Mitsubishi Electric PUHY-P250YJM-A, Service Manual

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VIII
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HWE10190 GB
[3] Operation Flow Chart
1. Mode determination flowchart
(1) Indoor unit (cooling, heating and fan modes)
*Note 1. Indoor unit LEV fully closed : Opening 41.
*Note 2. The system may go into the error mode on either the indoor unit or the outdoor unit side. If some of the indoor units are
experiencing a problem (except water leakage), only those indoor units that are experiencing the problems will stop.
If the outdoor unit is experiencing a problem, all connected indoor units will stop.
*Note 3. The operation will be prohibited when the set cooling/heating mode is different from that of the outdoor unit.
*Note 4. The conditions for switchover between the Fan and Heating modes during the fan operation is as follows:
࡮
SW1-7 is set to ON.
࡮ Fan mode to Heating mode: Outdoor intake temperature ≤ 5˚C
࡮ Heating mode to Fan mode: Outdoor intake temperature ≥ 6˚C
(If SW1-7 is set to OFF, the unit will not switch over to the Heating mode.)
YES
NO
NO
YES
Fan mode
Display of
Fan mode
Fan operation
Heating operation
Refer to 2-(2).
Display of
heating mode
Heating mode
Indoor unit return
air temp ≤ 5˚C
*Note 4
*Note 3
Prohibited
"Prohibit" blinks
on the remote
controller.
Error stop
FAN stop
Remote controller
display lit off
Start
NO
NO
YES
YES
From outdoor unit 1
YES
NO
NO
NO
YES YES
Normal operation
Error
Unit in the stopped state
Operation mode
Cooling mode
Cooling mode
Display of
cooling mode
Cooling operation
Refer to 2-(1). Heating operation
Refer to 2-(2).
"Prohibit" blinks
on the remote
controller.
Display of
heating mode
Heating mode
Breaker
turned on
Operation SW
turned on
1. Protection function
self-holding cancelled.
2. Indoor unit LEV fully closed.
*Note 1
NO
*Note 2
YES
Error mode
Error display
Self-holding of
protection function
Indoor unit return
air temp ≤ 5˚C
Indoor unit LEV
fully closed.
Error command
to outdoor unit
*Note 1
*Note 4
*Note 3
Operation command to outdoor unit (to 2 )
Prohibited Prohibited
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