Trane TVR Pro CO Series Service Manual page 44

2.2 Components
Layout
Figure 5-2.2: Outdoor unit main PCB components
Dial switches
DSP2
Digital
display
DSP1
Function of buttons SW3 to SW6
Table 5-2.2: Function of buttons SW3 to SW6
Button
SW3 (UP)
SW4 (DOWN)
SW5 (MENU)
SW6 (OK)
Buttons
Function
In menu mode: previous and next buttons for menu
modes.
Not in menu mode: previous and next buttons for
system check information.
Enter / exit menu mode.
Confirm to enter specified menu mode.
Main control chip
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