General Symptoms - EAS ELECTRIC EMCH Serie Manual De Instrucciones

14.2 General symptoms

Symptom 1: The unit is turned on but the unit is not heating or cooling as expected
POSSIBLE CAUSES
The temperature setting is not
correct.
The water flow is too small.
The water volume in the
installation is too small.
Symptom 2: The unit is turned on but the compressor is not starting
POSSIBLE CAUSES
The unit maybe
operate out of its
operation range (the
water temperature is
too low).
Symptom 3: Pump is making noise (cavitation)
POSSIBLE CAUSES
There is air in the system.
Water pressure at
pump inlet is too
small.
Symptom 4: The water pressure relief valve opens
POSSIBLE CAUSES
The expansion vessel is broken.
The filling water pressure in
the installation is higher
than 0.3MPa.
Symptom 5: The water pressure relief valve leaks
POSSIBLE CAUSES
Dirt is blocking the
water pressure relief
valve outlet.
CORRECTIVE ACTION
Check the parameters (T4HMAX, T4HMIN in heating mode; T4CMAX,
T4CMIN in cooling mode). For the parameter setting range, please
refer to 11.1 Setting parameters.
• Check that all shut off valves of the water circuit are in the
right position.
• Check if the water filter is plugged.
• Make sure there is no air in the water system.
• Check the water pressure.
The water pressure must be≥1.5 bar.
• Make sure that the expansion vessel is not broken.
Make sure that the water volume in the installation is above
the minimum required value. Please refer to 9.3.2
volume and sizing expansion vessels.
CORRECTIVE ACTION
In case of low water temperature, the system utilizes the backup
heater to reach the minimum water temperature first (12°C).
• Check that the backup heater power supply is correct.
• Check that the backup heater thermal fuse is closed.
• Check that the backup heater thermal protector is not
activated.
• Check that the backup heater contactors are not broken.
CORRECTIVE ACTION
Purge air.
• Check the water pressure.
The water pressure must be ≥1.5 bar.
• Check that the expansion vessel is not broken.
• Check that the setting of the pre- pressure of the
expansion vessel is correct.
CORRECTIVE ACTION
Replace the expansion vessel.
Make sure that the filling water pressure in the
installation is about 0.10~0.20MPa.
CORRECTIVE ACTION
• Check for correct operation of the pressure relief valve by
turning the black knob on the valve counter clockwise:
• If you do not hear a clacking sound, contact your local dealer.
• In case the water keeps running out of the unit, close both the
water inlet and outlet shut-off valves first and then contact
your local dealer.
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Water
V.1