YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls

SECTION 8 - MICROPANEL
Eductor Differential
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
EDUCTOR DIFFERENTIAL = XXX °F
The eductor temperature differential is programmable
from 0°C to 10.0°C (0°F to 50.0°F). The default value
is 5.0°F. The programmed temperature assures the micro
will sense a loss of educator oil flow, if the temperature
differential rises. A small differential of 2.8°C
(5.0°F) is recommended.
Eductor Safety Time
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
EDUCTOR SAFETY TIME = XXXX MIN
The educator safety time allows programming the
time period the system is permitted to run if the safety
threshold is exceeded. The safety time is programmable
for 10 minutes to 1000 minutes with 10 minutes as
the default. A minimum safety time is recommended
to assure the compressor is not starved for oil for long
periods of time due to the educator circuit not siphon-
TABLE 11 - PROGRAMMABLE OPERATING PARAMETERS
116
FORM 201.28-NM1.1
ISSUE DATE: 8/29/2012
ing oil from the evaporator. A minimum time of 10
minutes is recommended as the program point.
Motor Temperature Unload
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
MOTOR TEMPERATURE UNLOAD = XXX °F
The motor temperature unload is programmable from
65.6°C (150.0°F) to 121.1°C 250.0°F. The default value
is 115.5°C (240.0°F). The programmed temperature
assures the micro will sense a rise in motor temperature
due to a lack of compressor cooling. If the temperature
rises above the programmed threshold, the system will
unload the compressor by reducing speed. An unload
temperature of 115.5°C (240.0°F) is recommended to
assure the system does provides maximum capacity.
Default Values
A listing of the low limits, high limits, and default values
for each of the programmable values is noted in
each display and can be found in Table 11. Note that
the Imperial units are exact values while the Metric
units are only approximate.
PROGRAM VALUE MODE LOW LIMIT HIGH LIMIT DEFAULT
Water
24.0 PSIG 36.0 PSIG 24.0 PSIG
Suction Pressure Cutout
Cooling
Glycol
1.65 barg
5.0 PSIG
2.48 barg
36.0 PSIG
1.65 barg
24.0 PSIG
Cooling
0.34 barg 2.48 barg 1.65 barg
Low Ambient Temp. Cutout -
-2.0°F
-18.9°C
50.0°F
10.0°C
25.0°F
-3.9°C
Water
- - 36.0°F
Leaving Chilled Liquid Temp. Cutout
Cooling
Glycol
-
11.0°F
-
36.0°F
2.2°C
36.0°F
Cooling
-11.7°C 2.2°C 2.2°C
Motor Current Limit - 30% FLA 103% FLA 103% FLA
Pulldown Motor Current Limit - 30% FLA 100% FLA 100% FLA
Pulldown Motor Current Limit Time - 0 Min 255 Min 0 Min
Condenser Subcooling Setpoint -
0.0°F
0.0°C
20.0°F
11.1°C
5.0°F
2.8°C
Unit ID Number - 0 7 0
Sound Limit Setpoint
Sound Limit
Option Enabled
0% 100% 0%
Eductor Temp Differential -
5.0°F
2.77°C
50.0°F
27.8°C
15.0°F
8.3°C
Eductor Safety Time - 10 Min 1000 Min 30 Min*
Motor Temperature Unload -
150.0°F
65.6°C
250.0°F
121.1°C
240.0°F
115.5°C
JOHNSON CONTROLS