Operating Instructions and Installation Guide
Tri - System
Page 4
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It is normal and desirable that this valve allows a small quantity of water to be discharged
during the heating cycle. It should be put a properly drained safe-tray under heaters located
where leakage may cause damage. If it discharges more than a bucket of water during a 24
hour period or discharges continuously there may be another problem.
If the valve dribbles continuously, try easing the valve gear for a few seconds as described
above. This may dislodge any foreign matter and alleviate the problem.
If the valve discharges at high flows, especially at night, it may be as a result of the water
pressure exceeding the design pressure of the water heater. Ask your installer to fit a Pressure
Limiting Valve (PLV).
5.2 Expansion Control Valve (ECV)
It is normal and desirable that this valve allows a small quantity of water to be discharged
during the heating cycle. If it discharges more than a bucket of water during a 24 hour period or
discharges continuously there may be another problem. If the valve leaks continuously, try
easing the valve gear for a few seconds. This may dislodge any foreign matter and alleviate
the problem.
Operate the easing gear regularly to remove any lime deposits and to verify that it is not
blocked.
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