Local Holiday Schedules (Hol.l); Daylight Savings Time (Day.s); Troubleshooting; Complete Unit Stoppage - Carrier WeatherMaker 48A2020 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

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Friday In Period (PER.X
This variable is used to include or remove Friday from the
schedule. Each period is assigned an occupied on and off time.
If this variable is set to YES, then Friday will be included in
that period's occupied time schedule. If this variable is set to
NO, then the period's occupied time schedule will not be used
on Friday. This variable can be set for Periods 1 through 8.
Saturday In Period (PER.X
This variable is used to include or remove Saturday from the
schedule. Each period is assigned an occupied on and off time.
If this variable is set to YES, then Saturday will be included in
that period's occupied time schedule. If this variable is set to
NO, then the period's occupied time schedule will not be used
on Saturday. This variable can be set for Periods 1 through 8.
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Sunday In Period (PER.X
This variable is used to include or remove Sunday from the
schedule. Each period is assigned an occupied on and off time.
If this variable is set to YES, then Sunday will be included in
that period's occupied time schedule. If this variable is set to
NO, then the period's occupied time schedule will not be used
on Sunday. This variable can be set for Periods 1 through 8.
Holiday In Period (PER.X
This variable is used to include or remove a Holiday from the
schedule. Each period is assigned an occupied on and off time. If
this variable is set to YES, then holidays will be included in that
period's occupied time schedule. If this variable is set to NO,
then the period's occupied time schedule will not be used on hol-
idays. This variable can be set for Periods 1 through 8.
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Occupied From (PER.X
This variable is used to configure the start time of the Occupied
period. All days in the same period set to YES will enter into
Occupied mode at this time.
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Occupied To (PER.X UNC)
This variable is used to configure the end time of the Occupied
period. All days in the same period set to YES will exit Occu-
pied mode at this time.

Local Holiday Schedules (HOL.L)

This submenu is used to program the local holiday schedules.
Up to 30 holidays can be configured. When a holiday occurs,
the unit will follow the occupied schedules that have the HOL-
IDAY IN PERIOD point set to YES.
Holiday Start Month (HD.01 to HD.30
This is the start month for the holiday. The numbers 1 to 12
correspond to the months of the year (e.g., January = 1).
Holiday Start Day (HD.01 to HD.30
This is the start day of the month for the holiday. The day can
be set from 1 to 31.
Holiday Duration (HD.01 to HD.30
This is the length in days of the holiday. The holiday can last
up to 99 days.

Daylight Savings Time (DAY.S)

The daylight savings time function is used in applications
where daylight savings time occurs. The function will automat-
ically correct the clock on the days configured for daylight sav-
ings time.
DAYLIGHT SAVINGS START (DS.ST)
This submenu configures the start date and time for daylight
savings.
Daylight Savings Start Month (DS.ST
This is the start month for daylight savings time. The numbers 1 to
12 correspond to the months of the year (e.g., January = 1).
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DAYS FRI)
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DAYS SAT)
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DAYS SUN)
 
DAYS HOL)
OCC)
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MON)
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DAY)

LEN)
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ST.MN)
Daylight Savings Start Week (DS.ST
This is the start week of the month for daylight savings. The
week can be set from 1 to 5.
Daylight Savings Start Day (DS.ST
This is the start day of the week for daylight savings. The day
can be set from 1 to 7 (Sunday=1, Monday=2, etc.).
Daylight Savings Minutes To Add (DS.ST
This is the amount of time that will be added to the time clock
for daylight savings.
DAYLIGHT SAVINGS STOP (DS.SP)
This submenu configures the end date and time for daylight
savings.
Daylight Savings Stop Month (DS.SP
This is the stop month for daylight savings time. The numbers 1 to
12 correspond to the months of the year (e.g., January = 1).
Daylight Savings Stop Week (DS.SP
This is the stop week of the month for daylight savings. The
week can be set from 1 to 5.
Daylight Savings Stop Day (DS.SP
This is the stop day of the week for daylight savings. The day
can be set from 1 to 7 (Sunday=1, Monday=2, etc.).
Daylight Savings Minutes To Subtract (DS.SP
This is the amount of time that will be removed from the time
clock after daylight savings ends.

TROUBLESHOOTING

The scrolling marquee display shows the actual operating con-
ditions 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 conditions that can cause the unit not to pro-
vide 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 101, 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 101.

Service Analysis

Detailed service analysis can be found in Tables 78-81 and in
Fig. 19.

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.
83
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ST.WK)
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ST.DY)
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MIN.A)
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SP.MN)
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SP.WK)
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SP.DY)
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MIN.S)