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. When working on refrigeration equipment, observe all potential Danger, Warning and Caution hazards, including those shown below and on hazard labels attached to the unit.
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 and 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, 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 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 - means an immediate hazard that WILL result in severe personal injury or death.
WARNING - means to warn against hazards or unsafe conditions that COULD result in severe personal injury or death.
CAUTION - means to warn against potential hazard or unsafe practice that could result in 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 refrigerants R-134a or R-513A as specified for the unit model number: 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 the 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.
Before disassembly of the compressor, be sure to relieve the internal pressure very carefully by slightly loosening the couplings to break the seal.
Do not use a nitrogen cylinder without a pressure regulator.
Do not open the condenser fan grille before turning power OFF and disconnecting power plug.
Oakite No. 32 is an acid. Be sure that the acid is slowly added to the water. DO NOT PUT WATER INTO THE ACID - this will cause spattering and excessive heat.
Wear rubber gloves and wash the solution from the skin immediately if accidental contact occurs. Do not allow the solution to splash onto concrete.
Always turn OFF the unit circuit breakers (CB-1 & CB-2) and disconnect main power supply before working on moving parts.
Installation requires wiring to the main unit circuit breaker, CB-1. Make sure the power to the unit is off and power plug disconnected before beginning installation.
Before powering on the unit, it is important to ensure that all dismantling work is done and tools are away and service personnel are not working on the unit at the time of power on.
Before removing the Supply or Return air sensors from the unit, turn the ON/OFF switch and circuit breaker to the OFF position. Disconnect the power plug from the unit. Follow proper lockout/tagout procedures to ensure the power cannot inadvertently be energized. It is important that all dismantling work is done and tools and personnel are away from the unit before powering on the unit for calibration.
When performing the Return Air Sensor calibration, disconnect both evaporator motors.
When charging the unit with R-513A refrigerant, charge as a liquid only. R-513A is an azeotrope blend containing R-1234yf and R-134a. Charging or topping off as a vapor will result in an incorrect mixture of blend in the system.
Charge water-cooled condenser or receiver according to nameplate specifications to ensure optimal unit performance.
Do not remove wire harnesses from circuit boards unless you are grounded to the unit frame with a static safe wrist strap or equivalent static drain device.
Remove the controller module and unplug all connectors before performing any arc welding on any part of the container.
Do not attempt to use an ML2i PC card in an ML3 equipped unit. The PC cards are physically different and will result in damage to the controller.
Pre-trip inspection should not be performed with critical temperature cargoes in the container.
When PRE-TRIP key is pressed, economy, dehumidification and bulb mode will be deactivated. At the completion of pre-trip activity, economy, dehumidification and bulb mode must be reactivated.
When condenser water flow is below 11 lpm (3 gpm) or when water-cooled operation is not in use, the CFS switch MUST be set to position “1” or the unit will not operate properly.
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 EB switch is in the On position and the Mode Switch is in the Full Cool position. If the cargo can be damaged by low temperatures, the operator must monitor container temperature and manually cycle operation as required to maintain temperature within required limits.
Allowing the scroll compressor to operate in reverse for more than two minutes will result in internal compressor damage. Turn the Start-Stop switch OFF immediately.
To prevent trapping liquid refrigerant in the manifold gauge set, make sure set is brought to suction pressure before disconnecting.
The scroll compressor achieves low suction pressure very quickly. Do not use the compressor to evacuate the system below 0 psig. Never operate the compressor with the suction or discharge service valves closed (front seated). Internal damage will result from operating the compressor in a deep vacuum.
Take necessary steps (place plywood over coil or use sling on motor) to prevent motor from falling into condenser coil.
Do not remove wire harnesses from module unless you are grounded to the unit frame with a static safe wrist strap.
Unplug all module connectors before performing arc welding on any part of the container.
The unit must be OFF whenever a programming device is inserted or removed from the controller programming port.
Use care when cutting wire ties to avoid nicking or cutting wires.
Do not allow moisture to enter wire splice area as this may affect sensor resistance.