Operating instructions
15
The 19XR/19XRV machines are factory assembled, wired,
leak tested and electrically tested. Installation (not by
Carrier) consists primarily of establishing water and electrical
services to the machine. The rigging, installation, field
wiring, field piping, and insulation of waterbox covers are
the responsibilty of the contractor and/or customer.
3.2.1 - Inspect the product delivered
CAUTION: Do not open any valves or loosen any connec-
tions. The standard 19XR machine is shipped with a full
refrigerant charge. Some machines may be shipped with a
nitrogen holding charge as an option.
Inspect for shipping damage while machine is still on
shipping conveyance. If machine appears to be damaged or
has been torn loose from its anchorage, have it examined by
transportation inspectors before removal. Forward claim
papers directly to transportation company. Manufacturer
is not responsible for any damage incurred in transit.
• Confirm that the unit received is the one ordered.
Compare the name plate data with the order.
• The unit name plate must include the following
information:
1. Version number
2. Model number
3. CE marking
4. Serial number
5. Year of manufacture and test date
6. Refrigerant used and refrigerant class
7. Refrigerant charge per circuit
8. Containment fluid to be used
9. PS: Min./max. allowable pressure (high and low
pressure side)
10. TS: Min./max. allowable temperature (high and
low pressure side)
11. Globe valve cut-out pressure
12. Pressure switch cut-out pressure
13. Unit leak test pressure
14. Voltage, frequency, number of phases
15. Maximum current drawn
16. Maximum power input
17. Unit net weight
kPa -90 1250 -90 1250
°C -20 48 -20 48
kPa 1100 - - -
kPa 1250 - 1250 -
kPa 1000 - -
-
After a power cut of over three hours to the PIC control
the oil pump will be energized periodically when the power is
restored. This helps to eliminate refrigerant that has migrated
to the oil sump during the power failure. The controls will
energize the pump for 60 seconds every 30 minutes until
the chiller is started.
Oil reclaim system
The oil reclaim system returns oil lost from the compressor
housing back to the oil reservoir by recovering the oil from
two areas on the chiller. The guide vane housing is the
primary area of recovery. Oil is also recovered by skimming
it from the operating refrigerant level in the cooler vessel.
2.3.5.3 - Primary oil recovery mode
Oil is normally recovered at the guide vane housing on the
chiller, as it separates from the refrigerant forming drops
that accumulate at the bottom of the guide vane housing.
It is then returned into the oil reservoir, using a venturi.
2.3.5.4 - Secondary oil recovery method
At part-load conditions the refrigerant velocity is insufficient
for the primary mode. The oil collects in a greater concen-
tration at the cooler surface. This oil and refrigerant mixture
is skimmed in the cooler and taken from the side of the
cooler to the oil heater under the guide vanes.
Because the guide vane housing pressure is much lower than
the cooler pressure, the refrigerant evaporates, leaving the oil
behind to be collected by the primary oil recovery method.
2.3.6 - Control equipment
This is integrated in the unit-mounted cabinet. It ensures
the operation of the PIC command and mainly includes:
• the built-in control circuit transformer
• the CCM module
• the ICVC control screen
• the electrical short-circuit protections.
2.3.7 - Power circuit equipment
The standard power circuit equipment for the power supply,
protection and lubrication circuit command is integrated
in the same cabinet as the control circuit equipment. It
mainly includes:
• the pump and heater converter contactors.
• the electrical short-circuit protections.
The compressor control and protection module (ISM) is
also supplied. It controls the compressor start-up and shut-
down, as well as electric and non-electric protections:
• Current draw monitoring: overcharge, imbalance, leak
current.
• Voltage monitoring: phase order, imbalance, over/
under voltage, micro-cutouts etc.
NOTE: For low-voltage 19XR machines the compressor
control and supply are available as an option:
• Option 25a: compressor start-up via electronic starter
• Option 25b: compressor start-up via star/delta starter
with closed transition.
For 19XRV machines the power cabinet supplied as
standard for compressor control and supply is installed on
the unit. For 19XRV particulars refer to chapters 8 to 14.