Operation Flow Chart; Mode Determination Flowchart - Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook

[ VII Control ]

[4] Operation Flow Chart

1. Mode determination flowchart <PQHY>
(1) Indoor unit (cooling, heating, dry, fan mode)
Start
Breaker
turned on
Operation SW
turned on
1. Protection function
self-holding cancelled.
2. Indoor unit LEV fully closed.
Remote controller
display lit off
YES
Auxiliary heater
ON
1. Auxiliary heater OFF
FAN stop
2. Low fan speed for
1 minute
YES
Drain pump
ON
3-minute
drain pump ON
*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 heat source 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 heat source 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 heat source unit.
HWE09080
NO
YES
From heat source unit
1
YES
NO
*Note 1
*Note 2
NO
Error mode
YES
Error stop
NO
Error display Cooling mode
Self-holding of
Cooling display
protection function
Error command
to heat source unit
Prohibition
Indoor unit LEV
NO
fully closed.
*Note 1
Refer to 2-(1)
Cooling operation.
Normal operation
Error
Unit in the stopped state
Operation mode
Heating mode Dry mode
Heating display
Dry display
*Note 3 *Note 3
YES YES
Prohibition Prohibition
NO NO
Refer to 2-(2) Refer to 2-(3)
Heating operation. for dry operation.
Prohibition
"Blinking display on
the remote controller"
Operation command to heat source unit (to 2 )
- 161 -
Fan mode
Fan display
*Note 3
YES
NO
Fan operations
GB