York YLPA 0115SE, Installation, Operation And Maintenance Manual

Page: 49 / 90

49
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
DISPLAY UNITS
IMPERIAL
DISPLAY UNITS
SI
Display messages can be shown in Imperial units (°F or
PSI) or SI units (°C or Bar).
If the DISPLAY UNIT setting under the
OPTION key is changed with a Remote
Device connected, the power to the unit
must be switched OFF and ON again.
Failure to do this may result in erroneous
data being transmitted.
LEAD / LAG CONTROL
MANUAL SYS 1 LEAD
LEAD / LAG CONTROL
MANUAL SYS 2 LEAD
LEAD / LAG CONTROL
AUTOMATIC
System1 or system 2 can be selected as the lead system
under manual or the microprocessor will determine
which system is assigned to the lead / lag under
automatic. A new lead/lag assignment is made whenever
all compressors are shut down in automatic. The
microprocessor will then assign the lead to the system
compressor with the shortest average run time.
MANUAL OVERRIDE MODE
DISABLED
MANUAL OVERRIDE MODE
ENABLED
This option allows the programmed daily schedule to be
overridden for service tasks when the mode is enabled.
It will automatically be disabled after 30 minutes.
POWER FAIL RESTART
AUTOMATIC
POWER FAIL RESTART
MANUAL
If automatic is set, the unit will restart automatically
after a power failure with the unit anti recycle timers
counting down from 120 seconds.
If manual is set then after a power failure the status
message will read UNIT FAULT: 115VAC UNDER
VOLTAGE. To restart the unit, the unit switch (under
the key pad) must be set to OFF then back to ON.
SOFT START
ENABLED
This message must only be displayed when the unit
is fitted with soft starters. On units not fitted with soft
start the message will not be displayed. If the option is
incorrect, contact your local YORK / Johnson Controls
service office.
UNIT TYPE
HEATPUMP
This option is factory set and should always read HEAT
PUMP. If a unit type other than heat pump is displayed,
with the power OFF, check that a 6.2Kohm resistor is
correctly installed on the microprocessor board across
J11 pins 7 and 12. Switching the power ON with the
resistor fitted will reboot the software to have a UNIT
TYPE HEAT PUMP.
REFRIGERANT TYPE
R-410A
This option is factory set and should always read
R-410A. If the refrigerant type is incorrect contact your
local YORK / Johnson Controls service office.
FLASH CARD UPDATE
DISABLED
This message should read DISABLED. Do not change
to ENABLED.
REMOTE TEMP RESET
INPUT DISABLED
REMOTE TEMP RESET
INPUT 0.0 TO 10.0 V
REMOTE TEMP RESET
INPUT 2.0 TO 10.0 V
REMOTE TEMP RESET
INPUT 0.0 TO 20.0 MA
REMOTE TEMP RESET
INPUT 4.0 TO 20.0 MA