Mechanker Kft.

TH-55 Three way thermostatic mixing valve

Specifications
	Static pressure: max. 4 bar damage-free temperature: max. 100 °C Adjustment range: as shown on picture Valve plate travel: 0,2 mm/ °C Transferable output:
		NÁ 3/4" -> 18 kW (15.000 kcal/h) NÁ 1" -> 24 kW (20.000 kcal/h) NÁ 6/4" -> 48 kW (40.000 kcal/h)
	Expertise: ÉMI A-277/1987

Design

Housing and cover is grey cast iron, the knob is plastic-armoured steel, operating cartridge and valve plate are made from brass, the valve seat is grey cast iron.

Application

Mixing warm water systems' upstream and downstream water. Lower the gas side corrosion of coal-and hydrocarbon firing boiler by keeping the boiler water temperature stable (on a high degree) with a mixing valve, using upstream and downstream water at any temperature within the range shown in adjustment range before. The mixing ratio required can be adjusted by turning the knob while monitoring a thermometer installed in the mixed water pipe. menwhile the recirculation pump must be used! Adjusted mixed water temperature is kept in ±4 °C difference according to adjustment range by thermostatic operating cartridge built in valvle.

Essential for underfloor heating! Warning! Not suitable to control hot water systems that are not equipped with a recirculation pump!

Type	Measure	A	B	C	D	E
TH-55	3/4"	24	C5/4"	80	40	120
TH-55	1"	32	C6/4"	146	73	215
TH-55	6/4"	45	C2 1/4"	175	86	215

1.Cover disc
2.Rupture disc
3.Adjusting knob
4.Spring
5.Neck
6.Washer
7.Operating cartridge
8.washer
9.Valve plate
10.Housing

Adjustment range,
boiled water temp. / mixed water temp.

Installation

The valve can be concantrated to the hot water system by a flare nut. The mixing valve can be mounted in any position but the water supplied by the boiler must always arrive to the manifold located opposite the adjustment knob. The adjustment knob can be unscrewed (even under pressure) and the operating cartridge can be pushed further than the brass edge of the cartridge at a temperature of 20°C degrees, then the cartridge needs to be replaced. The mixing valve must be drained prior to replacing the cartridge. For valves NÁ 3/4" and 1" the neck must be unscrewed, for valves NÁ 6/4", screws M8 aare to be unscrewed and the cast cover removed and now the cartridge can be replaced by tilting the valve plate and taking it off the cartridge. If the boiler is equipped with its own pump (factory unit), the mixing valve may reduce the water-flow of the boiler so much so that the safety system of the boiler swithes burner off. Therefore, it is recommended installing 1/2" pipe with a throttle valve between the upstream and the downstream manifold of the boiler (installation diagram No.2)

It might occur, that the resistance of the furnace is greater than the mixing valve's pipe of the return stub. It is advised to build-in a choking valve in the return pipe to force a measure of the returning water towards the furnace.(installation diagram No.3)

Installation diagram
1	2	3

Operation

Switch on the circulation pump during start-up. Turn the adjustment knob in the middle of the groove on the neck.Touch the heatpipe to feel that water supplied by the boiler is warmer thatn the downstream water. The upstream (mixed) heating water is slightly warmer than the downstream water. Now use the sdjustment knob to close the valve. You can feel that both the upstream and downstream pipes are equally cold. Touch the naked upstream pipe with your hands, and turn the adjustment knob outwards until the pipe starts getting warmer. The valve is now in regulatory position. The temperature condition of the system will stabilize after half an hour and you may continue to turn the adjustment know as required. Give the adjustment knob only a half-turn at a time, then wait for the system to restabilize.

The two grooves on the denote the two limit positions of the adjustment knob. You will get maximum or minimum mixed water temperatures if the bottom of the adjustment know mathes with the groove further away from or closer to the valve body, respectively.

If heat absorption comes to a sudden halt in the heating cycle (for instance the circulation pump switches off), then the valve closes completely provided that the temperature of the valve body exceeds that of the mixed water by 10°C degrees.

Resistance values: M³/h water flow / Pressure drop on the valve

Warranty

Our product is fixed free of charge for 12 months from the date of purchase indicated on the invoice on condition that may break down. Therefore, the device must be used as a regulating device and not as a safety device. Please submit your guarantee claim to the phone number, fax number or address of the manufacturer.

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