JOHNSON CONTROLS
248
FORM 201.23-NM2
ISSUE DATE: 3/9/2015
SECTION 8 - MICROPANEL
ZZZZZZZZZZZ indicates the failed sensor below:
• SUCT PRESS
• OIL PRESS
• DSCH PRESS
• LEVEL SENSOR
• MOTOR TEMP X *
* The Unit Setup Mode allows a specic motor temperature sensor
to be ignored, if it fails.
The start inhibit thresholds for each sensor are shown
in Table 14 on page 248.
TABLE 14 - START INHIBIT SENSOR THRESHOLDS
SENSOR
LOW THRESH-
OLD
HIGH THRESH-
OLD
Suction
Transducer
0.3VDC 4.7VDC
Oil Transducer 0.3VDC 4.7VDC
Discharge
Transducer
0.3VDC 4.7VDC
Level Sensor 3.0ma 21.0ma
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 115VAC 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 115VAC
supply is lost.
The safety will “not” shut down a system if the UNIT
switch is OFF, which electrically removes the 115VAC
to “all” systems. The safety is only used to indicate a
situation where a single system is missing the 115VAC.
The safety will not cause a lockout and the system 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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