Carrier XRV Spécifications télécharger pdf (Page 88)

Water Treatment — Untreated or improperly treated

water may result in corrosion, scaling, erosion, or algae. The

services of a qualified water treatment specialist should be

obtained to develop and monitor a treatment program.

Inspect the VFD

Periodically vacuum or blow off accumulated debris on in-

ternal VFD enclosure components with a high-velocity, low-

pressure blower.

Power connections on newly installed VFDs may relax

and loosen after a month of operation. Turn power off and

retighten. Recheck annually thereafter.

Recalibrate Pressure Transducers —

Once a year,

the pressure transducers should be checked against a pressure

gage reading. Check all eight transducers: the 2 oil differential

pressure transducers, the condenser pressure transducer, the

cooler pressure transducer, the diffuser pressure transducer (on-

ly for compressors equipped with split ring diffusers), and the

optional waterside pressure transducer pairs (consisting of 4

flow devices: 2 cooler, 2 condenser).

Note the evaporator and condenser pressure readings on the

HEAT_EX screen on the ICVC (EVAPORATOR PRESSURE

and CONDENSER PRESSURE). Attach an accurate set of

refrigeration gages to the cooler and condenser Schrader

fittings. Compare the two readings. If there is a difference in

readings, the transducer can be calibrated as described in the

Troubleshooting Guide section. Oil differential pressure (OIL

PUMP DELTA P on the COMPRESS screen) should be zero

whenever the compressor is off.

Optional Pumpout System Maintenance — For

pumpout unit compressor maintenance details, refer to the

19XR Positive Pressure Storage System Installation, Start-Up,

and Service Instructions.

OPTIONAL PUMPOUT COMPRESSOR OIL

CHARGE — Use oil conforming to Carrier specifications

for reciprocating compressor usage. Oil requirements are as

follows:

ISO Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 or 220

Carrier Part Number. . . . . . . . . . . . PP23BZ103 or PP23BZ104

The total oil charge is 13 oz. (0.5 L)

Oil should be visible in the pumpout compressor sight glass

both during operation and at shutdown. Always check the oil

level before operating the pumpout compressor. Before adding

changing oil, relieve the refrigerant pressure through the access

valves.

Relieve refrigerant pressure and add oil to the pumpout unit

as follows:

1. Close service valves 2 and 4.

2. Run the pumpout compressor in Automatic mode for one

minute or until the vacuum switch is satisfied and com-

pressor shuts off.

3. Move the pumpout selector switch to OFF. Pumpout

compressor shell should now be under vacuum.

4. Oil can be added to the shell with a hand oil pump

through the access valve in the compressor base.

NOTE: The compressor access valve has a self-sealing fitting

which will require a hose connection with a depressor to open.

OPTIONAL PUMPOUT SAFETY CONTROL SETTINGS

(Fig. 47) — The optional pumpout system high-pressure

switch opens at 185 psig (1276 kPa) and closes at 140 psig

(965 kPa). Check the switch setting by operating the pumpout

compressor and slowly throttling the pumpout condenser

water.

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 poten-

tial of tube damage due to corrosion, scaling, erosion, and

algae. Carrier assumes no responsibility for chiller damage

resulting from untreated or improperly treated water.

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 VFD or drive

components.

WARNING

Before working on any VFD, shut off the chiller, open and

tag all disconnects supplying power to the VFD. After dis-

connecting input power to a VFD and before touching any

internal components, wait five minutes for the DC bus

capacitors to discharge, then check the voltage with a volt-

meter. Failure to observe this precaution could result in

sever bodily injury or death.

WARNING

The disconnect on the VFD front panel does not deenergize

all internal circuits. Open all internal and remote discon-

nects before servicing the VFD.

WARNING

Never open isolating knife switches while equipment is

operating. Electrical arcing can cause serious injury.

CAUTION

Loose power connections can cause voltage spikes, over-

heating, malfunctioning, or failures.

CONTACTOR

TERMINAL

STRIP

FUSES

TRANSFORMER

SWITCH

Fig. 47 — Pumpout Control Box (Interior)

a19-1569

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Carrier XRV Spécifications Page 88

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