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SECTION 8 - MICROPANEL
JOHNSON CONTROLS
149
FORM 201.28-NM1.1
ISSUE DATE: 1/31/2018
8
The programmed temperature assures the micro will
sense a loss of educator oil flow, if the temperature dif-
ferential 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 program-
mable for 10 minutes to 1000 minutes with 10 min-
utes as the default. A minimum safety time is recom-
mended to assure the compressor is not starved for oil
for long periods of time due to the educator circuit not
siphoning 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 val-
ue 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
. Note that the Imperial units are exact values
while the Metric units are only approximate.
TABLE 25 -
PROGRAMMABLE OPERATING PARAMETERS
PROGRAM VALUE
MODE
LOW LIMIT
HIGH LIMIT
DEFAULT
Suction Pressure Cutout
Water
Cooling (R-134a)
24.0 PSIG
36.0 PSIG
24.0 PSIG
1.65 barg
2.48 barg
1.65 barg
Glycol
Cooling (R-134a)
5.0 PSIG
36.0 PSIG
24.0 PSIG
0.34 barg
2.48 barg
1.65 barg
Suction Pressure Cutout
Water
Cooling (R-513A)
28.0 PSIG
40.7 PSIG
28.0 PSIG
1.93barg
2.80 barg
1.93 barg
Glycol
Cooling (R-513A)
7.7 PSIG
40.7 PSIG
28.0 PSIG
0.53 barg
2.80 barg
1.93 barg
Leaving Chilled Liquid Temp. Cutout
Water
Cooling
-
-
36.0°F
-
-
2.2°C
Glycol
Cooling
11.0°F
36.0°F
36.0°F
-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
20.0°F
5.0°F
0.0°C
11.1°C
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
50.0°F
15.0°F
2.77°C
27.8°C
8.3°C
Eductor Safety Time
-
10 Min
1000 Min
30 Min*
Motor Temperature Unload
-
150.0°F
250.0°F
240.0°F
65.6°C
121.1°C
115.5°C
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