CALEFFI SinkMixer 521201A Guide

Product range
521201A SinkMixer Under sink thermostatic mixing valve with compression union
connections...................................................................................................................size 3/8”
SinkMixer™ Under Sink Thermostatic Mixing Valve
Technical specifications
Materials:
- Valve body, regulating spindle, spring holder and cold inlet union nut:
Low-lead brass (<0.25% lead content)
- Internal shutter: Polysulfone
- Hot inlet strainer: AISI 304 stainless steel
- Spring: AISI 302 stainless steel
- Seals: Peroxide-cured EPDM
- Cover: ABS white
- Mounting bracket and adjustment key: Polyamide Nylon
Temperature adjustment range: 95–120°F (35–50°C)
Temperature set: must be commissioned on site to achieve desired temperature
Temperature stability: ±3°F (±2°C)
Cold inlet temperature: Minimum 39°F (4°C); Maximum 85°F (29°C)
Hot inlet temperature: Minimum 120°F (49°C); Maximum 195°F (90°C)
Maximum operating differential pressure: Static: 150 psi (10 bar); Dynamic: 70 psi (5 bar)
Minimum operating differential pressure (dynamic): 1.5 psi (0.1 bar)
Maximum unbalanced dynamic supply (hot/cold or cold/hot): 2:1
Minimum temperature differential between hot water inlet
and mixed water outlet to ensure thermal shutoff function: 18°F (10°C)
Minimum temperature differential between mixed water outlet
and cold water inlet to ensure stable operation: 9°F (5°C)
Minimum flow rate for stable operation: 0.35 gpm (1.3 l/min)
Certifications:
1. ASSE 1070/CSA B125.3-2012, certified by ICC-ES, file PMG-1358.
2. NSF/ANSI 372-2011, Drinking Water Systems Components-Lead Content Reduction of Lead in
Drinking Water, California Health and Safety Code 116875 S.3874, Reduction of Lead in Drinking
Water Act, certified by ICC-ES, file PMG-1360.
3. Complies with codes IPC, IRC, UPC and NPC.
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© Copyright 2019 Caleffi code 521201A
H0007288
www.caleffi.com
ASSE 1070
INSTALLATION AND COMMISSIONING MANUAL
Function
The Caleffi SinkMixer™ thermostatic mixing valve is used in under sink
and under counter applications where the user must be protected from
the danger of scalding caused by hot water. The Caleffi SinkMixer, code
521201A, provides water at a safe and usable temperature in situations
where the control of the temperature of the water discharging from a
terminal fitting is of the utmost importance, i.e. within hospitals, schools,
nursing homes, etc. The valve is designed to prevent the flow of water
discharging from the mixed water outlet in the event of the failure of hot
or cold supply. It is compact for easy installation and includes a cold
water outlet to the fixture eliminating the need for additional piping and
a tee for standard three-port mixing valves. It has integral check valves
on the hot and cold inlets and is certified to Low Lead Plumbing Law by
ICC-ES, ASSE 1070 listed (temperature cannot exceed 120°F).

CAUTION: If the thermostatic mixing valve is not installed, commissioned and
maintained properly, according to the instructions contained in this
manual, it may not operate correctly and may endanger the user.
CAUTION: Make sure that all the connecting pipework is water tight.
CAUTION: When making the water connections, make sure that the
pipework connecting the thermostatic mixing valve is not mechanically
over-stressed. Over time this could cause breakages, with consequent
water losses which, in turn, could cause harm to property and/or people.
CAUTION: Water temperatures higher than 100°F can be dangerous. During
the installation, commissioning and maintenance of the thermostatic mixing
valve, take the necessary precautions to ensure that such temperatures do
not endanger people.
Leave this manual for the user.
SAFETY INSTRUCTION
This safety alert symbol will be used in this manual to draw attention to safety related instructions.
When used, the safety alert symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS
INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN A SAFETY
HAZARD.
CAUTION: All work must be performed by qualified personnel trained in the
proper application, installation, and maintenance of systems in accordance
with all applicable codes and ordinances.
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CAUTION: To prevent any damage which will cause the thermostatic mixing
valve to not operate correctly, treat highly aggressive water before entering the
thermostatic mixing valve.
WARNING: This product can expose you to chemicals including lead, which is
known to the State of California to cause cancer and birth defects or other
reproductive harm. For more information go to www.P65Warnings.ca.gov.

