Operating Checks, Relief Valves; Equipment And Components Under Pressure - Carrier 19DV Series Installation, Operation And Maintenance Instructions

WARNING: 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 nitrogen and the work area should be well
ventilated. Refrigerant in contact with an open flame produces toxic gases.
Do not work on electrical components, including control panels, switches, relays etc, until you are sure all power is
off; 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 before resuming work.
WARNING: machines can be equipped with two independent power supplies to power the following equipments:
- compressor power,
- machine control, purge group and refrigerant pump, to be supplied by an uninterruptible power supply (UPS)
resulting from the installation.
Do not work on electrical components until you have disconnected each of the power supplies.
Each of the power supply is connected to the main power cabinet containing the power converter. The external
operating handle on this cabinet is intended to shut off the compressor power supply, but does not shut down the
UPS power supply: refer to the detailed wiring diagram supplied with the unit.
Beware of electrostatic discharges (static electricity) when handling or contacting circuit boards or module
connections. Always touch a portion (grounded) of the chassis to dissipate the electrostatic charge from the body
before working inside the control cabinet.
Use extreme care when handling tools near boards and when connecting or disconnecting terminal plugs. Circuit
board can easily be damaged.
This equipment uses, and can radiate, radio frequency energy. If not installed and used in accordance with the
instruction manual, it may cause interference to radio communications.
RISK OF INJURY OR DEATH by electrocution. Voltage can be present on motor leads even though the motor is
not running. Open the power supply disconnect before touching motor leads or terminals.

1.3 Operating checks, relief valves

Operating checks :
Important information regarding the refrigerant used:
Refrigerant type: HFO-R1233zd(E)
Low pressure refrigerant and non-flammable.
Global Warming Potential (GWP): 1 (very low)
Periodic inspections for refrigerant leaks may be required depending on European or local legislation. Please
contact your local dealer for more information. During the life-time of the system, inspection and tests must be
carried out in accordance with national regulations.
The information on operating inspections given in annex C of standard EN378-2 can be used if no similar criteria
exist in the national regulations.
Safety device checks (annex C6 – EN378-2): The safety devices must be checked on site once a year for safety
devices (high-pressure switches), and every five years for external overpressure devices (safety valves).
See Periodic check of the safety loop section for this safety device check procedure.
For a detailed explanation of the high pressure switch test method contact Carrier Service.
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.
Do not install safety valves in series or backwards.
Provide a drain connection in the vent line near each pressure relief device to prevent a build-up of condensate or
rain water.

1.4 Equipment and components under pressure

These products incorporate equipment or components under pressure, manufactured by Carrier or other
manufacturers. We recommend that you consult your appropriate national trade association or the owner of the
equipment or components under pressure (declaration, re-qualification, re-testing, etc.).
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