2
WARNING
Failure to follow these procedures may result in personal inju-
ry or death.
DO NOT USE TORCH to remove any component. System
contains refrigerant which can be under pressure.
To remove a component, wear protective gloves and goggles
and other necessary safety equipment, and proceed as follows.
a. Shut off electrical power to unit.
b. Recover refrigerant from system using both high-
pressure and low-pressure ports.
c. Traces of vapor should be displaced with nitrogen
and the work area should be well ventilated. Refrig-
erant in contact with an open flame produces toxic
gases.
d. Cut component connection tubing with tubing cutter
and remove component from unit.
e. Carefully unsweat remaining tubing stubs when nec-
essary.
DO NOT USE eyebolts or eyebolt holes to rig machine sec-
tions or the entire assembly.
DO NOT work on high-voltage equipment unless you are a
qualified electrician.
DO NOT WORK ON electrical components, including con-
trol panels, switches, variable frequency drives (VFDs), or
compressors until you are sure ALL POWER IS OFF and no
residual voltage can leak from capacitors.
LOCK OPEN AND TAG electrical circuits during servicing.
IF WORK IS INTERRUPTED, confirm that all circuits are
de-energized before 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 liquid refrigerant enters the eyes,
IMMEDIATELY FLUSH 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 neces-
sary to heat refrigerant, use only warm (110°F [43°C]) water.
DO NOT REUSE disposable (nonreturnable) cylinders or at-
tempt 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 refriger-
ant 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.
BEFORE ADDING INHIBITOR to the unit, be sure to check
the type. Using the wrong type could result in damage to the
unit. Factory unit comes supplied with inhibitor.
DO NOT ATTEMPT TO REMOVE fittings, covers, etc., with
refrigerant in the machine or while machine is running. Be
sure pressure is at 0 psig (0 kPa) before breaking any refriger-
ant connection. Note that at 65°F (18°C) the machine is at near
0 psig (0 kPa) so ensure to properly check for the existence of
refrigerant in the machine.
CAREFULLY INSPECT all relief valves, rupture discs, and
other safety relief devices AT LEAST ONCE A YEAR. If ma-
chine operates in a corrosive atmosphere, inspect the devices
at more frequent intervals.
WARNING
DO NOT ATTEMPT 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 mecha-
nism. Replace the valve or device.
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.
Prior to installing or servicing this equipment ensure that per-
sonal protective equipment (PPE) is worn as required per
OSHA or other local regulations.
For servicing or installing components where there is a risk of
arc flash the technicians must wear personal protective equip-
ment as identified in NFPA (National Fire Protection Associa-
tion) 70E or other local country-specific requirements for arc
flash protection.
CAUTION
Failure to follow these procedures may result in personal inju-
ry or damage to equipment.
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
components 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 VFD, TOWER FAN, OR PUMPS. Open the
disconnect ahead of the VFD, tower fan, and pumps. Shut off
the machine or pump before servicing equipment.
USE only repaired or replacement parts that meet the code re-
quirements 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 indica-
tors, 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
corrosion, rust, leaks, or damage.
PROVIDE A DRAIN connection in the vent line near each
pressure relief device to prevent a build-up of condensate or
rain water. Ensure to slope piping way from relief device.
DO NOT re-use compressor purge oil or any oil that has been
exposed to the atmosphere. Dispose of oil and refrigerant per
local codes and regulations.
DO NOT introduce oil to the refrigerant circuit with refriger-
ant recovery containers, vacuum pump, or other means.
DO NOT leave refrigerant system open to air any longer than
the actual time required to service the equipment. Seal circuits
being serviced and charge with dry nitrogen to prevent con-
tamination when timely repairs cannot be completed.
