Tecumseh CAJ Serie Instrucciones De Instalación página 10

The airborne hydrocarbon or HFO levels will be monitored throughout the entire refrigerant loading period and during maintenance.
The leak detection equipment will be calibrated to 20% of the LFL for the refrigerant in accordance with standard EN 378-4.
The work area will be ventilated during the entire operation.
6.1. Loading with refrigerant
The provisions indicated in parts 2, 3 et 4 of EN 378 must be applied to prevent the risk of an emission of refrigerant fluid during the
filling and purging operations of the refrigeration system.
Limit the refrigerant load so that the pressures lie within the operational window defined by Tecumseh.
Never start the compressor if the vacuum is not broken in HP and LP.
The components will be grounded prior to commencing refrigerant loading.
Weigh the load using suitable scales (accuracy +/-5 g). The hoses will be as short as possible to help with load accuracy.
The installation should be loaded with one or the other refrigerant for which the compressor has been designed only (see serial
label).
The refrigerant is always loaded in the liquid phase, in order to retain the correct mix ratio.
Never add any colorings or additives.
6.2. The risk of overloading with refrigerant
If the main parts of the compressor are immersed following an excessive refrigerant load, this may lead to a rupture of the
compressor housing.
Immersion of the motor, the casing, the piston and the cylinder in the fluid will create a hydraulic blockage preventing the
compressor from starting: therefore this is a blocked rotor situation.
If, for any reason whatsoever, the protection device for the compressor is not triggered quickly enough, an elevated current in the
motor coil will lead to a rapid increase in its temperature. This will cause vaporization of the liquid and a rapid increase in the
pressure inside the compressor housing which exceeds the limit.
By way of example of what you should never do while loading a system with refrigerant, never leave the loading cylinder connected
to the system, even if the cylinder valve or manifold valve is closed. If a slight leak is found in one of these valves, the system will be
overloaded by the risks indicated above.
6.3. The vapor effect
This phenomenon can arise when there is only one walled tube between the water and the refrigerant fluid (e.g., water evaporator)
and a leak is produced through this wall. The refrigerant leaks to the outside and the water enters the system, creating a vapor
effect. If there is no safety device in place to halt the operation of the refrigerant system, the compressor will behave like a vapor
generator, and the heating of the motor will increase the pressure above the maximum service pressure. The use of a high-pressure
safety switch is a means of limiting the pressure increase during operation.
6.4. Checks during commissioning and start-up
- Calibrate the protective electrical devices, adjust the set-points/cut-out of the regulation and safety devices.
- Fully open the service valves.
- Check the function of the oil heater, if one is installed.
Tecumseh compressors are protected by an external or internal protection device, with a principle based on a temperature/current
combination. As with any protection device, it is normal that this device will cut the power supply to the compressor if the
compressor functions outside of the ranges defined by the manufacturer.
When the operating regimes are stable, perform the following checks:
- Voltage and current absorbed by the compressor,
- High pressures and low pressures of the installation,
- Over-heating, under-cooling, gas return gas return temperature, discharge temperature,
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