Honeywell TM50 Product specification sheet
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
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