YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls

FORM 201.28-NM1.1
ISSUE DATE: 8/29/2012
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 Glycol
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 energy
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.
SECTION 8 - MICROPANEL
Subcooling Setpoint
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
SUBCOOLING SETPOINT = XXX.X °F
The liquid subcooling superheat setpoint is programmable
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 communications
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 programmed
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 capability
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 somewhere
between 0 and 100% according the limiting
needed to satisfy the sound requirements of the site.
Typically, sound limiting will be utilized in areas sensitive
to noise during night-time hours. The sound limit
display will only be present if the sound limit option is
programmed at the factory.
JOHNSON CONTROLS 115
8