Icma 148 | Thermostatic mixer with tails on the three ways

The burn-proof thermostatic
mixers, series 148-149-165-166,
are utilized in domestic hot water
heating systems and function in
continuous operation.
Their purpose is to maintain a
constant temperature in the mixed
water conveyed to users regardless
of any variations in the pressure or
temperature values of the hot and
cold water at the mixer inlet, or in
the flow meter.
They are also equipped with a burn-proof safety system: this allows the flow of hot water to be shut off automatically
as soon as cold water is missing at the mixer inlet.
Article 165 is also equipped with two non-return valves placed at the hot and cold water inlets; their function is to
prevent any undesired fluid returns to the system.
Mixer operation is based on the temperature sensor contained
inside the mixer, in the mixed water outflow area.
Variations in the expansion of the thermostatic component
cause the plunger contained inside the mixer body to slide. This
generates correct mixing of the cold and hot water at the water
distribution system inlet.
In this way, the mixer automatically maintains the temperature
value set, even when there are variations in pressure caused by
the drawing of hot and cold water by the various users, or when
there are variations in the temperature of either the cold or hot
water at the inlet.

In domestic hot water heating systems with
accumulator, water must be kept at a minimum
temperature of 60°C in order to totally prevent the
growth of the bacteria that causes a very dangerous
infection called Legionnaire’s disease.
Water cannot be used directly at this temperature
because it can cause burns. The installation of a
thermostatic mixer is recommended to ensure that
water is safe to use. The mixer keeps the preset value
constant when there are variations in temperature
and pressure at the inlet.
The graph at the side of text indicates the degree of
burning that can be caused depending on water temperature and heat exposure time. The mixer solves this problem
by interrupting the flow of hot water when the flow of cold water is missing at the inlet.

MATERIALS
Body: Brass CW 617 N – UNI EN 12165
Large screw: Brass CW 617 N – UNI EN 12165
Springs: Stainlass Steel
Lock nut: PA6
Hand wheel: PA6
O-Ring: EPDM PEROX – (high resistance)
NON-RETURN VALVE MATERIALS
Body: Brass CW617N – UNI EN12165
O-Ring: EPDM PEROX – (high resistance)
Spring: Stainlass Steel
PERFORMANCE
Fluid used: water
Max percentage of glycol: 50%
Temperature range: 30-60°C
Factory calibration: 38 ±2°C
Max operating pressure (static): 10 bar
Max operating pressure (velocity): 5 bar
Max temperature at inlet: 85°C
Max ratio between C/F or F/C pressures: 2:1