Section 1
Installation and servicing of refrigeration equipment can be hazardous due to system pressures and electrical components. Only trained and qualified service personnel should install, repair, or service refrigeration equipment.
The following general safety notices supplement specific warnings and cautions appearing elsewhere in this manual. They are recommended precautions that must be understood and applied during operation and maintenance of the equipment covered herein. The general safety notices are presented in the following three sections labeled: First Aid, Operating Precautions and Maintenance Precautions. A listing of the specific warnings and cautions appearing elsewhere in the manual follows the general safety notices.
An injury, no matter how slight, should never go unattended. Always obtain first aid or medical attention immediately.
Always wear safety glasses.
Keep hands, clothing and tools clear of the evaporator and condenser fans.
Wear appropriate personal protective equipment for the work being undertaken.
No work should be performed on the unit until all circuit breakers, start-stop switches are turned off, and power supply is disconnected.
In case of severe vibration or unusual noise, stop the unit and investigate.
Beware of unannounced starting of the evaporator and condenser fans. Do not open the condenser fan grille or evaporator access panels before turning power off, and disconnecting and securing the power plug.
Be sure power is turned off before working on motors, controllers, solenoid valves, and electrical control switches. Tag circuit breaker and power supply to prevent accidental energizing of circuit.
Do not bypass any electrical safety devices, e.g. bridging an overload, or using any sort of jumper wires. Problems with the system should be diagnosed and any necessary repairs performed by qualified service personnel.
When performing any arc welding on the unit or container, disconnect all wire harness connectors from the modules in both control boxes. Do not remove wire harness from the modules unless you are grounded to the unit frame with a static safe wrist strap.
In case of electrical fire, open circuit switch and extinguish with CO2 (never use water).
To help identify the label hazards on the unit and explain the level of awareness each one carries, an explanation is given with the appropriate consequences:
DANGER − Indicates an immediate hazard that WILL result in severe personal injury or death.
WARNING − Warns against hazards or unsafe conditions which COULD result in severe personal injury or death.
CAUTION − Warns against potentially hazardous or unsafe practices that could result in minor personal injury, product or property damage.
The statements listed below are applicable to the refrigeration unit and appear elsewhere in this manual. These recommended precautions must be understood and applied during operation and maintenance of the equipment covered herein.
EXPLOSION HAZARD: Failure to follow this WARNING can result in death, serious personal injury and / or property damage. Never use air or gas mixtures containing oxygen (O2) for leak testing or operating the product.
Charge Only With R−134a: Refrigerant must conform to AHRI Standard 700 specification.
Beware of unannounced starting of the evaporator and condenser fans. The unit may cycle the fans and compressor unexpectedly as control requirements dictate.
Do not attempt to remove power plug(s) before turning OFF start-stop switch (ST), unit circuit breaker(s), and external power source.
Make sure the power plugs are clean and dry before connecting to power receptacle.
Make sure that the unit circuit breaker(s) (CB-1 & CB-2) and the START-STOP switch (ST) are in the “O” (OFF) position before connecting to any electrical power source.
Make sure power to the unit is OFF and power plug disconnected before replacing the compressor.
Do not use a nitrogen cylinder without a pressure regulator.
Do not remove the condenser fan grille before turning power OFF and disconnecting power plug.
Always turn OFF the unit circuit breakers (CB-1 & CB-2) and disconnect main power supply before working on moving parts.
The unit power plug must be disconnected to remove power from circuit breaker CB1.
Before disassembly of any external compressor component make sure to relieve possible internal pressure by loosening the bolts and tapping the component with a soft hammer to break the seal.
Do not remove wire harnesses from controller unless you are grounded to the unit frame with a static safe wrist strap.
Unplug all controller wire harness connectors before performing arc welding on any part of the container.
Pre-trip inspection should not be performed with critical temperature cargoes in the container.
When Pre-Trip key is pressed, dehumidification and bulb mode will be deactivated. At the completion of Pre-Trip activity, dehumidification and bulb mode must be reactivated.
When a failure occurs during automatic testing, the unit will suspend operation awaiting operator intervention.
When Pre-Trip test Auto 2 runs to completion without being interrupted, the unit will terminate pre-trip and display “Auto 2” “end.” The unit will suspend operation until the user depresses the ENTER key!
The unit will remain in the full cooling mode as long as the emergency bypass switch is in the BYPASS position and the MODE SWITCH is in the FULL COOL position. If the cargo may be damaged by low temperatures, the operator must monitor container temperature and manually cycle operation as required to maintain temperature within required limits.
To prevent trapping liquid refrigerant in the manifold gauge set, be sure set is brought to suction pressure before disconnecting.
Removing the compressor motor press-fit stator in the field is not recommended. The rotor and stator are a matched pair and should not be separated.
The copper tube that connects to the oil suction strainer extends out the bottom with the bottom plate removed. Take precautions to avoid bending or breaking it while changing crankcase positions.
Ensure that the thrust washer does not fall off dowel pins while installing oil pump.
The set screw on the crankshaft must be removed for this type of oil pump. (See Figure 6-8.)
Use only Carrier Transicold approved Polyol Ester Oil (POE) − Castrol-Icematic SW20 compressor oil with R-134a. Buy in quantities of one quart or smaller. When using this hygroscopic oil, immediately reseal. Do not leave container of oil open or contamination will occur.
Take necessary steps (place plywood over coil or use sling on motor) to prevent motor from falling into condenser coil.
DO NOT disassemble piston from NEW suction modulating valve powerhead assembly. Doing so may result in damage to piston.
Unplug all controller connectors before performing arc welding on any part of the container.
The unit must be OFF whenever a programming card is inserted or removed from the controller programming port.
Do not allow moisture to enter wire splice area as this may affect sensor resistance.