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Flashcards in Data Aire CRAC Deck (18):
1

COMPRESSOR SHORT-CYCLE ALARM

COMPRESSOR SHORT-CYCLE ALARM

1. The alarm is programmed (ON or OFF) through sub-menu 4-8. A compressor short-cycle alarm will activate if the compressor has been energized ten (10) times in a one(1) hour period

2. The alarm is a warning only. Compressor operation will continue.

3. One cycle is a combination of compressor starts for cooling or dehumidifi cation functions.

4. If the compressor is started 10 times in a one (1) hour period, the alarm will be activated and the message “COMPRESSOR SHORT-CYCLE” will be displayed on the processor display.

5. The compressor short-cycle time delay will be increased from fi ve (5) to six (6) minutes for the next hour.

6. The short-cycle alarm will not clear until a one (1) hour period has passed with less than ten (10) compressor starts.

2

POWER PROBLEM OR RESTART MODE

POWER PROBLEM OR RESTART MODE

The power problem or restart mode is programmed through sub-menu 3-10. There are three selections available:

1. AUTOMATIC: NO MESSAGE OR ALARM – The unit will automatically start after a power failure or reset. No audio alarm will sound. No message will be displayed on the processor display screen.

2. AUTOMATIC: MESSAGE, AUDIO ALARM & RELAY – The unit will automatically restart after a power failure or reset. The audio alarm will be activated and the message “POWER FAILURE RESTART” will be displayed on the processor display screen. Pressing the “SILENCE” button (when the message appears on the processor display screen) will clear the alarm. The alarm will also clear itself fi ve (5) minutes if there is no button activity.

3. MANUAL: MESSAGE, AUDIO ALARM & RELAY – The unit will NOT automatically restart after a power failure or reset. The “SILENCE” button must be pressed to restart the unit. The audio alarm will be activated and the message “POWER FAILURE RESTART” will be display on the processor display screen.

3

NO AIRFLOW ALARM

NO AIRFLOW ALARM

1. When no airflow is detected via the air fl ow switch, the cooling, reheat humidifi cation and dehumidifi cation functions are locked out until the alarm condition is corrected. Sub-menu 4-24 allows you to adjust the delay the polling of the air fl ow detector at start-up of the fan from 5 to 180 seconds. This is to minimize false alarms due to air turbulence.

2. The audio alarm is activated and ‘NO AIRFLOW” message will be displayed on the processor display screen.

4

DIRTY FILTER ALARM

DIRTY FILTER ALARM

When a dirty fi lter is detected, using a pressure differential switch, the audio alarm is activated and a “DIRTY FILTER: CHECK FILTERS” message will be displayed on the processor display screen until the alarm condition has been corrected

5

FIRESTAT TEMERATURE ALARM

FIRESTAT TEMERATURE ALARM

1. The fi restat temperature alarm limit is programmed through sub-menu 4-6.

2. If the return air temperature reaches the fi restat temperature alarm limit, the blower, cooling, reheat, humidifi cation and dehumidifi cation functions are immediately terminated.

3. The audio alarm is activated and “FIRESTAT TRIPPED – UNIT SHUTDOWN” message will be displayed on the processor screen.

4. The alarm will prevent the unit from operating until the alarm condition is corrected.

6

HI TEMPERATURE ALARM LIMIT

HI TEMPERATURE ALARM LIMIT

1. The high temperature alarm limit is set and/or disabled through sub-menu 4-2.

2. If the alarm is not disabled and the return air temperature rises above the high temperature alarm limit, the audio alarm is activated and “HIGH TEMPERATURE WARNING” message will be displayed on the processor display screen.

3. The audio alarm is a warning only and will not prevent any of the unit functions from operating.

4. The alarm will remain until the alarm condition is corrected.

7

LO TEMPERATURE ALARM LIMIT

LO TEMPERATURE ALARM LIMIT

1. The low temperature alarm limit is set and/or disabled through sub-menu 4-3.

2. If the alarm is not disabled and the return air temperature falls below the low temperature alarm limit, the audio alarm is activated and “LOW TEMPERATURE WARNING” message will be displayed on the processor display screen.

3. The audio alarm is a warning only and will not prevent any of the unit functions from operating.

4. The alarm will remain until the alarm condition is corrected.

8

HI HUMIDITY ALARM LIMIT

HI HUMIDITY ALARM LIMIT

1. The high humidity alarm limit is set and/or disabled through sub-menu 4-4.

2. If the alarm is not disabled and the return air humidity rises above the high humidity alarm limit, the audio alarm is activated and “HIGH HUMIDITY WARNING” message will be displayed on the processor display screen.

