Johnson Controls YORK Tempo YLAA Series, Installation Operation & Maintenance

Page: 147 / 192

FORM 150.72-NM1 (1020)
147
JOHNSON CONTROLS
7
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.
• Multiply the sum by 1.25
• Divide by 225A
• The resulting voltage is the value that should be
programmed.
For example, if fan and compressor RLA’s total 180A:
The programmed value will be 5.0V.
5V x 180A x 1.25 = 1125VA = 5.0V
225A 225A
* The minimum discharge pressure allowed is 235 PSIG. The Fan Differential Off Pressure High Limit will be lowered (reduced) to
prevent going below 235 PSIG based on where the fan control On Pressure is programmed.
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
TABLE 11 – PROGRAM KEY LIMITS AND DEFAULT
PROGRAM VALUE MODE LOW LIMIT HIGH LIMIT DEFAULT
DISCHARGE PRESSURE CUTOUT —
325 PSIG 575 PSIG 570 PSIG
22.4 BARG 39.6 BARG 39.3 BARG
SUCTION PRESSURE CUTOUT
WATER COOLING
80.0 PSIG 120.0 PSIG 80.0 PSIG
5.52 BARG 8.27 BARG 5.52 BARG
GLYCOL COOLING
42.0 PSIG 70.0 PSIG 44.0 PSIG
2.9 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
LEAVING CHILLED LIQUID TEMP
CUTOUT
WATER COOLING — —
36.0°F
2.2°C
GLYCOL COOLING
1.0°F 36.0°F 36.0°F
-18.3°C 2.2°C 2.2°C
ANTI-RECYCLE TIMER — 300 SEC. 600 SEC. 600 SEC.
FAN CONTROL ON PRESSURE
—
360 PSIG 485 PSIG 385 PSIG
24.8 BARG 33.4 BARG 26.5 BARG
FAN DIFFERENTIAL OFF PRESSURE —
80 PSIG 160 PSID* 125 PSID
5.51 BARG 11.03 BARG* 8.62 BARG
TOTAL NUMBER OF COMPRESSOR
SINGLE SYSTEM 2 3 3
DUAL SYSTEM 4 6 6
NUMBER OF FANS PER SYSTEM 2 4 3
UNIT/SYSTEM TRIP VOLTS
CURRENT
FEEDBACK
0.5 4.5 2.5
REMOTE UNIT ID — 0 7 0