York YCUL0045E, Установка, эксплуатация и обслуживание

Страница: 78 / 144

JOHNSON CONTROLS
78
FORM 150.63-NM8 (1020)
UNIT CONTROLS
460VAC SYSTEM TRIP VOLTS
For individual system high current trip programming
on 460VAC chillers:
• Add the sum of the compressor and fan RLA’s in
the system
• Multiply the sum by 1.25
• Divide by 225A
• 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
= 2.8V
225A 225A
The programmed value will be 2.8V. A similar calcula -
tion and programming will be necessary for the other
system in a 2-system chiller.
460VAC UNIT TRIP VOLTS
For total chiller high current trip programming on
460VAC chillers:
• Add the sum of all the compressor and fan RLA’s
in the chiller
TABLE 16 – 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 225A
• 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
= 5.0V
225A 225A
The programmed value will be 5.0V.
208/230VAC CHILLERS
On 208/230VAC chillers, the process is similar, but
instead of performing the calculation using 225A, a
number of 450A must be substituted.
When communications is required with a BAS or
OptiView Panel, individual unit IDs are necessary for
communications 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