Carrier 30GN040-420 operating instructions Example 9 Ð Using the Schedule Function

NOTE: This is true only if the occupied period starts at 00:00 (midnight). If the occupied period starts at a time other than midnight, then the occupied period must end at 00:00 hours (midnight) and new occupied period must be programmed to start at 00:00 in order for the chiller to stay in the occu- pied mode past midnight.

The time schedule can be overridden to keep unit in oc- cupied mode for one, 2, 3, or 4 hours on a one-time basis. See Example 9.

All subfunctions of schedule function are password

protected except the override subfunction, . Pass-

word entry into subfunctions through ,

is done through service function. See page 43, logging on/ logging off.

Figure 10 shows a schedule for an office building with the chiller operating on a single set point schedule. The sched- ule is based on building occupancy with a 3-hour off-peak cool-down period from midnight to 3 a.m. following the week- end shutdown. To learn how this sample schedule would be programmed, see Example 9.

NOTE: This schedule was designed to illustrate the pro- gramming of the schedule function and is not intended as a recommended schedule for chiller operation.

Example 9 Ð Using the Schedule Function

KEYPAD	DISPLAY	COMMENT
ENTRY
	OVRD 0	No scheduled override
		in effect
	OVRD 3	3 hours override in effect
	OVRD 0	Override cancelled
	CLOCK 0	Schedule function is inactive
	CLOCK 1	Schedule function is enabled
		through local unit clock
PROGRAMMING PERIOD 1:

Example 9 Ð Using the Schedule Function (cont)

KEYPAD	DISPLAY	COMMENT
ENTRY
PROGRAMMING PERIOD 2:
	PERIOD 2	De®ne schedule period 2
	OCC 00.00	Start of occupied time
	OCC 7.00	Occupied time will start
		at 7:00 a.m.
		Start of unoccupied time
	UNO 00.00	(end of period). For this
		example, period 2 should
		end at 18:00 (6:00 p.m.)
	UNO 18.00	Period 2 ends at 18:00
		(6:00 p.m.)
		Monday is now ¯agged no
	MON NO	for period 2. To put period 2
		into effect on Monday,
		Monday must be ¯agged yes
	MON YES	Monday is now ¯agged for
		period 2 to be in effect
		Tuesay is now ¯agged no
		for period 2. To put period 2
	TUE NO	into effect on Tuesday,
		Tuesday must be ¯agged
		yes
	TUE YES	Tuesday is now ¯agged for
		period 2 to be in effect
		For this example, period 2
		is to be in effect only on
		Monday and Tuesday.
	WED YES	All other days must be
		checked to be sure that
		they are ¯agged no. If
		a day is ¯agged yes,
		change to no
	WED NO	Wednesday is now ¯agged
		no for period 2
	PERIOD 3	De®ne schedule
		period 3
	OCC 00.00	Start of occupied
		time
	OCC 7.00	Occupied time will start
		at 7:00 a.m.
		Start of unoccupied time
	UNO 00.00	(end of period 3). For this
		example, period 3 should

PERIOD 1

OCC 00.00

UNO 00.00

UNO 3.00

MON NO

MON YES

TUE YES

TUE NO

De®ne schedule period 1. Start of occupied time

For this example, ®rst period should start here (at midnight) so no entry is needed

Start of unoccupied time (end of period). For this example, period 1 should end at 3:00 a.m.

Period 1 ends at 3:00 a.m.

Monday is now ¯agged no for period 1. To put period 1 into effect on Monday, Monday must be ¯agged yes

Monday is now ¯agged for period 1 to be in effect

For this example, period 1 is to be in effect on Monday only. All other days must be checked to be sure that they are ¯agged no. If any day is ¯agged yes, change to no

Tuesday is now ¯agged no for period 1

	end at 21:30 (9:30 p.m.)
UNO 21.30	Period 3 ends at 21:30
	(9:30 p.m.)
	Check to be sure that
MON NO	Monday and Tuesday are
	¯agged no for period 3
TUE NO
WED NO	Wednesday is ¯agged
	no, change to yes
WED YES	Wednesday is now
	¯agged yes for period 3
THUR NO	Check to be sure that all
	other days are ¯agged no
FRI NO
SAT NO
SUN NO

CCN Ð Carrier Comfort Network

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