Carrier 16JB Manuel d'utilisateur télécharger pdf (Page 4)

Features/Beneﬁts (cont)

Factory-trained service organiza-

tion — Carrier’s extensive service

organization offers trained and experi-

enced service technicians in every

major city. In addition to routine main-

tenance and repair services,

Carrier also offers a wide array of pre-

ventative maintenance, full mainte-

nance, and/or extended service con-

tracts which can be custom-tailored to

fulﬁll any service requirements.

Leakproof hermetic pumps cut

maintenance costs — Carrier’s

proven solution and refrigerant pump/

motors are leakproof, completely

self-contained, and hermetically sealed.

The hermetic design eliminates the

need for a separate, complicated, and

possibly leakprone seal water system

and auxiliary water piping, while

providing leak tightness and longer

machine life. There are no pack-

ing glands or seals to maintain — air

cannot leak in, ﬂuids cannot leak

out. Specially designed bearings ab-

sorb both radial and axial thrusts

to ensure correct ﬁt at all times. There

is no possibility of external contami-

nation since the ﬂuid being pumped

lubricates and cools the pump and

motor assemblies. In addition, both

the rotor and stator are separated by

a stainless steel liner that protects

the windings from the ﬂuid being

pumped. As an additional safety fea-

ture, thermal overload switches are

embedded in the stator to protect

against high winding temperature. The

pumps are ﬁeld serviceable and in-

spection is recommended after 6

years of operation. Pump isolation

valves are not included on 16JB ma-

chines to minimize potential leak

paths into the machine. The pump

isolation valves are not required

because of the exceptionally high

reliability of the pump/motor

assemblies.

Superior corrosion protection —

Absorption chillers must be protected

from the internal corrosion that is

always present when lithium bromide

solution is in contact with internal

machine surfaces. The Carrier 16JB

absorption chiller incorporates a

highly effective corrosion inhibitor

to provide an extra margin of

protection against internal corrosion.

Other inhibitors may necessitate

the use of exotic tube materials in cer-

tain heat exchangers since they are

less effective and require frequent

maintenance and analysis. The supe-

rior corrosion protection of the inhibi-

tor allows for the use of standard

copper tubes throughout the machine

(except for the generator [90/10

cupro-nickel]). This results in long ma-

chine life and dependable operation.

Rugged machine construction

— Every Carrier 16JB offers numer-

ous standard features designed to

provide reliable, trouble-free opera-

tion. The machine is fabricated to

meet stringent manufacturing and

design requirements. Non-clogging,

corrosion-proof spray nozzles ensure

against both corrosion and possible

blockage for continuous, reliable

operation. U-bend tubes of 90/10

cupro-nickel in the generator allow

the tube bundle to expand and adjust

freely when subjected to rapid tem-

perature changes. Allowing for this

thermal growth and expansion reduces

tube wear and helps prevent prema-

ture tube failure. The numerous stand-

ard features mean that every 16JB

single effect chiller is built to withstand

the most rigorous duty, whether it is

used for comfort cooling or light

process applications.

Automatic motorless purge ex-

tends machine life, ensures opti-

mum efﬁciency and performance

— The purge system on an absorp-

tion chiller is critical to ensuring long

machine life and efﬁcient opera-

tion. All absorption chillers operate in

a vacuum and generate hydrogen

(and other noncondensable gases) in

small quantities, whether they are

vacuum tight or properly inhibited.

These gases are present in sufﬁcient

volume to interfere with proper

machine operation, making it impera-

tive that they be removed to protect

against internal corrosion, lithium bro-

mide solution crystallization, and/or

reduction of chiller capacity. The

Carrier motorless purge system pro-

tects against these potential hazards

by operating continuously during

machine operation.

How the motorless purge operates

—The absorber eductor device dis-

charges the solution and noncondens-

ables into the overﬂow line where

noncondensables are separated from

the solution. Noncondensables ﬂow up

the overﬂow line and into the con-

denser. The solution ﬂows through the

secondary heat exchanger and into

the sump of the absorber.

The condenser eductor device draws

the noncondensables from the con-

denser and discharges the solution

and noncondensable mix into the stor-

age chamber. The mix separates, the

noncondensables remain and the solu-

tion returns through the solution

return line to the secondary heat ex-

changer and into the sump of the

absorber.

As noncondensables accumulate in

the external storage chamber, they are

isolated from the chiller and cannot

re-enter the chiller even during

shutdown. These gases must be peri-

odically exhausted (normally once a

day or as indicated by the purge indi-

cator) from the storage chamber by

a simple procedure which can be per-

formed while the chiller is running.

Evacuation is accomplished by manu-

ally positioning valves to pressurize

the storage chamber with lithium bro-

mide solution and then exhausting

the noncondensable gases into the

atmosphere.

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Carrier 16JB Manuel d'utilisateur Page 4

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