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