Carrier AquaEdge 19MV, Руководство по запуску, эксплуатации и техническому обслуживанию

Страница: 40 / 68

40
Water Treatment
Untreated or improperly treated water may result in corrosion,
scaling, erosion, or algae. The services of a qualified water treat-
ment specialist should be obtained to develop and monitor a treat-
ment program.
Inspect the VFD
Before working on any starter, shut off the chiller, then open and
tag all disconnects supplying power to the starter.
Every 3-6 months inspect the air filter of the Danfoss VFD. To re-
move dirt the filter can be vacuumed or washed. If washed let the
filter dry completely before re-installing. If the dirt removed ap-
pears oily, replace filter.
Periodically vacuum accumulated debris on the internal parts. Use
electrical cleaner for electrical parts as required. Perform visual in-
spection of the capacitors located on the DC bus and inductors.
Check cooling fan operation. Check condensate drain for the VFD
enclosure.
Power connections on newly installed starters may relax and
loosen after a short period of operation. Turn power off and re-
tighten. Recheck annually thereafter.
Recalibrate Pressure Transducers
Once a year, the pressure transducers should be checked against a
pressure gage reading. Check all pressure transducers: evaporator
pressure, condenser pressure, refrigerant pump inlet pressure, re-
frigerant pump outlet pressure, bearing inlet pressure, bearing out-
let pressure, and optional evaporator entering and leaving water
pressure, as well as condenser entering and leaving water pressure.
See Fig. 32.
Recalibrate Temperature Thermistors
Recalibrate the temperature thermistors for entering chilled water
(ECW), leaving chilled water (LCW), entering condenser water
(ECDW), leaving condenser water (LCDW).
Ordering Replacement Chiller Parts
When ordering Carrier specified parts, the following information
must accompany an order:
• chiller model number and serial number
• name, quantity, and part number of the part required
• delivery address and method of shipment.
CAUTION
Water must be within design flow limits, clean, and treated to
ensure proper chiller performance and reduce the potential of
tube damage due to corrosion, scaling, erosion, and algae. Car-
rier assumes no responsibility for chiller damage resulting
from untreated or improperly treated water. If the unit is going
to be stored for an extended period of time, Carrier has specific
long-term storage requirements that are documented and avail-
able from the chiller sales group.
CAUTION
The motor leads must be disconnected from the VFD before
an insulation test is performed. The voltage generated from the
tester can damage the drive components.
CAUTION
Failure to follow these procedures may result in personal inju-
ry or damage to equipment.
TO AVOID an electric shock hazard, verify that the voltage on
the bus capacitors has discharged completely before servicing.
Check the DC bus voltage at the power terminal block by
measuring between the +DC and –DC terminals, between the
+DC terminal and the chassis, and between the –DC terminal
and the chassis. The voltage must be zero for all three
measurements.
WARNING
DC bus capacitors retain hazardous voltages after input power
has been disconnected. An isolated multimeter will be needed
to measure DC bus voltage and to make resistance checks.
After disconnecting input power, wait 5 minutes for the DC
bus capacitors to discharge and then check the voltage with a
voltmeter rated for the DC bus voltage to ensure the DC bus
capacitors are discharged before touching any internal compo-
nents. Failure to observe this precaution could result in severe
bodily injury or loss of life.
WARNING
The disconnect on the starter front panel does not always de-
energize all internal circuits. Open all internal and remote
disconnects before servicing the starter. Failure to follow this
procedure may result in personal injury by electric shock.
CAUTION
Loose power connections can cause voltage spikes, overheat-
ing, malfunctioning, or failures.