•
Mode #3
In this mode, the primary slide continues to track the value of the optimum Vi and the secondary slide is
placed in load to force the compressor to maximum capacity. This ensures the maximum capacity from
the compressor while maintaining the optimum Vi setting for the current operating conditions. The
capacity slide of the compressor will always be displayed as 100% while operating in
Mode #3
. While the
compressor is in this mode, any unload signal will cause the Vi
Mode #3
to transition back to
Mode #2
.
3.13
Lubrication System
3.13.1
Full Time
For this type of lubrication system, when the compressor is instructed to start, the oil pump will start and run for
the period of time defined by the
Prelube Timer
if applicable. During this prelube period, the oil pump must
develop adequate oil pressure so that the oil differential pressure falls within the range defined by the
Low Oil
Differential Pressure Shutdown
and the
High Oil Differential Shutdown
parameters. In addition, if the capacity
slide position is above the
Maximum Capacity Slide Allow to Start
parameter, the panel will attempt to unload the
compressor to a capacity slide position below this parameter. Both of these conditions must be satisfied prior to
the panel issuing a compressor start command. The oil pump will stop if the compressor fails to start, but will
otherwise run continuously for as long as the compressor is in the running state. Once the compressor is stop-
ped, either normally or due to a shutdown condition, the oil pump will continue to run until the capacity slide has
returned to its minimum position. If the compressor was stopped normally, the oil pump will continue to run for a
period of time defined by the
Oil Pump Postlube Timer
if applicable.
3.13.2
Full Time with No Prelube
For this type of lubrication system, when the compressor is instructed to start, the oil pump will start and run to
develop a minimum pressure differential. The pressure differential used in this type of system is not user adjusta-
ble. Additionally, if the capacity slide position is higher than the value of the
Maximum Capacity Slide to Allow
Start
parameter, the compressor will attempt to unload the capacity slide until the reading falls below the value of
the parameter. Once both conditions have been met, the compressor will be permitted to issue a start command.
The oil pump will stop if the compressor fails to start, but will otherwise run continuously for as long as the com-
pressor is in the running state. Once the compressor is stopped, either normally or due to a shutdown condition,
the oil pump will continue to run until the capacity slide has returned to its minimum position. If the compressor
was stopped normally, the oil pump will continue to run for a period of time defined by the
Oil Pump Postlube
Timer
if applicable.
3.13.3
Startup
For this type of lubrication system, when the compressor is instructed to start, the oil pump will start and run for
the period of time defined by the
Prelube Timer
, if applicable. During this prelube period, the oil pump must
develop adequate oil pressure so that the oil differential pressure falls within the range defined by the
Low Oil
Differential Pressure Shutdown
and the
High Oil Differential Shutdown
parameters. In addition, if the capacity
slide position is above the
Maximum Capacity Slide to Allow Start
parameter, the panel will attempt to unload the
compressor to a capacity slide position below this parameter. Both of these conditions must be satisfied prior to
the panel issuing a compressor start command. Once the compressor enters the running state, the oil pump will
be stopped.
Instruction Manual | GEA Omni™
Control panel
Control
Lubrication System
GEA Refrigeration North America, Inc. | E_806550_2 | Generated 12.01.2016
205
Summary of Contents for Omni
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