Carrier HS070-160 manual Iii

p-JB(Modes) The operating mode codes are dis-

played to indicate the operating status of the unit at a given time. (See Table 7).

The modes are explained in the Troubleshooting sec- tion on page 12.

[3-i(Stages)F] This subfunction displays the capac-

ity stage number, from 1 to 8. See Table 4 for compressor loading sequence to enter the STAGES subfunction,

depress m F] and use the m key to display the

stage number.

(Set Point) This subfunction displays the

leaving water temperature and the Leaving chilled water set point. If the unit is programmed for dual set point, the chilled water set point currently in effect (either occupied or unoccupied) will be displayed. If reset is in effect, the unit will be operating to the modified chilled water set point. This means that the leaving water tem- perature may not equal the chilled water set point. The modified chrlled water set point will not be displayed in the status function. To read the modified chilled water set point, refer to the Set Point Function section, page 11.

To enter the set point subfunction, depress pqz-],

then use the $ key to display the leaving chilled

III

water set point followed by the leaving water temperature.

EKISTAT (Temperature) The temperature subfunction displays the readings at temperature sensing thermistors.

To read a temperature, enter then scroll to

the desired temperature using i key. Table 6 shows

the order of the readouts. c l

17m-l(Pressure) This subfunction displays the

status of the oil pressure and loss of charge switches. The display will show LOW or KRM for the oil pressure switch and LOW or SAFE for loss of charge switch.

(Position) The position subfunction displays

the current position of the electronic expansion valves in steps:

Fully Open (760)

Operating Position ( 160 Minimum) Fully Closed, Circuit Shut Down (0)

TEST FLJNCTlOh’ - The test 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 com- pressors. The solenoids and unloaders will energize for 3 minutes. The 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 ex- plained below. Refer to Table6 for all the elements in the subfunctions.

p-j i;;;;i ~- Displays the status of all inputs.

1-q m - Tests the outputs from the processor,

except for compressors.

[T;;;;i-Y-j - Tests the compressors.

k1 I:ESTI ~ Takes the unit out of Quick Test. uu

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 4 key. A G

test can be terminated by pressing ) . Pressing 4

c lEl

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 ENTR	o r a d v a n c e p a s t i t b y p r e s s i n g	h .
El	c	l

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 function

until q c•TEST is entered, or, if the keyboard is not used for 10 minutes, the unit will automatically leave the Quick Test function.

IO