Carrier 17DA - Manual

Number One
AirConditbning
Mater
e
Division of
Carrier Corporation
Carrier Parkway • Syracuse. N.Y. 13221
Open Centrifugal Refrigeration Machines
A SAFETY GUIDE
Centrifugal liquid chillers are designed to provide safe
and reliable service when operated within design speci­
fications. When operating this equipment, use good
judgment and safety precautions to avoid damage to
equipment and property or injury to personnel.
Be sure you understand and follow the procedures and
safety precautions contained in the machine instructions
as well as those listed in this guide.
A DANGER
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.
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.
A WARNING
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 qualified electrician.
DO NOT WORK ON electrical components, including
control panels, 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 servic­
ing. IF WORK IS INTERRUPTED, confirm that all
circuits are de-energized before resuming work.
DO NOT syphon refrigerant by mouth.
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, IMMEDIATELY FLUSH EYES with water and
consult a physician.
NEVER APPLY an open flame or live steam to a
refrigerant cylinder. Dangerous overpressure can result.
When necessary to heat refrigerant, use only warm
(110 F/43 C) water.
DO NOT REUSE disposable (nonreturnable) cylinders
nor attempt to refill them. It is DANGEROUS AND
ILLEGAL. When cylinder is emptied, bleed off remain­
ing gas pressure, loosen the collar and unscrew and
discard the valve stem. DO NOT INCINERATE.
CHECK THE REFRIGERANT TYPE before charging
machine. High pressure refrigerant in a low pressure
machine can cause vessels to rupture if the relief devices
cannot handle the refrigerant volume.
DO NOT ATTEMPT TO REMOVE fittings, covers, etc.
while machine is under pressure or while machine is
running. Be sure pressure is at zero psig 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. Replace the valve.
DO NOT VENT refrigerant relief valves within a
building; vent to outside. The accumulation of refriger­
ant in an enclosed space can displace oxygen and cause
asphyxiation.
DO NOT install relief valves 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.
A CAUTION
DO NOT STEP on refrigerant lines. Broken lines can
whip about and cause 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 compo­
nents. Even if components are light, use such equipment
when there is a risk of slipping or losing your balance.
DO NOT WELD OR FLAME CUT any refrigerant line or
vessel untü all refrigerant has been removed from the
vessel.
BE AWARE that certain automatic start arrangements
CAN ENGAGE 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
requirements of the original equipment.
DO NOT VENT OR DRAIN water boxes containing
industrial brines, liquid, gases or semisolids without
permission of your Process Control Group.
DO NOT LOOSEN water box cover bolts until the water
box 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 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.
© Carrier Corporation 1978 Form 17DA-2SS