CRR-20 & CRR-40, September 1999
Operating Instructions
Pretrip Inspection
3-5
2.
Check controller setpoint for proper setting. Adjust if
necessary.
3.
Check the direction of the condenser airflow (see
“Condenser Fan and Evaporator Fan Rotation” in the
Electrical Maintenance chapter of this manual).
4.
Check direction of evaporator airflow (see “Condenser
Fan and Evaporator Fan Rotation” in Electrical
Maintenance chapter of this manual).
5.
Perform a Full (or Extended) Pretrip Test and check unit
modes while the unit pre-cools:
NOTE: An Extended Pretrip test can take up to 7
hours to complete.
• Press the PRETRIP key. The left display flashes
“ENTER” and the right display flashes “PTRIP”.
• Press the ENTER key. “LOAD PTRIP” briefly appears
in the display.
NOTE: If Alarm Code(s) are stored in the con-
troller when the ENTER key is pressed, the dis-
play briefly shows “CLEAR ALARM”. The display
then returns to the Standard Display. Correct the
alarm condition(s) and clear the alarm code(s)
before attempting a Pretrip Test.
NOTE: To perform an Extended or Single Pretrip
Test, see “Pretrip Tests” in the
µµ
P-D Controller
chapter of this manual.
• The controller then performs the Full (or Extended)
Pretrip Test.
NOTE: If the container temperature is below 0 C
(32 F), the controller places the unit in the HEAT
mode when a Full or Extended Pretrip Test is ini-
tiated. The test begins when the container tem-
perature increases to 0 C (32 F).
• Observe the unit for proper operation and functions dur-
ing pretrip test.
• If the unit passes the Full Pretrip test, “PTRIP PASS” is
stored in the datalogger memory and the unit returns to
normal operation. A Start of Trip (SOT) marker is also
recorded in the data logger memory when an automatic
Full or Extended Pretrip is successfully completed.
• If an operating problem is encountered during the Full
Pretrip Test, the Alarm LED will turn ON, “PTRIP
FAIL” is stored in the datalogger memory and the unit
returns to normal operation (unless a shutdown fault has
occurred). View and correct any alarm conditions. Then
clear the Alarm Code(s) and repeat the pretrip test.
NOTE: PASS or FAIL is recorded in the datalog-
ger memory and can be viewed through the con-
troller’s VIEW/LOG/PT1 submenu. For instruc-
tions on viewing the VIEW/LOG/PT1 submenu,
refer to “Viewing Information in the View Menu”
in the
µµ
P-D Controller chapter of this manual.
NOTE: Clear the Alarm codes ONLY after the
alarm codes are documented and problems
repaired. Clearing the codes erases them from
the display memory of the controller.
However, a permanent record of the alarm
codes remains stored in the datalogger memory
of the controller for retrieval via PC-PAC™ soft-
ware.
WARNING: Some unit malfunctions will cause an
Alarm and unit shutdown condition. When the
alarm codes are cleared, the unit will start auto-
matically.
6.
Allow the unit to operate in the cool mode for 30 minutes
before loading the container. This will remove residual
container heat and moisture, and pre-cool the container
interior.
7.
Enter trip ID information into the controller memory using
the PC-PAC™ software (see instructions of PC-PAC™
software).
8.
Set the fresh air vent to the desired air exchange rate.
NOTE: If Dehumidification is turned ON, the
fresh air vent should be closed.
9.
Optional: Operate the humidity system (see “Humidify
Mode” on page 4-39). Verify that the air compressor
operates and that water is drawn into the atomizing nozzle
and injected into the return air stream (see “Humidify
System” on page 7-7).
10. Install a new chart and prepare the recording thermometer
for temperature recording (if so equipped):
• Wind the chart drive on the recording thermometer
(Partlow recorders).
• Check the battery charge on the recording thermometer
(Saginomiya recorders).
11. Stop the unit by moving the On/Off switch to the OFF
position.
Summary of Contents for CRR-20
Page 4: ......
