York MILLENNIUM, Operating Instructions Manual

Page: 10 / 16

10
YORK INTERNATIONAL
PROGRAMMABLE VALUES
Cooling Setpoints
Cooling setpoints and ranges can be programmed by
pressing the COOLING SETPOINTS key. For chill-
ers, the cooling mode will be displayed for a few sec-
onds and then the setpoint entry screen will be dis-
played. Depending on whether the unit is a chiller or
condensing unit will determine the cooling modes dis-
played (leaving or return chilled liquid, discharge air
temperature, or suction pressure control). Refer to the
chiller or condensing unit Installation, Operation, and
Maintenance manual for a detailed explanation of these
functions.
The table below contains the allowable ranges for the
cooling setpoints and control ranges. Note that the En-
glish units are exact values while the Metric units are
approximate.
If the chiller is programmed for REMOTE control, the
following setpoints can be changed by pressing the
COOLING SETPOINTS key. The values can be
changed by using the Up Arrow and Down Arrow keys
and then entering the new setpoint by pressing the EN-
TER key. If the chiller control panel is programmed for
LOCAL control, the setpoints cannot be changed from
the RCC and an attempt to do so will result in the fol-
lowing message:
F U N C T I O N N O T A L L O W E D
U N D E R C O N D I T I O N S
Following are the messages for the programming of the
setpoint and range for leaving and return chilled liquid
control respectively. These are for chillers only.
Following are the messages for the programming of the
setpoint and range for discharge air temp and suction
pressure control respectively. These are for condens-
ing units only.
S E T P O I N T = X X X . X ° F
R A N G E = + / – X . X ° F
S E T P O I N T = X X X . X ° F
R A N G E = + X X . X ° F
S E T P O I N T = X X X . X ° F
R A N G E = + / – X . X ° F
S Y S 1 S P = X X X X P S I G
R A N G E = + / - X X X P S I G
S Y S 2 S P = X X X X P S I G
R A N G E = + / - X X X P S I G
TABLE 1 – ALLOWABLE RANGES FOR COOLING SETPOINTS AND CONTROL RANGES
SETPOINT KEY MODE LOW LIMIT HIGH LIMIT DEFAULT
LEAVING CHILLED LIQUID SETPOINT
WATER COOLING
40.0°F **70.0°F 40.0°F
4.4°C 21.1°C 6.7°C
GLYCOL COOLING
10.0°F 70.0°F 44.0°F
-12.2°C 21.1°C 6.7°C
LEAVING CHILLED LIQUID
—
1.5°F 2.5°F 2.0°F
CONTROL RANGE 0.8°C 1.4°C 1.1°C
RETURN CHILLED LIQUID SETPOINT
WATER COOLING
40.0°F 70.0°F 44.0°F
4.4°C 21.1°C 6.7°C
GLYCOL COOLING
10.0°F 70.0°F 44.0°F
-12.2°C 21.1°C 6.7°C
RETURN CHILLED LIQUID
—
4.0°F 20.0°F 10.0°F
CONTROL RANGE 2.2°C 11.1°C 5.6°C
DISCHARGE AIR TEMP SETPOINT —
45.0°F 70.0°F 55.0°F
7.2°C 21.1°C 12.7°C
DISCHARGE AIR TEMP CONTROL RANGE —
3.0°F 10.0°F 5.0°F
1.7°C 5.6°C 2.8°C
SUCTION PRESSURE SETPOINTS
—
60 PSIG 90 PSIG 70 PSIG
4.14 BARS 6.21 BARS 4.83 BARS
SUCTION PRESSURE CONTROL RANGES —
1.5 PSIG 10 BARS 2.5 BARS
0.10 BARS 0.69 BARS 0.17 BARS
Programmable Values