QUANTUM™ HD COMPRESSOR CONTROL PANEL
OPERATION
090.040-O (MAR 12)
Page 112
are enabled by putting a number (1-4) into the
Step Order setpoint boxes. These determine the
order that the modules are turned on or off. If a
Module has a 0 (zero) as its Step Order setpoint,
it is disabled from the control process.
Speed Control
• Disabled
• Enabled
FAN SPEED CONTROL
Proportional Band – The range over which the
PI control will be managing the Variable Speed
Fan (provided Integration Time is not set to zero,
in which case it will be strictly proportional).
Integration Time – This setpoint controls the
infl uence that the Integral component exerts
on the PI Output value. The Integral component
works to push the Control Input toward the Con-
trol Setpoint by tracking the difference between
the Control Input and the Control Setpoint over
time.
High Limit – The percentage of the 4-20mA sig-
nal which should be considered full On (usually
100%).
Low Limit – The percentage of the 4-20mA sig-
nal which should be considered full Off (usually
0%).
STEP CONTROL
[Step Up Deadband] and [Step Up Delay] –
When the System Discharge Pressure stays
above the combined values of the Condenser
Control Setpoint plus the Step Up Deadband for
the amount of time as set in the Step Up Delay,
the next module in the Step Order will turn on.
[Step Down Deadband] and [Step Down Delay]
– When the System Discharge Pressure stays
below the difference of the values for Condenser
Control Setpoint minus the Step Down Dead-
band for the amount of time as set in the Step
Up Delay, the next module in the Step Order will
turn off.
[High Pressure Override] and [High Pressure
Override Delay] - When the System Discharge
Pressure goes and stays at or above the High
Pressure Override value for the amount of time
as set in the High Pressure Override Delay, all
modules will turn on.
WET BULB CONTROL
Wet Bulb Approach – This is a value to be en-
tered by the facilities refrigeration engineer,
which will be added to the Wet Bulb Tempera-
ture to determine the Control Temperature.
Minimum Condensing Pressure –This value
specifi es the lowest condenser control pres-
sure that is permitted while the wet bulb control
strategy is in use.
Refrigerant – Select the type of refrigerant that
is being used in the compressor.
• R22
• R134a
• R717
• R744
Outside Air Temperature – The value shown
here is the actual Outside Air Temperature.
Outside Relative Humidity – The value shown
here is the actual Outside Relative Humidity.
Wet Bulb Temperature – The value shown here
is the calculation of ambient air temperature and
relative humidity to arrive at a Wet Bulb value.
This value is used in calculating the Control Set-
point when Wet Bulb is enabled.
Saturated Control Temperature – The value
shown here is the Saturated Control Tempera-
ture.
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