Start-Up, Operation, and Maintenance Instructions
SAFETY CONSIDERATIONS
Centrifugal liquid chillers are designed to provide
safe and reliable service when operated within design
specifications.When operating this equipment, use good
judgment and safety precautions to avoid damage to
equipment and property or injury to personnel.
Besure you understand and follow the procedures and
safety precautions contained in the chiller instructions
as well as those listed in this guide.
DO NOTVENT refrigerant relief valves within a building. Outlet
from rupture disc or relief valve must be vented outdoors in
accordance with the latest edition of ANSI/ASHRAE 15
(AmericanNational Standards Institute/American Society of Heat-
ing, Refrigeration, andAir Conditioning Engineers). The accumu-
lation of refrigerant in an enclosed space can displace oxygen and
cause asphyxiation.
PROVIDEadequate ventilation in accordance with ANSI/ASHRAE
15, especially for enclosed and low overhead spaces. Inhalation
of high concentrations of vapor is harmful and may cause heart
irregularities, unconsciousness, or death. Misuse can be fatal.
Vaporis heavier than air and reduces the amount of oxygen avail-
able for breathing. Product causes eye and skin irritation. Decom-
position products are hazardous.
DO NOT USE OXYGEN to purge lines or to pressurize a chiller
for any purpose. Oxygen gas reacts violently with oil, grease, and
other common substances.
NEVEREXCEED specified test pressures, VERIFY the allowable
test pressure by checking the instruction literature and the design
pressures on the equipment nameplate.
DO NOT USE air for leak testing. Use only refrigerant or dry
nitrogen.
DO NOT VALVEOFF any safety device.
BESURE that all pressure relief devices are properly installed and
functioning before operating any chiller.
DO NOT WELD OR FLAMECUT any refrigerant line or vessel
untilall refrigerant (liquid and vapor) has been removed from chiller.
Traces of vapor should be displaced with dry air or nitrogen and
thework area should be well ventilated. Refrigerant in contact with
an open flame produces toxic gases.
DO NOT USE eyebolts or eyebolt holes to rig chiller sections or
the entire assembly.
DO NOTwork on high-voltage equipment unless you are a quali-
fied electrician.
DONOT WORK ON electrical components, including control pan-
els,switches, starters, or oil heater until you are sure ALL POWER
IS OFF and no residual voltage can leak from capacitors or solid-
state components.
LOCKOPEN AND TAGelectrical circuits during servicing. IF WORK
IS INTERRUPTED, confirm that all circuits are deenergized be-
fore resuming work.
AVOIDSPILLING liquid refrigerant on skin or getting it into the
eyes. USE SAFETY GOGGLES. Washany spills from the skin
with soap and water.If liquid refrigerant enters the eyes, IMME-
DIATELYFLUSH EYES with water and consult a physician.
NEVER APPLY an open flame or live steam to a refrigerant
cylinder.Dangerous over pressure can result. When it is necessary
to heat refrigerant, use only warm (110 F [43 C]) water.
DO NOT REUSE disposable (nonreturnable) cylinders or
attemptto refill them. It is DANGEROUS AND ILLEGAL. When
cylinder is emptied, evacuate remaining gas pressure, loosen
the collar and unscrew and discard the valve stem. DO NOT
INCINERATE.
CHECKTHE REFRIGERANT TYPE before adding refrigerant to
thechiller. The introduction of the wrong refrigerant can cause dam-
age or malfunction to this chiller.
Operation of this equipment with refrigerants other than those
cited herein should comply with ANSI/ASHRAE-15 (latest edi-
tion). Contact Carrier for further information on use of this chiller
with other refrigerants.
DONOT ATTEMPTTO REMOVE fittings, covers, etc., while chiller
isunder pressure or while chiller is running. Be sure pressure is at
0 psig (0 kPa) before breaking any refrigerant connection.
CAREFULLYINSPECT all relief devices, rupture discs, and other
relief devicesAT LEAST ONCE AYEAR. If chiller operates in a
corrosive atmosphere, inspect the devices at more frequent
intervals.
DONOT ATTEMPT TO REPAIROR RECONDITION any relief
device when corrosion or build-up of foreign material (rust, dirt,
scale, etc.) is found within the valve body or mechanism. Replace
the device.
DO NOT install relief devices in series or backwards.
USECARE when working near or in line with a compressed spring.
Sudden release of the spring can cause it and objects in its path to
act as projectiles.
DO NOT STEPon refrigerant lines. Broken lines can whip about
and release refrigerant, causing personal injury.
DO NOT climb over a chiller.Use platform, catwalk, or staging.
Follow safe practices when using ladders.
USE MECHANICAL EQUIPMENT (crane, hoist, etc.) to lift or
move inspection covers or other heavy components. Even if com-
ponentsare light, use mechanical equipment when there is a risk of
slipping or losing your balance.
BE AWAREthat certain automatic start arrangements CAN EN-
GAGE THE STARTER,TOWER FAN, OR PUMPS. Open the
disconnect ahead of the starter, tower fans, or pumps.
USE only repair or replacement parts that meet the code require-
ments of the original equipment.
DONOT VENT OR DRAIN waterboxes containing industrial brines,
liquid,gases, or semisolids without the permission of your process
control group.
DO NOT LOOSEN waterbox cover bolts until the waterbox has
been completely drained.
DOUBLE-CHECK that coupling nut wrenches, dial indicators, or
other items have been removed before rotating any shafts.
DO NOT LOOSEN a packing gland nut before checking that the
nut has a positive thread engagement.
PERIODICALLYINSPECT all valves, fittings, and piping for cor-
rosion, rust, leaks, or damage.
PROVIDE ADRAIN connection in the vent line near each pres-
sure relief device to prevent a build-up of condensate or rain
water.

19XL

Hermetic Centrifugal Liquid Chillers

50/60 Hz

With HCFC-22 and HFC-134a
Manufacturerreserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 2
Tab 5a PC211 CatalogNo. 531-971 Printed in U.S.A. Form19XL-4SS Pg1 7-96 Replaces:19XL-3SS