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JOHNSON CONTROLS
102
FORM 150.63-NM6 (1020)
Unit Controls
SYSTEM TRIP VOLTS
For individual system high current trip programming
on chillers:
• Add the sum of the compressor and fan RLA’s in
the system
• Multiply the sum by 1.25
• Divide by 270A
• The resulting voltage is the value that should be pro-
grammed
For example, if fan and compressor RLA’s total 100A:
5V x 100A
x 1.25 =
625VA
= 2.3V
270A 270A
The programmed value will be 2.3V. A similar calcu
-
lation and programming will be necessary for the other
system in a 2-system chiller.
UNIT TRIP VOLTS
For total chiller high current trip programming on
chillers:
• Add the sum of all the the compressor and fan RLA’s
in the chiller
TABLE 19 –
PROGRAM KEY LIMITS AND DEFAULTS
*
The minimum discharge pressure allowed is 160 PSIG. The fan differential Off Pressure will be lowered to prevent going below 160
PSIG based on where the fan control On Pressure is programmed.
PROGRAM VALUE
MODE
LOW LIMIT
HIGH LIMIT
DEFAULT
DISCHARGE PRESSURE CUTOUT
--
200 PSIG
399 PSIG
395 PSIG
13.8 BARG
27.5 BARG
27.2 BARG
SUCTION PRESSURE CUTOUT
WATER COOLING
44.0 PSIG
70.0 PSIG
44.0 PSIG
3.03 BARG
4.83 BARG
3.03 BARG
LOW AMBIENT TEMP. CUTOUT
STANDARD AMBIENT
25.0°F
60.0°F
25.0°F
-3.9°C
15.6°C
-3.9°C
LOW AMBIENT
0°F
60.0°F
25.0°F
-17.8°C
15.6°C
-3.9°C
ANTI-RECYCLE TIMER
--
300 SEC.
600 SEC.
600 SEC.
FAN CONTROL ON PRESSURE
--
225 PSIG
300 PSIG
240 PSIG
15.5 BARG
20.7 BARG
16.5 BARG
FAN DIFFERENTIAL OFF PRESSURE
--
50 PSIG
100 PSID*
80 PSID
3.45 BARG
6.89 BARG*
5.52 BARG
TOTAL NUMBER OF COMPRESSORS
SINGLE SYSTEM
2
3
3
TWO SYSTEMS
4
6
6
UNIT/SYSTEM TRIP VOLTS
CURRENT FEEDBACK
OPTION ENABLED
ONE PER UNIT
0.5
4.5
2
REMOTE UNIT ID
--
0
7
0
• Multiply the sum by 1.25
• Divide by 270A
• The resulting voltage is the value that should be pro-
grammed
For example, if fan and compressor RLA’s total 180A:
5V x 180A
x 1.25 =
1125VA
= 4.0V
270A 270A
The programmed value will be 5.0V.
When communications is required with a BAS or Op-
tiView Panel, individual unit IDs are necessary for com
-
munications with specific chillers on a single RS-485
line. ID 0-7 is selectable.
R E M O T E U N I T I D
P R O G R A M M E D = X
Summary of Contents for YCUL0045
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