View newsletter in pdf formatAugust 2010
A brief description of the topics in this newsletter is provided below.
DPRV Removal for ThinLINE® Units
The purpose of the DPRV on the ThinLINE® unit is to ensure compressor lubrication is maintained when operating under low load, low ambient conditions. As a result of extensive research conducted using the ML3 controller and the stepper suction modulation valve, we were able to qualify new software logic that improves oil management, allowing us to remove the DPRV and simplify the unit.
Troubleshooting Tips for PrimeLINE® Units
Troubleshooting the PrimeLINE units by performing the following checks: Liquid Injection Valve (LIV) check, Evaporator Pressure Transducer (EPT) and Suction Pressure Transducer (SPT) check, Digital Unloader Valve (DUV) coil check, Digital Unloader Valve (DUV) and Electronic Expansion Valve (EEV) check, Dome Temperature Sensor (CPDS) check.
Product Update - Reciprocating Compressor Sight Glass
In alignment with the EliteLINE® and PrimeLINE scroll units, Carrier Transicold has removed the oil level sight glass from the reciprocating compressor in the ThinLINE model units. This action was taken to eliminate unnecessary field adjustment of oil levels resulting in too much, or too little, oil being found in the system.
Product Update - Suction Modulation Valve (SMV)
The stepper motor suction modulation valve is used to regulate the flow of refrigerant. Signals are sent to the stepper motor inside this valve to open and close. By closing or opening, the valve increases or decreases pressure in the evaporator. This in turn raises or lowers evaporator temperature.
Product Update - Electronic Expansion Valve (EEV)
Starting with PrimeLINE models (69NT40-561-xxx / PID > 2009), the electronic expansion valve was changed. The complete assemblies are interchangeable but the coils that drive the valves are not.
Starting with software 5147 and 5347 (ML3 controllers), a new unit configurable defrost pulsing logic was implemented. As part of this logic, a new user selectable option was added to code select 27 (puls). When this mode of defrost is selected, the defrost interval will set to 6 hrs and cycle the evap fans on and off during defrost when the setpoint is -18.1° C (-0.6° F) and below
Listed are the remaining scheduled training schools for 2010. These schools are subject to a minimum requirement of 12 students to avoid cancellation. Please check to ensure the class has met this requirement prior to confirming your travel reservations.
Listed below are the most current software release versions for operating and working with Carrier Transicold container units. Prior to upgrading units you should seek agreement from the equipment owners.
Troubleshooting Tier 4i Engine Control Module
What does the blinking LED on the bottom of the engine control module mean on the Undermount and Clip On genset (69UG/RG-15) with PID’s greater than 1400? The blinking light is actually identifying a fault that has occurred with the operation of the engine. This indicator light will illuminate with different combinations of long and short flashing patterns, which can be used to identify the component that may have failed or has a fault.