Product data

Features/Benefits (cont)
Microprocessor control
features/benefits
Direct Digital Product Integrated
Control (PIC) — Carrier’s PIC
provides unmatched flexibility and
functionality. Each unit integrates
directly with Carrier’s Comfort Net-
work (CCN), providing a system solu-
tion to controls applications. PICs
are pre-programmed to meet precise
control requirements.
PID (Proportional/Integral/
Derivative) control algorithms —
PID algorithms provide tight chilled
water control to optimize chiller
operation.
Local Interface Device (LID) —
The LID, which can be configured to
display in English or Metric units, pro-
vides unparalleled ease of operation.
A 16-line by 40-character backlit,
liquid crystal display (LCD) features
4 menu-specific softkeys. A default
display offers a one-glance review of
key chiller operation data, simplify-
ing the interaction between machine
and user.
Chilled water reset — Reset can be
accomplished manually or automati-
cally from the building management
system. Chilled water reset saves
energy when warmer chilled water
can be used.
Steam demand limit — During
start-up, the steam demand limit pro-
vides boiler protection (low feed-
water, steam starvation) by limiting
control valve travel during the initial
warm-up period.
Ramp loading — Ramp loading
ensures a smooth pulldown of water
loop temperature and prevents a rapid
increase in steam consumption.
Advanced crystallization protec-
tion — Protects against crystallization
by automatically sensing impending
abnormalities in the absorption oper-
ating cycle and taking a series of
actions to either self-correct and/or
limit the chiller from approaching the
cycle crystallization line.
Absorption cycle state points —
Absorption cycle state points pro-
vide the operator with precise and
dynamic cycle operating conditions at
any time during chiller operation.
They save time by eliminating the cum-
bersome task of taking solution
samples and calculating state points
and assist in both chiller operation
and diagnostics.
Refrigerant low temperature over-
ride — The capacity control valve
position is inhibited to prevent
freeze-up and ensure continuous chiller
operation.
Extensive service menu — Unau-
thorized access to the service menu
can be password-protected. Built-
in, enhanced, diagnostic capabilities
assist in troubleshooting and rec-
ommend proper corrective action for
pre-set alarms, resulting in more up
time.
Alarm history — The last 25 alarms
and/or alerts are retained in memory
with date and time stamps. Alarm
histories reduce troubleshooting time
and cost.
Additional controls features/
benefits
• Encapsulated circuit boards —
Designed and built by Carrier, encap-
sulated circuit boards offer superior
reliability compared to open board
designs.
• PROM (programmable read-only
memory) based modules — PROM
modules provide protection dur-
ing power failures and eliminate
time-consuming reconfiguration.
They require no battery back-up.
• Modular pull-out/plug-in design —
This feature reduces field wiring
requirements and simplifies
installation.
• Low voltage (24 v) design — Low
voltage provides ultimate assur-
ance of personal safety and control
integrity.
Reliable operation
16JB PIC control system features
automatic monitoring and pre-
cise control of chiller operation
— Each Carrier 16JB single-effect
chiller includes a pre-programmed,
factory-mounted and factory-wired
PIC panel which is functionally tested
prior to shipment. Chiller monitor-
ing and control is automatic and con-
tinuous, and the LID on the front
panel displays chiller operational sta-
tus and fault indications in English
or metric units. The PIC panel com-
ponents include a Local Interface
Device (LID), processor module
(ComfortWorks™ controller), two slave
processor modules (PSIO), a fused
disconnect switch, pump contactors,
ambient-compensated 3-phase pump
overloads, multi-tap control power
transformers, terminal blocks, relays,
and all other necessary safeties and
controls for proper chiller operation.
Single point electrical connection
— Installation costs are further re-
duced by eliminating field wiring be-
tween machine components. All unit-
mounted electrical items are
factory-wired to the chiller control
center and require only a single point
electrical connection to the machine
from the building’s electrical service. A
multi-tap transformer mounted in the
chiller panel provides secondary
single-phase power for the 16JB
controls.
Low sound and vibration levels
allow location flexibility — Low
sound and vibration levels are charac-
teristic of absorption chillers, prima-
rily due to the fact that the only rotating
parts are the refrigerant and solution
pumps. The overall sound level of
a Carrier 16JB is typically 80 dbA.
This allows the machine to be installed
near occupied spaces or in areas
with strict sound requirements. Low
vibration levels also make it possible
to install the chiller on upper flows
without special consideration for vibra-
tion dampening systems.
Low maintenance
Standard features simplify main-
tenance procedures — Every 16JB
is provided with numerous standard
design features that provide for conve-
nient and simple maintenance. Re-
movable waterbox covers on the
evaporator, absorber, and condenser
facilitate tube and waterbox inspection
from either end. All moving parts
are easily accessible for inspection or
replacement, as required. The U-bend
tube design in the generator greatly
reduces the likelihood of expensive
and time-consuming tube bundle
replacement. Unlike ordinary tubes,
the U-bend configuration allows the
entire tube bundle to expand or
contract as a unit when subjected to
rapid temperature changes. The tube
bundle floats and adjusts freely as a
unit, decreasing tube wear due to ther-
mal stresses and reducing tube bundle
failures. Each shell is divided by a
‘‘U-baffle’’ forming a double sump.
The U-baffle design not only forms a
thermal barrier between the sec-
tions but also allows the solution or
refrigerant to be stored temporarily on
one side of the vessel while the other
side is being serviced, consequently
reducing maintenance costs.
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