Table 13 - Program Key Limits And Default - York YLAA Series Installation Operation & Maintenance

SECTION 7 – UNIT CONTROLS
F A N D I F F E R E N T I A L
P R E S S U R E =
The Fan Differential Off Pressure is the programmed
differential pressure value that is used to stage the
condenser fans OFF, in relation to discharge pressure.
See Standard Condenser Fan Control on page 154
in SECTION 8 – UNIT OPERATION and Table 22 on
page 156 and Table 23 on page 157.
T O T A L N U M B E R
C O M P R E S S O R S
The TOTAL NUMBER OF COMPRESSORS is the
total quantity of compressors in the chiller, and deter-
mines the stages of cooling available. Note in Table
13, the chiller may have single or dual systems. Single
system units can have 2 or 3 compressors, while dual
system units may have 4 or 6 compressors.

TABLE 13 - PROGRAM KEY LIMITS AND DEFAULT

PROGRAM VALUE
DISCHARGE PRESSURE CUTOUT
SUCTION PRESSURE CUTOUT
LOW AMBIENT TEMP. CUTOUT
LEAVING CHILLED LIQUID
TEMP. CUTOUT
ANTI-RECYCLE TIMER
FAN CONTROL ON PRESSURE
FAN DIFFERENTIAL OFF PRESSURE
TOTAL NUMBER OF COMPRESSORS
NUMBER OF FANS PER SYSTEM
UNIT/SYSTEM TRIP VOLTS
REMOTE UNIT ID
* 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.
128
O F F
X X X P S I G
O F
= 6
MODE
WATER COOLING
GLYCOL COOLING
STANDARD AMBIENT
LOW AMBIENT
WATER COOLING
GLYCOL COOLING
SINGLE SYSTEM
DUAL SYSTEM
CURRENT FEEDBACK
This MUST be programmed correctly to
assure proper chiller operation.
N U M B E R
P E R S Y S T E M
The Number of Fans Per System must be programmed
as needed to match the number of fans on each system.
S Y S X
U N I T
LOW LIMIT
325 PSIG
—
22.4 BARG
80.0 PSIG
5.52 BARG
42.0 PSIG
2.9 BARG
25.0 °F
-3.9 °C
0 °F
-17.8 °C
—
-1.0 °F
-18.3 °C
— 300 SEC.
360 PSIG
—
24.8 BARG
80 PSID
—
5.51 BARD
2
4
— 2
0.5 Volts
— 0
FORM 150.72-ICOM6
ISSUE DATE: 12/29/2017
O F F A N S
T R I P V O L T S
= X . X V O L T S
T R I P V O L T S
= X . X V O L T S
HIGH LIMIT DEFAULT
575 PSIG 570 PSIG
39.6 BARG 39.3 BARG
120.0 PSIG 80.0 PSIG
8.27 BARG 5.52 BARG
70.0 PSIG 44.0 PSIG
4.83 BARG 3.03 BARG
60.0 °F 25.0 °F
15.6 °C -3.9 °C
60.0 °F 25.0 °F
15.6 °C -3.9 °C
36 °F
—
2.2 °C
36.0 °F 36.0 °F
2.2 °C 2.2 °C
600 SEC. 600 SEC.
485 PSIG 385 PSIG
33.4 BARG 26.5 BARG
160 PSID* 125 PSID
11.03 BARD* 8.62 BARD
3
6
4
4.5 Volts 2.5 Volts
7
JOHNSON CONTROLS
= X
3
6
3
0