Inside This Issue TechFact

Inside This Issue TechFact
2nd Quarter 2003
Inside This Issue
? ?TechTips
??Evaporator Fan Blades
??Scroll Startup Logic
??Controller Analyzer
??Emergency Bypass Option
??Feature Article
Controller Analyzer
Vent Positioning Sensor
?? General
Carrier Transicold will soon be offering a selfcontained controller analyzer (pictured below). This
analyzer will test the MicroLink 2i controller along
with the soon to arrive MicroLink 3. This new tool
will assist in quickly diagnosing controller failures.
??Oil Filter Positioning
Scroll Start-up Logic
A new extended off-time start-up logic has been
implemented with software version 5313. If the
compressor has been off for 6 hours or greater it will
start in the reverse direction for 10 seconds, then cycle
off. After 60 seconds the compressor will start in the
forward direction. If the compressor has been off for
less than six hours the compressor will start in the
forward direction.
This logic applies to both control mode and pre-trip
mode tests, which require compressor operation (P6,
P7, P8, P10).
? P. Hoover
Availability will be announced with a service parts
bulletin later this year.
?? P. Hoover
Feature Article
Vent Positioning Sensor
Carrier Transicold now offers a vent position sensor
(VPS) option for the upper fresh air makeup vent.
This option adds the ability to record the position of
the vent in the Datacorder.
General Overview
The VPS allows the user to determine position of
the fresh air vent via function code 45. This new
function code is accessible via the code select key.
The vent position will display for 30 seconds whenever motion corresponding to 5 CMH (3 CFM) or greater is
detected. It will scroll in intervals of 5 CMH (3 CFM).
Scrolling to Function Code 45 will display the “Fresh Air Vent Position”. The display will be in either CFM
(English) or CMH (Metric), depending on the setting of code select 28. To display the alternate reading, press
the degree C/F key on the keypad. Once released, the display will return to the previous setting. Note, some
units are permanently configured to one setting or the other. On these units code select 28 cannot be changed.
Data Recording of the Sensor Position - The position of the vent will be recorded in the DataCorder whenever
the unit is running under AC power and the following occurs:
?? On every trip start
?? On every power cycle
?? Midnight
?? Manual change greater than 5 CMH (3 CFM) and remains in that position for 4 minutes. This provides
the user with the ability to change the vent setting without generating multiple events in the DataCorder.
Vent Position Sensor Alarm - The fresh air vent position sensor alarm (AL50) will occur if the sensor reading
is not stable for 4 minutes or if the sensor is outside of its valid range (shorted or open). This can occur if the
wing nut is loose or the panel is defective. To confirm a defective panel, assure that the wing nut is secure and
then power cycle the unit. If the alarm immediately reappears as active, the panel should be replaced. The
alarm should immediately go inactive, checking for the 4-minute stability requirement. If the alarm reoccurs
after the four minutes and the panel was known to have been stable, then the panel should be replaced.
Note, the user has 4 minutes to make necessary adjustments to the vent setting. This time begins on the initial
movement of the sensor. The vent can be moved to any position within the 4 minutes. On completion of the
first 4 minutes, the vent is required to remain in stable for the next 4 minutes. If vent position changes are
detected during the 4 minutes stability period, an alarm will be generated.
Vent Position Sensor Calibration (Only required when installing a new panel) - The vent position sensor is
calibrated using the keypad as follows:
Rotate the vent to the 0 CMH/ CFM position.
Code select 45 will automatically displayed. Press the Enter key and hold for 5 seconds.
After the enter key has been pressed ‘CAL’ for calibration is displayed.
Press the ALT MODE key on the display and hold for five seconds.
After the calibration has been completed, Code 45 will display 0 CMH / CFM.
Software version 5313 is required to operate this option.
? P.Hoover
Oil Filter Positioning
Question: I have an earlier model of the 69UG
undermount generator set which has a
horizontal oil filter arrangement. In order to
reduce the cleanup time from oil spillage
during my oil changes, can the filter housing be
rotated 90 to the vertical position?
