Trane Modular 20 to 35 Tons Manual de instalación descargar pdf (Pagina 21)

CXRC-SVX01F-EN 21

Start-Up and Shutdown

Start-Up

When wired properly, the unit will cycle condenser fans in

response to compressor interlock or the Intellipak

controller output.The Intellipak controller reads saturated

refrigerant temperatures and cycles the fans

appropriately.Typical wiring schematics are listed in

“Wiring Diagrams,” p. 27.

Normal Unit Shut Down

The unit can be stopped by opening the unit power supply

disconnect switch. Normally however, unit operation

stops due to interruption of the cooling demand signal by

the circuit cooling relays.The CCRC/CIRC condensing unit

should be shutdown by first shutting down the indoor

evaporative cooling unit. By stopping the indoor unit the

request for condensing has been terminated thus

stopping all condenser fans.The disconnect switch on the

CCRC/CIRC unit power supply should then be opened. Not

shutting down the evaporator unit before the condenser

unit will result in a high-pressure situation and should be

avoided if possible.

Seasonal Shut Down

If the unit will be inoperative for an extended period, lock

out unit operation by disconnecting the compressor

interlock circuits and opening and locking the main power

disconnect switch.

If desired, large amounts of liquid refrigerant can be

isolated and stored in the condenser by closing the liquid

line service valves and operating the compressors to

pump the refrigerant into the condenser and then valving

off the hot gas line near the condenser coil.

Seasonal Startup

1. Inspect the interior of the unit for debris.

2. Check control panel wiring connections for corrosion

and proper security. Check control panel door for

proper weather seal.

3. Inspect condenser fans. Blades must be secure on fan

shaft and rotate freely.

4. Inspect coil for obstructions and cleanliness. Clean coil

if required. Refer to “Maintenance”.

5. Inspect low ambient dampers. Damper blades must be

properly aligned, free from obstructions and operate

freely.You may have to disconnect actuator linkage to

inspect damper movement.

6. Close unit power supply disconnect switch.

7. Allow 24 hours of crankcase operation before starting

compressors. Crankcase heaters are energized

whenever the unit disconnect is closed and the

compressors are off.

The unit should now operate properly in response to

cooling demand at the system thermostat.

WARNING

Live Electrical Components!

During installation, testing, servicing and

troubleshooting of this product, it may be necessary to

work with live electrical components. Have a qualified

licensed electrician or other individual who has been

properly trained in handling live electrical components

perform these tasks. Failure to follow all electrical

safety precautions when exposed to live electrical

components could result in death or serious injury.

NOTICE:

Compressor Damage!

Never manually or automatically pump down system

below 7 psig.This will cause the compressor to operate

in a vacuum and result in compressor damage.

NOTICE:

Compressor Damage!

Keep crankcase heaters on whenever refrigerant is in

the system. If crankcase heaters have not been on with

refrigerant in the system, turn the crankcase heaters on

for a minimum of 24hours before starting compressors.

Failure to follow the above could result in compressor

failure or reduced compressor life.

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Trane Modular 20 to 35 Tons Manual de instalación Pagina 21

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