Carrier 16JB Instrukcja Użytkownika Pobierz pdf (Strona 25)

The control center shall include a 16-line by

40-characterliquidcrystal display(LCD)screen,

four function keys, stop button, and alarm

light.The microprocessorshall beconfigurable

to display either English or SI metric units.

b. The default standard display screen shall si-

multaneously indicatethe followingminimum

information:

• date and time of day

• 24-character primary system status

message

• 24-character secondary system status

message

• chiller operating hours

• entering chilled water temperature

• leaving chilled water temperature

• evaporator refrigerant temperature

• entering absorber water temperature

• leaving absorber water temperature

• leaving condenser water temperature

• strong solution temperature leaving

generator

• weak solution temperature leaving

absorber

• output signal to steam/hot water control

valve

• The defaultscreen shallbe displayedif there

is no manual activity at the control console

for 15 minutes.

c. The 4 function keys shall be software driven

within the Status, Schedule, Set Point and

Service menu structures (as described below).

1) Status Function:

In addition to the default screen, status

screens shall be accessible to view the sta-

tus of every point monitored by the con-

trol center including:

• refrigerant temperature

• vapor condensate temperature

• generator temperature

• solution concentrations

• capacity control valve position

• control point settings

• refrigerant level switches

• solution pump starts

• absorber loss

• evaporator approach temperature

• absorber and condenser approach

temperatures

• discrete output status of various devices

2) Schedule Function:

The chiller controls shall be conﬁgurable

for manual or automatic startup and shut-

down. In automatic operation mode, the

controls shall be capable of automatically

starting and stopping the chiller accord-

ing to a stored user programmable

occupancy schedule.The controls shallin-

clude built-in provisions for accepting a

minimumoftwo365-day occupancysched-

ules. Each schedule shall allow a mini-

mum of 8 separate occupied and unoccu-

pied periods, any or all of which can be

scheduled by individual day for any or all

days of the week, with a separate sched-

ulefor holidays.Schedulesshallallow speci-

ﬁcation of daylight savings start/end and

up to 18 user-deﬁned holidays up to one

year in advance (month, day, and dura-

tion in days). Display of the occupancy

schedules shall be viewable on the LCD

screen.Eachscheduleshall provideameans

of conﬁguring an occupancy timed over-

ride to permit a ‘‘one time extension’’ of

an occupiedperiod on theconﬁgured day.

The controls shall also provide for chiller

start-up and shutdown via remote contact

closure from a customer supplied device,

or from a building management system

software command.

3) Set Point Function:

The controls shall provide the capability

to view and change the leaving chilled wa-

ter set point, entering chilled water set

point, and demand limit set point at any-

time during chiller operating or shutdown

periods. The controls shall allow for the

speciﬁcation of capacity control via either

leaving chilled water or entering chilled

water.

4) Service Function:

The controlsshall providea password pro-

tected service function which allows au-

thorized individuals to:

• view an alarm history ﬁle which shall

contain the last 25 alarm and/or alert

messages with time and date stamp.

Thesemessages shallbe displayedintext

form, not codes.

• execute a chiller controls test function

for quick identiﬁcation of malfunction-

ing components.

• view and/or modify chiller

conﬁguration.

• view and/or modify chiller occupancy

periods.

• view and/ormodify scheduleholiday pe-

riods.

• view and/or modify schedule override

periods.

• view and/or modify system time and

date.

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Carrier 16JB Instrukcja Użytkownika Strona 25

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