Installation
The following instructions must be read prior to the installation of a Caleffi 521201 NTR
thermostatic mixing valve. The installer should also be aware of his responsibility and duty of care
to ensure that all aspects of the installation comply with current regulations and legislation. The
Caleffi 521201 NTR should be installed using the appropriate standard, code of practice and
legislation applicable to each state and following the details in this manual. The Caleffi 521201
NTR series must be installed by a licensed plumber.
Prior to the installation of the Caleffi 521201 NTR valve, the system must be checked to ensure
that the
system operating conditions fall within the recommended operating range of the
valve, i.e. verify supply temperatures, supply pressures, risk assessments, etc.
The supply system into which the Caleffi 521201 NTR is to be installed must be thoroughly flushed
and cleaned to remove any debris which may accumulate during the installation. Failure to remove
any debris will affect the performance and the manufacturer’s warranty on the product. In areas
that are subject to high levels of aggressive water, provision must be made to treat the water prior
to it entering the valve.
The valve is recommended to be installed in a position oriented with the cover to the right with cold
inlet/outlet on the right side (allowing direct connection to the sink’s cold water inlet fitting) resulting
in the hot inlet/mix outlet on the left aligning direct to the hot water inlet sink fitting. It is essential
that the access to the valve is not obstructed for future maintenance that may be required to the
valve or associated fittings.
It is essential that when the installation is designed and/or installed, all current legislation is noted,
e.g. the maximum distance from the outlet of the valve to any terminal fitting.
The connecting hot and cold water supplies must be connected to the valve strictly in accordance
with the indications on the body of the valve. The inlets of the valves are clearly marked with the
letter H (Hot) and C (Cold). The outlet is marked with the word MIX. The valve has male 3/8”
threads for connection to standard 3/8” faucet connectors and stops.
Where one or both the incoming supply pressures are excessive, a Caleffi pressure reducing valve
should be installed to reduce the pressure(s) within the limits.
The Caleffi 521201 NTR valve is supplied complete with the check valves at the hot and cold
inlets.
Mount the 521201 NTR valve to the wall underneath the sink with black plastic mounting bracket
supplied with valve but not attached. Use mounting screw to attach the mounting bracket to the
valve to meet the orientation described above. Break off the adjustment key for adjusting the
termperature, see commisioning section.
To ensure that the performance of the Caleffi 521201 NTR valve is maintained (in the event of cold
water failure), the temperature of the hot water supply at the point of entry to the valve must be a
minimum of 10 °C higher than the set mixed water discharge temperature.
If the valve is not installed correctly, it will not function correctly and may put the user in danger.
