Carrier Charge Refrigerant into Chiller, 19XL Chiller Equalization Without PUMP- OUT Unit

Loosen the compressor holddown bolts to allow free spring travel. Open the compressor suction and discharge service valves. Check that oil is visible in the compressor sight glass. Add oil if necessary.

See Pumpout and Refrigerant Transfer Procedures and Optional Pumpout System Maintenance sections, pages 59 and 65, for details on transfer of refrigerant, oil speci®ca- tions, etc.

High Altitude Locations Ð Recalibration of the pres- sure transducers will be necessary as the chiller was initially calibrated at sea level. Please see the calibration procedure in the Troubleshooting Guide section.

Charge Refrigerant into Chiller

The transfer, addition, or removal of refrigerant in spring isolated chillers may place severe stress on external pip- ing if springs have not been blocked in both up and down directions.

The standard 19XL chiller will have the refrigerant already charged in the vessels. The 19XL may be ordered with a nitrogen holding charge of 15 psig (103 kPa). Evacu- ate the entire chiller, and charge chiller from refrigerant cylinders.

19XL CHILLER EQUALIZATION WITHOUT PUMP- OUT UNIT

When equalizing refrigerant pressure on the 19XL chiller after service work or during the initial chiller start-up, do not use the discharge isolation valve to equalize. The motor cooling isolation valve or charging hose (con- nected between pumpout valves on top of cooler and condenser) is to be used as the equalization valve.

To equalize the pressure differential on a refrigerant isolated 19XL chiller, use the TERMINATE LOCKOUT function of the Control Test in the SERVICE menu. This will help to turn on pumps and advise the proper procedure. The following procedure describes how to equalize refrig- erant pressure on an isolated 19XL chiller without a pump- out unit:

1.Access TERMINATE LOCKOUT function on the Con- trol Test.

2.Turn on the chilled water and condenser water pumps to ensure against freezing.

3.Slowly open the refrigerant cooling isolation valve. The chiller cooler and condenser pressures will grad- ually equalize. This process will take approximately 15 minutes.

4.Once the pressures have equalized, the cooler isolation valve, the condenser isolation valve, and the hot gas by- pass isolation valve may now be opened. Refer to Fig. 27 and 28, valves 11, 12, and 14.

Whenever turning the discharge isolation valve, be sure to reattach the valve locking device. This will prevent the valve from opening or closing during serv- ice work or during chiller operation.

Table 7 Ð Control Test Menu Functions

TESTS TO BE	DEVICES TESTED
PERFORMED

1.Automated Tests* Operates the second through seventh tests

2. PSIO Thermistors	Entering chilled water
	Leaving chilled water
	Entering condenser water
	Leaving condenser water
	Discharge temperature
	Bearing temperature
	Motor winding temperature
	Oil sump temperature

3.Options Thermistors Common chilled water supply

sensor

Common chilled water return sensor Remote reset sensor Temperature sensor Ð Spare 1

Spare 2

Spare 3

Spare 4

Spare 5

Spare 6

Spare 7

Spare 8

Spare 9

4. Transducers	Evaporator pressure
	Condenser pressure
	Oil pressure differential
	Oil pump pressure

5.Guide Vane Actuator Open Close

6. Pumps	All pumps or individual pumps may
	be activated:
	Oil pump Ð Con®rm pressure
	Chilled water pump Ð Con®rm ¯ow
	Condenser water pump Ð Con®rm
	¯ow

7.Discrete Outputs All outputs or individual outputs may be energized:

Hot gas bypass relay Oil heater relay Motor cooling relay Tower fan relay Alarm relay

Shunt trip relay

8.Pumpdown/Lockout When using pumpdown/lockout, observe freeze up precautions when removing charge:

Instructs operator as to which valves to close and when

Starts chilled water and condenser water pumps and con®rms ¯ows

Monitors Ð Evaporator pressure Condenser pressure Evaporator temperature during pumpout procedures

Turns pumps off after pumpdown Locks out compressor

9.Terminate Lockout Starts pumps and monitors ¯ows

Instructs operator as to which values to open and when

Monitors Ð Evaporator pressure Condenser pressure Evaporator temperature during charging process

Terminates compressor lockout

10.Refrigerant Type Sets refrigerant type used: HCFC-22 or HFC-134a.

NOTE: Be sure to ATTACH TO LOCAL DEVICE after changing refrigerant type.

See Attach to Network Device Control section, page 37.

*During any of the tests that are not automated, an out-of-range read- ing will have an asterisk (*) next to the reading and a message will be displayed.

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