Construction
A
The thermostatic mixing valve comprises:
• Housing
• Adjuster knob
• Thermostat
Materials
• Dezincification-resistant brass housing
• Moving parts of high-quality,scale-resistant synthetic
material
• Plastics adjuster knob
• EPDM sealings
• Stainless steel spring
TM50
Thermostatic mixing valve
with scald protection
Product specification sheet
pplication
TM50 thermostatic mixing valves provide control of the water
temperature and are used:
• For centralised control on hot water supply units or for
localised control adjacent to point-use outlets. Or for use
with solar-heated hot water units with dual energy source.
• In heating systems with underfloor heating or for limiting
boiler return temperatures.
Where a system includes a hot water circulation circuit, a
KB191 return flow retarder unit (see accessories) must be
fitted to prevent cold water backfeeding and cooling the
mixed water at the outlets.
Special Features
• Highly sensitive thermal element with good all-round
water temperature sensing, even at low flow rates
• Simple setting of the required water temperature
• Scald protection - the hot water inlet is automatically cut off
if the cold supply fails provided that the hot water inlet
temperature is at least 10 K higher than that of mixed
water setting
• The cold water inlet is automatically cut off if the hot supply
fails
• Inner components are of scale-resistant materials
• Complies with KTW requirements
Range of Application
Flow medium Water
Operating pressure Maximum 10 bar
Maximum pressure
difference between hot
and cold inlet supplies 2.5 bar
Technical Data
Installation orientation As required
Hot water inlet
temperature Maximum 90 °C
Connection sizes G
Setting range 30 °C - 60 °C
Flow rate at 1.0 bar
pressure differential
across valve 25 litres / min
Control accuracy < ± 4 K
3
/4"
Subject to change 33 EN0H-1326GE23 R0304
TM50 Thermostatic mixing valve
A
G 3/4
G 3/4
57
Method of Operation
a) As a mixing valve for hot water supply and heating systems:
The highly sensitive thermal element located in the outlet of the
valve controls a plug which regulates the flow proportions of cold
and hot water in relation to the mixed hot water setting selected.
Soft seatings are fitted to both hot and cold water inlets.
They provide:
• A positive hot inlet shutoff if the cold water supply is
interrupted, provided that the hot water inlet temperature is
at least 10 K higher than that of the mixed water setting.
approx. 93
G 3/4
• The cold water supply is cut off if the hot water supply is
interrupted.
b) As a diverter valve on central heating systems:
37
For this application flow through the valve is in the reverse direction compared with its use as a hot water mixing valve. The inlet
water passes around the sensing element and regulates the control piston so that for temperatures above the set value the water
is returned to the heating circuit and for temperatures lower than
the set value the water is diverted to the boiler.
Options
TM50-1/2E = with male connection G
3
/4"
KB191
VST06-A VST06-B
ccessories
KB191 Return flow-retarder unit
for fitting to systems which include a hot water
circulation circuit - to prevent cold water backfeeding and cooling the mixed water at the outlets.
Operating pressure: Maximum 10 bar
Operating temperature: Maximum 90 °C
Installation orientation: Arrow pointing in flow
direction
VST06 Connection set
With threaded or solder connections
A = Threaded male connections
B = Solder connections
EN0H-1326GE23 R0304 34 Subject to change
Installation Examples
r
r
r
r
a) Mixing valve in hot water supply systems
TM50 Thermostatic mixing valve
KB191
Central control of wate
temperature
Zone control of wate
temperature
a) Mixing valve in central heating systems
Heating circuit at boile
Underfloor heating
temperature
Installation Guidelines
• Install so that the valve is not strained or twisted
• Fit a return flow-retarder unit where the hot water supply
system includes a circulation circuit
• Observe the flow direction arrow when fitting a KB191
return flow-retarder unit
• To prevent the growth of legionella, DVGW-W551 and
W552 specify that the water volume in the pipework
between the mixer valve and the furthest take-off point
should not exceed 3 litres. This corresponds to a maximum
length of 10 metres for
3
/4" (20 mm) pipework and
17 metres for 1/2" (15 mm)
Maintenance
No specific maintenance is necessary under normal operating
conditions. However, all moving parts which may be subject
to wear can be exchanged.
Central control of wate
temperature in solar heated,
dual-energy-source systems
b) Diverter valve in central heating systems
Limiting of boiler return
temperature
Typical Applications
TM50 thermostatic mixing valves can be used within the
limits of their specification for the control of hot water supply
or central heating systems.
Some typical applications are:
a) Hot water supply systems:
• Single and multiple-occupancy households
• Retirement homes
• Children's nurseries
• Schools
• Hotels
• Commercial kitchens
• For industrial applications with control either from a
central location or adjacent to point-of-use outlets
b) Central heating systems:
• As a mixing valve for underfloor heating systems
• As a diverter valve for limitation of boiler return
temperatures
Subject to change 35 EN0H-1326GE23 R0304
TM50 Thermostatic mixing valve
Automation and Control Products
Honeywell GmbH Phone: (49) 6261 810
Hardhofweg Fax: (49) 6261 81309
D-74821 Mosbach braukmann@honeywell.com http://europe.hbc.honeywell.com
EN0H-1326GE23 R0304 36 Subject to change
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