Carrier HS070-160 Manuel d'utilisateur télécharger pdf (Page 14)

LEAVING WATER

SUCTION

,----CONNECTION

(T58T6)

INLET

COOLER TUBE

CONNECTION

THERMISTOR..

ENTERING COOLER

WATER SENSOR

(T21

Fig. 4

Cooler Sensor Locations

Bau’

The~~isfor

Thermistors mis-located or out of

calibration.

Code 68 and 69, Low Suction Superheat

~‘--

if the follow-

ing logic is satisfied, then all the compressors on the

circuit will be stopped.

Suction superheat is equal to 0°F

(OOC)

or the satu-

rated suction is greater than 58 F (14.4 C) and either

condition has been true for more than 5 minutes.

Possible causes for this failure are a stuck electronic

expansion valve or thermistors mis-located or out of

calibration.

To reset, use the manual reset method.

Code 71 to 81, Thermistor Failure

~~~

If the measured

temperature of a thermistor is less than -60 F (-51 C)

(363,000 ohms) or greater than 240 F (116 C) (2 16 ohms),

the appropriate sensor error code will be displayed and

the unit will be stopped. The thermistor failures will

automatically reset. The following is a summary of

possible causes.

Thermistor Failure

A shorted or open circuit ther-

mistor will cause the failure.

Wiving Failure

A shorted or open circuit will cause

the failure.

P~oc~essnr

Module

Fczilure

If the circuitry in the pro-

cessor module fails, the error could occur.

NOTE: The reset thermistor is an optional thermistor

and is only used with outside or space temperature reset.

It will only be read by the processor if the unit is con-

figured for outside or space temperature reset.

The absence of a thermistor failure does not necessarily

mean that a thermistor is accurate. To determine

accuracy, the reading must be compared with a measure-

ment of the actual temperature to which the thermistor

probe is exposed.

Quick Test

The Quick Test feature allows the service

technician to individually test all the inputs and outputs

of the control system.

The test function operates the Quick Test diagnostic

program. When the unit is in STANDBY mode, the test

subfunctions will energize the solenoid valves, unloaders,

electronic expansion valves and compressors. The

solenoids and unloaders will energize for 3 minutes. The

electronic expansion valve will travel to fully open in one

test and to fully closed in the next. The compressors will

energize for 10 seconds. The subfunctions are explained

below. Refer to Table 6 for all the elements in the

subfunctions.

NOTE: The Quick Test energizes the alarm light and

alarm relay. They will remain energized as long as the unit

is in Quick Test.

To reach a particular test, enter its subfunction number

and then scroll to the desired test with the

key. A

test can be terminated by pressing

. Pressing

after a test has started will advance the system to the

next test, whether the current one is operating or has

timed out. Once in the next step, you may start the test

by pressing

ENm

or advance past it by pressing

cl cl

While the unit is in Quick Test, you may access another

display or function by depressing the appropriate keys;

however, the unit will remain in the Quick Test func-

tion until

T;;i

is entered, or, if the keyboard is

not used for 10 minutes, the unit will automatically leave

the Quick Test function. See the following example:

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 27 28

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Carrier HS070-160 Manuel d'utilisateur Page 14

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