AG/TAG
10
SP6024 ind C
The components will be grounded before starting the refrigerant charge.
Load the installation only with the refrigerant or one of the refrigerants for which the compressor was designed (see nameplate).
The refrigerant charge will always be in liquid form, to keep the mixture in the right place.
- Do not add any additives or dyes.
6.3. Risk of refrigerant overload
If the main parts of the compressor are submerged due to too much refrigerant, this can cause the compressor housing to split.
Immersion of the engine, connecting rod, piston and cylinder in the liquid creates a hydraulic blockage preventing the compressor
from starting this is therefore a blocked rotor situation.
If, for some reason, the compressor protector does not intervene quickly enough, a high current in the engine coil will create a rapid
rise in temperature. This will cause the liquid to vaporise and the pressure in the compressor housing to increase rapidly.
As an example of what not to do when charging a system with refrigerant, never leave the charging cylinder connected to the system,
even if the valve of the cylinder or that of the "manifold" is closed. If one of these valves leaks slightly, the system will be overloaded
with the risks mentioned above.
6.4. Checks when commissioning
- Calibrate electrical protective organs, adjust the set/cut points of the regulatory and safety organs.
- Fully open the service valves.
- Check the operation of the oil heater, if present.
Tecumseh compressors are protected by an external or internal protective organ, the principle of which is based on a
temperature/current combination. Like any protective body, it is normal for the compressor to shut off power when it is operating
outside the manufacturer's defined ranges.
When operating plans are stabilised, do the following checks:
-Tension and intensity absorbed by the compressor;
-HP and BP pressures from the installation;
-Overheating, undercooling, gas return temperature, discharge temperature;
-Search for leaks;
-Carry out a general inspection of the installation (cleanliness of installation, abnormal noise, etc.). Visually inspect the
refrigeration system (for example, according to the list listed in Annex G of EN378-2).
For installations operating with a flammable refrigerant, check if the leak detection equipment is working properly.
Do not add oil unless the pipes exceed 20 m; in this case, use the oil recommended by Tecumseh.
6.5. Maintenance
Tecumseh recommends securing the maintenance area in accordance with EN 378 Part 4
Below is a non-exhaustive list of recommendations:
-Obtain a permit for high-temperature work (if necessary);
-Ensure that no flammable material is stored in the work area and that there are no sparks in the work area;
-Switch off electrical appliances;
-Keep heat sources away to avoid explosions;
-If a heat source is present in the workplace, make sure a fire extinguisher is available;
-Ensure that the work area is properly ventilated, before intervening on the refrigeration system or before welding or tender
brazing work;
-Mark the work area to prevent entry of unqualified people;
-Ensure that the leak detection system used is spark-proof, secured appropriately or inherently safe
-Ensure that all maintenance personnel have been trained.
