Carrier 23XL Installation Instructions Manual

Screw liquid chillers are designed to provide safe and re-
liable service when operated within design specifica-
tions. When operating this equipment, use good judgment
and follow 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 machine instruc-
tions as well as those listed in this guide.
DO NOT VENT refrigerant relief devices within a building. Outlet
from rupture disc or relief valve must be vented outdoors in ac-
cordance with the latest edition of ANSI/ASHRAE 15 (American
National Standards Institute/American Society of Heating,
Refrigeration, and Air Conditioning Engineers). The accumulation
of refrigerant in an enclosed space can displace oxygen and cause
asphyxiation.
PROVIDE adequate 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 ir-
regularities, unconsciousness, or death. Intentional misuse can be
fatal. Vapor is heavier than air and reduces the amount of oxygen
available for breathing. Product causes eye and skin irritation. De-
composition products are hazardous.
DO NOT USE OXYGEN to purge lines or to pressurize a machine
for any purpose. Oxygen gas reacts violently with oil, grease, and
other common substances.
DO NOT USE air to leak test. Use only refrigerant or dry
nitrogen.
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 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 FLAMECUT any refrigerant line or vessel
until all refrigerant (liquid and vapor) has been removed 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 machine sections or
the entire assembly.
DO NOT work on high-voltage equipment unless you are a quali-
fied electrician.
DO NOT WORK ON electrical components, including control
center, 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.
LOCK OPEN AND TAG electrical circuits during servicing. IF WORK
IS INTERRUPTED, confirm that all circuits are deenergized be-
fore resuming work.
DO NOT syphon refrigerant.
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 liquid refrigerant enters the eyes, IMME-
DIATELY FLUSH EYES with water and consult a physician.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 2 PC 211 Catalog No. 532-303
Tab 5e

Installation Instructions

SAFETY CONSIDERATIONS

Printed in U.S.A.
Hermetic Screw Liquid Chillers
With HCFC-22 and HFC-134a
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
attempt to 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.
CHECK THE REFRIGERANT TYPE before adding refrigerant to
the machine. The introduction of the wrong refrigerant can cause
machine damage or malfunction.
Operation of this equipment with refrigerants other than those
cited herein should comply with ANSI/ASHRAE-15 (latest
edition). Contact Carrier for further information on use of this
machine with other refrigerants.
DO NOT ATTEMPT TO REMOVE fittings, covers, etc., while ma-
chine is under pressure or while machine is running. Be sure pres-
sure is at 0 psig (0 kPa) before breaking any refrigerant connection.
CAREFULLY INSPECT all relief valves, rupture discs, and other
relief devices AT LEAST ONCE A YEAR. If machine operates in
a corrosive atmosphere, inspect the devices at more frequent
intervals.
DO NOT ATTEMPT TO REPAIR OR RECONDITION any
relief valve when corrosion or build-up of foreign material (rust,
dirt, scale, etc.) is found within the valve body or mechanism. Re-
place the valve.
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.
DO NOT STEP on refrigerant lines. Broken lines can whip about
and release refrigerant, causing personal injury.
DO NOT climb over a machine. 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 mechanical equipment when there is a risk of
slipping or losing your balance.
BE AWARE that certain automatic start arrangements CAN
ENGAGE THE STARTER, TOWER FAN, OR PUMPS. Open the
disconnect ahead of the starter, tower fan and pumps. Shut off the
machine or pump before servicing equipment.
USE only repaired or replacement parts that meet the code require-
ments of the original equipment.
DO NOT 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.
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
water.
Form 23XL-2SI Pg 1
23XL
50/60 Hz
9-94 Replaces: 23XL-1SI