304 C – 02/06 D – pag. 14/16
Start up and shut down
Pre start-up
•
With main switch Q10 open, check all electrical connections in control panel and starter to be sure they are
tight and provide good electrical contact. Although connections are tightened at the factory, they may have
loosened enough in shipment to cause a malfunction.
•
Verify that the automatic circuit breaker Q9 is in OFF position.
•
Check and inspect all water piping. Make sure flow direction is correct and piping is made to correct
connection on evaporator and heat recovery exchanger.
•
Check for inlet/outlet piping proper connections as indicated on the exchangers.
•
Open all water flow valves to the heat recovery exchanger and evaporator.
•
Check all pipings for leaks. Vent the air from the evaporator and heat recovery exchanger water circuit. The
cooler circuits should contain clean and non corrosive water.
•
Check pressure drop across evaporator and heat recovery exchanger, and see that water flow is correct for
design flow rates and data.
•
Check the actual unit line voltage to be sure it is the same you can read on the compressor nameplate within
±
10% and that phase voltage unbalance does not exceed 3%.
•
Verify that adeguate power supply and capacity is available to handle load.
Start-up
Start-up must be performed by specialized personnel:
1. Open the compressor suction and discharge shut-off valves; always replace seal caps.
2. Open the manual liquid line shut-off valve.
3. Check to see that the automatic circuit breaker Q9 is in the OFF position.
4. Check to see that the main switch Q10 (unit ON/OFF switch) is in OFF position.
5. Verify crankcase heaters have operated at least 12 hours before start-up. Crankcase should be warm.
6. Start the auxiliary equipment for the installation by turning on the time clock, ambient thermostat and/or
remote ON/OFF switch cooling and chilled water pump.
7. Check all the safety control.
8. Switch the main switch Q10 to ON.
9. Start the system by switching the unit circuit breakers Q9 to ON.
Emergency stop
A red switch is provided on control box, to allow the unit emergency stop. The unit must be restarted following this
procedure:
1. Reset emergency stop switch Q11.
2. Repeat start-up procedure from beginning.
