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6.30. Compressor Internal Thermal Protection
If the compressor's internal thermal protector trips,
the contactor fails, or the contactor is miswired, the
controller will detect the loss of current and display an
E28 warning code. This happens if both of the current
transducers do not sense current for 1 second when
the controller sends a compressor run signal. To avoid
any fault triggering during the compressor startup period
caused by the high inrush current, current sensing is
not processed by the controller until 6 seconds after
compressor startup.
6.31. Fixed High Pressure Control
The high pressure control is a nonadjustable pressure
switch that opens at 440 +/- 10 psig and resets at
348psig in the event of high discharge pressure. If the
high pressure switch is open, the compressor shuts off
immediately, ignoring any overrides. As long as the high
pressure switch is open, the compressor will not run.
The compressor will stay off for 3 minutes regardless of
when the pressure switch resets. E40 will be displayed
while the unit is shut down.
If the compressor trips more than 5 times per hour,
the controller will lock out the compressor, requiring a
manual reset or the unit power to be reset. Error code
L40 means the compressor tripped on high pressure
and is locked out. If the parameter HPn is set to 0, the
unit will always automatically reset.
6.32. Alarm Contact
The alarm contact (A1 and A2 on terminal block) is a dry
contact that can be wired to an external warning device
such as a buzzer or light. This relay has a 5 Amp limit,
up to 250V. The alarm contact will close in the event of
an alarm or lockout.
© 2016 Emerson Climate Technologies, Inc.
6.33. Anti-Flood Back Warning
System Liquid Flood Back Warning Logic:
High-side superheat is the discharge line temperature
minus the mid-coil temperature. If high-side superheat
is less than 18°F for longer than 30 minutes during
the last 45 minutes, the controller will display E50,
but continue running the system. When the high-side
superheat climbs above 18°F for 30 minutes, then the
warning signal stops.
6.34. High Condensing Temperature Warning
An E46 warning means the condensing temperature
exceeded 150°F. The fans will run at full speed but the
compressor does not shut down. The warning clears
when the temperature drops below 140°F.
7. Local and Remote Displays and
Communication
The controller can communicate with Modbus RTU
RS485 supervisory controllers. An optional remote
display is available. The display can be mounted up
to 30 feet from the unit. To connect and configure the
remote display, follow the instructions included with
the remote display
16
AE5-1412 R1
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