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B/O CIRCUIT BOARD OPTION (FOR HEAT PUMP APPLICATIONS): This setting is a
plastic shorting cap (called a jumper) which determines the operation of the
shared B/O wire terminal connection. This jumper must remain installed for a
Heat Pump system to be able to provide heating and cooling as needed, and the
majority of heat pumps today use the default “O” setting. The symptoms that will
occur if this setting is not correct will be: heating while in cool mode, and
cooling while in heat mode.
When this is set to “O” (factory default), the shared B/O terminal will be turned
on while in COOL mode, and off in HEAT mode.
When this is set to “B” (which is needed for some Rheem, Ruud, and Bard heat
pumps), the shared B/O terminal will be turned on in HEAT mode, and off in COOL
mode
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“O” OPTION
(default)
“B” OPTION
JP2
C
G
RH
RC
W
Y
B/O
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