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PRELIMINARY CHECKS
4 - PRELIMINARY CHECKS
Check that all drain and purge plugs are in place and well tightened prior to fill the installation with water.
4.1 - LIMITS
Prior to any operation, please checks the operation limits of the unit given in the «ANNEXES» at the end of the IOM,
page 55 to 62.
These tables will give you all necessary information concerning the operating envelop of the unit.
Please consult the «
«ANNEXES» at the end of the IOM, pages 63& 64, or supplied with the unit.
4.2 - REFRIGERATION CIRCUIT CHECKS AND RECOMMENDATIONS
In case of split units, check the installation has been made according to the recommendation described §
Installation.
The unit refrigeration circuit sketch is given in the «ANNEXES» at the end of the IOM, page 65 to 69 or supplied
with the unit.
4.3 - HYDRAULIC SYSTEM INSTALLATION CHECKS
The unit hydraulic sketch is given in the «ANNEXES» at the end of the IOM - See page 50 to 54.
4.4 - INSTALLATION OF EXTERNAL HYDRAULIC COMPONENTS (supplied loose by Lennox).
Some hydraulic components may be supplied loose by Lennox:
- Filters
- Expansion vessels
- Valves
- Manometers
- ...
The components are located inside the units and must be installed by a qualified engineer.
Note : In case of plate heat exchangers it is mandatory that a filter is installed at exchanger unit entrance.
These filters must remove all particles with a diameter greater than 1 mm.
4.5 - CHECK LIST BEFORE START-UP
Before proceeding with start up, even for a test of short duration, check the following points, after having
made sure that all the valves on the refrigeration circuit are fully open (discharge valves and liquid valves).
Starting up a compressor with the discharge valve closed will either trip the HP safety switch, or blow the
cylinder head gasket or the internal pressure safety disc.
1) The liquid pump(s) and other apparatus interlocked with the unit (coils, air handling units, dry coolers, cooling
towers, terminals such as fan coil units, etc.) are in working order as required by the installation and according
to their own specific requirements.
Place all water valves and refrigerant valves in their operating positions and start the water circulating
pumps.
Ensure main power supply is isolated before any work is started. Ensure unit is correctly earthed and
that earth continuity is correctly done.
Check that anti-vibration mountings are correclty installated and set.
2) Check the cleanliness and the tightness of all electrical connections, both the connections made at the
factory and the connections made on site. Also make sure that all thermostat bulbs are correctly inserted and
• 18 •
Risk analysis and hazardous situations according to 97/123 directive»
Installation - Operation - Maintenance manual (IOM) • AIR COOLED CHILLERS & SPLIT UNITS - 0105-E
given in the
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