Frick QUANTUM - Evaporator I;O Status Box; Defrost & Heating Status Box; Analog Readings Box

FRICK QUANTUM EVAPORATOR CONTROL PANEL S90-600 O
OPERATION Page 11
an operator to acknowledge it and allows the
zone to continue its operation.
An Alarm message indicates an Alarm point has been
reached, or exceeded. Select the [Alarms/Shutdown]
key from the “Main Menu” screen for details. For additional
shutdown information, select the [Alarms/Shutdown] key
from the “Main Menu” screen and then the
“Alarms/Shutdowns History” screen.
EVAPORATOR I/O STATUS BOX:
The present operating status of the Inputs and Outputs
are shown. One of the following messages is shown:
· On – The input or output is energized or turned
on.
· Open – The input or output is energized to open
a valve.
· Off - The input or output is de-energized or
turned off.
· Closed – The input or output is de-energized to
close a valve.
The following outputs control valve operation used for
cooling and defrosting. They are shown in the first block (if
they were enabled during the board setup).
· Liquid
· Suction
· Hot Gas
· Bleed
The following outputs are used for cooling, defrosting and
heating. They are shown in the second block (if they were
enabled during the board setup).
· Fan Low – (enhanced unit only)
· Fan High
· Soft Hot Gas – (enhanced unit only)
· Humidity – (enhanced unit only)
· Alarm
The following inputs are possible. They are shown in the
third block (if they were enabled during the board setup).
· Enable /Disable - The unit can be enabled or
disabled through the “Enable /Disable” digital
input. When disabled (the input is de-energized,
or off), the unit is said to be off, that is all valve
station solenoids as well as fan motor starter(s)
are de-energized. When enabled (the input is
energized, or on) the unit is controlled to
maintain desired temperature conditions as well
as defrosting as required. For an example, this
input could be energized when there is
refrigeration compressors ready to start or
coolant liquid is available.
· Demand Defr. (Defrost) - The demand defrost
sensor is mounted on the evaporator tubing. This
sensor utilizes an infrared eye that can be
adjusted for the selected sensitivity to detect the
amount of frost buildup on the evaporator tubing.
As the sensor detects the frost, a contact is
closed which signals the “Demand Defrost” input.
A demand defrost signal will override the
refrigeration counter.
· Fan Aux. – This is an auxiliary input signal from
a fan starter that confirms when the fan is
running. – (enhanced unit only)
· Freezer Door – The opening and closing of the
freezer door affects room temperature. This input
signal is used to indicate whether the freezer
door is opened or closed. To avoid an
unnecessary supply of power, fans are turned off
when the freezer door is opened. – (enhanced
unit only)
· Fire /Ammonia – This input is used for signaling
when there is a fault such as in the engine room
which will affect the operation of the zone control.
For fail safe operation this input is energized
when there is no problem and de-energized on a
fault such as a fire or ammonia leak.
The following information is shown on the right side of this
screen:
DEFROST & HEATING STATUS BOX:
Current Stage – The following stages of defrost are
possible if they are enabled:
· Off
· Defrost Pending
· Pump out
· Soft Hot gas – (enhanced unit only)
· Hot gas
· Bleed
· Fan Delay
5
Stage Time Remaining – The time in minutes remaining
until the current stage is completed.
Initiated by – If in defrost, the method used to initiate the
defrost is shown:
· Defrost button – The operator pressed the
defrost key at the panel.
· Defrost schedule – The Defrost schedule has
the current time entered for defrost.
· Digital input – The demand defrost digital input
was enabled to be used as a signal for initiating
defrost and is currently energized.
· Liquid Counter - Liquid override is enabled and
the refrigeration counter is greater than the
counter setpoint.
ANALOG READINGS BOX:
The following analog input readings are possible. They
are shown if they were enabled during the board setup.
· Return Air Temperature
· Discharge Temperature
· Room Temperature
· Suction Temperature – (enhanced unit only)
· Humidity (%) – (enhanced unit only)
· Ammonia – (enhanced unit only)
· Motor Amps (Amps) – (enhanced unit only)
The following analog output readings are possible. They
are shown if they were enabled during the board setup.
· Variable Fan (%)
· Modulating Valve (%) – (enhanced unit only)