Tecumseh AJ2 Série Notice D'installation page 24

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. 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,
- Perform a search for leaks,
- Carry out a general inspection of the installation (cleanliness, unusual noises, etc.), Perform a visual inspection of the
refrigerating system (e.g. according to the list provided in Annex G of standard EN378-2).
For installations which run using a flammable refrigerant fluid, where necessary, check that the leak detection equipment functions
correctly.
Do not add oil unless the pipes are longer than 20 m; if this is the case, use oil recommended by Tecumseh.
6.4. Maintenance
Tecumseh recommends that the maintenance zone is secured in accordance with standard EN 378 Part 4.
A non-exhaustive list of recommendations is provided below:
- Obtain the permit for working at high temperatures (where applicable);
- Make sure that no flammable materials are stored in the work area and that there is no source of sparks in the work area;
- Disconnect electrical appliances from the main power supply;
- Remove sources of heat to prevent an explosion;
- If a heat source is present in the work place, ensure that a fire extinguisher is provided;
24