Operation Overview; Initial Setup Procedure; Compressor Start-Up Procedure; Compressor Stopping Procedure - Johnson Controls FRICK QUANTUM LX Operation

OPERATION OVERVIEW

INITIAL SETUP PROCEDURE

1. Compressor Confi guration should be per-
formed by a Factory Representative or Dis-
tributor to setup the customer specifi c con-
trol features which should not need to be
changed by operators.
2. Confi guration is performed to setup panel
features and options, which can later be
changed by an operator. Features such
as the panel time, and screen saver are
changed here. Options such as Condenser
Control are enabled here. The operator can
avoid viewing and entering settings of un-
used controls by keeping unused options
disabled.
3. Calibrate the control devices.
4. Enter and setup all control settings.
5. Establish the desired access rights of the
operators.
6. The Operating Status screen now provide
quick access to the most important infor-
mation and controls of the compressor unit
and the subsystems.

COMPRESSOR START-UP PROCEDURE

• Starting is shown for the Compressor status
on the Operating Status screen.
• All the safeties are checked. If any shutdown
condition is present the corresponding
alarm message is shown and the compres-
sor is prevented from starting.
• If the compressor type has been set to Oth-
er Compressor:
• The oil lubrication is checked. A Pre-
lube pump needs a 5 lb. oil pressure
differential to allow the compressor to
start. A full time pump needs a 20 lb.
Oil Pressure differential to allow the
compressor to start. Other compres-
sor manufacture's Oil Pumps needs a
30 lb. Oil Pressure differential to allow
the compressor to start. If one of these
conditions is not present an alarm mes-
sage is issued and the compressor is
prevented from starting.
• The Slide Valve position is checked to see if
it is less than or equal to the Highest Slide
Valve Position to allow starting the com-
pressor setpoint. If the Slide Valve position
is higher than this, the compressor is pre-
vented from starting.
• If none of the above conditions has prevent-
ed the compressor from starting, a timer
delay is started that requires the starting
QUANTUM™ LX COMPRESSOR CONTROL PANEL
OPERATION
conditions to remain satisfi ed for a period
of fi ve seconds for all compressor model
types except [Other Compressor Manuf].
The Other compressor model type uses a
20 seconds delay. After the time delay the
compressor and the Recycle Delay timer are
started.
• If within 30 seconds, the Compressor Start
Auxiliary input has not been energized,
or Motor Current is not detected, then an
alarm message is issued and the compres-
sor is shut down.
• When the compressor begins running, the
Oil Pressure values are in a state of change.
For a period of 10 seconds after the com-
pressor status switches to Running, the low
Oil Pressure alarm and shutdown safeties
are ignored.

COMPRESSOR STOPPING PROCEDURE

During the compressor stopping, the Slide Valve
unload solenoid remains energized until the Slide
Valve is unloaded to or below the Highest slide
valve position to allow starting the compres-
sor setpoint. If the Slide Valve does not unload
below this setpoint within 5 minutes, the alarm
message Compressor Unable to Unload - Alarm
is issued.

SETUP FOR AUTOMATIC CONTROL

In order to operate a compressor at peak effi -
ciency, under full load and part load conditions
complex control sequences must be used. In or-
der to obtain the effi ciencies, Automatic Control
is almost mandatory. Automatic control of the
Slide Stop and Slide Valve increases the com-
pressor effi ciency over a wide operating range.
The following steps (which are relevant) should
be taken to control in Automatic:
• The compressor should be in automatic (au-
tomatic cycling) so the compressor will start
and stop according to the Autocycle set-
points.
• The Oil Pump should be in auto because its
operation coincides with that of the com-
pressor.
• The Slide Valve and the Slide Stop should
be in Automatic so they are controlled by
setpoints and internal control logic.
Note: If there is a shutdown in response to a
safety setting, a compressor in Automatic mode
is placed into Manual mode requiring operator
intervention.

REMOTE CONTROL OF THE COMPRESSOR

The following digital outputs and inputs (on Digi-
tal Board 2) have been provided that can be used
090.022-O (MAY 12)
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