Carrier 23XL Specifiche Scaricare il pdf (Pagina 54)

Minimum Load DT1:

46.5 −44 = 2.5 F (8.1 −6.7 = 1.4 C)

Minimum Load DP1:

121 − 73 = 45 psid (834 - 503 = 331 kPad)

To avoid unnecessary opening of the hot gas bypass valve,

add 5 psi (35 kPa) at DP1 from these conditions:

DT1 = 2.5 F (1.4 C)

DP1 = 50 psid (345 kPad) [30 psid (207 kPad)]

If opening of the hot gas bypass valve occurs too soon or too

late for the present conditions these parameters should be

changed by the operator. Only the minimum load points change

is required.

Energizing the hot gas bypass solenoid valve with the ball

valve fully open and the cold condenser water at a very low

temperature will result in the equalization of evaporator and

condenser pressure. This will result in a ‘‘Low Oil Pressure’’

alarm. See the Lubrication Cycle section on page 7.

MODIFY EQUIPMENT CONFIGURATION AS NECES-

SARY — The Equipment Conﬁguration table has tables to

select and view or modify. Carrier’s certiﬁed drawings will

have the conﬁguration values required for the jobsite. Modify

these tables only if requested.

Conﬁg Table Modiﬁcations — Change the values in this table

per job data. See certiﬁed drawings for values. Modiﬁca-

tions include:

• chilled water reset

• entering chilled water control (Enable/Disable)

• 4-20 mA demand limit

• auto restart option (Enable/Disable)

• remote contact option (Enable/Disable)

Owner-Modiﬁed CCN Tables — The following tables are de-

scribed for reference only.

Occdefcs Table Modiﬁcations — The Occdefcs tables con-

tain the Local and CCN time schedules, which can be modi-

ﬁed here, or in the Schedule menu selection as described

previously.

Holidef Table Modiﬁcations — The Holidef tables conﬁgure

the days of the year that holidays are in effect. See the holi-

day paragraphs in the Controls section for more

details.

Brodefs Table Modiﬁcations — The Brodefs screen deﬁnes

the outside air temperature sensor and humidity sensor (if

installed). It will deﬁne the start and end of daylight savings

time. Enter the dates for the start and end of daylight savings

if required for the location. Brodefs also will activate the

Broadcast function which enables the holiday periods that

are deﬁned on the LID.

Other Tables — The Alarmdef, Cons-def, and Runt-def con-

tain tables for use with a CCN system. See the applicable

CCN manual for more information on these tables.

These tables can only be deﬁned through a CCN Building

Supervisor.

CHECK VOLTAGE SUPPLY — Access the Status01 table

and read the actual line voltage. This reading should be equal

to the incoming power to the starter. Use a voltmeter to check

incoming power at the starter power leads. If the readings

are not equal, an adjustment can be made to the 24-v input

to the SMM at a potentiometer located in the low voltage

section to equalize the two readings.

PERFORM AN AUTOMATED CONTROL TEST — Check

the safety controls status by performing an automated con-

trol test. Access the Control Test table and select the

Automated Tests function (Table 8).

The automated control test will check all outputs and in-

puts for function. It will also set the refrigerant type. The

compressor must be in the OFF mode in order to operate the

controls test and the 24-v input to the SMM must be in range

(per line voltage percent on Status01 table). The OFF mode

is caused by pressing the STOP pushbutton on the LID lo-

cated on the left side of the four softkeys). Each test will ask

the operator to conﬁrm that the operation is occurring, and

whether or not to continue. If an error occurs, the operator

has the choice to try to address the problem as the test is

being run or to note the problem and proceed to the next

test.

When the test is ﬁnished, or the EXIT

softkey is pressed,

the test will be stopped and the Control Test table will be

displayed. If a speciﬁc automated test procedure is not com-

pleted, access that particular controls test to test the function

when ready. The Control Test table is described as

follows:

Automated Tests As described above, a complete

controls test.

PSIO Thermistors Check of all PSIO

thermistors only.

Option Module

Thermistors

Check of all option

module thermistors.

Transducers Check of all transducers.

Slide Valve Check of the slide valve

operation.

Pumps Check operation of pump outputs,

either all pumps can be

activated, or individual pumps

can be activated.

The test will also test

the associated input such as

ﬂow or pressure.

Discrete Outputs Activation of all on/off

outputs or individual on/off outputs.

Pumpdown Pumpdown prevents the low

refrigerant alarm during

evacuation so refrigerant

can be removed from the unit.

Pumpdown also locks the

compressor off and

starts the water pumps.

Terminate Lockout Charges refrigerant and enables

the chiller to run after pumpdown

lockout.

Refrigerant Type* Sets type of refrigerant used:

HCFC-22 or HFC-134a.

*Make sure to Attach to Local Device after changing refrigerant type.

Refer to Selecting Refrigerant Type section on page 53.

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