the homeowner the
procedure for adjusting the AMX300 mixing valve if, in the
future, they are not satisfied with the temperature of the hot
water delivered to the fixtures in the house. Outline the
potential scalding hazard if the mixed water temperature is set
too high and answer any questions the homeowner may have.
Recommend to the homeowner that the mixing valve kit be
checked annually to ensure it continues to operate correctly.
These installation instructions must be left with the
homeowner for future reference.
Important Installation Requirements
Follow professional safety standards and all local regulations.
Consult local plumbing codes prior to installing the AMX300
mixing valve kit.
PREPARATION FOR
INSTALLATION
The following steps should be taken to ensure proper
conditions for operation:
1. Check the operating conditions (temperature, pressure
and flow rate) of the system where the mixing valve kit
will be installed and ensure they do not exceed the
specifications of the mixing valve (refer to literature #
62-3112, AMX300 Series DirectConnect™ Mixing Valve
Installation Instructions). All specifications must be met
before installing the mixing valve kit.
2. If the water supply is of poor quality, the internal compo-
nents may jam requiring an additional filter or strainer to
be fitted to the system. Contact a plumbing professional
for appropriate materials and installation.
3. This mixing valve kit MUST NOT be subjected to heat
during installation as this may damage the internal com-
ponents.
62-3113—01
CAUTION
Applying heat to these valves can damage the
mixing valve's internal components, causing it to
not regulate the mixed water temperature properly.
If using sweat fittings to connect the mixing valve kit to
the plumbing system, DO NOT apply heat to the
mixing valve after it is connected to the water heater.
Sweat the copper tubing of the plumbing system to the
threaded adapter before connecting the adapter to the
mixing valve.
4. The valve MUST NOT be allowed to freeze. If the mix-
ing valve kit is installed in a location where freezing
could occur, suitable insulation must be used to prevent
damage.
5. DO NOT use excess thread sealant (in liquid, tape or
other form) on the NPT threads, as this may cause the
mixing valve kit to fail; ensure that thread sealant does
not get into the internal parts of the mixing valve kit. Do
not use ANY thread sealant on flare connections of the
flexible metal connector.
6. When installing the AMX300 mixing valve kit on a water
heater with a blower mounted on top, the blower unit
must be removed prior to installation of the mixing valve
kit and replaced after the kit is installed. If the water
heater is gas-fired, the mixing valve kit must be con-
nected to the water heater before the draft hood is
installed. When installing an AMX300 mixing valve kit
on an existing water heater, it may be necessary to
remove the draft diverter and some of the vent sections
before installing the AMX300 mixing valve kit.
7. The AMX300 mixing valve kit is intended for use ONLY
on water heaters in potable water systems. It must
never be installed on a water heater that has previously
been used with a non-potable water heating system,
due to the potential for contamination from toxic materi-
als used in theses types of systems (e.g. boiler treat-
ment chemicals).
8. Remove all components from the AMX300 mixing valve
kit box and check that all required components are
included. The required components are: AMX300 mix-
ing valve, cold water tee, flexible metal connector, ther-
mostrip and installation instructions (see Fig. 1).
9. The AMX300T kit includes a flexible metal connector
suitable for water heaters with an 8-in. spacing between
the hot and cold water nipples on top of the tank. The
AMX302T includes a flexible metal connector suitable
for water heaters with an 11-in. spacing.
2
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