Safety Considerations - Carrier 19XRV Start-Up, Operation And Maintenance Instructions Manual

1 - 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.
Be sure you understand and follow the procedures and
safety precautions contained in the machine instructions,
as well as those listed in this guide.
DANGER
DO NOT VENT refrigerant relief devices within a building.
Outlet from rupture disc or relief valve must be vented
outdoors in accordance with the applicable regulations
and codes. The accumulation of refrigerant in an enclosed
space can displace oxygen and cause asphyxiation.
PROVIDE adequate ventilation in accordance with the
applicable codes, especially for enclosed and low overhead
spaces. Inhalation of high concentrations of vapour is
harmful and may cause heart irregularities, unconscious-
ness, or death. Intentional misuse can be fatal. Vapour is
heavier than air and reduces the amount of oxygen
available for breathing. Product causes eye and skin
irritation. Decomposition products are hazardous.
DO NOT USE OXYGEN to purge lines or to pressurise 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.
RISK OF INJURY OR DEATH by electrocution. High
voltage is present on motor leads even though the motor
is not running. Open the power supply disconnect before
touching motor leads or terminals.
WARNINGS
DO NOT WELD OR FLAMECUT any refrigerant line
or vessel until all refrigerant (liquid and vapour) has
been removed from chiller. Traces of vapour 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 heat
exchangers or the entire assembly.
4
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
servicing. IF WORK IS INTERRUPTED, confirm that
all circuits are deenergised before resuming work.
AVOID SPILLING liquid refrigerant on skin or getting
it into the eyes. USE SAFETY GOGGLES AND SAFETY
GLOVES. 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 refrige-
rant cylinder. Dangerous overpressure can result. If it is
necessary to heat refrigerant, use only warm (43°C) water.
DO NOT REUSE disposable (non-returnable) 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 the applicable
codes. Contact Carrier for further information on use of
this machine with other refrigerants.
DO NOT ATTEMPT TO REMOVE fittings, covers, etc.,
while machine is under pressure or operating. Be sure
pressure is at 0 kPa before disconnecting 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 safety devices when corrosion or build-up of foreign
material (rust, dirt, scale, etc.) is found within the valve
body or mechanism. If necessary, replace the device.
The calibration of a valve that has leaked is generally
lower than its original calibration. The new calibration
may affect the operating range. To avoid a nuisance
tripping or leaks, replace or re-calibrate the valve.
Periodic check of the safety valves: See paragraph 1.3
"Maintenance safety considerations".
Provide a drain in the discharge circuit, close to each
relief valve, to avoid an accumulation of condensate or
rain water.