Ingersoll-Rand Thermo King CRR DF MPC2000, Maintenance Manual

Page: 78 / 165

Microprocessor Controller
77
PTI (Pretrip) Test
The CRR DF controller contains a special PTI pretrip test that automatically checks unit refrigeration
capacity, heating capacity, temperature control, and individual components including the controller
display, contactors, fans, protection devices and sensors. The test includes measurement of component
power consumption and compares test results to expected values.
NOTE: Correct all existing alarm conditions and clear the alarm codes before performing a PTI test.
The controller will automatically clear all existing alarms before beginning the PTI test.
During the PTI test, the LED display screen will show:
• “P1” for PTI test and the current step of the test (e.g. “01”).
• Alarm LED flashes if an alarm condition occurs during the test.
NOTE: Detailed PTI test results are stored in the Datalogger for later viewing. Any alarm codes
recorded during the test can be viewed through the controller’s Alarm List menu at the end of the test.
NOTE: Auto PTI test omits HPCO test on R134a and R23 compressor, and cooling capacity is not
verified by minimum temp difference between supply and return. Manually verify function HPCO
functions and full cooling capacity.
CAUTION: The PTI test should only be performed on an empty container!
CRR Pretrip (PTI) Test Procedure
LED
Display
(Test No.)
LCD Display
(Shows Approx. Amps for
460V, 60 Hz Unit) Test Description
Possible
Alarms
Duration
(Time)
P1.00
Display Test
Activated
0.1 A 0.0 A 0.1 A
Event Log for PTI begins. All alarms are
turned OFF. Alarm list is cleared. All
lights and bars in display turn ON.
None 10 Seconds
P1.01
Sensor Test
Activated
0.1 A 0.0 A 0.1 A
All sensors must have values within their
measuring range. Power supply voltage
and frequency must be Ok.
00, 01, 02,
03, 04, 05,
32, 33, 34,
35, 97, 98,
112
10 Seconds
P1.02
Heat Test
Activated
10.4 A 10.3 A 10.4 A
Electric heaters are turned ON. Amp
draw is measured and compared to
voltage:
• 8.8 Amps approx. at 400V;
• 10.2 Amps approx. at 460V.
Amperes are recorded in PTI log.
10, 11 10 Seconds
P1.03
Defrost
Activated
10.4 A 10.3 A 10.4 A
If evaporator sensor is below +10 C (50
F), heat remains on until evaporator
sensor r18 C (65 F).
20
1 Hour
Maximum
P1.04
Evaporator Fan High
Activated
1.6 A 1.5 A 1.6 A
Condenser fan and compressor are
turned OFF. With evaporator fan on high
speed, Amp draw is measured and
compared to voltage and frequency:
• 1.2 Amps approx. at 50 Hz, 1.6 Amps
approx. at 60 Hz Amperes are
recorded in PTI log.
12, 13 10 Seconds