Carrier 16JB Bedienungsanleitung PDF herunterladen (Seite 6)

Features/Beneﬁts (cont)

Carrier Cycle-Guard™ anti-

crystallization controls maintain

proper solution concentration

— The 16JB automatically limits solu-

tion concentration in several ways to

avoid both crystallization and overdilu-

tion to provide dependable, trouble-

free operation. Crystallization of the

lithium bromide solution depends

on the combination of temperature

and concentration. Carrier’s Cycle-

Guard concentration control sys-

tem automatically monitors the refrig-

erant water level in the evaporator

in conjunction with the solution tem-

perature returning to the absorber.

Because concentration varies with the

amount of water in the lithium bro-

mide solution, a rising evaporator

level indicates less water in the solu-

tion and thus a higher solution concen-

tration. When the refrigerant in the

evaporator rises to a preset level,

water is transferred from the evapora-

tor to the absorber, thus preventing

overconcentration to ensure

continuous, reliable operation even at

cooling water temperatures as low

as 55 F (12.8 C).

The 16JB also incorporates a

simple, passive method of control to

correct any crystallization that would

normally start to occur on the

shellside of the low temperature solu-

tion heat exchanger under abnor-

mal conditions. As the hot solution

begins to back up in the generator as

a result of any shellside blockage, it

rises above the overﬂow pipe and

returns directly to the absorber. It is

subsequently pumped through the

tubeside (heating the shellside) to

restore proper operation. In addition

to this passive method of control,

the 16JB PIC advanced crystallization

protection senses any impending

abnormalities in the operating cycle

and self corrects and/or limits the

chller from any possibility of crystalli-

zation, adding another layer of protec-

tion and reducing chiller down time.

In addition, the 16JB automatic

dilution cycle ensures proper concen-

tration after a scheduled unit shut-

down so that the unit will not crystallize

when the machine cools to ambient

or machine room temperature. The

dilution cycle controls operation of the

pumps until the refrigerant drops to

a predetermined level and the dilution

level switch opens. The opening of

the dilution level switch deenergizes

the pumps after shutdown. This dilutes

the solution to prevent an overcon-

centration condition. Crystallization is

also minimized by the gravity drain

feature of the generator on the 16JB.

The force of gravity and top-mounting

of the generator above the absorber

enable the strong solution to drain out

of the generator should a power out-

age occur.

CYCLE-GUARD SYSTEM OPERATION SCHEMATIC

LEGEND

NC — Normally Closed

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