JOHNSON CONTROLS
239
SECTION 8 - MICROPANEL
FORM 201.23-NM2
ISSUE DATE: 09/25/2020
8
TABLE 18 - START INHIBIT SENSOR THRESHOLDS
SENSOR
LOW THRESH-
OLD
HIGH THRESH-
OLD
Suction
Transducer
0.3 VDC 4.7 VDC
Oil Transducer 0.3 VDC 4.7 VDC
Discharge
Transducer
0.3 VDC 4.7 VDC
Level Sensor 3.0 mA 21.0 mA
Motor Temp.
Sensor
0ºF 240ºF
High Motor Temperature Cutout Fault
The High Motor Temperature Cutout prevents a com-
pressor from running when its motor temperature is too
high. A system will fault and shut down when any com-
pressor motor temperature sensor rises above 250°F.
The system will be inhibited from starting if its mo-
tor temperatures sensors indicate temperatures above
240°F. If any single temperature sensor is being ig-
nored under the Unit Set-up Mode, that sensor will not
be utilized when evaluating motor temperature.
Below is a sample Status display fault message:
SYS X YYYYYYYY HIGH MOTOR TEMP
X indicates the system and YYYYYYY indicates the
system is in a “FAULT” condition and will restart when
the fault clears or “LOCKOUT” and will not restart un-
til the operator clears the fault using the keypad.
High Flash Tank Level Cutout Fault
The Flash tank level Cutout prevents the system from
running when the liquid level in the flash tank is too
high. The safety will be ignored for the first 15 seconds
of system operation.
A fault will occur if the tank level is greater than 85%
for 10 seconds.
Below is a sample Status fault display fault message:
SYS X YYYYYYYY HIGH FLASH TANK LEVEL
X indicates the system and YYYYYYY indicates the
system is in a “FAULT” condition and will restart when
the 120 second anti-recycle timer times out or “LOCK-
OUT” and will not restart until the operator clears the
fault using the keypad.
System Control Voltage Cutout Fault
The System Control Voltage Cutout alerts the operator
the 115 VAC Control voltage to one of the systems is
missing. This could be due to a system fuse that has
been removed or is blown. The affected system will
fault and shut down immediately when the 115 VAC
supply is lost.
The safety will “not” shut down a system if the UNIT
switch is OFF, which electrically removes the 115 VAC
to “all” systems. The safety is only used to indicate
a situation where a single system is missing the 115
VAC. The safety will not cause a lockout and the sys-
tem fault will reset when power is returned. A sample
message is shown below:
SYS X YYYYYYYY CONTROL VOLTAGE
X indicates the system and YYYYYYY indicates the
system is in a “FAULT” condition and will restart when
the fault clears or “LOCKOUT” and will not restart un-
til the operator clears the fault using the keypad.
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