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Condensing Unit Operational Control
The X-Line control module operates the condensing unit
and ensures the system remains in correct operating
conditions. It controls the follow items:
• Compressor
• Condenser Fan Motor(s)
• Crank Case Heater
• Receiver Heater
• Defrost Heater (If connected)
The X-line Unit will protect the system from the following
fault conditions (See Sections 6.23 through 6.31 for
further details):
• Discharge Line Temperature Protection
• Over-Current Protection
• Incorrect Phase Sequence Protection (3 Phase
Only)
• Loss of Phase Protection - Current (3 Phase Only)
• Open Run Circuit (Single Phase Only)
• Open Start Circuit (Single Phase Only)
• Over/ Under Voltage Protection
• Phase Imbalance (3 Phase Only)
• Compressor Internal Thermal Protection
• Fixed High Pressure Control
In addition, the X-Line unit has protection features
that will prevent it from reaching a fault condition. For
example, when the low temperature unit experiences
an extremely hot day, the control module decides to
switch from vapor-injection-optimization to discharge
gas temperature control to allow the compressor to run
safely and pass the extreme weather hours.
6.14. Controller Startup
At initial power up, the controller display will display the
following information:
All LEDs will light up for approximately 2 seconds.
For 3 seconds, the controller will display the
firmware version (EX: 1.0, 1.1, etc.)
For three seconds the controller will display the
program number (EX: 100, 101, 200, etc.)
The controller will then wait 6 seconds before turning
on the compressor or any other device.
© 2016 Emerson Climate Technologies, Inc.
Once the controller calls for the compressor to run and
there are no active alarms, the controller will then turn
on the compressor utilizing bump start (if needed per
Section 6.15) and control the fans and compressor.
6.15. Bump Start Control Operation
If the ambient temperature sensor reads less than
95°F when the controller is first turned on or after the
compressor has been off for 4 hours and now is being
turned on, the compressor will initiate a bump start. If
the ambient temperature sensor is not functioning, the
mid-coil temperature sensor will determine if the unit
will initiate a bump start or not.
The compressor and fans will run for 2 seconds then
turn off for 15 seconds three times. Once this sequence
is completed, the unit resumes normal operation.
The crank case heater will remain off during the bump
start sequence.
If liquid injection, vapor injection, or a system EXV is
present, the stepper valve will remain closed until the
bump start has finished.
In the event of a power loss, the controller can be
programmed to enter a defrost at power up if dPo is
set to YES. It is turned off by default, but is adjustable
from the advanced options menu.
6.16. Compressor Stop Program
When the compressor needs to turn off, either based
on an error or loss of demand, the following items will
occur:
• Liquid or Vapor Injection Only: If a non-error
shutdown occurs, compressor runs for 5 seconds
before turning off to allow the liquid of vapor
injection valves to fully close.
• Compressor turns off
• Condenser fans turn off
Crankcase heater turned on (See Section 6.17)
NOTE: During the pump down process with the 5
second delay the compressor may run down into
a vacuum. There are no reliability issues in this
application.
11
AE5-1412 R1
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