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YORK INTERNATIONAL
60
MICRO LOGIC BOARD JUMPERS/SWITCHES
The Micro Logic Board can be configured for various
types of systems (4 stage vs. 6 or 8 stages of unload-
ing) and several options (Remote/Local Control and
RWT/LWT Control). These options are available on
REV. B and REV. C Micro Logic Boards. REV. C also
allows for panel selectable Lead/Lag (Lead/Lag Switch)
versus automatic time sharing of lead/lag by the Micro,
which will equalize compressor run times.
REV. B boards actually utilize three jumpers for these
options (J8, J9, and J10). REV. C boards replace the
jumpers with a Dip Switch which has 7 miniature rocker
switches built into a single pack. 4 of the 7 switches are
active. An explanation of the Jumpers/Switches on the
Micro Logic Board is provided on this page and page 61.
(YCHA120, 150, 175 & 200)
MICRO LOGIC BOARD JUMPER OPTIONS
(REV. B BOARDS)
Three jumpers are available for the options on the Rev.
B Micro Logic Board.
J8: Selects 4 or 8 Stage Control
OUT: 4 Stage
IN: 8 Stage
J9: Remote Temperature Setpoint Reset and Remote
Unloading
OUT: Local (Panel Control Only)
IN: Remote (Remote Control of Temperature
Setpoint Reset and Unloading. You must have a
Digital Input Board to use Remote Control.)
J10: Selects RWT or LWT Control
OUT: RWT Control
IN: LWT Control
NOTE:J8 must be placed
IN if optional 6 or 8 stages
of unloading is present.
See Figure below for J8, J9, and J10 location.
NOTE: Use on LWT
Control Only if 6 or 8
stages of unloading is
present.
FIG. 20 – MICRO LOGIC BOARD JUMPERS (REV. “B” BOARD)
00011TG
J8
J10
J9