Engineered air EngA CU Series, Инструкция по установке, эксплуатации и обслуживанию

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A
CU MANUAL
IOM-14 30 of 46 Feb 06 R4
6. Check drive alignment and belt tension. Refer to Maintenance, page 36.
7.
Ensure that refrigerant lines and control capillary lines do not rub against cabinet or other lines.
8.
Inspect all electrical wiring, both field and factory installed, for loose connections. Ensure fire alarm
contact is installed, or jumpered if not required.
9.
Turn disconnect switch ON (control switch is still off) and check the supply voltage. Voltage must be
within 10% of rating plate. If not, contact the installing electrical contractor and have the voltage
condition corrected before continuing start-up.
10.
Crankcase heaters must be energized for at least twenty-four hours prior to starting the
compressors. Check to see if heaters are working.
11.
Attach service gauges. Some units are equipped with optional service valves at various locations.
Ensure all service valves and post valves are back seated (fully open).
12.
Rotation check.
Check rotation of all 3 phase motors. Motors were checked for correct rotation at the factory, if
rotation is incorrect, turn off disconnect switch and reverse any two power leads leaving the
disconnect. Re-check rotation.
Caution:
Screw and Scroll compressors MUST be checked for proper rotation at startup.
Permanent damage can occur if rotation is not correct.
Scroll compressors running backwards will typically have low head pressure, high suction pressure
and are usually noisy. Screw compressors MUST be checked with a phase meter before starting. If
rotation is incorrect, instantaneous permanent damage can occur.
Reciprocating and Turbocor centrifugal compressors do not require rotational checks.
13.
At all times of the year units equipped with water cooled condensers are shipped with a glycol
solution in the condenser to prevent freeze damage during shipping. Depending on the application,
the condensers may have to be flushed prior to use. Dispose of the glycol as required by local
authorities having jurisdiction. Turn on the water supply and fill the condenser. Check for water
leaks.
14.
Turn on the service switch. Set controls to call for cooling. The supply fan will start as described in
the unit function. The compressors should now be ready to start. Condenser fans will start as
required when compressors are operating. If the compressor is equipped with an oil level sight
glass, check the oil level.
15.
Check the amperage draw of each motor and compressor. Refer to unit or motor rating plate for
full load amps. At the unit, check and record the voltage while it is running. For 3 phase power the