JOHNSON CONTROLS
132
FORM 150.67-NM2 (209)
Unit Controls
During the 30 minute timeout, the MP/HPCO INHIB
message will be displayed. The MP/HPCO fault will
only be displayed after 3 shutdowns in 90 minutes,
indicating the system is locked out and will not
restart.
When the System Current Feedback option is installed
and selected (Option 11 under OPTIONS Key Current
Feedback), this safety will operate as follows. If the
actual feedback voltage of the system proportional to
currents exceeds the programmed trip voltage for 5
seconds, the system will shutdown.
This safety will shut down a system if either suction
temperature or suction pressure sensors read out of
range high or low. This condition must be present for 3
seconds to cause a system shutdown. The safety locks
out a system after the
fi
rst fault and will not allow
automatic restarting.
The internal motor protector opens at 185 °F – 248 °F
(85 °C – 120 °C) and auto resets. The mechanical HP
switch opens at 585 PSIG +/- 10 PSIG (27.92 barg +/- .69
barg) and closes at 330 PSIG +/- 25 PSIG (22.75 barg
+/- 1.72 barg).
The compressor is also equipped with a discharge
temperature sensor for the purpose of sensing internal
scroll temperature. This sensor protects the scrolls
from overheating due to inadequate cooling that may
occur when refrigerant charge is low, or superheat is
too high.
When the sensor senses a high temperature, it opens the
motor protector circuit in the compressor causing the
compressor to shut down.
During the
fi
rst two faults an MP/HP INHIBIT message
will be displayed and the system will not be locked
out. Only after the third fault in 90 minutes will the
MP/HPCO FAULT message be displayed.
Whenever the motor protector or discharge sensor
shuts down a compressor and the system, the internal
compressor contacts will open for a period of 30 minutes
to assure that the motor or scroll temperatures have
time to dissipate the heat and cool down. The MP/HP
INHIBIT message
will be displayed while these
contacts are open or when the HPCO is open. While
this message is displayed, the compressors will not
be permitted to start.
After 30 minutes, the contacts will close and the system
will be permitted to restart. The micro will not try to
restart the compressors in a system that shuts down on
this safety for a period of 30 minutes to allow the internal
compressor to time out.
S Y S 1
H I G H M T R C U R R
S Y S 2
H I G H M T R C U R R
Summary of Contents for YCAL0019
Page 55: ...FORM 150 67 NM2 209 55 JOHNSON CONTROLS 5 5 ELEMENTARY WIRING DIAGRAM CON T LD12699D...
Page 57: ...FORM 150 67 NM2 209 57 JOHNSON CONTROLS 5 5 ELEMENTARY WIRING DIAGRAM CON T LD12693C...
Page 59: ...FORM 150 67 NM2 209 59 JOHNSON CONTROLS 5 5 ELEMENTARY WIRING DIAGRAM CON T LD 12198...
Page 61: ...FORM 150 67 NM2 209 61 JOHNSON CONTROLS 5 5 LD12702 ELEMENTARY WIRING DIAGRAM CON T...
Page 63: ...FORM 150 67 NM2 209 63 JOHNSON CONTROLS 5 5 LD12696 ELEMENTARY WIRING DIAGRAM CON T...
Page 65: ...FORM 150 67 NM2 209 65 JOHNSON CONTROLS 5 5 CONNECTION WIRING DIAGRAM CON T LD12703B...
Page 67: ...FORM 150 67 NM2 209 67 JOHNSON CONTROLS 5 5 CONNECTION WIRING DIAGRAM CON T LD12697B...