ATTENTION: Lorsque vous effectuez les raccordements d'eau, assurez-vous
que la tuyauterie reliant le termostatico regolabile n'est pas mécaniquement
des overstressed. Au fil du temps, ceci pourrait causer des ruptures, avec
pour consequence des pertes en eau qui, à leur tour, peuvent causer des
dommages à la propriété et/ou les gens.
Ce symbole d'avertissement servira dans ce manuel à attirer l'attention sur la sécurité concernant
instructions. Lorsqu'il est utilisé, ce symbole signifie.
ATTENTION! DEVENEZ ALERTE ! VOTRE SÉCURITÉ EST EN JEU ! NE PAS SUIVRE CES
INSTRUCTIONS PEUT PROVOQUER UN RISQUE DE SECURITE.
ATTENTION: Tous les travaux doivent être effectués par du personnel
qualifié formé à la bonne application, installation et maintenance des systèmes
conformément aux codes et règlements locaux.
ATTENTION:Si le réducteur de pression, termostatico regolabile, n'est pas installé,
mis en service et entretenu correctement, selon les instructions contenues dans ce
manuel, il peut ne pas fonctionner correctement et peut mettre en danger l'utilisateur.
ATTENTION: S'assurer que tous les raccordements sont étanches.
ATTENTION: Les températures de l'eau supérieure à 100°F (38°C) peut
être dangereux. Au cours de l'installation, mise en service et l'entretien de
le réducteur de pression, le termostatico regolabile, prendre les precautions
nécessaires afin de s'assurer que de tells températures ne compromettent
pas les gens.
ATTENTION: Pour prévenir tout dommage qui provoque le termostatico
regolabile à ne pas fonctionner correctement, le traitement de l’eau très
agressive avant d’entrer dans la vanne de le termostatico regolabile.
CONSIGNE DE SÉCURITÉ
LAISSEZ CE MANUEL AVEC L’UTILISATEUR
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AVERTISSEMENT: Ce produit peut vous exposer à des produits chimiques comme
le plomb, qui est connu dans l’État de Californie pour causer le cancer, dommages
à la naissance ou autre.
Pour plus d’informations rendez-vous www.P65Warnings.ca.gov.

Thermal shutoff
In the event of a failure of the hot supply port, the piston closes the cold supply port. Similarly, if
the cold water supply fails, the piston closes the hot supply port. The Caleffi 521201A thermostatic
mixing valve requires a minimum temperature differential from hot inlet to mixed water outlet of
18°F (10°C) to ensure the correct operation of the thermal shutoff feature.
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Operating principle
The thermostatic mixing valve mixes hot and cold water in such a way as to maintain constant
set temperature of the mixed water at the outlet. A thermostatic element is fully immersed into the
mixed water. This element then contracts or expands causing movement of the piston, closing
either the hot or cold inlets, regulating the flow rates entering the valve. If there are variations of
temperature or pressure at the inlets, the internal element automatically reacts to restore the original
temperature setting. In the event of a failure of either the hot or cold supply, the piston will shut off,
stopping water discharging from the mixed water outlet.
COLD INLET
HOT INLET
MIX OUTLET COLD OUTLET

Flow curve
10
0.1
2 5
1
0.2
0.3
0.5
20
p (psi)
G(l/min)(
gpm
)
10
2
3
5
20
0.1
1
0.2
0.3
0.5
(psi) (bar )
10
2
3
5
20
1 0
.5
2 5
0.01
0.1
0.02
0.03
0.05
1.0
0.2
0.3
0.5
4
0.4 0.4
4
0.04
0.4
0
.3
Kv=.45
Cv= .52
Δ
Use
The Caleffi 521201A SinkMixer thermostatic mixing valve is intended for use in under sink and
under counter applications in accordance with installation rules and indications specified in ASSE
1070 standards.
The system must be sized taking into account the current legislation with regard to the nominal
flow rate of each outlet.
The SinkMixer is used to prevent accidental scalding with the outlet water temperature properly
adjusted using a thermometer at the faucet to measure the desired temperature.
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Flow should never exceed standards for pipe size and materials.

