YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls
YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls
YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls
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SECTION 8 - MICROPANEL<br />
When LOCAL CONTROL mode is selected, chilled<br />
liquid control is from the keypad of the chiller. In local<br />
mode, a remote device can read system data, but not<br />
reset operating parameters.<br />
OPTIONS LOCAL / REMOTE CONTROL MODE<br />
◄ ► LOCAL CONTROL<br />
When REMOTE CONTROL mode is selected, control<br />
of the chilled liquid setpoint is from a remote device<br />
such as an ISN/BAS controller.<br />
OPTIONS LOCAL / REMOTE CONTROL MODE<br />
◄ ► REMOTE CONTROL<br />
The default mode will be LOCAL CONTROL.<br />
Display Units Selection<br />
Imperial or SI display units may be selected for data<br />
display.<br />
OPTIONS DISPLAY UNITS<br />
◄ ► XXXXXXXXXXXXXXXXXX<br />
The user may select system operating temperatures and<br />
pressures to be displayed in either SI (°C, barg) or Imperial<br />
units (°F, PSIG).<br />
OPTIONS DISPLAY UNITS<br />
◄ ► IMPERIAL<br />
OPTIONS DISPLAY UNITS<br />
◄ ► SI<br />
The default mode is IMPERIAL.<br />
System Lead/Lag Control Mode Selection<br />
The operator may select the type of lead/lag control<br />
desired.<br />
OPTIONS LEAD / LAG CONTROL MODE<br />
◄ ► XXXXXXXXXXXXXXXXXX<br />
In most cases, automatic lead/lag will be selected.<br />
When automatic lead/lag is selected, the microprocessor<br />
will attempt to balance run time by switching the<br />
lead compressor whenever all compressors are shut<br />
OFF. If a compressor is not able to run when the microprocessor<br />
attempts a start, the microprocessor will<br />
select another compressor in an effort to control chilled<br />
liquid temperature. Manual lead/lag allows selecting a<br />
specific compressor to be the lead.<br />
118<br />
FORM 201.28-NM1.1<br />
ISSUE DATE: 8/29/2012<br />
OPTIONS LEAD / LAG CONTROL MODE<br />
◄ ► AUTOMATIC<br />
The default mode will be AUTOMATIC.<br />
Lag selections of individual systems will appear as:<br />
OPTIONS LEAD / LAG CONTROL MODE<br />
◄ ► MANUAL SYS 1 LEAD<br />
OPTIONS LEAD / LAG CONTROL MODE<br />
◄ ► MANUAL SYS 2 LEAD<br />
Remote Temperature Reset Selection<br />
Remote temperature reset from an external source may<br />
be tied directly into the chiller microprocessor board.<br />
OPTIONS REMOTE TEMP RESET INPUT<br />
◄ ► XXXXXXXXXXXXXXXXXX<br />
Selections may be made for DISABLED (no signal),<br />
0 to10VDC, 2 to 10VDC, 0 to 20ma, and 4 to 20ma.<br />
OPTIONS REMOTE TEMP RESET INPUT<br />
◄ ► DISABLED<br />
OPTIONS REMOTE TEMP RESET INPUT<br />
◄ ► 0.0 TO 10.0 VOLTS DC<br />
OPTIONS REMOTE TEMP RESET INPUT<br />
◄ ► 2.0 TO 10.0 VOLTS DC<br />
OPTIONS REMOTE TEMP RESET INPUT<br />
◄ ► 0.0 TO 20.0 MILLIAMPS<br />
OPTIONS REMOTE TEMP RESET INPUT<br />
◄ ► 4.0 TO 20.0 MILLIAMPS<br />
The default setting for Remote Temp Reset is DIS-<br />
ABLED. This display will only appear if the remote<br />
temperature limit option is enabled under the Unit Setup<br />
Mode.<br />
Remote Current Limit Input Selection<br />
Remote current limit from an external source may be<br />
tied directly into the chiller microprocessor board.<br />
OPTIONS REMOTE CURRENT LIMIT INPUT<br />
◄ ► XXXXXXXXXXXXXXXXXXXXX<br />
Selections may be made for DISABLED (no signal),<br />
0 to 10VDC, 2 to 10VDC, 0 to 20ma, and 4 to 20ma.<br />
JOHNSON CONTROLS
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