York YVAA, Installation, Operation & Maintenance Instructions Manual, Page: 148 / 178

JOHNSON CONTROLS
148
SECTION 8 - MICROPANEL
FORM 201.28-NM1.1
ISSUE DATE: 1/31/2018
Low Ambient Cutout
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
LOW AMBIENT TEMP CUTOUT = XXX.X °F
The low ambient temp cutout allows programming the
outdoor temperature at which it is desired to shut down
the chiller to utilize other methods of cooling.
The cutout is programmable between -18.9°C (-2.0°F)
and 10.0°C (50°F) with a -3.9°C (25°F) default.
Low Leaving Liquid Temp Cutout
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
LEAVING LIQUID TEMP CUTOUT = XXX.X °F
The leaving chilled liquid temp cutout is programmed
to avoid freezing the evaporator due to excessively low
chilled liquid temperatures. The cutout is automatically
set at 2.2 °C (36°F) in the Water Cooling mode and is
programmable in the Glycol Cooling mode. In the Gly-
col Cooling Mode, the cutout is programmable from
-11.7°C to 2.2°C (11.0°F to 36.0°F) with a default of
2.2°C (36.0°F).
Motor Current Limit
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
MOTOR CURRENT LIMIT = XXX % FLA
The motor current limit %FLA is programmable. This
allows the microprocessor to limit a system before it
faults on high current. Typically, the limit point is set
at 100%. The unload point is programmable from 30 to
100% with a default of 100%.
Pulldown Current Limit
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
PULLDOWN CURRENT LIMIT = XXX % FLA
The pulldown current limit %FLA is programmable.
This allows the microprocessor to limit a system on
pulldown limiting for the purpose of peak time ener-
gy savings. Typically, the limit point is set at 100%.
The pulldown limit point is programmable from 30 to
100% with a default of 100%. Be aware when using
pulldown motor current limit, the chiller may not be
able to load to satisfy temperature demand.
Pulldown Current Limit Time
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
PULLDOWN CURRENT LIMIT TIME = XXX MIN
The pulldown current limit time is programmable.
This allows the microprocessor to limit a system on
pulldown limiting for a defined period of time for the
purpose of peak time energy savings. The pulldown
limit point is programmable from 0 to 255 with a
default of 0 Min.
Subcooling Setpoint
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
SUBCOOLING SETPOINT = XXX.X °F
The liquid subcooling superheat setpoint is program-
mable from 0.0 to 11.1°C (0.0 to 20.0°F) with a 2.8°C
(5.0°F) default. Typically the subcooling control will
be programmed for 2.8°C (5.0 °F).
Unit ID Number
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
REMOTE UNIT ID NUMBER = X
For purposes of remote communications, multiple
chillers may be connected to an RS-485 communica-
tions bus. To allow communications to each chiller, a
chiller ID number may be programmed into memory.
On a single chiller application, the value will be “0”.
Sound Limit Setpoint
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
SOUND LIMIT SETPOINT = XXX %
The sound limit setpoint is programmable from 0 to
100 % with a 0% default. 0% allows operating up to the
full speed capability of the unit with no sound limiting.
Typically the sound limit control setting will be pro-
grammed for 0 % unless sound limiting is utilized on
the chiller. Sound limiting will only permit the unit to
run to a frequency less than the maximum speed capa-
bility of the unit. Programming a value of 1% would be
the minimum sound limiting that can be programmed
and 100% will be the maximum. 100% will only allow
the unit speed to operate at the minimum frequency.
Usually, the sound limit % will be programmed some-
where between 0 and 100% according the limiting
needed to satisfy the sound requirements of the site.
Typically, sound limiting will be utilized in areas sensi-
tive to noise during night-time hours. The sound limit
display will only be present if the sound limit option is
programmed at the factory.
Eductor Differential
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
EDUCTOR DIFFERENTIAL = XXX °F
The eductor temperature differential is programmable
from 0°C to 10.0°C (0°F to 50.0°F). The default value
is 5.0°F.