Honeywell TM50 Product specification sheet

Construction

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

Application

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 3/4"
Setting range	30 °C - 60 °C
Flow rate at 1.0 bar
pressure differential
across valve	25 litres / min
Control accuracy	< ± 4 K

Subject to change

33

EN0H-1326GE23 R0304

TM50 Thermostatic mixing valve

3/4	3/4	approx. 93
G	G
		37
	G 3/4
	57

KB191

VST06-A

VST06-B

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.

•The cold water supply is cut off if the hot water supply is interrupted.

b) As a diverter valve on central heating systems:

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"

Accessories

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