Carrier 23XL Specifiche Scaricare il pdf (Pagina 53)

Selecting Refrigerant Type — The 23XL control must

be conﬁgured for the refrigerant being used, either HCFC-22

or HFC-134a.

TO CONFIRM REFRIGERANT TYPE — Conﬁrm that the

correct refrigerant type is indicated by entering the Service

menu and selecting Control Test. See Fig. 21. Select Refrig-

erant Type. The screen will display the current refrigerant

setting. Press EXIT softkey to leave the screen without changes.

TO CHANGE REFRIGERANT TYPE — Enter the Service

menu and select Control Test. See Fig. 21. Select Refriger-

ant Type. The screen will display the current refrigerant set-

ting. Press the YES softkey to change the current setting.

Next, move to the Attach To Network Device menu and se-

lect ATTACH TO LOCAL DEVICE to upload the new re-

frigerant tables.

Input Service Conﬁgurations — The following con-

ﬁgurations require the LID screen to be in the Service por-

tion of the menu.

• password

• input time and date

• LID conﬁguration

• controller identiﬁcation

• service parameters

• equipment conﬁguration

• automated controls test

PASSWORD — When accessing the Service screens, a pass-

word must be entered. All LIDs are initially set for a pass-

word of 1-1-1-1. This password may be changed in the LID

conﬁguration screen, if desired. See Fig. 21.

INPUT TIME AND DATE — Access the Time and Date

menu on the Service menu. Input the present time of day,

date, and day of the week. ‘‘Holiday Today’’ should only be

conﬁgured to ‘‘Yes’’ if the present day is considered a one-

time holiday. This causes the chiller to start and stop as de-

picted by the holiday conﬁguration under the appropriate time

schedule screen.

CHANGE LID CONFIGURATION IF NECESSARY— The

LID Conﬁguration on the service menu is used to view or

modify the LID CCN address, change to English or SI units

and to change the password. If there is more than one ma-

chine at the jobsite, change the LID address on each ma-

chine so that each machine has its own address. Note and

record the new address. Change to SI units, as required, and

change the password, if desired.

MODIFY CONTROLLER IDENTIFICATION, IF NECES-

SARY — The controller identiﬁcation screen is used to change

the PSIO module address. Change this address for each ma-

chine if there is more than one machine at the job-

site. Write the new address on the PSIO module for future

reference.

Change the LID address if there is more than one machine

on the jobsite. Access the LID conﬁguration screen to view

or modify this address.

INPUT EQUIPMENT SERVICE PARAMETERS AS NEC-

ESSARY — The Equipment Service table has three service

tables: Service1, Service2, and Service3.

Conﬁgure Service1 Table —Access Service1 table to modify/

view the following to jobsite parameters:

Chilled Medium Water or Brine

Brine Refrigerant Trip Point Usually 3° F (1.7° C) below design

refrigerant temperature

Hot Gas Bypass Option Is HGBP installed?

Minimum Load Points (T1/P1) Per job data — See Modify Load

Points section

Maximum Load Points (T2/P2) Per job data — See Modify Load

Points section

Motor Rated Load Amps Per job data

Motor Rated Line Voltage Per job data

Motor Rated Line KW Per job data

Line Frequency 50 or 60 Hz (if optional kW

transducer installed)

Compressor Starter Type Reduced voltage or full voltage

NOTE: Other values are left at the default values. These may be changed by

the operator as required. Service2 and Service3 tables can be modiﬁed by the

owner/operator, as required.

Modify Minimum and Maximum Load Points (DT1/P1;

D T2/P2) —The pairs of machine load points, located on the

Service1 table, determine when to open the hot gas bypass

solenoid valve. The points should be set based on individual

machine operating conditions.

Close the ball valve, located next to the hot gas solenoid

valve, halfway. The purpose of the ball valve is to act as an

isolation valve and to control the amount of gas ﬂow by ad-

justing the ﬂow to accommodate different frame sizes and

jobsite conditions.

If, after setting the ball valve for these points, any addi-

tional adjustment should be changed by the operator.

Example of conﬁguration: Machine operating parameters

Estimated Minimum Load Conditions:

44 F (6.7 C) LCW

46.5 F (8.1 C) ECW

43 F (6.1 C) Suction Temperature

70 F (21.1 C) Condensing Temperature

Estimated Maximum Load Conditions:

44 F (6.7 C) LCW

54 F (12.2 C) ECW

42 F (5.6 C) Suction Temperature

98 F (36.7 C) Condensing Temperature

Calculate Maximum Load — To calculate maximum load

points, use design load condition data.

Maximum Load DT2:

54 - 44 = 10 F (12.2 - 6.7 = 5.5 C)

Maximum Load DP2:

(Factory Recommended Setting)

200 psi (1379 kPa)[125 psi (862 kPa)]

Calculate Minimum Load — To calculate minimum load con-

ditions, estimate the temperature difference that the cooler

will have at 25% load or lower, then estimate what the suc-

tion and condensing temperatures will be at this point.

Suction Temperature:

43 F (6.1 C) = 73 psig (503 kPa) saturated

refrigerant pressure

Condensing Temperature:

70 F (21.1 C) = 121 psig (834 kPa) saturated

refrigerant pressure

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 103 104

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Carrier 23XL Specifiche Pagina 53

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