8
Temperatures
Optimum Thermostatic Control Range: 35 - 46
o
C.
Recommended Minimum Cold Water Temperature: 1
o
C.
Recommended Maximum Hot Water Temperature: 85
o
C.
0
1
2
3
4
5
0
200
150
100
50
250
Pressure Loss - bar
Flo
w Rate - Litres/Min
Hydraulic Restriction: Flow Rate Pressure Loss Graph
(mixing valve only, equal dynamic supply pressures and mid-blend temperature
setting, rising or falling pressure loss).
Optimum performance is obtained when
temperature differentials of 20
o
C
or more
exist between blend and either supply. Blend control accuracy will begin to diminish at
temperature differentials below
12
o
C
.
Blend Temperature Range: between ambient cold and approximately 60
o
C
,
according to hot water supply temperatures.
Thermostatic Control Range: approximately 25-60
o
C.
Note!
If the hot water supply system does not incorporate safety devices (e.g. non self
resetting thermal cut out) to prevent this temperature being exceeded then the use of
a tempering valve may be considered to limit the temperature of the water supplied to
the mixing valve. The output temperature of this tempering valve must be set to a value
not less than 60
o
C and it must not exceed 85
o
C if the hot water supplied to it reaches
the maximum possible value which may occur under fault conditions in the hot water
apparatus.
*
Pressure Loss Ratio is determined by subtracting the resistance of the outlet
pipework and outlet fittings from the dynamic pressures of the hot and cold
water at the inlets of the mixing valve. This is at its extreme when the mixing
valve is used at its lowest flow-rate and when the maximum inequality occurs in
the pressure of the hot and cold water supplies.
Summary of Contents for 425-t3
Page 37: ...37 SPARE PARTS...
