Mitsubishi Electric PURY-P72 Service Handbook page 160

[VII Control]
(2) Heating operation
1. Indoor/outdoor unit fan control
2. Inverter frequency control
3. Indoor unit LEV lully open
4. Solenoid valve control
5. BC controller solenoid valve control
6. BC controller LEV control
NO
,------------------
I
I
I
I
I
: YES
~-----------------
I
I
I
I
1. Indoor unit fan operation at
Very Low speed
2. Inverter outpul
OHz
3. Indoor unil LEV lully open
4. Solenoid valve OFF
5. Outdoor unit fan stop
6. BC controller solenoid valve control
7. BC controller LEV control
YES
----,
,
, ,
, ,
, ,
-------,
- - - Normal operation
- - - Defrost operation
Unit in the stopped state
- - - - - During test run mode
1. Indoor unit fan stop
2. Inverter defrost frequency control
3. Indoor unit LEV lully open
4. Solenoid valve control
5.
Outdoor unit fan stop
6. BC controller solenoid valve control
7. BC controller LEV control
I_----------------------~I
....I------------------'
00
"Note
1.
When the outdoor unit goes into the defrost mode, defrost command is sent to the BC controller and indoor units.
Upon reception of the command, the indoor units
will
go into the defrost mode. When defrosting is completed and
upon receiving the signal that indicates the completion of defrosting, indoor units will resume the heating operation.
"Note
2.
Defrost end condition:
10
or more minutes must pass after defrost operation.
or Outdoor unit piping temperature: refer to "-7-. Defrost operation control" of [2] Controlling the Outdoor
Unit.
HWEOB03A
- 150- GB