Panasonic U-2E15GBE / U-2E18CBPG Service Manual ▷ View online
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13.4. Protection Control for All Operations
13.4.1.
Time delay safety control
• The compressor does not restart for 3 minutes after stop of compressor.
13.4.2.
Total running current control
• When the air conditioner has been operated at the capacity designated by the indoor unit and the total running current exceeds
setting I1, the operating frequency of the compressor is reduced. Conversely, when the total current drops below setting I1, it is
increased (but only up to the capacity designated by the indoor unit).
increased (but only up to the capacity designated by the indoor unit).
• The compressor is stopped as soon as the total current exceeds setting I2.
• If the compressor is stop by the total running current control on 3 occasions in a 20-minutes period, the “F98” error is displayed.
• If the compressor is stop by the total running current control on 3 occasions in a 20-minutes period, the “F98” error is displayed.
13.4.3.
IPM (Power transistor) prevention control
Overheating prevention control
• The compressor is stopped when the overheating protection circuit inside the IPM has been activated. It restarts after 3 minutes.
• Activation temperature: 110°C
• Activation temperature: 110°C
Reset temperature: 95°C
DC peak current control
• When the inverter load current (DC peak current) exceeds the setting value (22.5A), the compressor is stopped immediately. If
this happens within 30 seconds after it started operating, it will restart one minute later; if it happens after 30 seconds have
elapsed since it started operating, it will restart 3 minutes later.
elapsed since it started operating, it will restart 3 minutes later.
• If the DC peak current exceeds the setting value on 7 consecutive occasions within 30 seconds after the compressor started
operating, the “F99” error is displayed, and the unit operation is stopped.
13.4.4.
Compressor Overheating Prevention Control
• When the compressor discharge temperature exceeds 105°C, compressor frequency control (including expansion valve control)
is conducted.
• If the compressor stops when compressor discharge temperature exceeds 112°C for 3 occasions within 30 minutes, TIMER
LED blinks (F97: Compressor overheat).
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13.4.5.
Low Pressure Prevention Control (Gas Leakage Detection)
• Control start conditions
- For 5 minutes, the compressor continuously operates and outdoor total current is between 1.5A and 1.88A.
- During Cooling and Soft Dry operations:
- During Cooling and Soft Dry operations:
- Indoor heat exchanger temperature is above 20°C
- During heating operations:
- Indoor heat exchanger temperature is below 25°C.
• Control contents
- Compressor stops (and restart after 3 minutes).
- If the conditions above happen 2 times within 20 minutes, the unit will:
- If the conditions above happen 2 times within 20 minutes, the unit will:
- Stop operation
- Timer LED blinks and “F91” indicated (Refrigeration cycle abnormality).
- Timer LED blinks and “F91” indicated (Refrigeration cycle abnormality).
13.4.6.
4-Way Valve Failure Protection Control
• During Cooling operation
- 4 minutes after compressor started, if the temperature of the indoor unit heat exchanger exceeds 45°C, the compressor stops
(After 3 minutes, Time delay safety control starts).
- If this situation occurs 4 times within 30 minutes, TIMER LED blinks (F11 error).
• During Heating operation
- 4 minutes after compressor started, if the temperature of the indoor unit heat exchanger drops below 5°C, the compressor
stops (After 3 minutes, Time delay safety control starts).
- If this situation occurs 4 times within 30 minutes, TIMER LED blinks (F11 error)
13.5. Protection Control for Cooling & Soft Dry Operation
13.5.1.
Cooling overload control
• Detects the outdoor pipe temperature and carry below restriction/ limitation (limit the compressor operation frequency).
• If the outdoor heat exchanger temperature exceeds 52°C during cooling / dry operation, the compressor frequency is restricted.
• If the compressor if outdoor pipe temperature exceeds 62°C.
• If the compressor stops 4 times within 20 minutes, TIMER LED blinks (F95: outdoor high pressure rise protection).
• If the outdoor heat exchanger temperature exceeds 52°C during cooling / dry operation, the compressor frequency is restricted.
• If the compressor if outdoor pipe temperature exceeds 62°C.
• If the compressor stops 4 times within 20 minutes, TIMER LED blinks (F95: outdoor high pressure rise protection).
