YORK INTERNATIONAL
FORM 150.63-NM1
115
3
Another anti-recycle timer is started each time the sys-
tems number one compressor cycles off. This anti-re-
cycle time is fixed at 120 seconds and starts to count-
down when the systems number one compressor cycles
off.
The anti-recycle message is displayed when the system
is unable to start due to either of the anti-recycle timers
being active (counting down). The actual time displayed
will be the longer of the two timers, start-to-start or
stop-to-start.
The Fan Control On Pressure is the programmed pres-
sure value that is used to stage the condenser fans on,
in relation to discharge pressure. Refer to Condenser
Fan Control in the UNIT OPERATION section and
Tables 21, 22, and 23, 24. The Fan Control On Pres-
sure is designated as ctrl_press in the tables.
The Fan Differential Off Pressure is the programmed
differential pressure value that is used to stage the con-
denser fans off, in relation to discharge pressure. Refer
to Condenser Fan Control in the UNIT OPERATION
section and Tables 21, 22, and 23, 24. The Fan Differ-
ential Off Pressure is designated as diff_press in the
tables.
The TOTAL NUMBER OF COMPRESSORS are the
amount of compressors in the chiller, and determines
the stages of cooling available. Notice in Table 14 that
the selection available will vary depending on whether
the chiller is a single or dual refrigerant circuit.
This must be programmed correctly to
assure proper chiller operation.
TABLE 14 – PROGRAM KEY LIMITS AND DEFAULTS
PROGRAM VALUE
MODE
LOW LIMIT
HIGH LIMIT
DEFAULT
Discharge Pressure Cutout
—
200 PSIG
399 PSIG
395 PSIG
—
13.8 Bars
27.5 Bars
27.2 Bars
Suction Pressure Cutout
—
44.0 PSIG
70.0 PSIG
44.0 PSIG
—
3.03 Bars
4.83 Bars
3.03 Bars
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
230 PSIG
—
15.5 Bars
20.7 Bars
15.9 Bars
Fan Differential Off-Pressure
—
50 PSIG
150 PSIG
80 PSIG
—
3.45 Bars
10.32 Bars
5.52 Bars
Total Number of Compressors
Single System
2
3
3
Two Systems
4
6
6
F A N
C O N T R O L
O N
P R E S S U R E = X X X P S I G
T O T A L
N U M B E R
O F
C O M P R E S S O R S
=
6
F A N
D I F F E R E N C I A L
O F F
P R E S S U R E = X X X P S I G
Summary of Contents for MILLENNIUM YCUL0016SC
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