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Mitsubishi Electric CAHV-P500YA-HPB Service Handbook Page 90

Hot water heat pump.
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[ VII Control ]
-7- LEV in the main circuit
Operating range of the LEV
The opening range of the LEV is between 100 and 2000 (fully open).
LEV operation speed
Open
133 plus/sec
Close
200 plus/sec
At startup
For one minute and thirty seconds after startup, the valve will be fixed to the Initial Setting.
During operation
Ninety or more seconds after startup, the LEV opening will be controlled every 30 seconds according to the changes in com-
pressor frequency, pressure, and temperature.
The LEV will be controlled to keep the shell bottom SH in the range between 20 and 25K.
If the outside temperature reaches 17ºC or above, the MOP function will be triggered to keep the low pressure from rising too
high.
(The LEV opening will be decreased to keep the low pressure at or below 1 MPa.)
When the outside temperature is high and the water temperature is low (water temperature below 35ºC), the function to keep
the low pressure from rising too high will trip.
(The LEV opening will be decreased so that the compression ratio of 1.5 or above will be maintained.)
Refrigerant Recovery Control
-8- Operation during power failure
Duration of power failure 20 ms or shorter
Detection of power failure
Operation during power failure
Operation
Automatic restoration
after power is
after power failure is set
restored
to "Enabled" (SW3-2 is
set to ON.)
Automatic restoration
after power failure is set
to "Disabled" (SW3-2 is
set to OFF.)
HWE10060
20 ~ 200ms
Undetectable
Instantaneous power
failure
Normal
During an instanta-
operation
neous power failure,
the unit will be con-
trolled according to
the input status of
the circuit board im-
mediately before the
instantaneous power
failure.
Normal
The circuit board will
operation
start receiving input.
- 83 -
200 ms or longer
Detection of power failure
All outputs will be turned off immedi-
ately after power failure.
The unit will be controlled according to
the input status of the circuit board im-
mediately before the power failure, ex-
cept that the input status of the dry
contact after the power is restored will
override the one before the power fail-
ure. For three minutes after the power
is restored, the unit will not operate.
The unit will stop, displaying the error
code for power failure.
The error will be cleared when the op-
eration command signal is off.
GB

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