3. The audio alarm is a warning only and will not prevent any of the unit functions from operating.

4. The alarm will remain until the alarm condition is corrected

9

LO HUMIDITY ALARM LIMIT

LO HUMIDITY ALARM LIMIT

1. The low humidity alarm limit is set and/or disabled through sub-menu 4-5.

2. If the alarm is not disabled and the return air humidity falls below the low humidity alarm limit, the audio alarm is activated and “LOW HUMIDITY WARNING” message will be displayed on the processor display screen.

3. The audio alarm is a warning only and will not prevent any of the unit functions from operating.

4. The alarm will remain until the alarm condition is corrected.

10

LOW DISCHARGE TEMPERATURE ALARM LIMIT

LOW DISCHARGE TEMPERATURE ALARM LIMIT

1. An optional discharge air sensor is required. If the optional discharge air sensor is not installed, the setting in submenu 4-7, will automatically read “SENSOR NOT INSTALLED ON THIS UNIT”.

2. The low discharge temperature alarm limit is set and/or disabled through sub-menu 4-7.

3. If the alarm is not disabled and when the discharge air temperature falls to the low discharge temperature alarm limit, the audio alarm is activated and “LOW DISCHARGE AIR WARNING” message is displayed on the processor display screen.

4. If the optional Energy Saver with Compressor Supplement is used (see sub-menu 3-7), the compressors will be inhibited for 15 minutes.

5. The alarm will remain until the alarm condition is corrected.

11

LOW VOLTAGE WARNING ALARM

LOW VOLTAGE WARNING ALARM

1. If the measured 24 VAC control voltage that feeds the processor falls to 18 volts, the audio alarm is activated and “LOW VOLTAGE WARNING” message is displayed on the processor display screen. The low voltage warning alarm is fi xed in software and is not adjustable.

2. The alarm is a warning only and will not cause operational problems (such as contactor or relay chattering). 3. The alarm will remain until the alarm condition is corrected.

12

SCHEDULED NORMAL MAINTENANCE ALARM

SCHEDULED NORMAL MAINTENANCE ALARM

1. The scheduled normal maintenance alarm is set and/or disabled through sub-menu 3-11.

2. The alarm is a warning only and will not prevent any of the unit functions from operating.

3. The alarm will remain until the alarm condition is corrected

13

HIGH PRESSURE/INTERNAL OVERLOAD COMPRESSOR ALARM

HIGH PRESSURE/INTERNAL OVERLOAD COMPRESSOR ALARM

1. When the high head pressure switch is tripped or the compressor(s) overload contact opens, the audio alarm is activated and “HIGH PRESSURE/INTERNAL OVERLOAD: COMP 1” or “COMP 2” message is displayed on the processor display screen.

2. The alarm will prevent the compressor from operating and be MANUALLY RESET. 3. The alarm will remain until the alarm condition is corrected

14

LOW PRESSURE COMPRESSOR ALARM

LOW PRESSURE COMPRESSOR ALARM

1. When the low head pressure switch is tripped, the audio alarm will be activated and “LOW PRESSURE COMPRESSOR 1” or “COMPRESSOR 2” message is displayed on processor display screen.

2. The alarm will prevent the compressor from operating but will automatically reset when the low head pressure condition is corrected.

3. The alarm will remain until the alarm condition is corrected.

15

SMOKE ALARM

SMOKE ALARM

1. Smoke alarm requires optional smoke detector.

2. If the smoke detector senses smoke, the blower, the cooling, the reheat, humidifi cation and dehumidifi cation functions are immediately terminated.

3. The audio alarm is activated and “SMOKE DETECTOR UNIT SHUTDOWN” message is displayed on the processor display screen.

4. The alarm will prevent the unit from operating until the alarm condition is corrected and the smoke detector is MANUALLY RESET

16

HIGH CONDENSATE WATER LEVEL ALARM

HIGH CONDENSATE WATER LEVEL ALARM

1. The high condensate water level alarm requires an optional secondary fl oat switch and unit mounted condensate pump.

2. When the high condensate water level alarm is activated, the cooling, reheat, humidifi cation and dehumidifi cation functions are inhibited.

3. The audio alarm is activated and “HIGH CONDENSATE WATER LEVEL” message is displayed on the processor display screen.

4. The alarm will prevent the unit from operating until the alarm condition is corrected (condensate pump is checked and its float switch is open).

17

FAN MOTOR OVERLOAD ALARM

FAN MOTOR OVERLOAD ALARM

1. The fan motor overload alarm is optional and requires a motor overload relay contact for each motor.

2. Alarm is programmed through either sub-menus 4-12, 4-14, 4-16 and 4-18.

3. The audio alarm is activated and “FAN MOTOR OVERLOAD: CHECK MOTOR AMPERAGE” message is displayed on the processor display screen.

4. The alarm is a warning only and will not prevent any of the unit functions from operating.

5. The alarm will remain until the alarm condition is corrected

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