Repair Safety Considerations - Carrier 19DV Series Installation, Operation And Maintenance Instructions

The characteristics of this equipment/these components are given on the nameplate or in the required
documentation, supplied with the products.

1.5 - Repair safety considerations

All installation parts must be maintained by the personnel in charge, in order to avoid material deterioration and
injuries to people. Faults and leaks must be repaired immediately. The authorized technician must have the
responsibility to repair the fault immediately. Each time repairs have been carried out to the unit, the operation of
the safety devices must be re-checked.
If a leak occurs or if the refrigerant becomes polluted remove the complete charge using a recovery unit and store
the refrigerant in mobile containers. Repair the leak detected and recharge the circuit with the total refrigerant
charge, as indicated on the unit name plate.
Do not siphon refrigerant.
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 doctor.
Never apply an open flame or live steam to a refrigerant cylinder. Dangerous overpressure can result. If it is
necessary to heat refrigerant, use only warm water (43°C).
DO NOT USE TORCH to remove any component. System contains refrigerant under pressure.
To remove a component, wear protective gloves and goggles and proceed as follows:
a. Shut off electrical power to unit.
b. Recover or isolate refrigerant from system using high-pressure and low pressure ports as appropriate.
Note that R-1233zd(E) will be less than atmospheric pressure until a temperature of about 18.5°C.
c. Traces of vapor should be displaced with nitrogen and the work area should be well ventilated. Refrigerant
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 necessary.
DANGEROUS AND ILLEGAL: Do not reuse disposable (non-returnable) cylinders or attempt to refill them. When
cylinders are emptied, evacuate remaining gas pressure, loosen the collar and unscrew and discard the valve stem.
Do not incinerate.
VERIFY that refrigerant storage cylinders are clean with no residual moisture, oil, or refrigerant that can
contaminate the refrigerant charge.
After refrigerant draining operations, check the refrigerant type before adding refrigerant to the machine. The
introduction of the wrong refrigerant can cause damage or malfunction to this machine.
Any use of these chillers with a different refrigerant must be in accordance with applicable national standards.
Do not attempt to remove connections, components etc., while the machine is under pressure or operating. Make
sure that the pressure is 0 kPa, before disconnecting the refrigerant connections.
ATTENTION: No part of the unit must be used as a walkway, rack or support.
Periodically monitor and repair or if necessary replace any component or piping that shows signs of damage.
Do not climb over a machine. Use platform, or staging.
Use mechanical equipment (crane, hoist, etc.) to lift or move heavy components. Even if components are light, use
mechanical equipment when there is a risk of slipping or losing your balance.
Do not use eyelets to lift any part of the machine or the complete machine.
ATTENTION: Be aware that certain automatic start arrangements can engage cooling tower fan or pumps.
Use only repair or replacement parts that meet the code requirements of the original equipment.
Do not vent or drain waterboxes containing industrial brines, without the permission of your process control group.
Do not loosen waterbox bolts until the waterbox has been completely drained.
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.
During refrigerant removal and storage operations follow applicable regulations. These regulations, permitting
conditioning and recovery of HFO refrigerant under optimum quality conditions for the products and optimum
safety conditions for people, property and the environment are described in standard NFE 29795.
R1233zD dissolves in some non-metallic materials, dries the skin, and in high concentrations can replace enough
oxygen to cause asphyxiation.
When handling this refrigerant, protect hands and eyes and avoid inhaling vapors.
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