Table 93 — Time Clock Configuration

ITEM

EXPANSION

 

RANGE

POINT

DEFAULT

TIME

TIME OF DAY

 

 

 

 

HH.MM

Hour and Minute

00:00

TIME

 

DATE

MONTH,DATE,DAY AND YEAR

 

 

 

 

MNTH

Month of Year

multi-text strings

MOY

 

DOM

Day of Month

0-31

DOM

 

DAY

Day of Week

multi-text strings

DOWDISP

 

YEAR

Year

e.g. 2003

YOCDISP

 

SCH.L

LOCAL TIME SCHEDULE

 

 

 

 

PER.1

PERIOD 1

 

 

 

 

PER.1DAYS

DAY FLAGS FOR PERIOD 1

 

 

 

Period 1 only

PER.1DAYSMON

Monday in Period

YES/NO

PER1MON

Yes

PER.1DAYSTUE

Tuesday in Period

YES/NO

PER1TUE

Yes

PER.1DAYSWED

Wednesday in Period

YES/NO

PER1WED

Yes

PER.1DAYSTHU

Thursday in Period

YES/NO

PER1THU

Yes

PER.1DAYSFRI

Friday in Period

YES/NO

PER1FRI

Yes

PER.1DAYSSAT

Saturday in Period

YES/NO

PER1SAT

Yes

PER.1DAYSSUN

Sunday in Period

YES/NO

PER1SUN

Yes

PER.1DAYSHOL

Holiday in Period

YES/NO

PER1HOL

Yes

PER.1OCC

Occupied from

00:00

PER1_OCC

00:00

PER.1UNC

Occupied to

00:00

PER1_UNC

24:00

Repeat for periods 2-8

 

 

 

 

 

HOL.L

LOCAL HOLIDAY SCHEDULES

 

 

 

 

HD.01

HOLIDAY SCHEDULE 01

 

 

 

 

HD.01MON

Holiday Start Month

0-12

HOL_MON1

 

HD.01DAY

Start Day

0-31

HOL_DAY1

 

HD.01LEN

Duration (Days)

0-99

HOL_LEN1

 

Repeat for holidays 2-30

 

 

 

 

 

DAY.S

DAYLIGHT SAVINGS TIME

 

 

 

 

DS.ST

DAYLIGHT SAVINGS START

 

 

 

 

DS.STST.MN

Month

1

- 12

STARTM

4

DS.STST.WK

Week

1

- 5

STARTW

1

DS.STST.DY

Day

1

- 7

STARTD

7

DS.STMIN.A

Minutes to Add

0

- 90

MINADD

60

DS.SP

DAYLIGHTS SAVINGS STOP

 

 

 

 

DS.SPSP.MN

Month

1

- 12

STOPM

10

DS.SPSP.WK

Week

1

- 5

STOPW

5

DS.SPSP.DY

Day

1

- 7

STOPD

7

DS.SPMIN.S

Minutes to Subtract

0

- 90

MINSUB

60

TROUBLESHOOTING

The scrolling marquee display shows the actual operating conditions of the unit while it is running. If there are alarms or there have been alarms, they will be displayed in either the cur- rent alarm list or the history alarm list. The Service Test mode allows proper operation of the compressors, fans, and other components to be checked while the unit is not operating.

Complete Unit Stoppage — There are several condi- tions that can cause the unit not to provide heating or cooling. If an alarm is active which causes the unit to shut down, diagnose the problem using the information provided in the Alarms and Alerts section on page 93, but also check for the following:

Cooling and heating loads are satisfied.

Programmed schedule.

General power failure.

Tripped control circuit transformers circuit breakers.

Tripped compressor circuit breakers.

Unit is turned off through the CCN network.

Single Circuit Stoppage — If a single circuit stops incorrectly, there are several possible causes. The problem should be investigated using information from the Alarms and Alerts section on page 93.

Service Analysis — Detailed service analysis can be found in Tables 94-96 and in Fig. 14.

Restart Procedure — Before attempting to restart the machine, check the alarm list to determine the cause of the shutdown. If the shutdown alarm for a particular circuit has occurred, determine and correct the cause before allowing the unit to run under its own control again. When there is problem, the unit should be diagnosed in Service Test mode. The alarms must be reset before the circuit can operate in either Normal mode or Service Test mode.

Thermistor Troubleshooting — The electronic con- trol uses five 5K-thermistors for the saturated condensing temperature on 48/50AJ,AK,AW,AY units (SCT.A and SCT.B). See Tables 97 and 98 for temperature vs. resistance data.

When replacing thermistors SCT.A and SCT.B, reuse the original hardware. These thermistors must be clamped tightly to the hairpins of the condenser.

The EDT, OAT, RAT, LAT, T55, T56, and T58 space tem- perature sensors use 10K thermistors. Resistances at various temperatures are listed in Tables 99 and 100.

THERMISTOR/TEMPERATURE SENSOR CHECK — A high quality digital volt-ohmmeter is required to perform this check.

1.Connect the digital voltmeter across the appropriate thermistor terminals at the J8 terminal strip on the main base board.

2.Using the voltage reading obtained, read the sensor tem- perature from Tables 97-100.

3.To check thermistor accuracy, measure temperature at probe location with an accurate thermocouple-type temperature-measuring instrument. Insulate thermocou- ple to avoid ambient temperatures from influencing reading. Temperature measured by thermocouple and temperature determined from thermistor voltage reading should be close, 5° F (3° C) if care was taken in applying thermocouple and taking readings.

If a more accurate check is required, unit must be shut down and thermistor removed and checked at a known temperature (freezing point or boiling point of water) using either voltage drop measured across thermistor at the J8 terminal, or by deter- mining the resistance with unit shut down and thermistor dis- connected from J8. Compare the values determined with the value read by the control in the Temperatures mode using the scrolling marquee display.

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Carrier 48/50AJ specifications Troubleshooting, Time Clock Configuration