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13.5.2.
Outdoor air temperature control
• The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.
This control will begin 1 minute after the compressor starts.
13.5.3.
Abnormal Wiring or Piping Connection Checking Control
• 3 minutes after forced cooling operation was conducted for one room during the initial operation after power was turned on. The
abnormal wiring or piping connection control activates when:
- The outdoor gas piping temperature (connected to non operating indoor unit) drops by more than 5°C to 5°C or below 3
minutes after compressor started.
- The non operating indoor unit pipe temperature where outdoor air temperature above 5°C has dropped by more than 20°C to
5°C or lower.
- When above conditions are satisfied, the Timer LED blinks. (H41 error)
13.6. Protection Control for Heating Operation
13.6.1.
Overload Protection Control
• The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown in below
figures.
13.6.2.
Intake Air Temperature Control
• Compressor operating frequency changes in accordance to the outdoor air temperature.
• This control is not applicable during minimum frequency operation protection control, deice operation, pump down operation.
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14 Servicing Mode
14.1. Auto OFF/ON Button
1. AUTO OPERATION MODE
The Auto Operation will be activated immediately once the Auto OFF/ON button is pressed. This operation can be used to
operate air conditioner with limited function if remote control is misplaced or malfunction.
operate air conditioner with limited function if remote control is misplaced or malfunction.
2. TEST RUN OPERATION (FOR PUMP DOWN/SERVICING PURPOSE)
The Test Run Operation will be activated if the Auto OFF/ON button is pressed continuously for more than 5 seconds. A
“beep” sound will be heard at the fifth seconds, in order to identify the starting of this operation (Forced Cooling Operation).
Within 5 minutes after Forced Cooling Operation starts, the Auto OFF/ON button is pressed for more than 5 seconds, 2 “beep”
sounds will occurs at 5th seconds, in order to identify the starting of Forced Heating Operation. The Auto OFF/ON button may
be used together with remote control to set/ change the advance setting of air conditioner operation.
“beep” sound will be heard at the fifth seconds, in order to identify the starting of this operation (Forced Cooling Operation).
Within 5 minutes after Forced Cooling Operation starts, the Auto OFF/ON button is pressed for more than 5 seconds, 2 “beep”
sounds will occurs at 5th seconds, in order to identify the starting of Forced Heating Operation. The Auto OFF/ON button may
be used together with remote control to set/ change the advance setting of air conditioner operation.
3. REMOTE CONTROL NUMBER SWITCH MODE
The remote Control Number Switch Mode will be activated if the Auto OFF/ON button is pressed continuously for more than
11 seconds (3 “beep” sounds will occur at 11th seconds to identify the Remote Control Number Switch Mode is in standby
condition) and press any button at remote control to transmit and store the desired transmission code to the EEPROM. For
transmission code selection explanation, please refer to “Select Remote Control Transmission Code”
11 seconds (3 “beep” sounds will occur at 11th seconds to identify the Remote Control Number Switch Mode is in standby
condition) and press any button at remote control to transmit and store the desired transmission code to the EEPROM. For
transmission code selection explanation, please refer to “Select Remote Control Transmission Code”
4. REMOTE CONTROL RECEIVING SOUND OFF/ON MODE
The Remote Control Receiving Sound OFF/ON Mode will be activated if the Auto OFF/ON button is pressed continuously for
more than 16 seconds (4 “beep” sounds will occur at 16th seconds to identify the Remote Control Receiving Sound OFF/ON
Mode is in standby condition) and press “AC Reset” button and then press “Check” button at remote control.
more than 16 seconds (4 “beep” sounds will occur at 16th seconds to identify the Remote Control Receiving Sound OFF/ON
Mode is in standby condition) and press “AC Reset” button and then press “Check” button at remote control.
Press “Auto OFF/ON button” to toggle remote control receiving sound.
• Short “beep”: Turn OFF remote control receiving sound
• Long “beep”: Turn ON remote control receiving sound
• Long “beep”: Turn ON remote control receiving sound
After Auto OFF/ON button is pressed, the 20 seconds counter for Remote Control Receiving Sound OFF/ON Mode is
restarted.
restarted.
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