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8.4.1 EHS in Replacement mode
The EHS is activated for Heating to replace the compressor, if the compressor is unable to meet demand as it has
sh ut down for one of the following reasons:
HP unit stopped (according of operating limits)
Probe faults (see lists below)
For Heating system water production, the EHS will be controlled using the same control as the compressor in
Heating mode.
Must be allowed to define the Outdoor air temperature below which the space Heating will be heated by EHS
according the explanation. Parameter to define whether the EHS is “always enabled” or “enabled only if the
Outdoor air temperature” is below the value set in parameter “Outdoor air temperature to enable EHS”.
When the Outdoor air temperature drops below the “Outdoor air temperature” the HP unit will stop automatically
and the permission signal for the EHS becomes active.
When probe faults occurred, The EHS is activated for;
Error code/name
Heating
DHW
P3
Refrigerant High Pressure switch Failure
ON
ON
FU
Refrigerant High Pressure switch Operation
ON
ON
A6
Sensor (temp. Suction)
ON
ON
A7
Sensor (temp. Defrost)
ON
ON
A8
Sensor (temp. Discharge)
ON
ON
E5
Sensor (temp. Return water)
ON
ON
L1
Sensor (temp. DHW tank)
ON
OFF
L3
Sensor (temp. Buffer tank)
OFF
ON
L4
Sensor (temp. Mixed water)
OFF
ON
L5
Sensor (Humidity)
OFF
ON
L8
Sensor (temp. Room air, Master Remote controller)
OFF
ON
L9
Sensor (temp. Room air, Slave Remote controller)
OFF
ON
(5.0°C)
enable EHS
and disable compressor
(-5.0°C)
hysteresis
Outdoor air temperature
(Selected by Par5109)
EHS ON
OFF
Compressor ON
OFF
8. Domestic Hot Water Production
Summary of Contents for AEYC-0639U-CH
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