19XR (PIC II) Hermetic Centrifugal Liquid Chillers 50 Hz - Carrier

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 for size and
location of relief devices.
The safety valves are installed on ball valves, that are leadsealed
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 responsibility of the
user. Half the safety valves are enough to protect against fire.
The other half can be removed for replacement (see "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.
1. 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.
2. 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.
3. Piping 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.
4. 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.
5. Equip the piping with connections allowing disconnection
for the inspection of the piping.
30
Fig. 20 - Relief device locations
3.6 - Make electrical connections
Field wiring must be installed in accordance with job wiring
diagrams and all applicable electrical local regulations.
Wiring diagrams in this publication (Fig. 21-23) are for reference
only and are not intended for use during actual installation;
follow job specific wiring diagrams.
NOTE: Wires are generally of the 05VK or 07VK type, nontinned
copper core, withstanding a constant 105ºC on the core.
Cross sections are not smaller than those specified in standard
EN 60204-1.
The thicknesses and quality of the insulation are, wherever
necessary, adapted to the constraints of the placing and preparation
of the wiring, terminal spade tagging, the fitting of
specific connectors, etc.
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.
The wires are marked all along their length, one mark approx.
every 40 mm, according to an equipotential system. The reference
mark numbers are those of the Carrier wiring diagram.
The wires are attached by a clip around the components and
are routed in a self-extinguishing PVC chute! The connectors
terminate the bus strand in conformity with Carrier drawings.
CAUTION: Do not run low voltage wiring into the control
cabinet. The control cabinet should only be used for
additional extra-low voltage wiring (50 V maximum).
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
Wiring may be specified for a spare safety switch, and a
remote start/stop contact can be wired to the starter terminal
strip. Additional spare sensors and Carrier Comfort Network
modules may be specified as well. These are wired to the
machine control panel as indicated in Fig. 21.
3.6.1 Installation standards and precautions
The units have just one power connection point.
The starter cabinet (optional) includes:
the starting-up equipment (standard)
the motor protection (standard)
the Integrated Starter Module ISM
the Chiller Control Module CCM
the Chiller Visual Control CVC