Panasonic U-100PEY1E5, Technical Data & Service Manual, Page: 576 / 739

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9) Outdoor Unit Fan Control
The appropriate rotations per minute for the outdoor unit fan are determined in accordance with the ambient
temperature and the frequency of the compressor inverter.
The outdoor unit fan step is controlled between a range of W1 (Step 1) and WF (Step 15).
10) Outdoor Unit's Electrical Expansion Valve Control
The electrical expansion valve controls the amount of refrigerant that is allowed to flow in accordance with the
operation status.
The valve is adjusted in accordance with the discharge temperature (TD), the outdoor heat exchanger
temperature sensor (C1), the suction temperature sensor (TS), and the indoor unit's heat exchanger
temperature sensors (E1 and E2).
(1)
Controlled so that the suction temperature (TS) - indoor heat exchanger temperature minimum (E1 and E2)
is between 1 degree and 5 degrees under normal conditions.
There are cases where the aperture opens wider than usual if the discharge temperature increases.
(2)
Cooling Mode
Heating Mode
Controlled so that the suction temperature (TS) - outdoor heat exchanger temperature (C1) is between
0 degree and 5 degrees under normal conditions.
There are cases where the aperture opens wider than usual if the discharge temperature increases.
11) Demand Control
There are two styles of demand operations available as methods of restraining power consumption.
(1)
Demand input from an external source is carried out from the outdoor unit EXCT (CN026) PCB or the
outdoor unit's serial/parallel I/O (optional).
• Demand control with EXCT input
Short-circuit
Control (range of operations)
2P and 3P 1P and 3P
0 0
1 0
1 1
No ristricted
0 1 Rated current restricted to A% (A% = 100% at factory shipment)
Rated current restricted to B% (B% = 70% at factory shipment)
Control OFF
* The operational current is restricted to either A% or B% as a general indicator during demand input.
•
•
•
A% and B% can be amended in calibrations of 5% between 70% and 100% with the outdoor unit's
maintenance remote controller.
For details on how to amend the parameters, see the chapter on the outdoor maintenance remote
controller, (refer to the section "6-6. Settings Modes : Setting the Outdoor Unit EEPROM").
A% value amendments: Parameters are amended with item code "50" (demand 1).
B% value amendments: Parameters are amended with item code "51" (demand 2).
(2)
Demand via External Input
Demand Control with No External Input
Demand control is carried out proportionally with the normal settings from the outdoor unit without any
external input.
• Amendments can be made in calibrations of 5% between 0% and 100%.
Refer to the section "6-6. Settings Modes : Setting the Outdoor Unit EEPROM" for the outdoor
maintenance remote controller for details on how to amend the parameters.
Parameters are amended with item code "52" (current control level).
Ending Defrosting
Defrosting operations are ended when the following conditions are satisfied.
• Ending defrosting conditions
(a)
(b)
(c)
When the temperature of the outdoor heat exchanger temperature sensor (C1) is 12°C or higher.
When the temperature of the outdoor heat exchanger temperature sensor (C1) is 7°C or higher for consecutive
60 seconds.
When a maximum of 15 minutes defrosting time has elaped.
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