1-22
Revised 8-6-93
P3-0 Low Speed Condenser Fan On
(If so Equipped) See P3-2.
P3-1 Low Speed Condenser Fan Off
(If so Equipped) See P1-1.
P3-2 High Speed Condenser Fan On
Amperage measurements are made after 15 seconds.
Failure is an indication that the motor is defective, or
didn’t start due to bad contactor or defective wiring.
Motor could also be heavily loaded (i.e. bad bearing).
P3-3 Condenser Fan Off
See P1-1.
P4-0 Low Speed Evaporator Motor Turned On
See P3-2 (1 Minute Test).
P4-1 Evaporator Motor Off
See P1-1.
P4-2 High Speed Evaporator Motor Turned On
See P3-2 (1 Minute Test).
P4-3 Evaporator Motor Off
See P1-1.
P5 Probe Tests
See P5-0 and P5-1, also, you should make note that
during the pre-trip test, codes P5-0 and P5-1 will be seen
only when a failure occurs.
P5-0 Return/Supply Probe Test
A temperature comparison is made between the
return and supply probes. High speed evaporator fans are
run for 8 minutes to eliminate air temperature
differences.
P5-1 Primary/Secondary Probe Test
(For unit with DataCORDER only) After 8 minutes,
the temperature difference between the primary and
secondary probe (supply and return) is compared to a
standard.
A failure may be due to some temperature extreme
which existed before the test started and the test should
be rerun. If still bad, check probes and connections and
possibility of airflow restriction.
P6-0 Compressor Started And Runs for 45 Seconds
Check for a minimum current increase is made.
A failure indicates a compressor motor problem, or
power source fault.
P6-1 Suction Modulation Valve Opening
The Modulation Valve is fully opened, for two
minutes unless restricted by the current limiting function.
A predetermined temperature difference, dependent
upon the valve position and box temperature is compared
to the supply and return probe readings.
A failure indicates low capacity. This could be due to
the modulation valve not opening as required, or some
other restriction in the line, such as the filter drier. If the
suction solenoid valve open test below fails, this would
indicate that another part of the system is bad (i.e.
compressor). There is the possibility that a probe is in
error, even if P5-0 passed.
P6-2 Quench Valve Test
NOTE
Some models have a thermostatic expansion
quench valve, so quench valve test is NOT
APPLICABLE for these models. To see which
models have a solenoid quench valve refer to
Section 5.
The compressor suction temperature is measured
with the quench closed (Modulation Valve is at 20%).
The quench is energized and the suction temperature
drop after 60 seconds is checked.
A failure indicates a defective quench valve or
improper wiring. Other possible causes are expansion
valve not seating properly, unit low on refrigerant charge,
or a faulty suction temperature sensor.
P6-3 Suction Modulation Valve (Closed)
The modulation and suction solenoid valve are
closed and the unit is run for 5 minutes. The return and
supply probe readings are to be within a range indicating
a minimal capacity.
A failure indicates improper closing of the valve. The
possibility of a faulty probe could also be examined.
P6-4 Suction Solenoid Valve (69NT40)
The suction solenoid valve is opened (Modulation
Valve closed). The supply and return probe temperature
difference is compared to a predetermined value.
A failure indicates low capacity. This could be caused
by the valve being defective or improperly wired. Also see
P6-2 above.
1.13.7 DataCORDER (Optional)
Carrier Transicold has developed a microprocessor
recorder for container refrigeration units which
eliminates the mechanical recorder and paper chart, and
replaces it with a solid state memory device capable of
recording at one hour intervals, for a period of 62 days of
continuous unit operation or, more practically, 120
calendar days average use.
This microprocessor temperature recorder, which
we have termed the “DataCORDER,” has many
additional capabilities which the old, mechanical chart
recorder did not have.
The following data is stored and can be displayed in
report form.
--- Trip Start Date
--- Initial Set Point Temperature
--- Supply Air Temperature
--- Return Air Temperature
--- Remote Probe Temperatures in the Container
(Cold treatment recording)
--- Set Point Temperature Changes
--- Power Outages
--- Alarm Occurrences
--- Defrost Occurrences
--- Pre-Trip Occurrences
--- Dehumidification mode
Trip start date is activated by simultaneously holding
both
Trip Start
and
Hours Since Last Trip Start
keys.
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