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Start-Up, Operation, and Maintenance Instructions
Centrifugal liquid chillers are designed to provide safe
and reliable service when operated within design speci-
ﬁcations. When operating this equipment, use good judg-
ment and safety precautions to avoid damage to equip-
ment and property or injury to personnel.
Be sure you understand and follow the procedures and
safety precautions contained in the chiller instructions
as well as those listed in this guide.
DO NOT VENT refrigerant relief valves within a building. Outlet
from rupture disc or relief valve must be vented outdoors in ac-
cordance with the latest edition of ASHRAE (American Society of
Heating, Refrigeration, and Air Conditioning Engineers) 15. The
accumulation of refrigerant in an enclosed space can displace oxy-
gen and cause asphyxiation.
PROVIDE adequate ventilation in accordance with ASHRAE 15,
especially for enclosed and low overhead spaces. Inhalation of high
concentrations of vapor is harmful and may cause heart irregulari-
ties, unconsciousness, or death. Misuse can be fatal. Vapor is heavier
than air and reduces the amount of oxygen available for breathing.
Product causes eye and skin irritation. Decomposition products are
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.
NEVER EXCEED 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
DO NOT VALVE OFF any safety device.
BE SURE that all pressure relief devices are properly installed and
functioning before operating any machine.
DO NOT WELD OR FLAME CUT any refrigerant line or vessel
until all refrigerant (liquid and vapor) has beenremoved from chiller.
Traces of vapor should be displaced with dry air or nitrogen and
the work 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 NOT work on high-voltage equipment unless you are a quali-
DO NOTWORK 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-
LOCK OPENANDTAGelectrical circuitsduring servicing. IFWORK
IS INTERRUPTED, conﬁrm that all circuits are deenergized be-
fore resuming work.
AVOID SPILLING liquid refrigerant on skin or getting it into the
eyes. USE SAFETY GOGGLES. Wash any spills from the skin
with soap and water. If any enters the eyes, IMMEDIATELYFLUSH
EYES with water and consult a physician.
NEVER APPLY an open ﬂame or live steam to a refrigerant cyl-
inder. Dangerous overpressure can result. When necessary to heat
refrigerant, use only warm (110 F [43 C]) water.
DO NOT REUSE disposable (nonreturnable) cylinders or
attempt to reﬁll them. It is DANGEROUSAND ILLEGAL. When
cylinder is emptied, evacuate remaining gas pressure, loosen
the collar and unscrew and discard the valve stem. DO NOT
CHECK THE REFRIGERANT TYPE before adding refrigerant to
the chiller.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 withASHRAE-15 (latest edition). Con-
tact Carrier for further information on use of this chiller with other
DO NOTATTEMPTTO REMOVEﬁttings, covers, etc., while chiller
is under pressure or while chiller is running. Be sure pressure is at
0 psig (0 kPa) before breaking any refrigerant connection.
CAREFULLY INSPECT all relief devices, rupture discs, and other
relief devices AT LEAST ONCE A YEAR. If chiller operates in a
corrosive atmosphere, inspect the devices at more frequent
DO NOTATTEMPT TO REPAIR OR 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
DO NOT install relief devices in series or backwards.
USE CARE 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.
RUN WATER PUMPS when removing, transferring, or charg-
DO NOT STEP on refrigerant lines. Broken lines can whip about
and cause 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-
ponents are light, use such equipment when there is a risk of slip-
ping or losing your balance.
BE AWARE that certain automatic start arrangements CAN EN-
GAGE THE STARTER. Open the disconnect ahead of the starter
in addition to shutting off the machine or pump.
USE only repair or replacement parts that meet the code require-
ments of the original equipment.
DO NOTVENTOR DRAIN waterboxes containing industrialbrines,
liquid, gases, or semisolids without permission of your process con-
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.
PERIODICALLY INSPECT all valves, ﬁttings, and piping for cor-
rosion, rust, leaks, or damage.
PROVIDE A DRAIN connection in the vent line near each pres-
sure relief device to prevent a build-up of condensate or rain
Externally Geared Centrifugal Liquid Chillers
1500 to 2250 Nominal Tons (5280 to 7910 kW)
Manufacturer reserves the right to discontinue, or change at any time, speciﬁcations or designs without notice and without incurring obligations.
PC 211 Catalog No. 531-721 Printed in U.S.A. Form 17EX-1SS Pg 1 7-97 Replaces: New