Operating instructions
27
3.5.2 - Install vent piping to relief devices
The 19XR chiller is factory equipped with relief devices on
the cooler and condenser shells. Refer to Fig. 20 - “Relief
device locations” for size and location of relief devices.
The safety valves are installed on ball valves, that are
lead-sealed in the open position. These valves permit
isolating and removing the safety valve for calibration and
replacement.
If a safety valve is replaced, do not leave the machine
without safety valves. Only remove the safety valve, if the
risk of fire is completely controlled and under the responsi-
bility of the user. Only one safety valve at a time must be
removed and replaced so that fire protection is maintained
during this operation. Please refer to chapter 1 - “Safety
considerations”.
Vent relief devices to the outdoors in accordance with the
applicable national standard (for example, NFE 35400 in
France and EN 378 when applicable) for the safety of
chilling devices as well as any other applicable codes.
DANGER: Refrigerant discharged into confined spaces
can displace oxygen and cause asphyxiation.
• If relief devices are manifolded, the cross-sectional
area of the relief pipe must at least equal the sum of
the areas required for individual relief pipes.
• Provide a pipe plug near outlet side of each relief
device for leak testing. Provide pipe fittings that allow
vent piping to be disconnected periodically for
inspection of valve mechanism.
• Piping connected to relief devices must not apply
stress to the device. Adequately support piping. A
length of flexible tubing or piping near the device is
essential on spring-isolated machines.
• Cover the outdoor vent with a rain cap and place a
condensation drain at the low point in the vent piping
to prevent water build-up on the atmospheric side of
the relief device.
• Equip the piping with connections to allow discon-
nection of the piping for inspection.
The wiring diagrams in this manual (see Fig. 24 - “COMM 1
CCN communication wiring for multiple chillers”) are only
for illustration and should not be used instead of the
project-specific wiring diagrams.
Details for the wires and cables inside the factory-mounted
control boxes: Except for the compressor power supply
cables, the insulation is generally of the 05VK or 07VK type.
The wire colours are generally as follows: red, black and
white for the 3 bus wires, red for all the common 24, 115,
230 VAC wires, orange for all the wires of the excluded
circuits, blue for the DC circuits, brown for all the other
wires.
WARNING: Do not attempt to start compressor or oil
pump (even for a rotation check) or apply test voltage of
any kind while machine is under dehydration vacuum.
Motor insulation breakdown and serious damage may
result.
Connect control inputs. For details about the remote control
wiring refer to the chapter for the relevant starter type
used.
3.6.1 - Installation standards and precautions
The field wiring must comply with all relevant electrical
regulations that apply at the installation site (see "Electrical
data notes"). In France, for example, the requirements of
standard NFC 15100, among others, must be met.
IMPORTANT: If particular aspects of an installation
require different characteristics from those listed above
(or not mentioned), contact your local Carrier office.
3.6.2 - Electrical characteristics of the motors
NOTE: For 60 Hz units contact Carrier.
The installer is responsible for the installation arrangement
of the machine power supply.
This must be defined using the data supplied on the
specific machine selection sheet.
Motor LRDA* Motor OLTA*
Motor LRYA* Motor OLTA*
3*Motor RLA* Motor OLTA*
N/A Chiller rated line current*
* Value given on the specic machine selection sheet.
** The maximum start-up current duration is less than 10 s.
The installation data must comply with any other short-circuit requirements
supplied for the machine.
1. Nominal current draw of the oil pump =
power kVA x 1000/(√3 x voltage).
2. The crankcase heater only operates when the compressor is o.
3. Power to the crankcase heater control must be on circuits that can provide
continuous service when the compressor is disconnected.