YORK INTERNATIONAL
23
FORM 160.60-O1
To Display
CHILLER DATA
press the
CHILLER DATA
key as described in page 19 to produce the following
alphanumeric display messages:
SAT. TEMP EVAP = XXX.X °F, COND = XXX.X °F
DISCHARGE TEMP = XXX.X °F, OIL = XXX.X °F
HOP = XXXX.X PSIG; LOP = XXXX.X PSIG
PROXIMITY SENS-POS: XX MILS, REF:XX MILS
HIGH SPEED DRAIN TEMP = XXX.X °F
DELTA P OVER P = X.XX; PRV = XXX %
ENGINE RPM = XXXX, RPMS = XXXX
MACH = X.XX; MACHS = X.XX
To Display
OPERATING HOURS
and
STARTS
COUNTER
:
Use the
OPERATING HOURS
key as described on page
19 to produce the following message:
OPER. HOURS = XXXXX; START COUNTER = XXXXX
NOTE: The operating hours and starts counter can
be reset to zero. Refer to Programming the
Micro - Computer Control Center, page 27.
However, the purpose of the
OPERATING
HOURS
key is to display the total accumu-
lated chiller run time. Therefore, the operat-
ing hours should not be arbitrarily reset.
SYSTEM SETPOINTS
The system setpoints may be programmed by the sys-
tem operator. The
SETPOINTS
keys are located on the
Control Center keypad (See Fig. 4). To program, see Pro-
gramming System Setpoints, page 27. The following is
a description of these setpoints (with the English/Metric
jumper installed on the Micro Board):
CHILLED LIQUID TEMP
This key displays the leaving
chilled water temperature (LCWT) setpoint in degrees
Fahrenheit. If not programmed, the default value is 45°F.
See Programming System Setpoints, page 27.
NOTE: If an Energy Management System is interfaced
to the Control Center for the purpose of re-
mote LCWT setpoint reset, then the operator-
programmed chilled liquid temp will be the base
or lowest setpoint available to the Energy Man-
agement System (EMS). This chilled liquid
temp value must also be entered into the EMS.
Further, any subsequent change to this value
must also be entered into the EMS.
% ENGINE LOAD LIMIT
This key displays the maxi-
mum value of engine loading permitted by its programmed
setting. The value is in terms of percent of engine load-
ing. If not programmed, the default value is 100%. (See
Programming System Setpoints, page 27).
PULL DOWN DEMAND
This function is used to pro-
vide energy savings following the chiller start-up. This key
displays a programmable engine load limit and a pro-
grammable period of time. Operation is as follows: When-
ever the system starts, the Pull Down Demand Limit is
maintained for the programmed time, then the engine load
limit control returns to % engine load limit setpoint. The
maximum permitted Engine Loading is in terms of %.
The duration of time that the Engine Loading is limited is
in terms of minutes (to a maximum of 255). If not pro-
grammed, the default value is 100% for 00 minutes (See
Programming Systems Setpoints, page 27). Thus, no
pull down demand limit is imposed following system start,
and the % Engine Load Limit setpoint is used.
CLOCK
This key displays the day of the week, time of day
and calendar date. If not programmed, the default value is
SUNDAY 12:00 AM 1/1/95
(See Programming System Setpoints, page 27).
1400
1500
1600
1700
1800
30.00
25.00
20.00
15.00
5.00
0.00
10.00
Speed (RPM)
Manif
old Pressure (PSIA)
G3408 Lean Burn Loading Chart
0% Load
25% Load
50% Load
75% Load
100% Load
125% Load
0%
25%
50%
75% 100%
125%
1400
0.0
9.1
14.8
18.9
23.6
27.6
1500
0.0
9.5
15.2
19.2
23.9
27.6
1600
0.0
10.0
15.8
20.0
24.4
27.6
1700
0.0
10.4
16.2
20.6
24.8
27.6
1800
0.0
10.8
16.2
20.5
24.9
28.4
LD02529
FIG. 6
MANIFOLD PRESSURE VS. ENGINE SPEED (Contd)
S
E
C
T
2
