Mitsubishi Electric CAHV-R450YA-HPB Service Manual page 109

[ VII Control ]
-7- LEV in the main circuit
Operating range of the LEV
The opening range of the LEV1 is between 100 and 2000 (fully open).
The opening range of the LEV3 is between 41 and 3000 (fully open).
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.
Refrigerant R ecovery 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" (SW6-2 is
set to ON.)
Automatic restoration
after power failure is set
to "Disabled" (SW6-2 is
set to OFF.)
HWE22020
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.
- 100 -
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