Disabled - A zero (0) has been entered for the
sequence order, which disables this output from being
turned on.
The digital control settings on this screen are useful for
sequencing condenser fans and pumps. The following set
points are required:
Upper Dead Band - A Discharge Pressure band
above the Condenser Control setpoint at which the
condenser digital outputs will neither be turned on or
turned off.
Lower Dead Band - A Discharge Pressure band
below the Condenser Control setpoint at which the
condenser digital outputs will neither be turned on or
turned off.
Upper Delay- The minimum time in seconds that the
system Discharge Pressure must be at or above the
Condenser Control setpoint plus the upper dead band
before an output is turned on. This timer is used to
allow the system to respond to the change in the
amount of condensing. If the pressure falls below this
pressure for any reason at any time, the start time
delay will be reset to start counting again if needed.
Lower Delay - The minimum time in seconds that the
system Discharge Pressure must be at or below the
Condenser Control setpoint, minus the lower dead
band before an output is turned off. This timer is used
to allow the system to respond to the change in the
amount of condensing. If the pressure rises above
this pressure for any reason at any time, the start time
delay will be reset to start counting again if needed.
Sequence Order - A number will indicate the order in
which the condenser output is turned on. Sequencing
starts from 1, and goes up in numerical order.
Stopping of condenser devices is in reverse order of
the starting. The number zero (0) should be entered
to disable that device from being sequenced on. A
condenser output that is given a zero (0) will be
immediately turned off. The following condenser
outputs require a setpoint for a sequence position:
• Condenser Output #1
• Condenser Output #2
• Condenser Output #3
• Condenser Output #4 - If digital control is
selected, this output is sequenced using the
digital control setpoints. When analog control
is selected, the output is coupled with the
analog output.
An Analog Control data box is shown if analog control is
selected. The status of condenser output #4 is shown in
the analog data box along with the relative percent value
of the analog output signal.
The following analog control settings are required:
Upper Dead Band - A Discharge Pressure band
above the Condenser Control setpoint at which the
condenser analog output signal will neither be
increased or decreased.
Lower Dead Band - A Discharge Pressure band
below the Condenser Control setpoint at which the
condenser analog output signal will be neither
increased or decreased.
Response Time - A response time of 1 to 20 refers to
the relative time in seconds it takes to raise the
analog signal to its maximum output if the system
Discharge Pressure is greater than or equal to the
Condenser Control setpoint plus the analog control
upper dead band. The response time is also used as
the relative time in seconds it takes to lower the
analog signal to its minimum output if the system
Discharge Pressure is less than or equal to the
Condenser Control setpoint minus the analog control
lower dead band. A response time of 1, is the slowest
and 20 is the fastest.
A toggle key is provided that changes when the condenser
control is active:
[Condenser Active Always] - Selects the Condenser
Control to be active always even when the
compressor is not running.
[Condenser Active Running] - Selects the
Condenser Control to be active only when the
compressor is running.
[Not Active] - Selects the Condenser Control to be
currently not active.
Digital Condenser Control
The following is a description of the Condenser Control
logic when only digital condenser control is enabled.
If the System Discharge Pressure is above the
condenser control setpoint the following is repeated
until all condenser outputs are turned on:
• If the System Discharge Pressure continues to
rise and is greater than or equal to the
Condenser Control setpoint plus the digital
control upper dead band, then the next
condenser output is turned on. When a
condenser output is turned on, the upper delay
time is used to set a timer that must time out
before the next condenser output will be turned
on.
If the System Discharge Pressure is below the
Condenser Control setpoint the following is repeated
until all condenser outputs are turned off:
• If the System Discharge Pressure continues to
fall and is less than or equal to the Condenser
Control setpoint minus the digital control lower
dead band, then the last condenser output that is
on, is turned off. When a condenser output is
turned off, the lower delay time is used to set a
timer that must time out before the next
condenser output will be turned off.
S90-010 O FRICK QUANTUM™ COMPRESSOR CONTROL PANEL
Page 48 OPERATION
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