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UNITS 257 / 307 – COMMENTS
• S002 rotary switch (10 positions, black) / S003 DIP switches (2P, blue):
Address for split air to air units – not used for the application.
The factory setting below must not be changed :
• CN047 Auto address plug (2P, white):
Normally, the addressing sequence between refrigerant circuit power board A3 and control board A2 takes place when power is
initially turned on at the factory.
In case of board replacement or problem of communication on the field, it can be necessary to launch again an addressing
sequence. For that, short circuit the pins of the plug.
During automatic address setting, LEDs 1 & 2 are blinking alternatively (open circuit these pins stops automatic address
setting).
After the power is turned ON, automatic address setting will not be functioned for over 1 minute and 30 seconds.
• CN048 Pump down plug (2P, white):
Used for split air to air units for refrigerant recovery sequence – not used for the application.
• CN039 RC-P Service remocon connection plug (5P, red): See PART 6
• CN033 Test plug (2P, red): Used for PCB inspection in factory.
• CN038 MODE plug (2P, white): Not used.
• CN501 ROM plug (4P, white):
Used for PCB software loading in factory with “PAC checker” interface.
• CN030 EXCT plug (3P, red): Designed for capacity control – not used.
• CN037 SILENT (or QUIET) MODE plug:
Software version:
Unit Version Date
257 (8HP)
V110
Jan. 2012
307 (10HP)
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