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Hermetic Absorption Liquid Chillers

MACHINE OPERATION

MACHINE START-STOP SYSTEMS

General - The exact start-stop system for a given

machine is established by the customer. Systems

can vary from one installation to another. These

systems and procedures are meant for general

guidelines only.

The three most common types of systems are

given below. Review these systems and decide

which applies to your machine. Then follow the

start-stop procedure given.

NOTE: If machine has been shut down for more

than 2 days, follow procedures under Start-Up

After Limited Shutdown or Start-Up After

Extended Shutdown. In all cases below, when

machine starts, the white run light will en

ergize. When the machine stops, the light will

go out after automatic dilution.

Automatic Start-Stop System - Starting and stop

ping with this system is accomplished by an

automatic controller such as a thermostat or

time clock, etc. Also, an AUTO-MANUAL switch

is provided so the machine can be started by-

pressing machine START button with switch in

MANUAL position. All auxiliary equipment is

tied in with the machine control circuit and will

start when the machine starts. If automatic time

delay relays are provided, the machine will start

after a preselected time interval.

The operating engineer must make periodic

checks to ensure that the machine with auxiliary

equipment is operating satisfactorily.

PROCEDURES

1. Place AUTO-MANUAL switch in the AUTOpo-

sition for the machine to start or stop automat

ically. The automatic controller determines

when the machine starts or stops.

2. To start fully automatic machines after limited

or extended shutdown place the AUTO-MANUAL

switch in MANUAL and press the START

button. Then follow start-up procedures for

limited or extended shutdown. Only after man

ual start has been completed should the AUTO

MANUAL switch be placed in AUTO.

NOTE: When the machine shuts down either

automatically or manually, the refrigerant

and solution pumps will continue to run

until automatic dilution is completed.

Semiautomatic Start-Stop System - All auxiliary

equipment used with this system is tied directly

to the control circuit. It is necessary for the

operating engineer to press the START button

to start the condensing water pump, chilled water

pump, machine pumps, and cooling tower fan

(if used).

PROCEDURES

1. Press STOP button to stop machine.

START button to start machine.

Press

NOTE: On shutdown the machine pumps will

continue to run until automatic dilution

is completed.

Semiautomatic Start-Stop System with Manual

Auxiliaries - All auxiliaries must be started

manually.

PROCEDURES

1. Start chilled water pump.

2. Start condensing water pump.

3. Start cooling tower fan (if used). (This depends

on outside temperature.)

4. Press START button to start machine.

5. To stop machine, press STOP button. Then

stop the following:

a. Cooling tower fan (if used).

b. Condenser water pump.

c. Chilled water pump.

NOTE: The refrigerant and solution

pumps will continue to run until auto

matic dilution is completed.

MACHINE START-UP PROCEDURES

General - Procedures for start-up differ depend

ing on how long the machine has been shut down.

There are two start-up procedures: Start-up

after limited shutdown (3 days to 3 weeks), and

start-up after extended shutdown (over 3 weeks).

Start-Up After Limited Shutdown

PROCEDURES

1. Start the machine as outlined for your system

under Machine Start-Stop Systems.

2. Check the leaving chilled water temperature.

If temperature drops to design, then steps 3

and 4 are not necessary. If the temperature

does not drop to design, noncondensables are

probably present in the machine. Proceed

with steps 3 and 4.

3. Determine the amount of noncondensables by

taking an absorber loss reading (the temper

ature difference between the refrigerant and

solution vapor). To determine absorber loss,

refer to Carrier Standard Service Techniques,

publication SM-16. A machine with absorber

loss of less than 6 F can normally be started

without the machine solution becoming solid

ified. If absorber loss is greater than 6 F,

auxiliary evacuation is recommended. A ma

chine fully evacuated will normally have an

absorber loss of 2 F or less. Instructions

for auxiliary evacuation are in Carrier Stand

ard Service Techniques, publication SM-16.

Carrier Corporation 1968 Printed in U.S.A.

1-68

16JA-1SO

1 2 3 4 5 6 ... 11 12

Résumé du contenu

Page 1 - MACHINE OPERATION

tiCarrierHermetic Absorption Liquid ChillersMACHINE OPERATIONMACHINE START-STOP SYSTEMSGeneral - The exact start-stop system for a given machi

Page 2

GENERAL INFORMATIONEQUILIBRIUM DIAGRAMThe Equilibrium Diagram (Fig. 5) is used to determine solution concentration in your machine. It is

Page 3 - MAINTENANCE

VAPOR PRESSURE IN INCHES OF MERCURY ABSOLUTE® fv> cr wro ts> UJ OJ ^ Ol cno Ü» o o> o o o“n<p*inmSiE.5"c*3Q(Q23SATURATION

Page 4

16JA ABSORPTION CYCLEFigure 6 illustrates the basic absorption flow diagram. The evaporator-absorber section operates at an absolute pr

Page 5 - EVERY 5 YEARS

To prevent solidification while purging:a. Place reclaim switch to MANUAL.b. Throttle back steam control valve.(1) Electronic Control - Turn th

Page 6 - 2 - F-8 Frame Pumps

STORAGE CHAMBER SUPPLY LINECONDENSER PURGE SUCTION LINEPURGE EXHAUST VALVEINSTRUCTION STICKER PURGESEPARATIONCHAMBERPURGE RETURN VALVETO GENERATOR OV

Page 7 - J."

Check Machine Tightness - The most important maintenance item on the absorption machine is maintaining vacuum tightness within accepta

Page 8 - TROUBLESHOOTING GUIDE

EVERY 2 YEARSReplace Service Valve Diaphragms - Requirement to replace valve diaphragms is determined by valve usage or number of ma

Page 9 - TROUBLESHOOTING GUIDE (CONT)

note: item numbers are referenced inDISASSEMBLY AND REASSEMBLY PROCEDURES.Fig. 2 - F-8 Frame PumpsNOTE: ITEM NUMBERS ARE REFERENCED IN DISASSEMBLY AND

Page 10 - GENERAL INFORMATION

J."16MAXREASSEMBLY PROCEDURES and 3.Refer to Fig. 21. Clean all parts.2. Replace wearing rings. Use hand pressure to position new rings.3.

Page 11 - ® fv> cr w

TROUBLESHOOTING GUIDESYMPTOM OR DIFFICULTYPOSSIBLE CAUSEREMEDYA. Lithium bromide solidifies at start-up.1. Condenser water too cold. 1. a. Reset cooli

Page 12 - 16JA ABSORPTION CYCLE

TROUBLESHOOTING GUIDE (CONT)SYMPTOM OR DIFFICULTYPOSSIBLE CAUSEREMEDYD. Machine shuts down on safety control.1. Motor overloads.1. Reset all motor

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Carrier 16JA Manuel d'utilisateur

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