Kohler rada 425 Manuel Du Produit page 8

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Make sure that the item is installed by a competent installer.
Shut off the main water supply.
Observe all local plumbing and building codes.
Provided that the thermostatic mixing valve is installed,
commissioned, operated within the specification limits and
maintained according to this Manual, the risk of malfunction,
if not eliminated, is considerably reduced.
The use of the word 'failsafe' to describe the function of a
thermostatic mixing valve is both incorrect and misleading.
In keeping with every other mechanism it cannot be
considered as being functionally infallible.
Malfunction of thermostatic mixing valves is almost always
progressive in nature and will be detected by the use of
proper temperature checking and maintenance routines.
Certain types of system can result in the thermostatic
mixing valve having excessive 'dead-legs' of pipework.
Others allow an auxiliary cold water supply to be added to
the mixed water from the mixing valve. Such systems can
disguise the onset of thermostatic mixing valve malfunction.
Ultimately, the user or attendant must exercise due diligence
to ensure that the delivery of warm water is at a stable, safe
temperature. This is particularly important in such healthcare
procedures as supervised bathing of patients unable to
respond immediately to unsafe temperatures.
Specification
Pressures
Minimum Dynamic Supply Pressure: 0.1 bar
Maximum Dynamic Pressure: 3.5 bar
Maximum Supply Static Pressure: 10 bar
Maximum pressure loss ratio*: should not exceed 10:1 in
favour of either supply during flow.
Maximum pressure loss: inlets to outlet is 3.5 bar, which
equates to maximum 200 l/min flow rate at mid blend.
Note! Pressure loss is the pressure drop between the inlets
and the outlet of the mixing valve when flow is taking place.
* 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.
1233168-W2-A
General
Safety
Connections
425 IC - Inlets & outlet connections: 28mm compression.
425 IF - Inlets & outlet connections: 1" BSP female thread.
425 F - Inlet & outlet adaptors 1" BSP female thread.
425 M - Inlet & outlet adaptors 1 ¼" BSP male thread.
Temperature
Minimum Cold Water Temperature: 1°C
Maximum Hot Water Temperature: 85°C
Thermostatic Control Range: 25°C - 60°C
Optimum Thermostatic Control Range: 35°C - 46°C
Flow Rates
Minimum Flow Rate: 8 l/min at mid blend with nominally
equal supply pressures.
Maximum Flow Rate: 200 l/min
Troubleshooting
Only hot or cold water from outlet
a. Inlet supplies reversed (i.e. hot supply to cold inlet).
Check.
b. Check filters and inlet fittings for blockage.
Fluctuating or reduced flow rate
a. Check filters and inlet / outlet fittings for flow restriction
(check isolators are fully open).
b. Ensure that minimum flow rate is sufficient for supply
conditions.
c. Ensure that dynamic inlet pressures are nominally
balanced.
d. Ensure that inlet temperature differentials are sufficient.
No flow from mixing valve outlet
a. Check inlet isolators are fully open.
b. Check filters and inlet / outlet fittings for blockage.
c. Hot or cold supply failure.
Maximum blend temperature setting too hot or too cool
a. Indicates incorrect temperature setting.
For full instructions, see Product Manuals on the
website at www.radacontrols.com
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