Panasonic CU-5E36QBU-5, Service Manual

Page: 46 / 218

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13.15 Valve close detection control

This control detects 3-way valve close condition to prevent damage to refrigerant cycle.

Start conditions:
o
For all connected indoor units, if Indoor intake temperature — indoor piping temperature are between 28.4°F
(-2°C) and 35.6°F (2°C) continuously for 5 minutes after compressor ON at first cooling operation.
o
The first cooling operation is defined as cooling operation is ON for less than 8 minutes after new installation
or after pump down.

Control content
o
During this control, compressor stop, indoor units’ Timer LED will blink. (“F91” is indicated at indoor units)

Error reset can be done by power supply reset or reset by using remote control.
13.16 Compressor discharge high pressure protection control

This control protect by using high pressure switch during operation.

Start conditions
o
High pressure switch is activated (from normally close to open) when outdoor operation mode is cooling or
heating during compressor running.

Control 1 content
o
Compressor stop when high pressure switch is opened and restart after high pressure switch closed. If this
condition happen 4 times within 30 minutes, “F94” is indicated.
o
After 30 minutes, counter is reset if this condition does not happen for 4 times.

Control 1 stop conditions
o
Power supply reset
o
Reset by using remote control