4000 Series
Page
32
of
41
3460006-17_serial series 5000000
The 1 indicates step 1 in profile 1. Other steps may be selected using the arrow
keys. Range step 1 to 10.
Press the advance key once. If 1 and P1 were left in the previous step then the lower display will
look like the figure below.
upper display
lower display
t1 is a temperature step, other options are in order when pressing the up arrow.
UStP
= unused step
SoAh
= Soak at a predetermined temperature for a period of time.
WE
= Wait for Event (No events are programmed, but are used to hold a temperature indefinitely.
WPr
= Wait for process. This step waits until the process temperature equals value set in this step before
proceeding to the next step.
Wbo
= Wait for both temperature and event. Do not use this type of step.
JL
= Jump Loop is used to move to a new step in a profile.
End
= End profile. As the unit is configured do not use the End type step unless stopping all control
functions is desired.
CLoC
= Starts a profile on a day of the week at a specific time,
Each one of the above steps incorporates other parameter which will require setting such as
temperature, hours, minutes, seconds, loop quantities. The available parameters will be displayed for
the particular step type during the profile setup. Further explanation can be found in the supplied Watlow
manual.
Overview of control system and usage of cabinet:
After the unit is turned on and a profile is selected the unit is ready to run the profile,
load the unit with product you wish to condition, close and latch the door. Press the start button. When
the start button is pressed the first items to occur are the liquid and hot gas solenoids energize along
with the evaporator fan via the Watlow control output D11 and Micro Controller output O2, releasing
refrigerant into the interstage heat exchanger. The condenser fan(s) and compressor turn on via 1-MS,
(the condenser fans are stage started on depending on the head pressure of the high stage compressor)
and the Watlow control lower display (green) ramps to the desired set point, a (1) at the bottom of the
display comes on solid indicating full cooling is taking place, if control point is below 5 degrees C a (3)
will light on the bottom of the display indicating the sub cooling solenoid valve has turned on adding
refrigeration capacity to the system, as the unit nears set point the (1) will begin flashing indicating the
control is reducing refrigeration capacity. When the unit stabilizes at set point the (1) may stop flashing
and a (2) may begin flashing indicating heat is being added to the system to maintain set point. During
a warming part of a profile the (1) will be off and the (2) will be on until nearing set point at which time
(1) and 2 may begin flashing.
t1
styp
