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 â—„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 â—„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 Table 25 on page
149. 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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