Dimensions
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Replacement parts
Replacement check valve and strainers for
521201A under sink thermostatic mixing valves.
F0001270.........check valve and two strainers,
one set for the cold inlet port and one set for the
hot inlet port.
DESCRIPTIONCODE
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Attention, document managed by software system: in case of external distribution, its update and validity must be checked at any need. Hand changes are forbidden.
Questo documento non è da ritenersi impegnativo. Ci riserviamo il diritto di modicare i nostri prodotti, di apportare miglioramenti tecnici e di svilupparli ulteriormente. Attenzione,
This document can not be considered binding. We reserve the right to change our products, to produce technical improvements and to further develop them.
1234
ABCDEF
F
E D C B A
1234
A4
1 3/8”
3 1/2”
3/8” compression* 3/8” compression*
3/8” compression* 3/8” compression* 1 1/16”
3 3/16”
MIX SOTTOLAVABO 30-50°C(90-120°F) 521201A
Code 521201A 0.5 lb /0.3
*Actual thread is 9/16” - 24 UNEF.

Installation
The following instructions must be read prior to the installation of a Caleffi 521201A SinkMixer 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 521201A 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 521201A series must be installed by a licensed plumber.
Prior to the installation of the Caleffi 521201A 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 521201A 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 orieinted 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” compression threads for
conection to standard 3/8” compression 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 521201A valve is supplied complete with the check valves at the hot and cold inlets.
Mount the 521201A 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 521201A 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
18°F 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.
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Installation diagram
COLD
HOT
8
Point of use

Commissioning
Upon completion of the installation, the valve should be tested and commissioned as per the
procedure outlined below or as specified by the local authority.
The following instructions should be read and understood prior to commissioning the Caleffi
521201A thermostatic mixing valve. If, under any circumstances, there are aspects of the
installation/system which do not comply with our requirements or the specifications as listed, the
valve must not be put into service until the installation/system does comply.
1) Ensure that the system is throughly clean and free from debris prior to commissioning the
thermostatic mixing valve.
2) Use a suitably calibrated, accurate digital thermometer to commission temperatures by
measuring the mixed water temperature at the outlet.
3) In accordance with the anti-scald requirements, water installation shall deliver hot water at
the outlet of the sanitary fixtures used primarily for personal hygiene purposes at a
temperature not exceeding 120°F (49°C) or as specified by authority having jurisdiction.
4) The temperature at the outlet of each valve must be set taking into consideration any
fluctuations which may occur within the system due to simultaneous demand.
5) Once the supply temperatures are stabilized and the normal operating conditions are
established, the valve can be commissioned. The temperature setting can be adjusted by with
the black plastic adjustment 1/4” hex key, included separately in the box.
Break off from the mounting bracket. Use the following sequence when commissioning the
valve.
a) Using a thermometer, measure the temperature of the sink faucet discharge with the
hot tap open, cold tap closed. The temperature should not exceed the temperature
allowed by the applicable standard or code of practice for each state.
b) Adjust mixing valve to desired faucet discharge temperature, with provided 1/4” hex
key.
c) Perform the thermal shut-off test. Isolate the cold water supply to the Caleffi valve
and monitor the mixed water temperature. The outlet flow should quickly cease
flowing.
d) Restore the cold water supply to the valve and measure and record the outlet
temperature after the mixed water temperature has stabilized. The final temperature
found during this test should not exceed the permitted values ±3°F.
6) Once the desired temperature has been reached, remove the adjustment key and store in a
safe place that can be located if required in the future.
We recommend that the above information is recorded in the Commissioning Report and updated
on the Service Report when any work is performed on the valve.
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Temperature adjustment
COLD
COLD
HOT
MIX
Remove 1/4” hex key from mounting
bracket.
Remove white cap.
Adjust temperature setting with 1/4” hex key. After
adjustment, lock the temperature with locking nut.
Replace cap and store key in safe place.
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2
3
4
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