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TABLE 13 – COOLING SETPOINTS PROGRAMMABLE LIMITS AND DEFAULTS
SETPOINT VALUE
LOW LIMIT
HIGH LIMIT
DEFAULT
Discharge Air Temp. Setpoint
45.0 °F
70.0°F
44.0°F
7.2°C
21.1°C
12.7°C
Discharge Air Temp. 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 Range
2 PSIG
10 PSIG
3 PSIG
.13 BARS
.69 BARS
.20 BARS
Max EMS - PWM Remote Temp. Reset
2°F
40°F
20°F
1°C
22°C
11°C
Unit Controls
PROGRAM KEY
There are six operating parameters under the PRO-
GRAM key that are programmable. These setpoints can
be changed by pressing the PROGRAM key, and then
the ENTER/ADV key to enter Program Mode. Con-
tinuing to press the ENTER/ADV key will display each
operating parameter. While a particular parameter is be-
ing displayed, the UP and DOWN arrow keys can be
used to change the value. After the value is changed,
the ENTER/ADV key must be pressed to enter the data
into memory. Table 14 shows the programmable limits
and default values for each operating parameter.
Following are the displays for the programmable val-
ues in the order they appear:
DISCHARGE PRESSURE CUTOUT is the discharge
pressure at which the system will shutdown as moni-
tored by the optional discharge transducer. This is a
software shutdown that acts as a backup for the me-
chanical high pressure switch located in the refrigerant
circuit. The system can restart when the discharge pres-
sure drops 40 PSIG (2.76 BARG) below the cutout point.
If the optional discharge pressure transducer is not in-
stalled, this programmable safety would not apply. It
should be noted that every system has a mechanical high
pressure cutout that protects against excessive high dis-
charge pressure regardless of whether or not the op-
tional discharge pressure is installed.
The SUCTION PRESSURE CUTOUT protects the
chiller from an evaporator freeze-up. If the suction pres-
sure drops below the cutout point, the system will shut
down.
There are some exceptions when the
suction pressure is permitted to tem-
porarily drop below the cutout point.
Details are explained under the topic
of System Safeties.
The LOW AMBIENT TEMP CUTOUT allows the user
to select the chiller outside ambient temperature cutout
point. If the ambient falls below this point, the chiller
will shut down. Restart can occur when temperature rises
2°F (1.11°C) above the cutout setpoint in Table 14.
The anti-recycle timer message shows the amount of time
left on the respective systems anti-recycle timer. The
programmed ANTI RECYCLE TIME will start to count
down at the start of the systems number one compressor.
In effect, this is the minimum time start-to-start on the
respective systems number one compressor.
D I S C H A R G E
P R E S S U R E
C U T O U T
=
3 9 5
P S I G
S U C T I O N
P R E S S U R E
C U T O U T
=
4 4 . 0
P S I G
L O W
A M B I E N T
T E M P
C U T O U T
=
2 5 . 0 ° F
A N T I
R E C Y C L E
T I M E
=
6 0 0
S E C
Summary of Contents for MILLENNIUM YCUL0016SC
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