Carrier 23XL Specifiche Scaricare il pdf (Pagina 57)

If rotation is proper , allow the compressor to come up to

speed.

NOTE: Starters may have phase protection and will not al-

low a start if the phase is not correct. Instead, a ‘‘STARTER

FAULT’’ message will occur if this happens.

NOTES ON SOLID-STATE STARTERS

1. When the compressor is energized to start by the 1CR

relay, conﬁrm that the ‘‘Relay On LED’’is lit on the starter

SCR control board. The compressor motor should start to

turn immediately when this light comes on. If not, adjust

the start torque potentiometer in a clockwise direction.

2. Observe that all 6-gate LEDs are lit on the starter SCR

control board.

3. The factory setting should bring the motor to full

voltage in 3 to 5 seconds on Wye delta starters or 8 to 10

seconds on solid-state starters. If the setting is not cor-

rect, adjust the ramp potentiometer counterclockwise for

a shorter time, clockwise for a longer time.

Check Oil Pressure and Compressor Stop

1. Two minutes after start-up, note the oil pressure reading

on the LID default screen. The value is equal to the dif-

ference between the oil and evaporator pressure trans-

ducer readings. The minimum oil pressure is 20-40 psi

(138-276 kPa) [7-40 psi (48-276 kPa)]. The oil and evapo-

rator pressure transducer readings can be observed on the

Status01 table. A normal full load reading is approxi-

mately 120 psi (827 kPa) [78 psi (538 kPa)].

2. Press the STOP softkey and listen for any unusual sounds

from the compressor as it coasts to a stop.

Calibrate Motor Current Demand Setting

NOTE: Entering condenser water temperature must equal de-

sign for compressor to meet 100% RLA at designs tons.

1. Make sure that the compressor motor rated load amps in

the Service1 table has been conﬁgured. Place an ammeter

on the line that passes through the motor load current trans-

former on the motor side of the power factor correction

capacitors (if provided).

2. Set the chilled water set point to the desired value.

Highlight the appropriate chilled water set point on

the set point screen then press SELECT

. Press

INCREASE

or DECREASE to bring the value top

desired value. Press ENTER

when equal.

3. Start the compressor and establish a steady motor current

by overriding the Active Demand Limit on the

Status01 table. Highlight this point, then press

SELECT

. Press INCREASE or DECREASE to

bring the value between 70% and 100% RLA. Press

ENTER

when ﬁnished.

4. Compare the compressor motor amps value on the

Status01 table to the actual amps shown on the ammeter

on the starter. Adjust the amps value on the LID to the

actual value seen at the starter if there is a difference. High-

light the amps value then press SELECT

. Press

INCREASE

or DECREASE to bring the value to that

indicated on the ammeter. Press ENTER

when equal.

The adjustments should not be performed in intervals of

more than 10 amps.

5. Gradually increase the Active Demand Limit and repeat

Step 4.

6. When calibration is complete, make sure that the Active

Demand Limit is released to PIC control.

To Prevent Accidental Start-Up — The PIC can be

set up so that start-up of the unit is more difficult than just

pressing the LOCAL

or CCN softkeys during machine

service or when necessary. By accessing the Status01

table, and highlighting the chiller Start/Stop line, the value

can be overridden to stop by pressing SELECT

and then

the STOP

and ENTER softkeys. ‘‘SUPVSR’’ will ap-

pear after the value. When attempting to restart, remember

to release the override. The default machine message line

will also state that the Start/Stop has been set to ‘‘Start’’ or

‘‘Stop’’ when the value is overridden.

Check Machine Operating Conditions — Check

to be sure that machine temperatures, pressures, water flows,

and oil and refrigerant levels indicate that the system is func-

tioning properly.

Instruct the Operator — Check to be sure that the op-

erator(s) understands all operating and maintenance proce-

dures. Point out the various machine parts and explain their

function as part of the complete system.

COOLER-CONDENSER — Float valve, relief devices, re-

frigerant charging valve, temperature sensor locations, pres-

sure transducer locations, Schrader ﬁttings, waterboxes and

tubes, and vents and drains.

OPTIONAL STORAGE TANK AND PUMPOUT SYS-

TEM — Transfer valves and pumpout system, refrigerant

charging and pumpdown procedure, and relief devices.

MOTOR COMPRESSOR ASSEMBLY — Slide valve

assembly, motor cooling system, temperature and pressure

sensors, motor temperature sensors, and compressor

serviceability.

MOTOR COMPRESSOR LUBRICATION SYSTEM — Oil

heater (Frame 1 and 2 machines), oil charge and speciﬁca-

tion, synthetic oil, operating and shutdown oil level, tem-

perature and pressure, and oil charging connections.

COMPRESSOR LUBRICATION SYSTEM — Oil sight glass,

operating and shutdown oil level, temperature and pressure

transducers, isolatable oil ﬁlter assembly, oil charging and

drain connections, rotor inlet sensors, discharge pressure trans-

ducer, and oil charge and speciﬁcations.

OIL SEPARATION SYSTEM — Oil sight glasses, sensors,

muffler, and oil level switch (Frame 4 machines only).

CONTROL SYSTEM — CCN and Local start, reset, menu,

softkey functions, LID operation, occupancy schedule, set

points, safety controls, and auxiliary and optional controls.

AUXILIARY EQUIPMENT — Starters and disconnects, sepa-

rate electrical sources, pumps, and cooling tower.

DESCRIBE MACHINE CYCLES — Refrigerant, motor cool-

ing, lubrication, and oil reclaim.

REVIEW MAINTENANCE — Scheduled, routine, and ex-

tended shutdowns, importance of a log sheet, importance of

water treatment and tube cleaning, and importance of main-

taining a leak-free machine.

SAFETY DEVICES AND PROCEDURES — Electrical dis-

connects, relief device inspection, and handling refrigerant.

CHECK OPERATOR KNOWLEDGE — Start, stop, and shut-

down procedures, safety and operating controls, refrigerant

and oil charging, and job safety.

REVIEW THE START-UP, OPERATION, AND MAINTE-

NANCE MANUAL.

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