Carrier HS070-160 manual Programming Functions

Programming Functions

SERVICE FUNCTION - The service function allows the operator to verify factory configurations and read or change field configurations. The service subfunctions are listed below. (See Table 6 for details.)

The operator must use this subfunction to

log on before performing any other subfunction, a n d to log off after completing service subfunctions.

pJ@- Used to verify software version and

language option.

Used to verify factory configurations (number of compressors).

pq m .-..Usrd to read or change field configuration

for number of unloaders and reset type and to enable the machine for load shed, pulldown, or brine operation.

NOTE: The nf key is used to enable or turn on certain

functions; the clI key is used to disable thesefunctions.

key is pressed the display will show 00.00.

SET POINT FUNCTION -- Set points are entered through the keyboard. Set points can be changed within the upper and lower limits, which are fixed. The ranges are listed below.

Chilled Water Set Point

Water:

4 0 to 70 F (4.4 to 21 C)

Brine (Special Order Units): 1 5 to 70 F (-9.4 to 21 C)

Rc~set Set Point

0 t o 95 F (-17.8 to 35 C) Reset Limit

0t o 80 F (-17.8 to 26.7 C) Reset Ratio

0t o 100%

Ilemand Limit Set Poiot5

Step I Capacity Reduction:

0% t o 100%

Step 2 Capacity Reduction:

0% to 100%

Set points a r e grouped in subfunctions as follows:

Displays chilled water set points.

a.The first value shown is the occupied chilled water set point.

b.The next value to b e displayed depends on how the schedule function h .as been programmed. (See below.)

If dual set point has been selected, the next set point

-

after + has been pressed will be the unoccupied L - J

chilled water set point; this will be followed by the modified chilled water set point.

I f single set point or inactive sched ule has been selected

in the schedule function, t h e n when + i s d e p r e s s e d ii

the display will s h o w t h e modified chilled water set point.

c. The modified chilled water set point is determined by the microprocessor as a result of the reset function, and is displayed for reference only; it cannot be set or changed by the operator. If reset is not in effect, the modified set point will be the same as either the occu- pied or unoccupied chilled water set point, according to how the schedule function has been programmed.

Displays the reset, reset Limits, and reset

ratio set points, These set points are not accessible when reset type has been configured for NONE in the service funct ion.

cl3 SET Displays the demand limit set points. il ---

4	Displays time of day and day of week.
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SCHEDULE FUNCTION ~ This function provides a means to automaticafly switch the chiller from an occupied mode to an unoccupied mode. When using the schedule function, the chilled water pump relay, located in the unit control box, must be used to switch the chilled water pump on and off. The chilled water pump relay will start the chilled water pump but the compressors will not run until the remote chilled water pump interlock con- tacts are closed and the leaving chilled water temperature is above set point. If a remote chilled water pump inter- lock is not used. the first compressor will start (upon a call for cooling) approximately one minute after the chilled water pump is turned on.

The schedule function can be programmed for inactive, si ngle set point. or dual set pntnt operation.

When the schedule is configured for inactive, the chilled water pump relay remains energized continuously but is not used since the chiller is usually controlled by remote chilled water pump interlock contacts.

When the schedule is set for single set point operation, the chilled water pump relay will be energized whenever the chiller is in the occupied mode regardless of whether the chiller is running. When the chiller is in unoccupied mode, the chilled water pump relay will not be energized.

When the schedule is set for dual set point, the chilled water pump relay will be energized continuously, in both occupied and unoccupied modes. The occupied mode places the occupied chilled water set point into effect; the unoccupied mode places the unoccupied chiller water set point into effect.

The schedule consists of from one to 8 occupied time periods, set by the operator. These time periods can be flagged to be in effect or not in effect on each day of the week. The day begins at 00.00 and ends at 24.00. The machine will be in unoccupied mode unless a scheduled time period is in effect. If an occupied period is to extend past midnight, it must be programmed in the following manner: Occupied period must end at 24:00 hours (midnight); a new occupied period must be programmed to begin at 0O:OO hours.

The time schedule can be overridden to keep the unit in the occupied mode for one, 2, 3 or 4 hours on a one- time basis.

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