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CHECKING/SERVICING THE MIXING VALVE:
• Note that this thermostatic mixing valve is a SAFE-
TYVALVE. It does not require routine maintenance
but should be checked annually to be sure it is func-
tioning properly. For installations with poor or
unknown water quality, or other adverse supply con-
ditions, it may be necessary to check the valve a
tmore frequent intervals.
• The temperature should be checked at the same out-
let as was used for commissioning in the first
instance. If the temperature is more than 5°F from
the commissioning temperature, refer to fault finding
guide below.
• There may be some variation in the temperature of
the water from the thermostatic mixing valve due to
seasonal temperature variations in the cold water
supply.
• The check valve can be easily accessed for cleaning
via the flexible hose connection.
• If the water supply is of poor or unknown quality
filters or strainer should be fitted at the inlet to
the system such that the cold inlet to both the
water heater and the mixing valve are protected
from dirt and debris.
TROUBLESHOOTING:
This troubleshooting table is intended as a helpful guide and is not all inclusive. There could be other causes and solutions.
FAULT / SYMPTOM
1. The desired mixed water temperature
cannot be obtained or valve is difficult
to set.
2. Mix temperature unstable or changing
over time.
3. Either full hot or full cold water flow-
ing from outlet fixture.
4. No flow from the valve outlet.
5. Flow rate reduced or fluctuating.
6. Mixed water temperature does not
change when temperature adjuster is
altered.
7. Hot water flows into the cold water
system or vice versa.
8. Valve is noisy.
NOTE: This diagram is a guideline only. Any installation of a
recirculated system should be undertaken by a qualified trades-
man, and in accordance with the relevant codes and State,
Provincial and Local Authority requirements. Performance of the
system will be dependent on the other components specified
within it.
CAUSE
• Inlet temperatures are not within speci-
fication limits.
• Hot and cold supplies are reversed.
• Strainers are blocked.
• Strainers are blocked.
• Fluctuating supply pressures.
• Valve is incorrectly set.
• Hot and cold supplies are reversed.
• Hot/Cold water has migrated to other
inlet.
• Refer also to point 1.
• Hot or cold water supply failure.
• Strainers are blocked.
• Strainers are blocked.
• Fluctuating supply pressures.
• Hot and cold supplies are reversed.
• Check valves fouled.
• Excessive water velocity.
• Valve sized incorrectly.
POSSIBLE SOLUTION
• Ensure inlet temperatures are within
the specified limits for the valve.
• Refit the valve with Hot/Cold supplies
fitted to the correct connections.
• Clean strainers.
• Clean strainers.
• Install pressure regulating valves on
both hot and cold supplies.
• Adjust mix temperature as required.
• Refit the valve with Hot/Cold supplies
fitted to the correct connections.
• Verify the check valve is not fouled.
Clean if necessary.
• Restore inlet supplies and check mix
temperature.
• Clean strainers.
• Clean strainers.
• Install pressure regulating valves.
• Refit the valve with Hot/Cold supplies
fitted to the correct connections.
• Clean check valves, ensuring debris is
removed.
• Reduce water velocity (best achieved
by fitting a pressure regulating valve).
• Check valve specifications and ensure
the appropriate valve is used for
required flow.
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