11. Clean the threads of the sending unit and
install the sending unit (using thread sealer)
into the threaded hole from which the pipe
plug was just removed.
12. Reconnect both the low oil pressure switch
harness and the oil pressure sending wire.
13. Reconnect the positive battery cable.
14. Start engine and check for proper operation
and verify that there are no oil leaks.
Answer: Yes, the filter housing can be rotated
so that the filter is in the vertical position.
The repositioning of the oil filter housing can
easily be performed during the next scheduled
oil change by following the instructions below.
It is, however, suggested that both "O" rings be
replaced before reinstalling the housing, as a
precautionary measure.
Following is a recommended procedure for
switching the oil filter.
After the oil has been drained from the engine,
1. Disconnect the positive battery cable from
the battery
2. Remove the nut and wire from the oil
pressure-sending unit and save the nut for
reinstallation of the wire.
3. Remove the oil pressure-sending unit from
the housing and save.
4. Disconnect the harness from the Low Oil
Pressure Switch
5. Remove the 4 bolts securing the oil filter
housing to the engine block.
6. Remove the housing from the engine block.
7. Install new "O" rings.
8. Re-install the housing in the vertical
position making sure the "O" rings remain
09. Re-install the 4 housing bolts and torque to
(15 in-lbs).
10. Remove the pipe plug from the threaded
hole that is not being used. Using thread
sealer, reinstall the plug into the hole
that the oil pressure sending unit was
originally located.
? G. Barkowski
Emergency Bypass Option
The latest software revisions for the 69NT
Reefer units are as follows:
Scroll Units – 5313
Microlink 2 – 1207
Carrier Transicold has introduced the
emergency bypass option on its latest scroll
unit, EliteLINE model 69NT40-531-09. The
EBS (Emergency Bypass Switch) is located
inside the control box (pictured below).
The EBS bypass switch functions to bypass the
controller in the event of failure. Once
activated, it can operate in one of two modes of
Microlink 2i – 5124
Controlled Atmosphere – 3107
Model Number Multi Configuration Card – 1200402-71
Details on each of these can be viewed in the
information center on the Carrier Transicold
Web site at
? P.Hoover
Evaporator Fan Blades
When removing the black nylon evaporator fan
blade, care must be taken to assure that the
blade is not damaged. In the past, it was a
common practice to insert a screwdriver
between the fan blades to keep it from turning.
This practice can no longer be used, as the
blade is made up of a material that will damage.
It is recommended that an impact wrench be
used when removing the blade. Do not use the
impact wrench when reinstalling, as galling of
the stainless steel shaft can occur.
? P.Hoover
TechLine is a publication of Carrier
Editor: Perry Hoover
Graphics & Publications Coordinator:
D. Mansfield
Contributors: Gary Barkowski, Perry
Hoover, Zvonko Asprovski
Mode Switch
EBS Switch
operation, FULL COOL or FANS ONLY while
still using the system's safety devices (high
pressure switch, motor internal protectors, and
heat termination thermostat).
There are two switches that control the EBS
option, the EBS/NORMAL and the FAN/FULL
COOL switch. To activate the option, the EBS
switch is placed in the EBS position. Once in
the EBS, position the user can select either
FAN ONLY operation or FULL COOL
operation. Note, the unit will start in the
mode that the switch was last set. In the
“Evaporator Fans Only Operation”, the fan
motor contactor will energize, supplying power
to the fan motors. If the FULL COOL MODE
of operation is selected, the following will also
??The phase detection circuit will detect the
phase rotation and close the correct
contactor to provide power to the
compressor contactor.
??The condenser fan contactor will close to
start the condenser fan motor.
??The SMV will open to 100%.
To return the unit to normal control, the EBS
switch should be placed in the NORMAL
OPERATION position.
? Z Asprovski.
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